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Engineered nanoparticles (ENPs) present in consumer products are being released into the agricultural systems. There is little information about the direct effect of ENPs on phosphorus (P) availability, which is an essential nutrient for crop growth naturally occurring in agricultural soils. The present study examined the effect of 1, 3, and 5% doses of Cu0 or Ag0 ENPs stabilized with L-ascorbic acid (suspension pH 2–3) on P ad- and desorption in an agricultural Andisol with total organic matter (T-OM) and with partial removal of organic matter (R-OM) by performing batch experiments. Our results showed that the adsorption kinetics data of H2PO4 − on T-OM and R-OM soil samples with and without ENPs were adequately described by the pseudo-second-order (PSO) and Elovich models. The adsorption isotherm data of H2PO4 − from T-OM and R-OM soil samples following ENPs addition were better fitted by the Langmuir model than the Freundlich model. When the Cu0 or Ag0 ENPs doses were increased, the pH value decreased and H2PO4 − adsorption increased on T-OM and R-OM. The H2PO4 − desorption (%) was lower with Cu0 ENPs than Ag0 ENPs. Overall, the incorporation of ENPs into Andisols generated an increase in P retention, which may affect agricultural crop production.
Jonathan Suazo-Hernández; Erwin Klumpp; Nicolás Arancibia-Miranda; Patricia Poblete-Grant; Alejandra Jara; Roland Bol; María De La Luz Mora. Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles. Minerals 2021, 11, 373 .
AMA StyleJonathan Suazo-Hernández, Erwin Klumpp, Nicolás Arancibia-Miranda, Patricia Poblete-Grant, Alejandra Jara, Roland Bol, María De La Luz Mora. Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles. Minerals. 2021; 11 (4):373.
Chicago/Turabian StyleJonathan Suazo-Hernández; Erwin Klumpp; Nicolás Arancibia-Miranda; Patricia Poblete-Grant; Alejandra Jara; Roland Bol; María De La Luz Mora. 2021. "Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles." Minerals 11, no. 4: 373.
Nanoscale zero-valent iron (NZVI) and NZVI supported onto montmorillonite (NZVI-Mt) were synthetized and used in this study to remove SeVI and AsV from water in mono- and binary-adsorbate systems. The adsorption kinetics and isotherm data for SeVI and AsV were adequately described by the pseudo-second-order (PSO) (r2>0.94) and Freundlich (r2>0.93) equations. Results from scanning electron microscopy showed that the dimension of the NZVI immobilized on the Mt was smaller than pure NZVI. Using 0.05 g of adsorbent and an initial 200 mg L−1 AsV and SeVI concentration, the maximum adsorption capacity (qmax) and partition coefficient (PC) for AsV on NZVI-Mt in monocomponent system were 54.75 mg g-1 and 0.065 mg g-1·µM-1, which dropped respectively to 49.91 mg g-1 and 0.055 mg g-1·µM-1 under competitive system. For SeVI adsorption on NZVI-Mt in monocomponent system, qmax and PC were 28.63 mg g-1 and 0.024 mg g-1·µM-1, respectively. Values of qmax and PC were higher for NZVI-Mt than NZVI and montmorillonite, indicating that the nanocomposite contained greater adsorption sites for removing both oxyanions, but with a marked preference for AsV. Future research should evaluate the effect of different operational variables on the removal efficiency of both oxyanions by NZVI-Mt.
Jonathan Suazo-Hernández; Karen Manquián-Cerda; María De La Luz Mora; Mauricio Molina-Roco; María Angélica Rubio; Binoy Sarkar; Nanthi Bolan; Nicolás Arancibia-Miranda. Efficient and selective removal of SeVI and AsV mixed contaminants from aqueous media by montmorillonite-nanoscale zero valent iron nanocomposite. Journal of Hazardous Materials 2020, 403, 123639 .
AMA StyleJonathan Suazo-Hernández, Karen Manquián-Cerda, María De La Luz Mora, Mauricio Molina-Roco, María Angélica Rubio, Binoy Sarkar, Nanthi Bolan, Nicolás Arancibia-Miranda. Efficient and selective removal of SeVI and AsV mixed contaminants from aqueous media by montmorillonite-nanoscale zero valent iron nanocomposite. Journal of Hazardous Materials. 2020; 403 ():123639.
Chicago/Turabian StyleJonathan Suazo-Hernández; Karen Manquián-Cerda; María De La Luz Mora; Mauricio Molina-Roco; María Angélica Rubio; Binoy Sarkar; Nanthi Bolan; Nicolás Arancibia-Miranda. 2020. "Efficient and selective removal of SeVI and AsV mixed contaminants from aqueous media by montmorillonite-nanoscale zero valent iron nanocomposite." Journal of Hazardous Materials 403, no. : 123639.
