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Miroslav Černík
Institute for Nanomaterials

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Communication
Published: 09 July 2021 in Chemical Communications
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We report the close correlation between the zeta potential values of catalysts and the kapp of the oxidation of several organic compounds.

ACS Style

Daniele Silvestri; Kamil Krawczyk; Mirosława Pawlyta; Maciej Krzywiecki; Vinod V.T. Padil; Rafael Torres-Mendieta; Farshid Ghanbari; Ozge Dinc; Miroslav Černík; Dionysios D. Dionysiou; Stanisław Wacławek. Influence of catalyst zeta potential on the activation of persulfate. Chemical Communications 2021, 57, 7814 -7817.

AMA Style

Daniele Silvestri, Kamil Krawczyk, Mirosława Pawlyta, Maciej Krzywiecki, Vinod V.T. Padil, Rafael Torres-Mendieta, Farshid Ghanbari, Ozge Dinc, Miroslav Černík, Dionysios D. Dionysiou, Stanisław Wacławek. Influence of catalyst zeta potential on the activation of persulfate. Chemical Communications. 2021; 57 (63):7814-7817.

Chicago/Turabian Style

Daniele Silvestri; Kamil Krawczyk; Mirosława Pawlyta; Maciej Krzywiecki; Vinod V.T. Padil; Rafael Torres-Mendieta; Farshid Ghanbari; Ozge Dinc; Miroslav Černík; Dionysios D. Dionysiou; Stanisław Wacławek. 2021. "Influence of catalyst zeta potential on the activation of persulfate." Chemical Communications 57, no. 63: 7814-7817.

Journal article
Published: 13 June 2021 in Nanomaterials
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A facile green synthetic method is proposed for the synthesis of zinc oxide nanoparticles (ZnO NPs) using the bio-template Cinnamomum tamala (C. tamala) leaves extract. The morphological, functional, and structural characterization of synthesized ZnO NPs were studied by adopting different techniques such as energy dispersive X-ray analysis (EDX), high-resolution transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Visible spectroscopy, fourier transform infrared (FTIR) spectroscopy, raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The fabricated ZnO NPs exhibit an average size of 35 nm, with a hexagonal nanostructure. Further, the well-characterized ZnO NPs were employed for the photocatalytic degradation of methylene blue (MB) in an aqueous solution. The photocatalytic activity was analyzed by changing the various physicochemical factors such as reaction time, amount of photocatalyst, precursor concentration, and calcination temperature of the ZnO NPs. All the studies suggest that the ZnO synthesized through the green protocol exhibits excellent photocatalytic potency against the dye molecules.

ACS Style

Sajina Narath; Supin Koroth; Sarojini Shankar; Bini George; Vasundhara Mutta; Stanisław Wacławek; Miroslav Černík; Vinod Padil; Rajender Varma. Cinnamomum tamala Leaf Extract Stabilized Zinc Oxide Nanoparticles: A Promising Photocatalyst for Methylene Blue Degradation. Nanomaterials 2021, 11, 1558 .

AMA Style

Sajina Narath, Supin Koroth, Sarojini Shankar, Bini George, Vasundhara Mutta, Stanisław Wacławek, Miroslav Černík, Vinod Padil, Rajender Varma. Cinnamomum tamala Leaf Extract Stabilized Zinc Oxide Nanoparticles: A Promising Photocatalyst for Methylene Blue Degradation. Nanomaterials. 2021; 11 (6):1558.

Chicago/Turabian Style

Sajina Narath; Supin Koroth; Sarojini Shankar; Bini George; Vasundhara Mutta; Stanisław Wacławek; Miroslav Černík; Vinod Padil; Rajender Varma. 2021. "Cinnamomum tamala Leaf Extract Stabilized Zinc Oxide Nanoparticles: A Promising Photocatalyst for Methylene Blue Degradation." Nanomaterials 11, no. 6: 1558.

Communication
Published: 10 June 2021 in Nanomaterials
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Traditionally, the synthesis of nanomaterials in the ultra-small size regime (1–3 nm diameter) has been linked with the employment of excessive amounts of hazardous chemicals, inevitably leading to significant environmentally detrimental effects. In the current work, we demonstrate the potential of laser fragmentation in liquids (LFL) to produce highly pure and stable iron ultra-small nanoparticles. This is carried out by reducing the size of carbonyl iron microparticles dispersed in various polar solvents (water, ethanol, ethylene glycol, polyethylene glycol 400) and liquid nitrogen. The explored method enables the fabrication of ligand-free iron oxide ultra-small nanoparticles with diameter in the 1–3 nm range, a tight size distribution, and excellent hydrodynamic stability (zeta potential > 50 mV). The generated particles can be found in different forms, including separated ultra-small NPs, ultra-small NPs forming agglomerates, and ultra-small NPs together with zero-valent iron, iron carbide, or iron oxide NPs embedded in matrices, depending on the employed solvent and their dipolar moment. The LFL technique, aside from avoiding chemical waste generation, does not require any additional chemical agent, other than the precursor microparticles immersed in the corresponding solvent. In contrast to their widely exploited chemically synthesized counterparts, the lack of additives and chemical residuals may be of fundamental interest in sectors requiring colloidal stability and the largest possible number of chemically active sites, making the presented pathway a promising alternative for the clean design of new-generation nanomaterials.

ACS Style

Ondřej Havelka; Martin Cvek; Michal Urbánek; Dariusz Łukowiec; Darina Jašíková; Michal Kotek; Miroslav Černík; Vincenzo Amendola; Rafael Torres-Mendieta. On the Use of Laser Fragmentation for the Synthesis of Ligand-Free Ultra-Small Iron Nanoparticles in Various Liquid Environments. Nanomaterials 2021, 11, 1538 .

