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This work investigates the possibility of applying two types of oxidized multiwalled carbon nanotubes (oxMWCNTs) as effective adsorbents for removing low concentrations of Cd(II) and Pb(II) (≤ 5 mg L-1) from aqueous media, as well as the influence of the functionalization process duration (3 h (oxMWCNT3h) or 6 h (oxMWCNT6h)) on the performance of the materials tested. Both oxMWCNTs were thoroughly characterized by SEM/EDS, TEM, FTIR, N2 adsorption/desorption and pHpzc techniques. An extensive study of Cd(II) and Pb(II) adsorption and the mechanisms responsible was conducted by evaluating the effects of contact time, initial Cd(II) and Pb(II) concentration, pH and ionic strength. Adsorption kinetic data show that the two materials can be considered extremely effective, as less than 20 min was required to reach a state of equilibrium. Freundlich, Langmuir, Dubinin-Radushkevic and Temkin adsorption isotherm models fit the data well and suggest that the investigated adsorption processes are favourable, mainly electrostatically driven and exothermic. The maximum adsorption capacities obtained by the Langmuir model were 10.5 and 13.5 mg g-1 for Cd(II) and 23.4 and 27.9 mg g -1 for Pb(II) (thus: oxMWCNT6h > oxMWCNT3h and Pb(II) > Cd(II)). The adsorption of Cd(II) and Pb(II) is strongly and positively influenced by increasing the pH and negatively affected by increasing the ionic strength of the solutions. In general, the obtained results are very promising, with the application of oxMWCNTs proving effective for the purification of aqueous media contaminated with low concentrations of Cd(II) and Pb(II), regardless of the duration of the functionalization process.
Marko Šolić; Snežana Maletić; Marijana Kragulj Isakovski; Jasmina Nikić; Malcolm Watson; Zoltan Kónya; Srđan Rončević. Removing low levels of Cd(II) and Pb(II) by adsorption on two types of oxidized multiwalled carbon nanotubes. Journal of Environmental Chemical Engineering 2021, 9, 105402 .
AMA StyleMarko Šolić, Snežana Maletić, Marijana Kragulj Isakovski, Jasmina Nikić, Malcolm Watson, Zoltan Kónya, Srđan Rončević. Removing low levels of Cd(II) and Pb(II) by adsorption on two types of oxidized multiwalled carbon nanotubes. Journal of Environmental Chemical Engineering. 2021; 9 (4):105402.
Chicago/Turabian StyleMarko Šolić; Snežana Maletić; Marijana Kragulj Isakovski; Jasmina Nikić; Malcolm Watson; Zoltan Kónya; Srđan Rončević. 2021. "Removing low levels of Cd(II) and Pb(II) by adsorption on two types of oxidized multiwalled carbon nanotubes." Journal of Environmental Chemical Engineering 9, no. 4: 105402.
In this study, graphite-like biochars were successively prepared by pyrolyzing modified newspaper and maize straw with ball-milling and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)- mediated oxidation at a pyrolysis temperature of 900 °C and their physico-chemical properties and adsorption performances towards imidacloprid (IMI) and sulfadiazine (SUL) in aqueous solution were all explored. The results showed that the successive modification by ball-milling and TEMPO-mediated oxidation completely open the fibers of the newspaper and porous stereoscopic structures of the maize straw. The obtained graphite-like biochars contained planar structures and abundant O-containing functional groups, and exhibited a great degree of graphitization and specific surface areas reaching up to 871.5 and 1065 m2/g, making them super adsorbents. Furthermore, hydrophobic partitioning provided a limited contribution to the sorption on biochars for IMI and SUL as revealed by dual-mode model fitting. The graphite-like biochars adsorbed IMI and SUL, mainly through pore-filling, H-bonding, cation/p/π-π EDA interactions, and electrostatic interactions and cation-π EDA interactions further enhanced the sorption of cationic IMI. Additionally, the adsorption efficiency of biochars pretreated with ball-milling and TEMPO-mediated oxidation for IMI and SUL was>85%, even after five consecutive recycling process. Thus, this study provides excellent graphite-like biochar adsorbents pretreated with a combined ball-milling and oxidation modification method, making them efficient for removing hydrophilic pesticides and antibiotics from polluted water.
Peng Zhang; Xinhua Wang; Bing Xue; Yueli Hao; Jingchun Tang; Snežana P. Maletić; Srđan D. Rončević; Hongwen Sun. Preparation of graphite-like biochars derived from straw and newspaper based on ball-milling and TEMPO-mediated oxidation and their supersorption performances to imidacloprid and sulfadiazine. Chemical Engineering Journal 2021, 411, 128502 .
AMA StylePeng Zhang, Xinhua Wang, Bing Xue, Yueli Hao, Jingchun Tang, Snežana P. Maletić, Srđan D. Rončević, Hongwen Sun. Preparation of graphite-like biochars derived from straw and newspaper based on ball-milling and TEMPO-mediated oxidation and their supersorption performances to imidacloprid and sulfadiazine. Chemical Engineering Journal. 2021; 411 ():128502.
Chicago/Turabian StylePeng Zhang; Xinhua Wang; Bing Xue; Yueli Hao; Jingchun Tang; Snežana P. Maletić; Srđan D. Rončević; Hongwen Sun. 2021. "Preparation of graphite-like biochars derived from straw and newspaper based on ball-milling and TEMPO-mediated oxidation and their supersorption performances to imidacloprid and sulfadiazine." Chemical Engineering Journal 411, no. : 128502.