Imogolite and magnetic imogolite-Fe oxide nanocomposites (Imo-Fe50 and Imo-Fe25, at 50 and 25 % Fe loading (w/w), respectively) were synthesized and tested for the removal of aqueous copper (Cu), cadmium (Cd), and arsenic (As) pollutants. The materials were characterized by transmission electron microscopy, and specific surface area and isoelectric point measurements. The Fe-containing samples were additionally characterized by Mössbauer spectroscopy and vibrating-sample magnetometry. Significant differences were found in the morphological, electrophoretic, and magnetic characteristics between imogolite and the nanocomposites. The in-situ Fe-oxide precipitation process modified the active surface sites of the imogolite. The Fe–oxide, mainly magnetite, favored the contaminants’ adsorption over the pristine imogolite. The adsorption kinetics of these pollutants were adequately described by the pseudo-second order and intraparticle diffusion models. The kinetic models showed that surface adsorption was more important than intraparticle diffusion in the removal of the pollutants by all the adsorbents. The Langmuir-Freundlich model described the experimental adsorption data, and both nanocomposites showed greater adsorption capacity than the imogolite. The adsorption of Cu and Cd was sensitive to cationic competition, showing a decrease of the adsorption capacity when the two cations coexisted, while their adsorption increased in the presence of arsenate.
Nicolás Arancibia-Miranda; Karen Manquián-Cerda; Carmen Pizarro; Tamara Maldonado; Jonathan Marcelo Suazo Hernandez; Mauricio Escudey; Nanthi Bolan; Binoy Sarkar. Mechanistic insights into simultaneous removal of copper, cadmium and arsenic from water by iron oxide-functionalized magnetic imogolite nanocomposites. Journal of Hazardous Materials 2020, 398, 122940 .
AMA StyleNicolás Arancibia-Miranda, Karen Manquián-Cerda, Carmen Pizarro, Tamara Maldonado, Jonathan Marcelo Suazo Hernandez, Mauricio Escudey, Nanthi Bolan, Binoy Sarkar. Mechanistic insights into simultaneous removal of copper, cadmium and arsenic from water by iron oxide-functionalized magnetic imogolite nanocomposites. Journal of Hazardous Materials. 2020; 398 ():122940.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Karen Manquián-Cerda; Carmen Pizarro; Tamara Maldonado; Jonathan Marcelo Suazo Hernandez; Mauricio Escudey; Nanthi Bolan; Binoy Sarkar. 2020. "Mechanistic insights into simultaneous removal of copper, cadmium and arsenic from water by iron oxide-functionalized magnetic imogolite nanocomposites." Journal of Hazardous Materials 398, no. : 122940.
Heterogeneous electro-Fenton (HEF) is as an alternative to the conventional electro-Fenton (EF) process. HEF uses a solid phase catalyst, whereas EF employs a solubilized one. This implies that in HEF, material can be recovered through a simple separation process such as filtration or magnetic separation in HEF. HEF also has the advantage of not requires a previous pH adjustment, which facilitates working in a higher pH range. In this work, Fe, Cu and Fe/Cu bimetallic nanoparticles (Fe/Cu NPs) were synthesized, characterized and used for the degradation of Nafcillin (NAF). The effect of the adsorption and the anodic oxidation (AO-H2O2) process was tested to assess their influence on HEF. NAF adsorption did not exceed 24% of antibiotic removal and the AO-H2O2 process eliminated the total NAF after 240 min of electrolysis. Through the HEF process, the antibiotic was completely removed using Fe/Cu NPs after 7.0 min of electrolysis, while these NPs, mineralization reached 41% after 240 min. In this case, NAF degradation occurs mainly due to the generation of hydroxyl radicals in the BDD electrode, and the Fenton reaction with Fe and Cu NPs. The main organic intermediates produced during the degradation of NAF by HEF were identified allowing the proposal of degradation pathway. Finally, the antibiotic was also completely eliminated from a wastewater from slaughterhouse after 15 min of treatment by HEF and using Fe/Cu bimetallic NPs.
Sebastian Campos; Ricardo Salazar; Nicolás Arancibia-Miranda; M.A. Rubio; Mario Aranda; Alejandra Garcia; Pamela Sepúlveda; L. Carolina Espinoza. Nafcillin degradation by heterogeneous electro-Fenton process using Fe, Cu and Fe/Cu nanoparticles. Chemosphere 2020, 247, 125813 .
AMA StyleSebastian Campos, Ricardo Salazar, Nicolás Arancibia-Miranda, M.A. Rubio, Mario Aranda, Alejandra Garcia, Pamela Sepúlveda, L. Carolina Espinoza. Nafcillin degradation by heterogeneous electro-Fenton process using Fe, Cu and Fe/Cu nanoparticles. Chemosphere. 2020; 247 ():125813.
Chicago/Turabian StyleSebastian Campos; Ricardo Salazar; Nicolás Arancibia-Miranda; M.A. Rubio; Mario Aranda; Alejandra Garcia; Pamela Sepúlveda; L. Carolina Espinoza. 2020. "Nafcillin degradation by heterogeneous electro-Fenton process using Fe, Cu and Fe/Cu nanoparticles." Chemosphere 247, no. : 125813.
Imogolite is a nanotubular aluminosilicate that has low toxicity in biological systems and due to its morphological and surface properties has a growing interest in environmental applications and biomedical areas. Its synthesis is highly sensitive to the presence of other ions, being able to inhibit or retard the process of imogolite formation, which could change the cytotoxic response of this substrate, something scarcely reported in the literature. In this context, the presence of arsenite during the synthesis of imogolite caused significant changes in the dimensions and surface behavior of these nanotubes. Cell viability was evaluated on EA.hy926 and HepG2 cells by (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide) assay at 24 h. Meanwhile, the potential effects on human red blood cells, namely, hemolysis and morphological changes, were determined at 0 and 24 h. The range of % As tested of the nanotube showed cell toxicity similar to the control condition. Similarly, the As-based nanotubes induced hemolysis similar to controls and slight morphological changes of red blood cells at 0 and 24 h of exposition. These results indicate that As-based imogolite-like nanotubes are not toxic nor hemolytic and can be potentially used in processes like water purification.