AMA Style

Ondřej Havelka, Martin Cvek, Michal Urbánek, Dariusz Łukowiec, Darina Jašíková, Michal Kotek, Miroslav Černík, Vincenzo Amendola, Rafael Torres-Mendieta. On the Use of Laser Fragmentation for the Synthesis of Ligand-Free Ultra-Small Iron Nanoparticles in Various Liquid Environments. Nanomaterials. 2021; 11 (6):1538.

Chicago/Turabian Style

Ondřej Havelka; Martin Cvek; Michal Urbánek; Dariusz Łukowiec; Darina Jašíková; Michal Kotek; Miroslav Černík; Vincenzo Amendola; Rafael Torres-Mendieta. 2021. "On the Use of Laser Fragmentation for the Synthesis of Ligand-Free Ultra-Small Iron Nanoparticles in Various Liquid Environments." Nanomaterials 11, no. 6: 1538.

Journal article
Published: 21 May 2021 in Polymers
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The food packaging industry explores economically viable, environmentally benign, and non-toxic packaging materials. Biopolymers, including chitosan (CH) and gelatin (GE), are considered a leading replacement for plastic packaging materials, with preferred packaging functionality and biodegradability. CH, GE, and different proportions of silver nanoparticles (AgNPs) are used to prepare novel packaging materials using a simple solution casting method. The functional and morphological characterization of the prepared films was carried out by using Fourier transform infrared spectroscopy (FTIR), UV–Visible spectroscopy, and scanning electron microscopy (SEM). The mechanical strength, solubility, water vapor transmission rate, swelling behavior, moisture retention capability, and biodegradability of composite films were evaluated. The addition of AgNPs to the polymer blend matrix improves the physicochemical and biological functioning of the matrix. Due to the cross-linking motion of AgNPs, it is found that the swelling degree, moisture retention capability, and water vapor transmission rate slightly decrease. The tensile strength of pure CH–GE films was 24.4 ± 0.03, and it increased to 25.8 ± 0.05 MPa upon the addition of 0.0075% of AgNPs. The real-time application of the films was tested by evaluating the shelf-life existence of carrot pieces covered with the composite films. The composite film containing AgNPs becomes effective in lowering bacterial contamination while comparing the plastic polyethylene films. In principle, the synthesized composite films possessed all the ideal characteristics of packaging material and were considered biodegradable and biocompatible food packaging material and an alternate option for petroleum-based plastics.

ACS Style

Sreelekha Ediyilyam; Bini George; Sarojini Shankar; Thomas Dennis; Stanisław Wacławek; Miroslav Černík; Vinod Padil. Chitosan/Gelatin/Silver Nanoparticles Composites Films for Biodegradable Food Packaging Applications. Polymers 2021, 13, 1680 .

AMA Style

Sreelekha Ediyilyam, Bini George, Sarojini Shankar, Thomas Dennis, Stanisław Wacławek, Miroslav Černík, Vinod Padil. Chitosan/Gelatin/Silver Nanoparticles Composites Films for Biodegradable Food Packaging Applications. Polymers. 2021; 13 (11):1680.

Chicago/Turabian Style

Sreelekha Ediyilyam; Bini George; Sarojini Shankar; Thomas Dennis; Stanisław Wacławek; Miroslav Černík; Vinod Padil. 2021. "Chitosan/Gelatin/Silver Nanoparticles Composites Films for Biodegradable Food Packaging Applications." Polymers 13, no. 11: 1680.

Research article
Published: 24 February 2021 in Advanced Functional Materials
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This paper describes a novel conjugate biodegradable sponge based on the tree gum kondagogu with excellent selective oil/organic solvent absorption ability. The conjugate sponge is made hydrophobic (water contact angle 133°) by post‐process vapor phase silylation, has porosity of ≈94% with very low density (18.4 mg cm−3). The sponge can absorb selectively up to 19–43 times its weight of oils and organic solvents. Meanwhile, good reusability is also observed in up to at least 10 cycles. The biodegradation behavior is studied from BOD (biological oxygen demand) analysis, where the non‐silylated and silylated sponges degraded over 28 days by 92% and 76%, respectively, in waste‐water sludge. The novel conjugate bio‐based and biodegradable sponge used in this study is a promising sustainable material for clearing oil spills and for water treatment.

ACS Style

Rohith K. Ramakrishnan; Vinod V. T. Padil; Marcela Škodová; Stanisław Wacławek; Miroslav Černík; Seema Agarwal. Hierarchically Porous Bio‐Based Sustainable Conjugate Sponge for Highly Selective Oil/Organic Solvent Absorption. Advanced Functional Materials 2021, 31, 2100640 .

AMA Style

Rohith K. Ramakrishnan, Vinod V. T. Padil, Marcela Škodová, Stanisław Wacławek, Miroslav Černík, Seema Agarwal. Hierarchically Porous Bio‐Based Sustainable Conjugate Sponge for Highly Selective Oil/Organic Solvent Absorption. Advanced Functional Materials. 2021; 31 (18):2100640.

Chicago/Turabian Style

Rohith K. Ramakrishnan; Vinod V. T. Padil; Marcela Škodová; Stanisław Wacławek; Miroslav Černík; Seema Agarwal. 2021. "Hierarchically Porous Bio‐Based Sustainable Conjugate Sponge for Highly Selective Oil/Organic Solvent Absorption." Advanced Functional Materials 31, no. 18: 2100640.