The purpose of the current study is to compare the influence of different aerobic conditions (biostimulation (BS), bioaugmentation (BA), and a combination of biostimulation and bioaugmentation (BB)) on polycyclic aromatic hydrocarbons (PAH) degradation and compare the degraded amount with single step XAD-4 extraction as a new tool for bioavailability assessment for chronically contaminated sediment samples obtained from territory of Autonomous Province Vojvodina of Serbia (S1, S2, and S3). A great number of papers dealing with biodegradation of PAHs in spiked sediment or soil have been published, but to the authors’ knowledge, a limited number of papers studied aged, historically polluted sediment and a sum of chosen U.S. Environmental Protection Agency (USEPA) PAHs. A significant reduction (up to 67%) in PAH concentration was observed, while the percentage of reduction varied depending on the sediment sample and treatment used. BS treatment successfully stimulated growth of indigenous bacteria. Further, PAH-degrading strain Sphingomonas paucimobilis F8 inoculated in BA and BB treatment survived for up to 7 weeks after it was suppressed by unfavorable conditions or native microbes. Degraded amounts generally showed good correlation with results obtained from XAD-4 extraction. Results obtained in the current study represent a good start for standardizing a XAD-4 extraction technique as a simplified, easier, and lower cost method for bioavailability assessment.
Snežana Maletić; Jelena Beljin; Dragana Tamindžija; Marko Grgić; Jelena Molnar Jazić; Marijana Kragulj Isakovski; Srđan Rončević. Bioremediation perspective of historically contaminated sediment with polycyclic aromatic hydrocarbons. International Journal of Sediment Research 2020, 36, 479 -488.
AMA StyleSnežana Maletić, Jelena Beljin, Dragana Tamindžija, Marko Grgić, Jelena Molnar Jazić, Marijana Kragulj Isakovski, Srđan Rončević. Bioremediation perspective of historically contaminated sediment with polycyclic aromatic hydrocarbons. International Journal of Sediment Research. 2020; 36 (4):479-488.
Chicago/Turabian StyleSnežana Maletić; Jelena Beljin; Dragana Tamindžija; Marko Grgić; Jelena Molnar Jazić; Marijana Kragulj Isakovski; Srđan Rončević. 2020. "Bioremediation perspective of historically contaminated sediment with polycyclic aromatic hydrocarbons." International Journal of Sediment Research 36, no. 4: 479-488.
The application of three simple and cost-effective technologies for ex situ remediation of the sediment of Begej River in Serbia is presented in this paper. In the first step, conventional electrokinetic treatment (EK) was carried out to reduce the amount of contaminated sediment and enhance the accumulation of metals. Subsequently, stabilization/solidification (S/S) treatment was applied to the remaining portion of polluted sediment to immobilize the accumulated metals. At the same time, the influence of accelerated carbonation on the effectiveness of the treatment was evaluated. The immobilizing agents used in this study included bio ash produced by combustion of wheat and soy straw mixture and bio ash derived from molasses incineration. After the treatments, the risk assessment was performed by using the sequential extraction procedure (SEP) and TCLP and DIN 3841-4 S4 leaching tests. The results obtained after the EK treatment revealed a reduction in the amount of polluted sediment to a half. Leaching tests and SEP performed on S/S mixtures after a 28-day maturation period indicated that accelerated carbonation decreased the mobility of critical metals, especially in wheat and soy straw mixtures. Moreover, based on the leaching tests, all prepared mixtures were categorized as non-hazardous and safe for disposal according to the relevant Serbian regulations. The newly developed method that combines EK and S/S treatments with the addition of accelerated carbonation produced reduced volumes of stabilized sediment which is safe for disposal.
Nenad Popov; Srđan Rončević; Nataša Duduković; Dejan Krčmar; Željko Mihaljev; Milica Živkov Baloš; Stefan Đorđievski. Ex situ remediation of sediment from Serbia using a combination of electrokinetic and stabilization/solidification with accelerated carbonation treatments. Environmental Science and Pollution Research 2020, 28, 14969 -14982.
AMA StyleNenad Popov, Srđan Rončević, Nataša Duduković, Dejan Krčmar, Željko Mihaljev, Milica Živkov Baloš, Stefan Đorđievski. Ex situ remediation of sediment from Serbia using a combination of electrokinetic and stabilization/solidification with accelerated carbonation treatments. Environmental Science and Pollution Research. 2020; 28 (12):14969-14982.
Chicago/Turabian StyleNenad Popov; Srđan Rončević; Nataša Duduković; Dejan Krčmar; Željko Mihaljev; Milica Živkov Baloš; Stefan Đorđievski. 2020. "Ex situ remediation of sediment from Serbia using a combination of electrokinetic and stabilization/solidification with accelerated carbonation treatments." Environmental Science and Pollution Research 28, no. 12: 14969-14982.
Paper deals with seasonal changes in heavy metal bioaccumulation (Fe, Mn, Cu, Zn and Pb) in Utricularia vulgaris L. and Salvinia natans (L.) All. of two localities (Necik and Sinjak – active fishpond basins) in the area of Bardača fishpond. According to our results, the better accumulator of Fe (3035 mg/kg) and Zn was S. natans (163.55 mg/kg), whereas Utricularia vulgaris better accumulates Mn (620 mg/kg) and Cu (10.18 mg/kg). Amounts of Pb in both investigated macrophyte were below the detection level (1 or ~1 for both species, and the BAC values decreased in the following order in both investigated species: Fe > Mn > Cu > Zn. The results obtained indicated that tested macrophyte show very good characteristics as bioaccumulators and, thanks to this fact, they could be used in phytoremediation technique successfully in water-polluted ecosystem.
Tanja Maksimović; Srđan Rončević; Biljana Kukavica. Utricularia vulgaris L. and Salvinia natans (L.) All. heavy metal (Fe, Mn, Cu, Zn and Pb) bioaccumulation specificity in the area of Bardača fishpond. Ekológia (Bratislava) 2019, 38, 201 -213.
AMA StyleTanja Maksimović, Srđan Rončević, Biljana Kukavica. Utricularia vulgaris L. and Salvinia natans (L.) All. heavy metal (Fe, Mn, Cu, Zn and Pb) bioaccumulation specificity in the area of Bardača fishpond. Ekológia (Bratislava). 2019; 38 (3):201-213.
Chicago/Turabian StyleTanja Maksimović; Srđan Rončević; Biljana Kukavica. 2019. "Utricularia vulgaris L. and Salvinia natans (L.) All. heavy metal (Fe, Mn, Cu, Zn and Pb) bioaccumulation specificity in the area of Bardača fishpond." Ekológia (Bratislava) 38, no. 3: 201-213.