Edgardo Rojas-Mancilla; Alexis Oyarce; Leonor Alvarado-Soto; César Echeverría; Karen Manquián-Cerda; Nicolás Arancibia-Miranda; Rodrigo Ramírez-Tagle. Imogolite Synthetized in Presence of As(III) Induces Low Cell Toxicity and Hemolysis, in Vitro, Potential Stabilization of Arsenite Present in Aqueous Systems. ACS Omega 2019, 4, 10510 -10515.
AMA StyleEdgardo Rojas-Mancilla, Alexis Oyarce, Leonor Alvarado-Soto, César Echeverría, Karen Manquián-Cerda, Nicolás Arancibia-Miranda, Rodrigo Ramírez-Tagle. Imogolite Synthetized in Presence of As(III) Induces Low Cell Toxicity and Hemolysis, in Vitro, Potential Stabilization of Arsenite Present in Aqueous Systems. ACS Omega. 2019; 4 (6):10510-10515.
Chicago/Turabian StyleEdgardo Rojas-Mancilla; Alexis Oyarce; Leonor Alvarado-Soto; César Echeverría; Karen Manquián-Cerda; Nicolás Arancibia-Miranda; Rodrigo Ramírez-Tagle. 2019. "Imogolite Synthetized in Presence of As(III) Induces Low Cell Toxicity and Hemolysis, in Vitro, Potential Stabilization of Arsenite Present in Aqueous Systems." ACS Omega 4, no. 6: 10510-10515.
We studied the sorption of As(V) in single and multi-component (As(V)-Se(VI)) aqueous systems using nanoscale zero-valent iron (nZVI) and nZVI-functionalized zeolite (Z-nZVI) adsorbents. Morphological and physico-chemical characterization of the adsorbents was conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area and electrophoretic mobility measurements. SEM and XRD analyses showed that Fe-nanoparticle size and crystallinity were better preserved in Z-nZVI than nZVI after As(V) sorption. Highly efficient As(V) removal was achieved for all tested adsorbents with a minimal competition effect of Se(VI). In the single-component system, the equilibrium As(V) sorption time on nZVI and Z-nZVI was 40 and 60 min, respectively, while in the multi-component system, this time was 90 min for both the adsorbents. The Freundlich and pseudo-second-order models provided good fittings for the experimental sorption data (r2>0.96). The As(V) removal capacity was higher using Z-nZVI than nZVI both in the single and multi-component systems, suffering minimal differences in removal in both cases. The results suggested that Z-nZVI had more specific surface sites for As(V) than nZVI and zeolite, which makes Z-nZVI a more effective adsorbent than nZVI for the removal of As(V) from aqueous solutions in the presence of other oxyanions.
Jonathan Suazo-Hernández; Pamela Sepúlveda; Karen Manquián-Cerda; Rodrigo Ramírez-Tagle; María Angélica Rubio; Nanthi Bolan; Binoy Sarkar; Nicolás Arancibia-Miranda. Synthesis and characterization of zeolite-based composites functionalized with nanoscale zero-valent iron for removing arsenic in the presence of selenium from water. Journal of Hazardous Materials 2019, 373, 810 -819.
AMA StyleJonathan Suazo-Hernández, Pamela Sepúlveda, Karen Manquián-Cerda, Rodrigo Ramírez-Tagle, María Angélica Rubio, Nanthi Bolan, Binoy Sarkar, Nicolás Arancibia-Miranda. Synthesis and characterization of zeolite-based composites functionalized with nanoscale zero-valent iron for removing arsenic in the presence of selenium from water. Journal of Hazardous Materials. 2019; 373 ():810-819.
Chicago/Turabian StyleJonathan Suazo-Hernández; Pamela Sepúlveda; Karen Manquián-Cerda; Rodrigo Ramírez-Tagle; María Angélica Rubio; Nanthi Bolan; Binoy Sarkar; Nicolás Arancibia-Miranda. 2019. "Synthesis and characterization of zeolite-based composites functionalized with nanoscale zero-valent iron for removing arsenic in the presence of selenium from water." Journal of Hazardous Materials 373, no. : 810-819.