Journal article
Published: 13 January 2021 in Polymers
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A novel, lightweight (8 mg/cm3), conjugate sponge of karaya gum (Kg) and chitosan (Ch) has been synthesized with very high porosity (~98%) and chemical stability, as a pH-responsive adsorbent material for the removal of anionic and cationic dyes from aqueous solutions. Experimental results showed that Kg-Ch conjugate sponge has good adsorption capacity for anionic dye methyl orange (MO: 32.81 mg/g) and cationic dye methylene blue (MB: 32.62 mg/g). The optimized Kg:Ch composition grants access to the free and pH-dependent ionizable functional groups on the surface of the sponge for the adsorption of dyes. The studies on the adsorption process as a function of pH, adsorbate concentration, adsorbent dose, and contact time indicated that the adsorption capacity of MB was decreased with increasing pH from 5 to 10 and external mass transfer together with intra-particle diffusion. The adsorption isotherm of the anionic dye MO was found to correlate with the Langmuir model (R2 = 0.99) while the adsorption of the cationic MB onto the sponge was better described by the Freundlich model (R2 = 0.99). Kinetic regression results specified that the adsorption kinetics were well represented by the pseudo-second-order model. The H-bonding, as well as electrostatic interaction between the polymers and the adsorption interactions of dyes onto Kg-Ch sponge from aqueous solutions, were investigated using attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, and the highly wrinkled porous morphology was visualized in depth by field-emission scanning electron microscopy (FE-SEM) analysis. Moreover, the samples could be reused without loss of contaminant removal capacity over six successive adsorption-desorption cycles. The hierarchical three-dimensional sponge-like structure of Kg has not been reported yet and this novel Kg-Ch sponge functions as a promising candidate for the uninterrupted application of organic pollutant removal from water.

ACS Style

Rohith K. Ramakrishnan; Vinod V. T. Padil; Stanisław Wacławek; Miroslav Černík; Rajender S. Varma. Eco-Friendly and Economic, Adsorptive Removal of Cationic and Anionic Dyes by Bio-Based Karaya Gum—Chitosan Sponge. Polymers 2021, 13, 251 .

AMA Style

Rohith K. Ramakrishnan, Vinod V. T. Padil, Stanisław Wacławek, Miroslav Černík, Rajender S. Varma. Eco-Friendly and Economic, Adsorptive Removal of Cationic and Anionic Dyes by Bio-Based Karaya Gum—Chitosan Sponge. Polymers. 2021; 13 (2):251.

Chicago/Turabian Style

Rohith K. Ramakrishnan; Vinod V. T. Padil; Stanisław Wacławek; Miroslav Černík; Rajender S. Varma. 2021. "Eco-Friendly and Economic, Adsorptive Removal of Cationic and Anionic Dyes by Bio-Based Karaya Gum—Chitosan Sponge." Polymers 13, no. 2: 251.

Review article
Published: 05 January 2021 in International Journal of Biological Macromolecules
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This review summarizes and broadly classifies all of the major sustainable natural carbohydrate bio-macromolecular manifestations in nature – from botanical (cellulose, starch, and pectin), seaweed (alginate, carrageenan, and agar), microbial (bacterial cellulose, dextran, and pullulan), and animal (hyaluronan, heparin, chitin, and chitosan) sources – that have been contrived into electrospun fibers. Furthermore, a relative study of these biomaterials for the fabrication of nanofibers by electrospinning and their characteristics viz. solution behavior, blending nature, as well as rheological and fiber attributes are discussed. The potential multidimensional applications of nanofibers (filtration, antimicrobial, biosensor, gas sensor, energy storage, catalytic, and tissue engineering) originating from these polysaccharides and their major impacts on the properties, functionalities, and uses of these electrospun fibers are compared and critically examined.

ACS Style

K.P. Akshay Kumar; Ehsan Nazarzadeh Zare; Rafael Torres-Mendieta; Stanisław Wacławek; Pooyan Makvandi; Miroslav Černík; Vinod V.T. Padil; Rajender S. Varma. Electrospun fibers based on botanical, seaweed, microbial, and animal sourced biomacromolecules and their multidimensional applications. International Journal of Biological Macromolecules 2021, 171, 130 -149.

AMA Style

K.P. Akshay Kumar, Ehsan Nazarzadeh Zare, Rafael Torres-Mendieta, Stanisław Wacławek, Pooyan Makvandi, Miroslav Černík, Vinod V.T. Padil, Rajender S. Varma. Electrospun fibers based on botanical, seaweed, microbial, and animal sourced biomacromolecules and their multidimensional applications. International Journal of Biological Macromolecules. 2021; 171 ():130-149.

Chicago/Turabian Style

K.P. Akshay Kumar; Ehsan Nazarzadeh Zare; Rafael Torres-Mendieta; Stanisław Wacławek; Pooyan Makvandi; Miroslav Černík; Vinod V.T. Padil; Rajender S. Varma. 2021. "Electrospun fibers based on botanical, seaweed, microbial, and animal sourced biomacromolecules and their multidimensional applications." International Journal of Biological Macromolecules 171, no. : 130-149.