The objective of this study is to enable a better understanding of the effectiveness of solidification/stabilization (S/S) technique in treating polluted sediment, and provide the much needed validation of the longevity of the technology. In this research kaolinite and montmorillonite, with a certain proportion of lime, were used for S/S treatment of sediment polluted with metals. Leachability of metals was examined using the toxicity characteristic leaching procedure (TCLP) and the German standard leaching test (DIN 3841-4 S4) prescribed in national legislative. Results indicated successful S/S treatment using both clays and lime, from the aspect of all leached metals even with pH variations over time and slight changes in structural integrity of specimens. X-ray diffraction (XRD), scanning electron microscope (SEM) analyses and porosity measurement were also performed on the prepared monolithic matrices. XRD qualitative and semi-quantitative analysis proved hydration and pozzolanic product formation with increase in their content and finer crystallites formation over time. SEM analysis confirmed the presence of morphologically dense and stable structures while pore size distribution indicated on mesoporous matrices with ongoing compaction over time. Generally, structural microanalysis indicated the formation of hardened matrices over time and hydration process has been fully completed and further carbonation took place. Unconfined compressive strength measurement gave the satisfying results and matured monolite with 30 % of montmorillonite and 10 % of lime can be considered potentially applicable as non-load-bearing material. In summary, all results indicated that this kind of S/S treatment can achieve satisfactory durability and represent reliable and economically feasible technique for long-term remediation of metal polluted sediment.
Djurdja Kerkez; Dunja Radjenović; Dragana Tomašević Pilipović; Milena Bečelić-Tomin; Nataša Slijepčević; Srđan Rončević; Božo Dalmacija. Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance. Periodica Polytechnica Chemical Engineering 2019, 64, 93 -105.
AMA StyleDjurdja Kerkez, Dunja Radjenović, Dragana Tomašević Pilipović, Milena Bečelić-Tomin, Nataša Slijepčević, Srđan Rončević, Božo Dalmacija. Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance. Periodica Polytechnica Chemical Engineering. 2019; 64 (1):93-105.
Chicago/Turabian StyleDjurdja Kerkez; Dunja Radjenović; Dragana Tomašević Pilipović; Milena Bečelić-Tomin; Nataša Slijepčević; Srđan Rončević; Božo Dalmacija. 2019. "Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance." Periodica Polytechnica Chemical Engineering 64, no. 1: 93-105.
Phytotechnologies have been used worldwide to remediate and restore damaged ecosystems, especially those caused by industrial byproducts leaching into rivers and other waterways. The objective of this study was to test the growth, physiology, and phytoextraction potential of poplar and willow established in soils amended with heavy-metal contaminated, dredged river sediments from the Great Bačka Canal near Vrbas City, Serbia. The sediments were applied to greenhouse-grown trees of Populus deltoides Bartr. ex Marsh. clone ‘Bora’ and Salix viminalis L. clone ‘SV068’. Individual pots with trees previously grown for two months were amended with 0, 0.5 and 1.0 kg of sediment containing 400 mg Cr kg−1, 295 mg Cu kg−1, 465 mg Zn kg−1, 124 mg Ni kg−1, 1.87 mg Cd kg−1, and 61 mg Pb kg−1. Following amendment, trees were grown for two seasons (i.e., 2014, 2015), with coppicing after the first season. In addition to growth parameters, physiological traits related to the photosynthesis and nitrogen metabolism were assessed during both growing seasons. At the end of the study, trees were harvested for biomass analysis and accumulation of heavy metals in tree tissues and soils. Application of sediment decreased aboveground biomass by 37.3% in 2014, but increased height (16.4%) and leaf area (19.2%) in 2015. Sediment application negatively impacted the content of pigments and nitrate reductase activity, causing them to decrease over time. Generally, the effect of treatments on growth was more pronounced in poplars, while willows had more pronounced physiological activity. Accumulation patterns were similar to previously-published results. In particular, Zn and Cd were mostly accumulated in leaves of both poplar and willow, which indicated successful phytoextraction. In contrast, other metals (e.g., Cr, Ni, Pb, Cu) were mostly phytostabilized in the roots. Differences in metal allocation between poplar and willow were recorded only for Cu, while other metals followed similar distribution patterns in both genera. Results of this study indicated that the composition of heavy metals in the sediments determined the mechanisms of the applied phytoremediation technique.
Andrej Pilipović; Ronald S. Zalesny; Srđan Rončević; Nataša Nikolić; Saša Orlović; Jelena Beljin; Marina Katanić. Growth, physiology, and phytoextraction potential of poplar and willow established in soils amended with heavy-metal contaminated, dredged river sediments. Journal of Environmental Management 2019, 239, 352 -365.
AMA StyleAndrej Pilipović, Ronald S. Zalesny, Srđan Rončević, Nataša Nikolić, Saša Orlović, Jelena Beljin, Marina Katanić. Growth, physiology, and phytoextraction potential of poplar and willow established in soils amended with heavy-metal contaminated, dredged river sediments. Journal of Environmental Management. 2019; 239 ():352-365.
Chicago/Turabian StyleAndrej Pilipović; Ronald S. Zalesny; Srđan Rončević; Nataša Nikolić; Saša Orlović; Jelena Beljin; Marina Katanić. 2019. "Growth, physiology, and phytoextraction potential of poplar and willow established in soils amended with heavy-metal contaminated, dredged river sediments." Journal of Environmental Management 239, no. : 352-365.