The frequent use of phosphorus (P) fertilisers accompanied by nitrogen and potassium sources may lead to a serious long-term environmental issue because of the presence of potentially hazardous trace metals (TM) in P fertilisers and unknown effects on the TM chemical fractions in agricultural soils. A 16-month-long column experiment was conducted to investigate the mobility and chemical forms of Cd, Cu, Cr, Ni, and Zn introduced into a Mollisol and an Andisol through surface incorporation (0–2 cm) of triple superphosphate (TSP) fertiliser. The effects of urea and potassium chloride (KCl) applications were investigated as well. After 15 cycles of 300-mm irrigation, TSP addition increased the 4 M HNO3 extractable TM concentration in the upper (0–5 cm) section of soils. Beyond this depth, metals showed no significant mobility, with minimal leaching losses (< 1.9%, 25-cm depth). The TM chemical forms in the 0–5 cm section were significantly (p < 0.01) affected by the soil type and fertilisers addition. Cadmium, Ni, and Zn were the elements which appeared in a larger proportion (up to 30%) in the most labile fraction (KNO3 extractable) in fertilised soils. The impact of urea depended on the nitrification-related changes in soil pH, while fertilisation with KCl tended to increase the KNO3 fraction of most metals probably due to K+ exchange reactions. Chromium remained minimally affected by the urea and KCl applications since this contaminant is strongly bound to the less labile solid phases. The low mobility of TM was governed mainly by their interaction with the solid phases rather than by their speciation at soil pH. The mass balance showed that the geochemical processes underwent in time by the P fertiliser increased the amount of TM extracted by the chemical fractionation scheme, therefore the reaction period of TSP with soil particles should be taken into account for evaluating TM availability. Long-term soil fertilisation could inadvertently contribute to an increased concentration and availability of these P fertilisers-born contaminants in the cultivated layer of acidic soils.
Mauricio Molina-Roco; Mauricio Escudey; Mónica Antilén-Lizana; Nicolás Arancibia-Miranda; Karen Manquián-Cerda. Distribution of contaminant trace metals inadvertently provided by phosphorus fertilisers: movement, chemical fractions and mass balances in contrasting acidic soils. Environmental Geochemistry and Health 2018, 40, 2491 -2509.
AMA StyleMauricio Molina-Roco, Mauricio Escudey, Mónica Antilén-Lizana, Nicolás Arancibia-Miranda, Karen Manquián-Cerda. Distribution of contaminant trace metals inadvertently provided by phosphorus fertilisers: movement, chemical fractions and mass balances in contrasting acidic soils. Environmental Geochemistry and Health. 2018; 40 (6):2491-2509.
Chicago/Turabian StyleMauricio Molina-Roco; Mauricio Escudey; Mónica Antilén-Lizana; Nicolás Arancibia-Miranda; Karen Manquián-Cerda. 2018. "Distribution of contaminant trace metals inadvertently provided by phosphorus fertilisers: movement, chemical fractions and mass balances in contrasting acidic soils." Environmental Geochemistry and Health 40, no. 6: 2491-2509.
In this study, bimetallic nanoparticles (BMNPs) with different mass ratios of Cu and Fe were evaluated. The influence of the morphology on the removal of pollutants was explored through theoretical and experimental studies, which revealed the best structure for removing arsenate (As(V)) in aqueous systems. To evidence the surface characteristics and differences among BMNPs with different mass proportions of Fe and Cu, several characterization techniques were used. Microscopy techniques and molecular dynamics simulations were applied to determine the differences in morphology and structure. In addition, X-ray diffraction (XRD) was used to determine the presence of various oxides. Finally, the magnetization response was evaluated, revealing differences among the materials. Our cumulative data show that BMNPs with low amounts of Cu (Fe0.9Cu0.1) had a non-uniform core-shell structure with agglomerate-type chains of magnetite, whereas a Janus-like structure was observed in BMNPs with high amounts of Cu (Fe0.5Cu0.5). However, a non-uniform core-shell structure (Fe0.9Cu0.1) facilitated electron transfer among Fe, Cu and As, which increased the adsorption rate (k), capacity (qe) and intensity (n). The mechanism of As removal was also explored in a comparative study of the phase and morphology of BMNPs pre- and post-sorption.
Pamela Sepúlveda; María A. Rubio; Samuel Baltazar; Javier Rojas-Nunez; Jose Luis Sanchez Llamazares; Alejandra Garcia; Nicolás Arancibia-Miranda. As(V) removal capacity of FeCu bimetallic nanoparticles in aqueous solutions: The influence of Cu content and morphologic changes in bimetallic nanoparticles. Journal of Colloid and Interface Science 2018, 524, 177 -187.
AMA StylePamela Sepúlveda, María A. Rubio, Samuel Baltazar, Javier Rojas-Nunez, Jose Luis Sanchez Llamazares, Alejandra Garcia, Nicolás Arancibia-Miranda. As(V) removal capacity of FeCu bimetallic nanoparticles in aqueous solutions: The influence of Cu content and morphologic changes in bimetallic nanoparticles. Journal of Colloid and Interface Science. 2018; 524 ():177-187.
Chicago/Turabian StylePamela Sepúlveda; María A. Rubio; Samuel Baltazar; Javier Rojas-Nunez; Jose Luis Sanchez Llamazares; Alejandra Garcia; Nicolás Arancibia-Miranda. 2018. "As(V) removal capacity of FeCu bimetallic nanoparticles in aqueous solutions: The influence of Cu content and morphologic changes in bimetallic nanoparticles." Journal of Colloid and Interface Science 524, no. : 177-187.
Bimetallic nanoparticles can be tailored by varying the concentration of their constituent elements, resulting in novel structures and/or configurations, leading to interesting electronic, mechanical and chemical properties. In this paper, by means of molecular dynamics calculations, we study the morphology of bimetallic FeCu nanoparticles as a function of Cu concentration. Our results evidence a Core-Shell structure for low Cu concentrations, and a Janus-like morphology for high Cu content. Structural and energy characterizations were performed to determine the atomic-scale behavior of the nanoparticles. Using a continuous model to describe immiscible components, we obtain a stability transition curve between core-shell and Janus-like structures for several nanoparticle sizes and concentrations. Results from both methods are compared with experimental data obtained for nanoparticles with low and high Cu content, evidencing a good agreement among the three approaches.