Journal article
Published: 30 November 2020 in Environmental Sciences Europe
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Background Nanoscale zero-valent iron (nZVI) is commonly used for remediation of groundwater contaminated by chlorinated ethenes (CEs); however, its long-term reactivity and subsurface transport are limited. A novel nZVI–AC material, consisting of colloidal activated carbon (AC) with embedded nZVI clusters, was developed with the aim of overcoming the limitations of nZVI alone. Results Application of a limited amount of nZVI–AC to an oxic, nitrate-rich, highly permeable quaternary aquifer triggered time-limited transformation of CEs, with noticeable involvement of reductive dechlorination. Reductive dechlorination of CEs was dominantly abiotic, as an increase in the concentration of vinyl chloride (VC) and ethene did not coincide with an increase in the abundance of reductive biomarkers for complete dechlorination of CEs (Dehalococcoides, Dehalogenimonas, VC reductase genes vcrA and bvcA). Application of nZVI–AC under unfavourable hydrochemical conditions resulted in no dramatic change in the microbial community, the reducing effect resulting in temporal proliferation of nitrate and iron reducers only. At a later stage, generation of reduced iron induced an increase in iron-oxidizing bacteria. High concentrations and a continuous mass influx of competing electron acceptors (nitrate and dissolved oxygen) created unfavourable conditions for sulphate-reducers and organohalide-respiring bacteria, though it allowed the survival of aerobic microorganisms of the genera Pseudomonas, Polaromonas and Rhodoferax, known for their ability to assimilate VC or cis-1,2-dichloroethene. A potential for aerobic oxidative degradation of CE metabolites was also indicated by detection of the ethenotroph functional gene etnE. Conclusions This pilot study, based on the application of nZVI–AC, failed to provide a sustainable effect on CE contamination; however, it provided valuable insights into induced hydrogeochemical and microbial processes that could help in designing full-scale applications.

ACS Style

Marie Czinnerova; Nhung H. A. Nguyen; Jan Nemecek; Katrin Mackenzie; Christopher Boothman; Jonathan Lloyd; Tamas Laszlo; Roman Spanek; Miroslav Cernik; Alena Sevcu. In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities. Environmental Sciences Europe 2020, 32, 1 -15.

AMA Style

Marie Czinnerova, Nhung H. A. Nguyen, Jan Nemecek, Katrin Mackenzie, Christopher Boothman, Jonathan Lloyd, Tamas Laszlo, Roman Spanek, Miroslav Cernik, Alena Sevcu. In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities. Environmental Sciences Europe. 2020; 32 (1):1-15.

Chicago/Turabian Style

Marie Czinnerova; Nhung H. A. Nguyen; Jan Nemecek; Katrin Mackenzie; Christopher Boothman; Jonathan Lloyd; Tamas Laszlo; Roman Spanek; Miroslav Cernik; Alena Sevcu. 2020. "In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities." Environmental Sciences Europe 32, no. 1: 1-15.

Research article
Published: 24 September 2020 in ACS Omega
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A novel greener methodology is reported for the synthesis of titanium dioxide (TiO2) nanoparticles (NPs) using gum Arabic (Acacia senegal) and the characterization of the ensuing TiO2 NPs by various techniques such as X-ray diffraction (XRD), Fourier transform infrared, Raman spectroscopy, scanning electron microscopy–energy dispersive X-ray, transmission electron microscopy (TEM), high resolution-TEM, and UV–visible spectroscopy. The XRD analysis confirmed the formation of TiO2 NPs in the anatase phase with high crystal purity, while TEM confirmed the size to be 8.9 ± 1.5 nm with a spherical morphology. The electrode for the electrochemical detection of Pb2+ ions was modified by a carbon paste fabricated using the synthesized TiO2 NPs. Compared to the bare electrode, the fabricated electrode exhibited improved electro–catalytic activity toward the reduction of Pb2+ ions. The detection limit, quantification limit, and the sensitivity of the developed electrode were observed by using differential pulse voltammetry to be 506 ppb, 1.68 ppm, and 0.52 ± 0.01 μA μM–1, respectively. The constructed electrode was tested for the detection of lead content in plastic toys.

ACS Style

Saranya Kothaplamoottil Sivan; Sarojini Sharath Shankar; Sajina N; Akshaykumar Kandambath Padinjareveetil; Rajendra Pilankatta; V. B. Sameer Kumar; Beena Mathew; Bini George; Pooyan Makvandi; Miroslav Černík; Vinod V. T. Padil; Rajender S. Varma. Fabrication of a Greener [email protected] Arabic-Carbon Paste Electrode for the Electrochemical Detection of Pb2+ Ions in Plastic Toys. ACS Omega 2020, 5, 25390 -25399.

AMA Style

Saranya Kothaplamoottil Sivan, Sarojini Sharath Shankar, Sajina N, Akshaykumar Kandambath Padinjareveetil, Rajendra Pilankatta, V. B. Sameer Kumar, Beena Mathew, Bini George, Pooyan Makvandi, Miroslav Černík, Vinod V. T. Padil, Rajender S. Varma. Fabrication of a Greener [email protected] Arabic-Carbon Paste Electrode for the Electrochemical Detection of Pb2+ Ions in Plastic Toys. ACS Omega. 2020; 5 (39):25390-25399.

Chicago/Turabian Style

Saranya Kothaplamoottil Sivan; Sarojini Sharath Shankar; Sajina N; Akshaykumar Kandambath Padinjareveetil; Rajendra Pilankatta; V. B. Sameer Kumar; Beena Mathew; Bini George; Pooyan Makvandi; Miroslav Černík; Vinod V. T. Padil; Rajender S. Varma. 2020. "Fabrication of a Greener [email protected] Arabic-Carbon Paste Electrode for the Electrochemical Detection of Pb2+ Ions in Plastic Toys." ACS Omega 5, no. 39: 25390-25399.