Sediment represents a sink for toxic and persistent chemicals such as hexachlorobenzene (HCB) and lindane (γ-HCH). This paper investigates the possibility of reducing the risks associated with the presence of these pollutants in sediments by amending the sediment with carbon-rich materials (activated carbon (AC) and humus (HC)) to sequester the contaminants and render them biologically unavailable. The effects of the dose and contact time between the sediment and the carbon-rich amendments on the effectiveness of the detoxification are estimated. Four doses of carbon-rich amendments (0.5–10%) and four equilibration contact times (14–180 days) were investigated. Results have shown that the bioavailable fraction of γ-HCH and HCB decreased significantly in comparison to the unamended sediment. Regarding the AC amendments, almost 100% for both compounds; and for HC amendments around 95% for γ-HCH, and 75% for HCB. Aging caused further reductions in the bioavailable fraction, compared to the untreated sediment. Phytotoxicity tests showed that Zea mays accumulated significantly higher amount of γ-HCH and HCB from unamended sediment, comparing to Cucurbita pepo and Lactuca sativa. Toxicity of HC and AC amended sediment assessed by Vibrio fischeri luminescence inhibition test and by measuring Zea mays germination and biomass yield was significantly reduced in the amended sediment samples. γ-HCH and HCB accumulation in the Zea mays biomass in the unamended sediment were a significantly higher than in the all HC and AC amended sediment. Both sorbents show potential to be used as remediation agents for organically contaminated sediment, but AC exhibited the better performance.
Marko Grgić; Snežana Maletić; Jelena Beljin; Marijana Kragulj Isakovski; Srđan Rončević; Aleksandra Tubić; Jasmina Agbaba. Lindane and hexachlorobenzene sequestration and detoxification in contaminated sediment amended with carbon-rich sorbents. Chemosphere 2019, 220, 1033 -1040.
AMA StyleMarko Grgić, Snežana Maletić, Jelena Beljin, Marijana Kragulj Isakovski, Srđan Rončević, Aleksandra Tubić, Jasmina Agbaba. Lindane and hexachlorobenzene sequestration and detoxification in contaminated sediment amended with carbon-rich sorbents. Chemosphere. 2019; 220 ():1033-1040.
Chicago/Turabian StyleMarko Grgić; Snežana Maletić; Jelena Beljin; Marijana Kragulj Isakovski; Srđan Rončević; Aleksandra Tubić; Jasmina Agbaba. 2019. "Lindane and hexachlorobenzene sequestration and detoxification in contaminated sediment amended with carbon-rich sorbents." Chemosphere 220, no. : 1033-1040.
Paper monitors seasonal dynamics of heavy metals bioaccumulation (Fe, Mn, Cu, Zn and Pb) of emerged plant Phragmites australis (Cav.) Trin. ex Steud. on two localities (Necik and Sinjak) in the area of Bardača fishpond (BiH-Republic of Srpska). Dynamics of heavy metals bioaccumulation varied depending on sampling period, locality and plant organ. Concentration, transfer (transport) and accumulation of metals from sediment to rhizome above ground plant part was evaluated based on biological concentration factor (BCF), translocation ability (TA) and bioaccumulation factor (BAC). The highest average BCF value in researched species was determined for Fe (0.87) and the lowest for Zn (0.18). Bioaccumulation coefficient was the highest for Mn (0.82) and the lowest for Fe (0.20) whereas TA was the highest for Zn (2.28) and Mn (2.70). For Fe, it was significantly lower (0.24). Based on values for BCF, TA and BAC, Phragmites australis (Cav.) Trin. ex Steud. could be identified as accumulator for Mn and indicator for metals Fe, Zn and Cu and it has good potential for application in phytoremediation techniques, especially in phytostabilization and phytoextraction of polluted land. Considering the fact that higher degree of bioaccumulation was recorded in the period at the end of season, we could take this period as a signal for their removal from water ecosystems.
Tanja Maksimović; Srđan Rončević; Biljana Kukavica. Seasonal dynamics of heavy metal bioaccumulation (Fe, Mn, Cu, Zn and Pb) in Phragmites australis (Cav.) Trin. ex Steud. in Bardača fishpond. Kragujevac Journal of Science 2019, 169 -180.
AMA StyleTanja Maksimović, Srđan Rončević, Biljana Kukavica. Seasonal dynamics of heavy metal bioaccumulation (Fe, Mn, Cu, Zn and Pb) in Phragmites australis (Cav.) Trin. ex Steud. in Bardača fishpond. Kragujevac Journal of Science. 2019; (41):169-180.
Chicago/Turabian StyleTanja Maksimović; Srđan Rončević; Biljana Kukavica. 2019. "Seasonal dynamics of heavy metal bioaccumulation (Fe, Mn, Cu, Zn and Pb) in Phragmites australis (Cav.) Trin. ex Steud. in Bardača fishpond." Kragujevac Journal of Science , no. 41: 169-180.
Bismuth-oxychloride-multiwalled carbon nanotube composite material was applied as surface modifier of glassy carbon electrode (BiOCl-MWCNT/GCE) for rapid and reliable trace level determination of Zn(II) in selected foodstuffs. The method development encompasses the optimization of electrode preparation including the transmission electron microscopic study of the modifier suspension, selection of the supporting electrolyte pH, the adjustment of the operation parameters of the SW-ASV measurements and the investigation of matrix effects. The BiOCl-MWCNT/GCE showed an excellent linear response towards Zn reoxidation peak maxima in the concentration range from 2.50 to 80.0 μg L−1 with the calculated LOD of 0.75 μg L−1 which was associated with 120 s accumulation time and accumulation potential −1.40 V vs SCE in acetate buffer pH 4.5. A satisfactory repeatability expressed as relative standard deviation of 4.8% was obtained in the case of 10.0 μg L−1 Zn(II) in model solution. The Zn(II) reoxidation signal from BiOCl-MWCNT/GCE received by the optimized SW-ASV method was compared with those recorded with bare, classical bismuth-film, multiwalled carbon nanotubes and by in situ made advanced bismuth-film-MWCNTs working electrodes. The applicability of the proposed BiOCl-MWCNT/GCE based method was corroborated via measuring the target analyte in two nutrition related real samples: in a dietary supplement and in a brewer's yeast sample. Comparative flame atomic absorption spectrometric measurements verified the obtained results in the case of yeast sample.
Sandra Petrović; Valéria Guzsvány; Nikola Ranković; Jelena Beljin; Srđan Rončević; Božo Dalmacija; Amir M. Ashrafi; Zoltán Kónya; Ivan Švancara; Karel Vytřas. Trace level voltammetric determination of Zn(II) in selected nutrition related samples by bismuth-oxychloride-multiwalled carbon nanotube composite based electrode. Microchemical Journal 2018, 146, 178 -186.