Javier Rojas-Nunez; Rafael I. I. Gonzalez; Eduardo Bringa; Sebastian Allende; Pamela Sepúlveda; Nicolás Arancibia-Miranda; Samuel E. Baltazar. Toward Controlled Morphology of FeCu Nanoparticles: Cu Concentration and Size Effects. The Journal of Physical Chemistry C 2018, 122, 8528 -8534.
AMA StyleJavier Rojas-Nunez, Rafael I. I. Gonzalez, Eduardo Bringa, Sebastian Allende, Pamela Sepúlveda, Nicolás Arancibia-Miranda, Samuel E. Baltazar. Toward Controlled Morphology of FeCu Nanoparticles: Cu Concentration and Size Effects. The Journal of Physical Chemistry C. 2018; 122 (15):8528-8534.
Chicago/Turabian StyleJavier Rojas-Nunez; Rafael I. I. Gonzalez; Eduardo Bringa; Sebastian Allende; Pamela Sepúlveda; Nicolás Arancibia-Miranda; Samuel E. Baltazar. 2018. "Toward Controlled Morphology of FeCu Nanoparticles: Cu Concentration and Size Effects." The Journal of Physical Chemistry C 122, no. 15: 8528-8534.
The application of iron nanoparticles (FeNPs) to the removal of various pollutants has received wide attention over the last few decades. A synthesis alternative to obtain these nanoparticles without using harmful chemical reagents, such as NaBH, is the use of extracts from different natural sources that allow a lesser degree of agglomeration, in a process known as green synthesis. In this study, FeNPs were synthesized by 'green' (hereafter, BB-Fe NPs) and 'chemical' (hereafter, nZVI) methods. Extracts of leaves and blueberry shoots (Vaccinium corymbosum) were used as reducing agents for FeCl·6HO solution in the green synthesis method. FeNPs were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), electrophoretic migration, Brunauer-Emmett-Teller (BET) surface area analysis and X-ray diffraction (XRD) and evaluated for the removal of As(V) from aqueous systems. In both synthesis methods, XRD analysis confirmed the presence of the different kinds of iron nanoparticles. SEM analysis showed that the average size of BB-Fe NPs was 52.4nm and that a variety of nanoparticles of different forms and associated structures, such as lepidocrocite, magnetite, and nZVI, were present, while the dimensions of nZVI were 80.2nm. Comparatively significant differences regarding the electrophoretic mobility were found between both materials pre- and post-sorption of As(V). The velocity of As(V) removal by BB-Fe NPs was slower than that by nZVI, reaching equilibrium at 120min compared to 60min for nZVI. The removal kinetics of As(V) were adequately described by the pseudo-second-order kinetic model, and the maximum adsorbed amounts of this analyte are in close accordance with the experimental results. The Langmuir-Freundlich model is in good agreement with our experimental data, where the sorption capacity of nZVI and BB-Fe NPs was found to be 52.23 ± 6.06 and 50.40 ± 5.90 (mg·g), respectively. The use of leaves of Vaccinium corymbosum affords an easy-to-synthesize, low-cost, and eco-friendly material with capabilities similar to nZVI. BB-Fe NPs are promising for arsenic remediation, which has emerged as a new alternative for water purification and sanitation.
Karen Manquián-Cerda; Edgardo Cruces; María Angélica Rubio; Camila Reyes; Nicolás Arancibia-Miranda. Preparation of nanoscale iron (oxide, oxyhydroxides and zero-valent) particles derived from blueberries: Reactivity, characterization and removal mechanism of arsenate. Ecotoxicology and Environmental Safety 2017, 145, 69 -77.
AMA StyleKaren Manquián-Cerda, Edgardo Cruces, María Angélica Rubio, Camila Reyes, Nicolás Arancibia-Miranda. Preparation of nanoscale iron (oxide, oxyhydroxides and zero-valent) particles derived from blueberries: Reactivity, characterization and removal mechanism of arsenate. Ecotoxicology and Environmental Safety. 2017; 145 ():69-77.
Chicago/Turabian StyleKaren Manquián-Cerda; Edgardo Cruces; María Angélica Rubio; Camila Reyes; Nicolás Arancibia-Miranda. 2017. "Preparation of nanoscale iron (oxide, oxyhydroxides and zero-valent) particles derived from blueberries: Reactivity, characterization and removal mechanism of arsenate." Ecotoxicology and Environmental Safety 145, no. : 69-77.
The effects of Na/K substitution during the synthesis of imogolite nanotubes (NTs) were studied using a combination of structural and surface analyses. These were complemented with molecular dynamics (MD) and DFT computational models. Our results provide strong experimental evidence, obtained by various characterization techniques (FT-IR, XRD, IEP, charge measurement, and HR-TEM), showing that K changes the imogolite dimensions. In fact, in the presence of K, the nanotubes become shorter and adopt a larger diameter. Moreover, the presence of the amorphous structures associated with allophane increases, even for low K concentrations. Our results underline the complexity of imogolite synthesis engineering, highlighting their high sensitivity to the chemicals that are used during synthesis.