Journal article
Published: 24 June 2020 in Sustainability
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The chemical industry is a particularly sensitive sector that very often works with toxic, harmful and dangerous substances. This paper o ers insight into the corporate socially responsible (CSR) behaviour of a specific segment of the chemical industry—the production of fluorinated ski waxes. Perfluorinated compounds, which excel in water and fat stability and repellency, are nowadays considered as harmful to human health and nature. During 2020, the basic compound, perfluorooctanoic acid (PFOA), will be banned, and finding its replacement will be a dicult task. So far, there are no alternatives in terms of environmentally friendly compounds that can maintain the desired properties of extreme ski glide. Based on a questionnaire distributed to twenty wax producers worldwide, we have concluded that, although the attitudes of companies towards CSR certification was rather negative (87.5%), and companies had not developed or documented any CSR policy/strategy with specific goals, they found CSR activities/instruments beneficial and important. The survey highlighted the fact that companies were aware that their products are dangerous for the environment, and that environmental issues are important for all of the responders, despite them being mostly without certified systems. The size of a company had no significant e ect on their attitude. Micro and small producers were involved in raising awareness of environmental policies and responsibilities to the same extent (maybe even more) as medium or large companies. We also found varying behaviours between companies involved in environmental programs and those who were not. The companies involved felt a strong attitude towards all three pillars of CSR, which are the environment, as well as social and economic aspects. Those companies not involved had a strong attitude towards their customers, but not towards their employees, suppliers or the wider community. They also had stronger feelings about the quality of their products and economic profit, but without a strong approach to the related environmental issues. The Norwegian approach and the commitment of the company Swix to CSR are two positive examples leading to a fluorine-free future.

ACS Style

Pavla Svermova; Miroslav Cernik. Corporate Social Responsibility of Companies Producing PFOA Containing Waxes for Cross-Country Skiing. Sustainability 2020, 12 .

AMA Style

Pavla Svermova, Miroslav Cernik. Corporate Social Responsibility of Companies Producing PFOA Containing Waxes for Cross-Country Skiing. Sustainability. 2020; 12 (12):.

Chicago/Turabian Style

Pavla Svermova; Miroslav Cernik. 2020. "Corporate Social Responsibility of Companies Producing PFOA Containing Waxes for Cross-Country Skiing." Sustainability 12, no. 12: .

Journal article
Published: 18 May 2020 in Polymers
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We have fabricated ZnO nanoflake structures using degummed silk fibers as templates, via soaking and calcining the silk fibers bearing ZnO nanoparticles at 150 °C for 6 h. The obtained ZnO nanostructures were characterized using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), and UV-vis and fluorescence spectroscopic analysis. The size (~500–700 nm) in length and thicknesses (~60 nm) of ZnO nanoflakes were produced. The catalysis performances of ZnO nanoflakes on silk fibers (ZnSk) via photo-degradation of naphthalene (93% in 256 min), as well as Rose Bengal dye removal (~1.7 mM g−1) through adsorption from aqueous solution, were practically observed. Further, ZnSk displayed superb antibacterial activity against the tested model gram-negative Escherichia coli bacterium. The produced ZnSk has huge scope to be used for real-world water contaminants remediation applications.

ACS Style

K. Jagajjanani Rao; Tarangini Korumilli; AkshayKumar Kp; Stanislaw Wacławek; Miroslav Černík; Vinod V. T. Padil. Development of ZnO Nanoflake Type Structures Using Silk Fibres as Template for Water Pollutants Remediation. Polymers 2020, 12, 1151 .

AMA Style

K. Jagajjanani Rao, Tarangini Korumilli, AkshayKumar Kp, Stanislaw Wacławek, Miroslav Černík, Vinod V. T. Padil. Development of ZnO Nanoflake Type Structures Using Silk Fibres as Template for Water Pollutants Remediation. Polymers. 2020; 12 (5):1151.

Chicago/Turabian Style

K. Jagajjanani Rao; Tarangini Korumilli; AkshayKumar Kp; Stanislaw Wacławek; Miroslav Černík; Vinod V. T. Padil. 2020. "Development of ZnO Nanoflake Type Structures Using Silk Fibres as Template for Water Pollutants Remediation." Polymers 12, no. 5: 1151.

Article
Published: 10 May 2020 in Journal of Materials Science: Materials in Electronics
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In this study, the potential of multi-walled carbon nanotubes (MCNT) in processing rare-earth-free MnAl(MCNT)/Fe nanocomposite magnets was exploited through adopting a combination of surfactant-assisted milling and resin-bonding techniques. The required hard and soft magnetic phases such as MnAl(MCNT) and α-Fe, respectively, were individually subjected to surfactant-assisted high-energy ball milling. The surfactant-coated MnAl(MCNT) and Fe nanopowders, thus, obtained were characterized with respect to their structural and magnetic properties. Relatively, a very high coercivity, Hc (4.48 kOe), was obtained for the surfactant-coated MnAl(MCNT) powders after 6 h of milling, while in the case of Fe powders with high saturation magnetization, Ms (218.6 emu/g) was achieved at 3 h of surfactant-assisted milling. The MnAl(MCNT) powders with high Hc were mixed with the Fe powders of high Ms with different weight percentages: 0, 5 and 10. The nanocomposite powder mixtures were further milled for 1 h and then processed in the form of resin bonded magnets under aligning magnetic field of 20 kOe. The obtained bonded nanocomposite magnet, i.e. MnAl(MCNT) with 5 wt% of Fe addition demonstrated a good combination of high Ms (63.7 emu/g) and high Hc (4.46 kOe).

ACS Style

P. Saravanan; Sarah Saju; V. T. P. Vinod; Miroslav Černík. Structural and magnetic properties of rare-earth-free MnAl(MCNT)/Fe nanocomposite magnets processed by resin-bonding technique. Journal of Materials Science: Materials in Electronics 2020, 31, 9878 -9887.