AMA StyleSandra Petrović, Valéria Guzsvány, Nikola Ranković, Jelena Beljin, Srđan Rončević, Božo Dalmacija, Amir M. Ashrafi, Zoltán Kónya, Ivan Švancara, Karel Vytřas. Trace level voltammetric determination of Zn(II) in selected nutrition related samples by bismuth-oxychloride-multiwalled carbon nanotube composite based electrode. Microchemical Journal. 2018; 146 ():178-186.
Chicago/Turabian StyleSandra Petrović; Valéria Guzsvány; Nikola Ranković; Jelena Beljin; Srđan Rončević; Božo Dalmacija; Amir M. Ashrafi; Zoltán Kónya; Ivan Švancara; Karel Vytřas. 2018. "Trace level voltammetric determination of Zn(II) in selected nutrition related samples by bismuth-oxychloride-multiwalled carbon nanotube composite based electrode." Microchemical Journal 146, no. : 178-186.
Due to the anaerobic nature of aquatic sediments, the anaerobic treatment of sediments utilizing already present microflora represents an interesting treatment option. Contaminated sediment can contain a variety of organic contaminants, with easily degradable organics usually present in the higher amounts, along with traces of specific organic pollutants (total petroleum hydrocarbons and polycyclic aromatic hydrocarbons). This study applies a comprehensive approach to contaminated sediment treatment which covers all the organic contaminants present in the sediment. The aim of this study was to (1) evaluate the anaerobic treatment of aquatic sediment highly loaded with easily degradable organics via determination of potential biogas and methane production, and (2) assess possibilities of using anaerobic treatment for the degradation of specific organic pollutants in order to reduce the risks posed by the sediment. In order to promote the methanogenic conditions of the indigenous microflora in the sediment, the addition of co-substrates acetate and glucose was investigated. The results, expressed as mL biogas produced per volatile solids content in sediment (VS) indicate that the addition of the co-substrate has a significant impact on biogas production potential (58.7 and 55.1 mL/g VS for acetate and glucose co-substrate addition respectively, and 14.6 mL/g VS for the treatment without co-substrate addition). Theoretical biochemical methane potential was assessed by Gompertz model and Chemical oxygen demand model. The Gompertz model fit better for all the applied treatments, and was capable of predicting the final productivity of biogas and methane in the first 30 days with a relative error of less than 14%. From the aspects of specific organic pollutants, total petroleum hydrocarbon degradation was promoted by co-substrate addition (degradations of 75% and 60% achieved by acetate and glucose co-substrate addition, compared to 45% for the treatment without co-substrate addition). Polycyclic aromatic hydrocarbons were reduced by significant amounts (84-87%) in all the applied treatments, but the addition of co-substrate did not further improve their degradation.
Snežana Maletić; Stela Murenji; Jasmina Agbaba; Srđan Rončević; Marijana Kragulj Isakovski; Jelena Molnar Jazić; Božo Dalmacija. Potential for anaerobic treatment of polluted sediment. Journal of Environmental Management 2018, 214, 9 -16.
AMA StyleSnežana Maletić, Stela Murenji, Jasmina Agbaba, Srđan Rončević, Marijana Kragulj Isakovski, Jelena Molnar Jazić, Božo Dalmacija. Potential for anaerobic treatment of polluted sediment. Journal of Environmental Management. 2018; 214 ():9-16.
Chicago/Turabian StyleSnežana Maletić; Stela Murenji; Jasmina Agbaba; Srđan Rončević; Marijana Kragulj Isakovski; Jelena Molnar Jazić; Božo Dalmacija. 2018. "Potential for anaerobic treatment of polluted sediment." Journal of Environmental Management 214, no. : 9-16.
In this study, laboratory scale experiments were conducted with the horizontal continuous-flow EC reactor as a standalone technology with the capacity of 300 L/day with iron (Fe) plate bipolar electrodes to assess its efficiency in the removal of arsenic from raw groundwater without pre- and post-treatment pH modification of groundwater.The optimum EC reactor operating conditions were determined to be current density of 1.98 A/m2, charge loading of 52C/L, flow rate of 12 L/h. The EC reactor was able to remove 96% of arsenic from raw groundwater and met respective World Health Organization (WHO) guideline value of 10 μg As/L within the 4 hour experimental runs. The Fe electrode polarity change at 30 minutes successfully controlled passivation of Fe electrodes and enabled a steady reactor operation with the high As removal efficiency. Residual Fe concentration in treated groundwater was in the range 0.17 ± 0.07 mg/L and met WHO guideline value for drinking water. The preliminary estimated operating cost at the optimum operating conditions was 0.0135 €/m3.
Emilijan Mohora; Srdjan Rončević; Jasmina Agbaba; Kristiana Zrnić; Aleksandra Tubić; Božo Dalmacija. Arsenic removal from groundwater by horizontal-flow continuous electrocoagulation (EC) as a standalone process. Journal of Environmental Chemical Engineering 2018, 6, 512 -519.
AMA StyleEmilijan Mohora, Srdjan Rončević, Jasmina Agbaba, Kristiana Zrnić, Aleksandra Tubić, Božo Dalmacija. Arsenic removal from groundwater by horizontal-flow continuous electrocoagulation (EC) as a standalone process. Journal of Environmental Chemical Engineering. 2018; 6 (1):512-519.
Chicago/Turabian StyleEmilijan Mohora; Srdjan Rončević; Jasmina Agbaba; Kristiana Zrnić; Aleksandra Tubić; Božo Dalmacija. 2018. "Arsenic removal from groundwater by horizontal-flow continuous electrocoagulation (EC) as a standalone process." Journal of Environmental Chemical Engineering 6, no. 1: 512-519.