Nicolás Arancibia-Miranda; Mauricio Escudey; Ricardo Ramírez; Rafael I. Gonzalez; Adri C. T. Van Duin; Miguel Kiwi. Advancements in the Synthesis of Building Block Materials: Experimental Evidence and Modeled Interpretations of the Effect of Na and K on Imogolite Synthesis. The Journal of Physical Chemistry C 2017, 121, 12658 -12668.
AMA StyleNicolás Arancibia-Miranda, Mauricio Escudey, Ricardo Ramírez, Rafael I. Gonzalez, Adri C. T. Van Duin, Miguel Kiwi. Advancements in the Synthesis of Building Block Materials: Experimental Evidence and Modeled Interpretations of the Effect of Na and K on Imogolite Synthesis. The Journal of Physical Chemistry C. 2017; 121 (23):12658-12668.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Mauricio Escudey; Ricardo Ramírez; Rafael I. Gonzalez; Adri C. T. Van Duin; Miguel Kiwi. 2017. "Advancements in the Synthesis of Building Block Materials: Experimental Evidence and Modeled Interpretations of the Effect of Na and K on Imogolite Synthesis." The Journal of Physical Chemistry C 121, no. 23: 12658-12668.
Carbon nanotubes and other forms of carbon nanoparticles, as well as metal nanoparticles have been widely used in film electrochemistry because they allow for the immobilization of larger amounts of catalyst (either biological or inorganic) on the top of the modified electrodes. Nevertheless, those nanoparticles present high costs of synthesis and of separation and purification that hamper their employment. On the other hand, imogolites (Im), with the general formula (OH)3Al2O3SiOH, are naturally-occurring nanomaterials, which can be obtained from glassy volcanic ash soils and can also be synthesized at mild conditions. In this research paper, we characterize through spectroscopic techniques (i.e., fourier transform infrared spectroscopy (FTIR) spectroscopy, powder X-ray diffraction (XRD) and transmission electron microscopy (TEM)) synthetized Im and Fe-modified imogolite (Im(Fe)). Moreover, the Im and Im(Fe) were physically adsorbed on the top of a graphite electrode (GE) and were characterized electrochemically in the potential region ranging from −0.8 to 0.8 V vs. the saturated calomel electrode (SCE). When the film of the Im or of the Im(Fe) was present on the top of the electrode, the intensity of the charging/discharging current increased two-fold, but no redox activity in the absence of O2 could be appreciated. To show that Im and Im(Fe) could be used as support for catalysts, iron phthalocyanine (FePc) was adsorbed on the top of the Im or Im(Fe) film, and the electrocatalytic activity towards the O2 reduction was measured. In the presence of the Im, the measured electrocatalytic current for O2 reduction increased 30%, and the overpotential drastically decreased by almost 100 mV, proving that the Im can act as a good support for the electrocatalysts.
Carmen Castro; Nicolas Arancibia-Miranda; Cristina Acuña-Rougier; Mauricio Escudey; Federico Tasca. Spectroscopic and Electrochemical Studies of Imogolite and Fe-Modified Imogolite Nanotubes. Nanomaterials 2016, 6, 28 .
AMA StyleCarmen Castro, Nicolas Arancibia-Miranda, Cristina Acuña-Rougier, Mauricio Escudey, Federico Tasca. Spectroscopic and Electrochemical Studies of Imogolite and Fe-Modified Imogolite Nanotubes. Nanomaterials. 2016; 6 (2):28.
Chicago/Turabian StyleCarmen Castro; Nicolas Arancibia-Miranda; Cristina Acuña-Rougier; Mauricio Escudey; Federico Tasca. 2016. "Spectroscopic and Electrochemical Studies of Imogolite and Fe-Modified Imogolite Nanotubes." Nanomaterials 6, no. 2: 28.
In this work, we have studied the Pb2+ sorption capacity of Zeolite (Z) and Montmorillonite (Mt) functionalized with nanoscale zero-valent iron (nZVI), at 50% w/w, obtained by means of an impregnating process with a solvent excess. The composites were characterized by several techniques including X-ray diffraction; scanning electron microscopy (SEM); BET area; isoelectric point (IEP); and, finally a magnetic response. Comparatively significant differences in terms of electrophoretic and magnetic characteristics were found between the pristine materials and the composites. Both structures show a high efficiency and velocity in the removal of Pb2+ up to 99.0% (200.0 ppm) after 40 min of reaction time. The removal kinetics of Pb2+ is adequately described by the pseudo second-order kinetic model, and the maximum adsorbed amounts (qe) of this analyte are in close accordance with the experimental results. The intraparticle diffusion model shows that this is not the only rate-limiting step, this being the Langmuir model which was well adjusted to our experimental data. Therefore, maximum sorption capacities were found to be 115.1 ± 11.0, 105.5 ± 9.0, 68.3 ± 1.3, 54.2 ± 1.3, and 50.3 ± 4.2 mg g−1, for Mt–nZVI, Z–nZVI, Zeolite, Mt, and nZVI, respectively. The higher sorption capacities can be attributed to the synergetic behavior between the clay and iron nanoparticles, as a consequence of the clay coating process with nZVI. These results suggest that both composites could be used as an efficient adsorbent for the removal of lead from contaminated water sources.