AMA Style

P. Saravanan, Sarah Saju, V. T. P. Vinod, Miroslav Černík. Structural and magnetic properties of rare-earth-free MnAl(MCNT)/Fe nanocomposite magnets processed by resin-bonding technique. Journal of Materials Science: Materials in Electronics. 2020; 31 (12):9878-9887.

Chicago/Turabian Style

P. Saravanan; Sarah Saju; V. T. P. Vinod; Miroslav Černík. 2020. "Structural and magnetic properties of rare-earth-free MnAl(MCNT)/Fe nanocomposite magnets processed by resin-bonding technique." Journal of Materials Science: Materials in Electronics 31, no. 12: 9878-9887.

Journal article
Published: 03 May 2020 in Polymers
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Over the years, polyaniline (PANI) has received enormous attention due to its unique properties. Herein, it was chosen to develop a new polymeric composite material: reduced graphene oxide/polyaniline (rGO/PANI). The composite was prepared by a simple and cost-effective fabrication method of formation by mixing and sonication in various conditions. The obtained materials were characterized and identified using various techniques such as scanning electron microscopy (SEM), Raman and ATR–FTIR spectroscopy, and X-ray diffraction (XRD). The objective of the paper was to confirm its applicability for the removal of contaminants from water. Water could be contaminated by various types of pollutants, e.g., inorganics, heavy metals, and many other industrial compounds, including dyes. We confirmed that the Acid Blue 129 dyes can be substantially removed through adsorption on prepared rGO/PANI. The adsorption kinetic data were modeled using the pseudo-first-order and pseudo-second-order models and the adsorption isotherm model was identified.

ACS Style

Tomasz Kukulski; Stanisław Wacławek; Daniele Silvestri; Kamil Krawczyk; Vinod V. T. Padil; Ryszard Fryczkowski; Jarosław Janicki; Miroslav Černík. A Polymeric Composite Material (rGO/PANI) for Acid Blue 129 Adsorption. Polymers 2020, 12, 1051 .

AMA Style

Tomasz Kukulski, Stanisław Wacławek, Daniele Silvestri, Kamil Krawczyk, Vinod V. T. Padil, Ryszard Fryczkowski, Jarosław Janicki, Miroslav Černík. A Polymeric Composite Material (rGO/PANI) for Acid Blue 129 Adsorption. Polymers. 2020; 12 (5):1051.

Chicago/Turabian Style

Tomasz Kukulski; Stanisław Wacławek; Daniele Silvestri; Kamil Krawczyk; Vinod V. T. Padil; Ryszard Fryczkowski; Jarosław Janicki; Miroslav Černík. 2020. "A Polymeric Composite Material (rGO/PANI) for Acid Blue 129 Adsorption." Polymers 12, no. 5: 1051.

Journal article
Published: 23 April 2020 in Catalysts
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Wastewater from the textile industry has a substantial impact on water quality. Synthetic dyes used in the textile production process are often discharged into water bodies as residues. Highly colored wastewater causes various of problems for the aquatic environment such as: reducing light penetration, inhibiting photosynthesis and being toxic to certain organisms. Since most dyes are resistant to biodegradation and are not completely removed by conventional methods (adsorption, coagulation-flocculation, activated sludge, membrane filtration) they persist in the environment. Advanced oxidation processes (AOPs) based on hydrogen peroxide (H2O2) have been proven to decolorize only some of the dyes from wastewater by photocatalysis. In this article, we compared two very different photocatalytic systems (UV/peroxydisulfate and UV/H2O2). Photocatalyzed activation of peroxydisulfate (PDS) generated sulfate radicals (SO4•−), which reacted with the selected anthraquinone dye of concern, Acid Blue 129 (AB129). Various conditions, such as pH and concentration of PDS were applied, in order to obtain an effective decolorization effect, which was significantly better than in the case of hydroxyl radicals. The kinetics of the reaction followed a pseudo-first order model. The main reaction pathway was also proposed based on quantum chemical analysis. Moreover, the toxicity of the solution after treatment was evaluated using Daphnia magna and Lemna minor, and was found to be significantly lower compared to the toxicity of the initial dye.

ACS Style

Kamil Krawczyk; Stanisław Wacławek; Edyta Kudlek; Daniele Silvestri; Tomasz Kukulski; Klaudiusz Grübel; Vinod V. T. Padil; Miroslav Černík. UV-Catalyzed Persulfate Oxidation of an Anthraquinone Based Dye. Catalysts 2020, 10, 456 .

AMA Style

Kamil Krawczyk, Stanisław Wacławek, Edyta Kudlek, Daniele Silvestri, Tomasz Kukulski, Klaudiusz Grübel, Vinod V. T. Padil, Miroslav Černík. UV-Catalyzed Persulfate Oxidation of an Anthraquinone Based Dye. Catalysts. 2020; 10 (4):456.

Chicago/Turabian Style

Kamil Krawczyk; Stanisław Wacławek; Edyta Kudlek; Daniele Silvestri; Tomasz Kukulski; Klaudiusz Grübel; Vinod V. T. Padil; Miroslav Černík. 2020. "UV-Catalyzed Persulfate Oxidation of an Anthraquinone Based Dye." Catalysts 10, no. 4: 456.