Predmet istraživanja ovog rada bio je ispitivanje adsorpcionog ponašanja odabranih dvovalentnih metala (Cu(II), Cd(II), Pb(II)) na amino-funkcionalizovanim višeslojnim ugljeničnim nanocevima, MWCNT-NH2, na četiri odabrane pH vrednosti (3; 4,5; 6 i 11), a u cilju ispitivanja mogućnosti primene MWCNT-NH2 za uklanjanje jona metala iz vodenih rastvora u oblasti relativno niskih koncentracija (0,01-0,1 mg L-1). Fokus rada je bio na utvrđivanju mehanizma procesa adsorpcije u ispitivanim uslovima. Adsorpciju jona dvovalentnih metala na MWCNT-NH2 najbolje je opisao reakcioni model pseudo-drugog reda što znači da adsorpcija može biti pripisana uspostavljanju hemijskih interakcija između adsorbata i vezivnih grupa na površini adsorbenta. Modelovanje brzine Weber Morris-ovim difuzionim modelom ukazalo je na to da unutarčestična difuzija, iako sporiji korak od eksterne difuzije, nije jedini ograničavajući korak u procesu adsorpcije, već su za to odgovorne i interakcije ispitivanih jona sa vezivnim mestima na površini adsorbenta. Procena uticaja pH vrednosti na brzinu procesa pokazala je da pH vrednost, u ispitivanom opsegu, ima najveći uticaj na efikasnost adsorpcije Cu(II), a najmanji na uklanjanje Cd(II). nanomaterijali; dvovalentni metali; adsorpcija; kinetika
Tamara Apostolović; Jelena Tričković; Aleksandra Šućurović; Marijana Kragulj-Isakovski; Snežana Maletić; Srđan Rončević; Božo Dalmacija. Adsorption kinetics of divalent metals on amino-functionalized carbon nanomaterial. Zastita materijala 2018, 59, 216 -225.
AMA StyleTamara Apostolović, Jelena Tričković, Aleksandra Šućurović, Marijana Kragulj-Isakovski, Snežana Maletić, Srđan Rončević, Božo Dalmacija. Adsorption kinetics of divalent metals on amino-functionalized carbon nanomaterial. Zastita materijala. 2018; 59 (2):216-225.
Chicago/Turabian StyleTamara Apostolović; Jelena Tričković; Aleksandra Šućurović; Marijana Kragulj-Isakovski; Snežana Maletić; Srđan Rončević; Božo Dalmacija. 2018. "Adsorption kinetics of divalent metals on amino-functionalized carbon nanomaterial." Zastita materijala 59, no. 2: 216-225.
Evaluation of the bioavailable fractions of organic contaminants such as polycyclic aromatic hydrocarbons (PAHs) is extremely important for assessing their risk to the environment. This available fraction, which can be solubilised and/or easily extracted, is believed to be the most accessible for bioaccumulation, biosorption and/or transformation. Sediment organic matter (OM) and clay play an important role in the biodegradation and bioavailability of PAHs. The strong association of PAHs with OM and clay in sediments has a great influence not only on their distribution but also on their long-term environmental impact. This paper investigates correlations between bioavailability and the clay and OM contents in sediments. The results show that OM is a better sorbent for pyrene (chosen as a model PAH) and that increasing the OM content reduces the bioavailable fraction. A mathematical model was used to predict the kinetic desorption, and these results showed that the sediment with the lowest content of OM had an Ffast value of 24%, whereas sediment with 20% OM gave a value of 9%. In the experiments with sediments with different clay contents, no clear dependence between clay and rate constants of the fast desorbing fractions was observed, which can be explained by the numerous possible interactions at the molecular level.
Jelena Spasojević; Snežana Maletić; Srđan Rončević; Marko Grgić; Dejan Krčmar; Nataša Varga; Božo Dalmacija. The role of organic matter and clay content in sediments for bioavailability of pyrene. Water Science and Technology 2017, 77, 439 -447.
AMA StyleJelena Spasojević, Snežana Maletić, Srđan Rončević, Marko Grgić, Dejan Krčmar, Nataša Varga, Božo Dalmacija. The role of organic matter and clay content in sediments for bioavailability of pyrene. Water Science and Technology. 2017; 77 (2):439-447.
Chicago/Turabian StyleJelena Spasojević; Snežana Maletić; Srđan Rončević; Marko Grgić; Dejan Krčmar; Nataša Varga; Božo Dalmacija. 2017. "The role of organic matter and clay content in sediments for bioavailability of pyrene." Water Science and Technology 77, no. 2: 439-447.
The aim of this study was to obtain a complete picture of the geochemical character of the sediment in the eastern Posavina region, Serbia, an area which has thus far not been systematically investigated. Geological mapping and impact assessment were thus carried out for this area. Sediments were sampled (from 0 to 0.5 m depth) in four locations in eastern Posavina between 2002 and 2014. Eight heavy metals (Ni, Zn, Cd, Cr, Cu, Pb, As and Hg) and a wide variety of organic parameters (16 EPA polycyclic aromatic hydrocarbons (PAHs), mineral oils, selected pesticides and polychlorinated biphenyls (PCBs)) were monitored. Metals were analysed by flame and graphite atomic absorption spectrometry, and gas chromatography with mass detection was used for the PAH analyses. The origins of the monitored substances were classified using geoaccumulation index (Igeo), ecological risk index (RI) and principal component analysis (PCA/FA). The sediments all contained higher heavy metals concentrations than the upper continental crust (UCC), suggesting dynamic natural and anthropogenic processes in this unique region. Significant variations (RSD values from 13 to 190) were observed for Cd (0.001–80.00 mg kg−1), Hg (0.01–5.40 mg kg−1), mineral oil (2.00–1851 mg kg−1) and the sum of 16 EPA PAHs (0.003–5.57 mg kg−1). The Igeo index classified the pollution risk due to Cr as strong, Cd, Zn and Hg as moderate to strong and Ni as moderate. Based on PCA/FA analysis, the parameters were grouped somewhat differently, with anthropogenic activity found to be responsible for much of the Hg, Cd and Cr pollution present in the sediments. The analysis revealed eight heavy metals (Ni, Zn, Cd, Cr, Cu, Pb, As and Hg), the sum of 16 EPA PAHs and mineral oil as parameters of great interest for this unique region. These parameters must be the focus of future monitoring programs, in support of appropriate remediation techniques and/or dredging activities, which are required in order to comply with the new Serbian regulations and the relevant EU recommendations.