Nicolás Arancibia-Miranda; Samuel Baltazar; Alejandra Garcia; Daniela Muñoz-Lira; Pamela Sepúlveda; María A. Rubio; Dora Altbir. Nanoscale zero valent supported by Zeolite and Montmorillonite: Template effect of the removal of lead ion from an aqueous solution. Journal of Hazardous Materials 2016, 301, 371 -380.
AMA StyleNicolás Arancibia-Miranda, Samuel Baltazar, Alejandra Garcia, Daniela Muñoz-Lira, Pamela Sepúlveda, María A. Rubio, Dora Altbir. Nanoscale zero valent supported by Zeolite and Montmorillonite: Template effect of the removal of lead ion from an aqueous solution. Journal of Hazardous Materials. 2016; 301 ():371-380.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Samuel Baltazar; Alejandra Garcia; Daniela Muñoz-Lira; Pamela Sepúlveda; María A. Rubio; Dora Altbir. 2016. "Nanoscale zero valent supported by Zeolite and Montmorillonite: Template effect of the removal of lead ion from an aqueous solution." Journal of Hazardous Materials 301, no. : 371-380.
Mauricio Escudey; Nicolás Arancibia-Miranda; Carmen Pizarro; Mónica Antilén. Effect of ash from forest fires on leaching in volcanic soils. CATENA 2015, 135, 383 -392.
AMA StyleMauricio Escudey, Nicolás Arancibia-Miranda, Carmen Pizarro, Mónica Antilén. Effect of ash from forest fires on leaching in volcanic soils. CATENA. 2015; 135 ():383-392.
Chicago/Turabian StyleMauricio Escudey; Nicolás Arancibia-Miranda; Carmen Pizarro; Mónica Antilén. 2015. "Effect of ash from forest fires on leaching in volcanic soils." CATENA 135, no. : 383-392.
Modification of surface charge and changes in the isoelectric point (IEP) of synthetic imogolite were studied for various cations in the background electrolyte (K(+), NH4(+), Mg(2+), and Ca(2+)). From the electrophoretic mobility data, it was established that the K(+) (KCl) concentration does not affect the IEP of imogolite; therefore, KCl is a suitable background electrolyte. In terms of the magnitude of changes in the IEP and surface charge, the cations may be ranked in the following order: Mg(2+)≈Ca(2+)>>NH4(+)>>K(+). Four different kinetic models were used to evaluate the influence of Mg(2+), Ca(2+), NH4(+), and K(+) on the adsorption of Cd and Cu on synthetic imogolite. When adsorption occurs in the presence of cations with the exception of K(+), the kinetics of the process is well described by the pseudo-first order model. On the other hand, when adsorption is conducted in the presence of K(+), the adsorption kinetics is well described by the pseudo-second order, Elovich, and Weber-Morris models. From the surface charge measurements, the affinity between imogolite and the cations and their effect on the adsorption of trace elements, namely Cu and Cd, were established.
Nicolás Arancibia-Miranda; Jorge Silva Yumi; Mauricio Escudey. Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite. Journal of Hazardous Materials 2015, 299, 675 -684.
AMA StyleNicolás Arancibia-Miranda, Jorge Silva Yumi, Mauricio Escudey. Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite. Journal of Hazardous Materials. 2015; 299 ():675-684.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Jorge Silva Yumi; Mauricio Escudey. 2015. "Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite." Journal of Hazardous Materials 299, no. : 675-684.
Nicolás Arancibia-Miranda; Samuel Baltazar; Alejandra Garcia; Aldo Romero; María A. Rubio; Dora Altbir. Lead removal by nano-scale zero valent iron: Surface analysis and pH effect. Materials Research Bulletin 2014, 59, 341 -348.
AMA StyleNicolás Arancibia-Miranda, Samuel Baltazar, Alejandra Garcia, Aldo Romero, María A. Rubio, Dora Altbir. Lead removal by nano-scale zero valent iron: Surface analysis and pH effect. Materials Research Bulletin. 2014; 59 ():341-348.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Samuel Baltazar; Alejandra Garcia; Aldo Romero; María A. Rubio; Dora Altbir. 2014. "Lead removal by nano-scale zero valent iron: Surface analysis and pH effect." Materials Research Bulletin 59, no. : 341-348.
We consider the use of metallic iron nanoparticles for cleaning contaminated water, focusing our study in the sorption of arsenic compounds. In particular, we discuss the results of their sorption process on the surface of zerovalent iron nanoparticles (nZVI) by performing a complete characterization of the surface modifications. Using scanning electron microscopy, X-ray diffraction analysis and high-resolution transmission electron microscopy, spectroscopy diffraction measurements and elemental mapping, we typify the surface reconstruction during the sorption process of As(V) from aqueous solutions using nZVI when it goes into a crystalline parasymplesite structure. The experimental results were correlated to the Freundlich isotherm sorption where the sorption capacity is depleted by the increase in the pH from 4 to 7 and associated with the surface passivation of nZVI. These techniques confirm the dependence of the sorption of arsenic as a function of pH and describe the specific details on the modification of the surface area of the nanoparticles.
Samuel E. Baltazar; Alejandra Garcia; Aldo Romero; María A. Rubio; Nicolás Arancibia-Miranda; Dora Altbir. Surface rearrangement of nanoscale zerovalent iron: the role of pH and its implications in the kinetics of arsenate sorption. Environmental Technology 2014, 35, 2365 -2372.