Review
Published: 27 February 2020 in Polymers
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Natural biopolymers, a class of materials extracted from renewable sources, is garnering interest due to growing concerns over environmental safety; biopolymers have the advantage of biocompatibility and biodegradability, an imperative requirement. The synthesis of nanoparticles and nanofibers from biopolymers provides a green platform relative to the conventional methods that use hazardous chemicals. However, it is challenging to characterize these nanoparticles and fibers due to the variation in size, shape, and morphology. In order to evaluate these properties, microscopic techniques such as optical microscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM) are essential. With the advent of new biopolymer systems, it is necessary to obtain insights into the fundamental structures of these systems to determine their structural, physical, and morphological properties, which play a vital role in defining their performance and applications. Microscopic techniques perform a decisive role in revealing intricate details, which assists in the appraisal of microstructure, surface morphology, chemical composition, and interfacial properties. This review highlights the significance of various microscopic techniques incorporating the literature details that help characterize biopolymers and their derivatives.

ACS Style

Abhilash Venkateshaiah; Vinod V.T. Padil; Malladi Nagalakshmaiah; Stanisław Waclawek; Miroslav Černík; Rajender S. Varma. Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives. Polymers 2020, 12, 512 .

AMA Style

Abhilash Venkateshaiah, Vinod V.T. Padil, Malladi Nagalakshmaiah, Stanisław Waclawek, Miroslav Černík, Rajender S. Varma. Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives. Polymers. 2020; 12 (3):512.

Chicago/Turabian Style

Abhilash Venkateshaiah; Vinod V.T. Padil; Malladi Nagalakshmaiah; Stanisław Waclawek; Miroslav Černík; Rajender S. Varma. 2020. "Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives." Polymers 12, no. 3: 512.

Journal article
Published: 22 January 2020 in Water
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A stall of cis-1,2-DCE and vinyl chloride (VC) is frequently observed during bioremediation of groundwater chloroethenes via reductive dechlorination. These chloroethenes may be oxidised by aerobic methanotrophs or ethenotrophs co-metabolically and/or metabolically. We assessed the potential for such oxidation at 12 sites (49 groundwater samples) using hydrochemical and molecular biological tools. Both ethenotroph (etnC and etnE) and methanotroph (mmoX and pmoA) functional genes were identified in 90% of samples, while reductive dehalogenase functional genes (vcrA and bvcA) were identified in 82%. All functional genes were simultaneously detected in 78% of samples, in actively biostimulated sites in 88% of samples. Correlation analysis revealed that cis-1,2-DCE concentration was positively correlated with vcrA, etnC and etnE, while VC concentration was correlated with etnC, etnE, vcrA and bvcA. However, feature selection based on random forest classification indicated a significant relationship for the vcrA in relation to cis-1,2-DCE, and vcrA, bvcA and etnE for VC and no prove of relationship between cis-1,2-DCE or VC and the methanotroph functional genes. Analysis of hydrochemical parameters indicated that aerobic oxidation of chloroethenes by ethenotrophs may take place under a range of redox conditions of aquifers and coincide with high ethene and VC concentrations.

ACS Style

Jan Němeček; Kristýna Marková; Roman Špánek; Vojtěch Antoš; Petr Kozubek; Ondřej Lhotský; Miroslav Černík. Hydrochemical Conditions for Aerobic/Anaerobic Biodegradation of Chlorinated Ethenes—A Multi-Site Assessment. Water 2020, 12, 322 .

AMA Style

Jan Němeček, Kristýna Marková, Roman Špánek, Vojtěch Antoš, Petr Kozubek, Ondřej Lhotský, Miroslav Černík. Hydrochemical Conditions for Aerobic/Anaerobic Biodegradation of Chlorinated Ethenes—A Multi-Site Assessment. Water. 2020; 12 (2):322.

Chicago/Turabian Style

Jan Němeček; Kristýna Marková; Roman Špánek; Vojtěch Antoš; Petr Kozubek; Ondřej Lhotský; Miroslav Černík. 2020. "Hydrochemical Conditions for Aerobic/Anaerobic Biodegradation of Chlorinated Ethenes—A Multi-Site Assessment." Water 12, no. 2: 322.

Chapter
Published: 18 January 2020 in Applied Environmental Science and Engineering for a Sustainable Future
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Chromium is used ubiquitously in various industrial applications as it has several advantages. It can provide, e.g., a robust and rust-resistant coating for various materials. However, the most dangerous form—chromium(VI)—is soluble in water and therefore can trigger numerous health problems. One of the most common ways to remediate Cr(VI) is to reduce it to a less toxic and mobile form, i.e., chromium(III). This can be achieved in different ways; nevertheless, this chapter will mainly cover the in situ reduction of Cr(VI) with sulfur compounds. Two sites contaminated with Cr(VI) will be presented, and actions related to their decontamination will be described. The design of the planned techniques will be assessed, in the bench-scale studies first. Afterwards remediation in the field scale will be shown as a model example of how to manage and operate remedial interventions for sites contaminated with Cr(VI) based on the in situ reduction with the sulfur compounds.

ACS Style

Jan Němeček; Stanisław Wacławek; Miroslav Černík. Other Chemical Reductive Methods. Applied Environmental Science and Engineering for a Sustainable Future 2020, 53 -64.

AMA Style

Jan Němeček, Stanisław Wacławek, Miroslav Černík. Other Chemical Reductive Methods. Applied Environmental Science and Engineering for a Sustainable Future. 2020; ():53-64.

Chicago/Turabian Style

Jan Němeček; Stanisław Wacławek; Miroslav Černík. 2020. "Other Chemical Reductive Methods." Applied Environmental Science and Engineering for a Sustainable Future , no. : 53-64.