Nenad Grba; Dejan Krčmar; Franz Neubauer; Srđan Rončević; Marijana Kragulj Isakovski; Jelena Molnar Jazic; Božo Dalmacija. Geochemical monitoring of organic and inorganic pollutants in the sediment of the Eastern Posavina (Serbia). Journal of Soils and Sediments 2017, 17, 2610 -2619.
AMA StyleNenad Grba, Dejan Krčmar, Franz Neubauer, Srđan Rončević, Marijana Kragulj Isakovski, Jelena Molnar Jazic, Božo Dalmacija. Geochemical monitoring of organic and inorganic pollutants in the sediment of the Eastern Posavina (Serbia). Journal of Soils and Sediments. 2017; 17 (11):2610-2619.
Chicago/Turabian StyleNenad Grba; Dejan Krčmar; Franz Neubauer; Srđan Rončević; Marijana Kragulj Isakovski; Jelena Molnar Jazic; Božo Dalmacija. 2017. "Geochemical monitoring of organic and inorganic pollutants in the sediment of the Eastern Posavina (Serbia)." Journal of Soils and Sediments 17, no. 11: 2610-2619.
This work investigates the sorption behaviour of six hydrophobic organic compounds (HOCs) from the trichlorobenzenes (TCBs) and polycyclic aromatic hydrocarbons (PAHs) on Danube sediment using batch and column experiments, either in the presence or absence of carbon nanotubes (CNTs). For all HOCs investigated, nonlinear isotherms were obtained. Based on logKoc, it can be concluded that the Danube sediment has a higher sorption affinity for PAHs than TCBs. A positive correlation between HOC molecular hydrophobicity and sorption affinity was obtained, meaning that hydrophobic interactions play a significant role. There was a negative correlation between molecular hydrophobicity and the percentage of eluted HOCs, indicating that more hydrophobic molecules show less mobility in the sediment column. In the presence of CNTs in the sediment column, HOC concentrations in the column eluate decreased by factors of 2–3. Metal oxides and hydroxides on the surface of the sediment under the given experimental conditions had positively charged centres that caused the deposition of CNTs, leading to simultaneous sorption of organic compounds on both sediment organic matter (SOM) and CNTs. The increased retention of HOCs in the presence of CNTs on the sediment column reduces their mobility, which might also suggest that CNTs may be used for remediation of contaminated soils and sediments.
Jelena Tričković; Marijana Kragulj Isakovski; Malcolm Watson; Snežana Maletić; Srđan Rončević; Božo Dalmacija; Zoltán Kónya; Ákos Kukovecz. Sorption Behaviour of Trichlorobenzenes and Polycyclic Aromatic Hydrocarbons in the Absence or Presence of Carbon Nanotubes in the Aquatic Environment. Water, Air, & Soil Pollution 2016, 227, 374 .
AMA StyleJelena Tričković, Marijana Kragulj Isakovski, Malcolm Watson, Snežana Maletić, Srđan Rončević, Božo Dalmacija, Zoltán Kónya, Ákos Kukovecz. Sorption Behaviour of Trichlorobenzenes and Polycyclic Aromatic Hydrocarbons in the Absence or Presence of Carbon Nanotubes in the Aquatic Environment. Water, Air, & Soil Pollution. 2016; 227 (10):374.
Chicago/Turabian StyleJelena Tričković; Marijana Kragulj Isakovski; Malcolm Watson; Snežana Maletić; Srđan Rončević; Božo Dalmacija; Zoltán Kónya; Ákos Kukovecz. 2016. "Sorption Behaviour of Trichlorobenzenes and Polycyclic Aromatic Hydrocarbons in the Absence or Presence of Carbon Nanotubes in the Aquatic Environment." Water, Air, & Soil Pollution 227, no. 10: 374.
Large amounts of sediment are dredged globally every year. This sediment is often contaminated with low concentrations of metals, polycyclic aromatic hydrocarbons, pesticides and other organic pollutants. Some of this sediment is disposed of on land, creating a need for risk assessment of the sediment disposal method, to minimize the degradation of environmental quality and prevent risks to human health. Evaluating the available fractions of certain polycyclic aromatic hydrocarbons is very important, as in the presence of various organisms, they are believed to be easily subject to the processes of bioaccumulation, biosorption and transformation. In order to determine the applicability of applying these methods for the evaluation of pollutant bioavailability in sediments, the desorption kinetics from the sediment of various polycyclic aromatic hydrocarbons in the presence of Tenax and XAD4 were examined over the course of 216 h. Changes in the PAH concentrations in dredged sediments using five different seed plants during a short time of period (10 days) were also followed. Using chemical extraction techniques with Tenax and XAD4, a time of around 24 h is enough to achieve equilibrium for all four PAHs. Results showed good agreement between the seed accumulation and PAH extraction methods with both agents. If we compare the two extraction techniques, XAD4 gave better results for phenanthrene, pyrene and benzo(a)pyrene, and Tenax gave better results for chrysene.
Srđan Rončević; Jelena Spasojević; Snezana Maletic; Jelena Molnar Jazić; Marijana Kragulj Isakovski; Jasmina Agbaba; Marko Grgić; Božo Dalmacija. Assessment of the bioavailability and phytotoxicity of sediment spiked with polycyclic aromatic hydrocarbons. Environmental Science and Pollution Research 2015, 23, 3239 -3246.
AMA StyleSrđan Rončević, Jelena Spasojević, Snezana Maletic, Jelena Molnar Jazić, Marijana Kragulj Isakovski, Jasmina Agbaba, Marko Grgić, Božo Dalmacija. Assessment of the bioavailability and phytotoxicity of sediment spiked with polycyclic aromatic hydrocarbons. Environmental Science and Pollution Research. 2015; 23 (4):3239-3246.
Chicago/Turabian StyleSrđan Rončević; Jelena Spasojević; Snezana Maletic; Jelena Molnar Jazić; Marijana Kragulj Isakovski; Jasmina Agbaba; Marko Grgić; Božo Dalmacija. 2015. "Assessment of the bioavailability and phytotoxicity of sediment spiked with polycyclic aromatic hydrocarbons." Environmental Science and Pollution Research 23, no. 4: 3239-3246.