AMA StyleSamuel E. Baltazar, Alejandra Garcia, Aldo Romero, María A. Rubio, Nicolás Arancibia-Miranda, Dora Altbir. Surface rearrangement of nanoscale zerovalent iron: the role of pH and its implications in the kinetics of arsenate sorption. Environmental Technology. 2014; 35 (18):2365-2372.
Chicago/Turabian StyleSamuel E. Baltazar; Alejandra Garcia; Aldo Romero; María A. Rubio; Nicolás Arancibia-Miranda; Dora Altbir. 2014. "Surface rearrangement of nanoscale zerovalent iron: the role of pH and its implications in the kinetics of arsenate sorption." Environmental Technology 35, no. 18: 2365-2372.
Nicolás Arancibia-Miranda; Mauricio Escudey; Carmen Pizarro; Juliano C. Denardin; María Teresa García-González; José D. Fabris; Laurent Charlet. Preparation and characterization of a single-walled aluminosilicate nanotube-iron oxide composite: Its applications to removal of aqueous arsenate. Materials Research Bulletin 2014, 51, 145 -152.
AMA StyleNicolás Arancibia-Miranda, Mauricio Escudey, Carmen Pizarro, Juliano C. Denardin, María Teresa García-González, José D. Fabris, Laurent Charlet. Preparation and characterization of a single-walled aluminosilicate nanotube-iron oxide composite: Its applications to removal of aqueous arsenate. Materials Research Bulletin. 2014; 51 ():145-152.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Mauricio Escudey; Carmen Pizarro; Juliano C. Denardin; María Teresa García-González; José D. Fabris; Laurent Charlet. 2014. "Preparation and characterization of a single-walled aluminosilicate nanotube-iron oxide composite: Its applications to removal of aqueous arsenate." Materials Research Bulletin 51, no. : 145-152.
Nicolás Arancibia-Miranda; Sebastián Lillo; Mauricio Escudey. NANOTUBULAR ALUMINOSILICATES: A CASE STUDY FOR SCIENCE AND INDUSTRY. Journal of the Chilean Chemical Society 2013, 58, 2061 -2066.
AMA StyleNicolás Arancibia-Miranda, Sebastián Lillo, Mauricio Escudey. NANOTUBULAR ALUMINOSILICATES: A CASE STUDY FOR SCIENCE AND INDUSTRY. Journal of the Chilean Chemical Society. 2013; 58 (4):2061-2066.
Chicago/Turabian StyleNicolás Arancibia-Miranda; Sebastián Lillo; Mauricio Escudey. 2013. "NANOTUBULAR ALUMINOSILICATES: A CASE STUDY FOR SCIENCE AND INDUSTRY." Journal of the Chilean Chemical Society 58, no. 4: 2061-2066.
The trace element uptake process of plants is a key factor in assessing the risks of trace element build-up in agricultural soils. Scarce information exists on the trace element dynamic uptake of plants grown in the field, especially on those potentially hazardous. In this study, the uptake process of As, Cd, Cu, and Zn in maize plants was quantified and characterized throughout the entire season. Along two seasons, the uptake dynamics of field-grown maize plants in absorbing the soil borne trace elements was examined. Biomass production and the concentration of the elements in plant and soil solution samples were determined. A kinetic model was employed to characterize the uptake by plants. The kinetic parameters of the uptake process, maximum cumulative uptake rate, U max , time to reach 50 % of U max , t U50 , and reciprocal of the uptake rate, b U when followed throughout the season in terms of the plant’s growing degree days remained constant between seasons and were element specific. In spite of the large amount biomass produced, maize plants extracted minute quantities of Cd and As. Increasing cumulative uptake rates of As, Cd, Cu, and Zn from the soil took place primarily in the early half of the growing season when the biomass accumulation was still less than 50 % of the maximum harvested biomass. The element-specific plant uptake factor (PUF), which denote the partition of trace elements between the soil solution and plant phases, decreased following a first-order kinetics along the growing period, did not show any significant difference between seasons, and, at maturity stage, followed the sequence Cd≥Zn>Cu≥As. The uptake process of the elements was adequately described by the kinetic model, showing similar patterns but different magnitude and distribution in the plant. The extraction of Cd and As by plants is low in comparison to common inputs through fertilizer applications into maize production systems, indicating potential risk of trace element accumulation in soils. The PUF may be estimated according to the kinetics parameters of the uptake process. On a per-unit-soil solution element basis, Cd and Zn would be more susceptible to the soil-to-plant transfer than As and Cu.
Mauricio Molina; Mauricio Escudey; Andrew C. Chang; Weiping Chen; Nicolás Arancibia-Miranda. Trace element uptake dynamics for maize (Zea mays L.) grown under field conditions. Plant and Soil 2013, 370, 471 -483.
AMA StyleMauricio Molina, Mauricio Escudey, Andrew C. Chang, Weiping Chen, Nicolás Arancibia-Miranda. Trace element uptake dynamics for maize (Zea mays L.) grown under field conditions. Plant and Soil. 2013; 370 (1-2):471-483.
Chicago/Turabian StyleMauricio Molina; Mauricio Escudey; Andrew C. Chang; Weiping Chen; Nicolás Arancibia-Miranda. 2013. "Trace element uptake dynamics for maize (Zea mays L.) grown under field conditions." Plant and Soil 370, no. 1-2: 471-483.