Chapter
Published: 18 January 2020 in Applied Environmental Science and Engineering for a Sustainable Future
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Electrogeochemical processes as a whole remedial technology have a considerable application potential. They may be applied at sites with complex geological conditions where hydraulic intervention is inefficient or unreliable. In the case of ClE remediation, electrochemical processes can substantially accelerate not only the time necessary for the process of reductive dechlorination, but they also significantly reduce the necessary dose of principal reagents-especially costly nanoscale zero-valent iron (nZVI) particles. It is of operational importance to accelerate the transport of nZVI and its oxidation products in the electric field and to ensure the homogeneous distribution of nZVI in the required space by suppressing the aggregation of the particles. By arranging the electrodes, it is possible to accelerate the migration or, in contrast, stabilize the particles at a predetermined location. For example, this effect can be used to operate geochemical reactive barriers that can reliably replace hydraulic barriers at certain sites. At the model site, a decrease in the measured concentrations of ClE in relation to the connection of a direct current is demonstrated. These concentrations were measured in the monitoring boreholes that were not directly used to infiltrate the reactants and are located between the electrodes. This demonstrates a spatial reduction in the concentrations throughout the treated area.

ACS Style

Miroslav Černík; Jaroslav Hrabal; Jaroslav Nosek. Combination of Electrokinetics and nZVI Remediation. Applied Environmental Science and Engineering for a Sustainable Future 2020, 65 -85.

AMA Style

Miroslav Černík, Jaroslav Hrabal, Jaroslav Nosek. Combination of Electrokinetics and nZVI Remediation. Applied Environmental Science and Engineering for a Sustainable Future. 2020; ():65-85.

Chicago/Turabian Style

Miroslav Černík; Jaroslav Hrabal; Jaroslav Nosek. 2020. "Combination of Electrokinetics and nZVI Remediation." Applied Environmental Science and Engineering for a Sustainable Future , no. : 65-85.

Chapter
Published: 18 January 2020 in Applied Environmental Science and Engineering for a Sustainable Future
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Water is a solvent that is absolutely essential to sustain life. It is one of the world’s most precious resources. The uniqueness consists in its polarity, high boiling point, and some other important properties. Several of the water parameters, for example, alkalinity or redox potential, were discussed in this chapter. The environmental significance of these basic parameters is enormous because they are affecting the stability and mobility of substances in the ecosystem, and other parameters are either directly determined or strongly influenced by them. In addition, further important geochemical aspects, presented, for example, in the graphical form, i.e., the pε-pH diagram (Pourbaix diagram) or redox ladder, were thoroughly explained in this chapter. Subsequently, the in situ chemical reduction (ISCR) techniques were discussed with the special emphasis on the nano zero-valent iron (nZVI). The nZVI reactions and thermodynamics behind them were also reviewed here.

ACS Style

Miroslav Černík; Josef Zeman. Geochemical Principles of Reductive Remediation Processes. Applied Environmental Science and Engineering for a Sustainable Future 2020, 3 -17.

AMA Style

Miroslav Černík, Josef Zeman. Geochemical Principles of Reductive Remediation Processes. Applied Environmental Science and Engineering for a Sustainable Future. 2020; ():3-17.

Chicago/Turabian Style

Miroslav Černík; Josef Zeman. 2020. "Geochemical Principles of Reductive Remediation Processes." Applied Environmental Science and Engineering for a Sustainable Future , no. : 3-17.

Journal article
Published: 30 December 2019 in Carbohydrate Polymers
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This work describes an eco-friendly and sustainable technique for the synthesis of silver nanoparticles (nAg), where chitosan-poly(3-hydroxybutyrate) polymer conjugate (Chit-PHB) acts as a reducing and stabilizing material. The ensuing nanoparticles show an exceptional catalytic activity in the reduction of 4-nitrophenol to 4-aminophenol. nAg were characterized by several techniques, i.e. SEM and TEM-EDX, to confirm their production, size and morphology. Furthermore, infrared spectroscopy analysis proved the presence of a Chit-PHB coating on the nAg. The excellent catalytic properties of the nAg-Chit-PHB was discernible when the activity parameter (κc) normalized by the specific surface area (SSA) of the nanoparticles was taken into consideration; normalization of κc by the SSA is a vital parameter for the assessment of the accessibility to the surface area of particles. Herein synthesized Ag nanoparticles, as far as we know, exhibited the fastest reaction kinetics of 4-nitrophenol reduction compared to the silver nanoparticles reported in the literature.

ACS Style

Daniele Silvestri; Stanisław Wacławek; Abhilash Venkateshaiah; Kamil Krawczyk; Bartłomiej Sobel; Vinod V.T. Padil; Miroslav Černík; Rajender S. Varma. Synthesis of Ag nanoparticles by a chitosan-poly(3-hydroxybutyrate) polymer conjugate and their superb catalytic activity. Carbohydrate Polymers 2019, 232, 115806 .

AMA Style

Daniele Silvestri, Stanisław Wacławek, Abhilash Venkateshaiah, Kamil Krawczyk, Bartłomiej Sobel, Vinod V.T. Padil, Miroslav Černík, Rajender S. Varma. Synthesis of Ag nanoparticles by a chitosan-poly(3-hydroxybutyrate) polymer conjugate and their superb catalytic activity. Carbohydrate Polymers. 2019; 232 ():115806.

Chicago/Turabian Style

Daniele Silvestri; Stanisław Wacławek; Abhilash Venkateshaiah; Kamil Krawczyk; Bartłomiej Sobel; Vinod V.T. Padil; Miroslav Černík; Rajender S. Varma. 2019. "Synthesis of Ag nanoparticles by a chitosan-poly(3-hydroxybutyrate) polymer conjugate and their superb catalytic activity." Carbohydrate Polymers 232, no. : 115806.