This work studies the adsorption of four chlorinated phenols (2,4-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,5-tetrachlorophenol and pentachlorophenol) in aqueous solutions on multiwalled carbon nanotubes (MWCNT).
Marijana Kragulj; Jelena Trickovic; Akos Kukovecz; Branislav Jović; Jelena Molnar; Srđan Rončević; Zoltan Konya; Božo Dalmacija. Adsorption of chlorinated phenols on multiwalled carbon nanotubes. RSC Advances 2015, 5, 24920 -24929.
AMA StyleMarijana Kragulj, Jelena Trickovic, Akos Kukovecz, Branislav Jović, Jelena Molnar, Srđan Rončević, Zoltan Konya, Božo Dalmacija. Adsorption of chlorinated phenols on multiwalled carbon nanotubes. RSC Advances. 2015; 5 (32):24920-24929.
Chicago/Turabian StyleMarijana Kragulj; Jelena Trickovic; Akos Kukovecz; Branislav Jović; Jelena Molnar; Srđan Rončević; Zoltan Konya; Božo Dalmacija. 2015. "Adsorption of chlorinated phenols on multiwalled carbon nanotubes." RSC Advances 5, no. 32: 24920-24929.
Two multiwalled carbon nanotubes-based composites modified with bismuth and bismuth-oxychloride particles were synthesized and attached to the glassy carbon electrode substrate. The resultant configurations, Bi/MWCNT-GCE and BiOCl/MWNT-GCE, were then characterized with respect to their physicochemical properties and electroanalytical performance in combination with square-wave anodic stripping voltammetry (SWASV). Further, some key experimental conditions and instrumental parameters were optimized; namely: the supporting electrolyte composition, accumulation potential and time, together with the parameters of the SWV-ramp. The respective method with both electrode configurations has then been examined for the trace level determination of Pb(2+) and Cd(2+) ions and the results compared to those obtained with classical bismuth-film modified GCE. The different intensities of analytical signals obtained at the three electrodes for Pb(2+) and Cd(2+) vs. the saturated calomel reference electrode had indicated that the nature of the modifiers and the choice of the supporting electrolyte influenced significantly the corresponding stripping signals. The most promising procedure involved the BiOCl/MWCNT-GCE and the acetate buffer (pH 4.0) offering limits of determination of 4.0 μg L(-1) Cd(2+) and 1.9 μg L(-1) Pb(2+) when accumulating for 120 s at a potential of -1.20 V vs. ref. The BiOCl/MWCNT electrode was tested for the determination of target ions in the pore water of a selected sediment sample and the results agreed well with those obtained by graphite furnace atomic absorption spectrometry.
Sandra Cerovac; Valéria Guzsvány; Zoltán Kónya; Amir M. Ashrafi; Ivan Švancara; Srđan Rončević; Ákos Kukovecz; Božo Dalmacija; Karel Vytřas. Trace level voltammetric determination of lead and cadmium in sediment pore water by a bismuth-oxychloride particle-multiwalled carbon nanotube composite modified glassy carbon electrode. Talanta 2015, 134, 640 -649.
AMA StyleSandra Cerovac, Valéria Guzsvány, Zoltán Kónya, Amir M. Ashrafi, Ivan Švancara, Srđan Rončević, Ákos Kukovecz, Božo Dalmacija, Karel Vytřas. Trace level voltammetric determination of lead and cadmium in sediment pore water by a bismuth-oxychloride particle-multiwalled carbon nanotube composite modified glassy carbon electrode. Talanta. 2015; 134 ():640-649.
Chicago/Turabian StyleSandra Cerovac; Valéria Guzsvány; Zoltán Kónya; Amir M. Ashrafi; Ivan Švancara; Srđan Rončević; Ákos Kukovecz; Božo Dalmacija; Karel Vytřas. 2015. "Trace level voltammetric determination of lead and cadmium in sediment pore water by a bismuth-oxychloride particle-multiwalled carbon nanotube composite modified glassy carbon electrode." Talanta 134, no. : 640-649.
The main goal of this study was to investigate the effects of ozone oxidation pretreatment and powdered activated carbon (PAC) addition on the efficacy of natural organic matter (NOM) removal by coagulation. Relatively high iron chloride doses from 100 to 200 mg FeCl3/L were applied, due to the high dissolved organic carbon (DOC) content (10.27 ± 0.49 mg C/L) of the raw water investigated, with PAC used in doses of 5–30 mg/L. Preozonation was carried out at doses of 0.2–1.3 mg O3/mg DOC. Jar test results indicate that baseline coagulation with the optimal coagulant dose (200 mg FeCl3/L) achieved was 39% DOC and 54% UV254 removals. PAC addition improves coagulation efficacy in NOM removal by up to 9% DOC and 25% UV254. The best results were obtained in combination with 0.6 mg O3/mg DOC, 5 mg/L PAC and 200 mg FeCl3/L (removals of 58% DOC and 72% UV254), and were a significant improvement compared to coagulation alone.
Jasmina Agbaba; Aleksandra Tubić; Božo Dalmacija; Malcolm Watson; Jelena Molnar; Srđan Rončević; Snezana Maletic. Investigation of the impact of ozone pretreatment and powdered activated carbon addition on the removal of natural organic matter by coagulation. Desalination and Water Treatment 2014, 56, 912 -920.
AMA StyleJasmina Agbaba, Aleksandra Tubić, Božo Dalmacija, Malcolm Watson, Jelena Molnar, Srđan Rončević, Snezana Maletic. Investigation of the impact of ozone pretreatment and powdered activated carbon addition on the removal of natural organic matter by coagulation. Desalination and Water Treatment. 2014; 56 (4):912-920.
Chicago/Turabian StyleJasmina Agbaba; Aleksandra Tubić; Božo Dalmacija; Malcolm Watson; Jelena Molnar; Srđan Rončević; Snezana Maletic. 2014. "Investigation of the impact of ozone pretreatment and powdered activated carbon addition on the removal of natural organic matter by coagulation." Desalination and Water Treatment 56, no. 4: 912-920.