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Your search keyword '"Mausam"' showing total 3 results
Start Over Author "Mausam" Topic biochar Journal science of the total environment
3 results on '"Mausam"'

1. Degradation of chlortetracycline using immobilized laccase on Polyacrylonitrile-biochar composite nanofibrous membrane

Author

Emile J. Knystautas, Mausam P. Verma, Mehrdad Taheran, Satinder Kaur Brar, Mitra Naghdi, and Rao Y. Surampalli

Subjects
Chlortetracycline, Laccase, Environmental Engineering, ABTS, Chromatography, Polyacrylonitrile, 02 engineering and technology, 010501 environmental sciences, 021001 nanoscience & nanotechnology, 01 natural sciences, Pollution, 6. Clean water, chemistry.chemical_compound, chemistry, Wastewater, Biochar, medicine, Environmental Chemistry, Degradation (geology), 0210 nano-technology, Waste Management and Disposal, Effluent, 0105 earth and related environmental sciences, medicine.drug
Abstract

The continuous release of antibiotic compounds through wastewater effluent into environment has raised concerns about their potential problems for different organisms. Enzymatic degradation with laccase is a green option for removal of pharmaceutical compounds from aqueous media. In this study, laccase was immobilized onto homemade Polyacrylonitrile-biochar composite nanofibrous membrane and the obtained biocatalyst was employed for removal of chlortetracycline, a widely used antibiotic, from aqueous media in continuous mode. The results showed that the immobilized laccase has improved storage, temperature and pH stability compared to free laccase. Also, it retained more than 50% of its initial activity after 7cycles of ABTS oxidation which indicated improved enzyme reusability. Finally, while using immobilized laccase for degradation of chlortetracycline in continuous mode exhibited 58.3%, 40.7% and 22.6% chlortetracycline removal efficiency at flux rates of 1, 2 and 3mL/h∙cm2.

Published
2017

2. Adsorption study of environmentally relevant concentrations of chlortetracycline on pinewood biochar

Author

Mehrdad Taheran, Satinder Kaur Brar, Antonio Avalos Ramirez, Rao Y. Surampalli, Mitra Naghdi, Mausam P. Verma, José R. Valéro, and Emile J. Knystautas

Subjects
Environmental Engineering, Scanning electron microscope, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, symbols.namesake, Adsorption, Biochar, Zeta potential, Environmental Chemistry, Picea, Charcoal, Waste Management and Disposal, 0105 earth and related environmental sciences, Aqueous solution, Chemistry, Langmuir adsorption model, Pinus, 021001 nanoscience & nanotechnology, Wood, Pollution, 6. Clean water, Anti-Bacterial Agents, Wastewater, Environmental chemistry, visual_art, symbols, visual_art.visual_art_medium, 0210 nano-technology, Abies, Water Pollutants, Chemical, Chlortetracycline, Nuclear chemistry
Abstract

The presence of pharmaceutically active compounds (PhACs) in water and wastewater has raised concerns because of potential environmental impacts and thus their removal is of high importance. The adsorption behavior of chlortetracycline (CTC) from aqueous solution on raw and activated pinewood biochar was studied at 298 K. The effect of initial pH of the solution was studied by performing the experiment at three different pHs (1, 5 and 9). At each pH, CTC showed varied electrostatic charge (+1, 0 and -1, respectively) which affected its adsorption. The results indicated that CTC followed Langmuir isotherm and the related parameters were calculated. Also, it was observed that the maximum adsorption occurred at pH1. The adsorption capacity of CTC for raw and activated biochar was at least 2.1 and 208.3mg/g adsorbent, respectively. The characteristics of biochars were studied using zeta potential analyzer, laser size analyzer and scanning electron microscopy (SEM). The results showed that raw and activated biochars are promising candidates for removal of CTC from water due to the acidic character of pinewood that can result in better interaction with ionizable compounds at lower pHs.

Published
2016

3. Adsorptive immobilization of agro-industrially produced crude laccase on various micro-biochars and degradation of diclofenac.

Author

Lonappan, Linson, Liu, Yuxue, Rouissi, Tarek, Brar, Satinder Kaur, Verma, Mausam, and Surampalli, Rao Y.

Subjects
*BIODEGRADATION, *ADSORPTION (Chemistry), *AGRICULTURAL industries, *LACCASE, *BIOCHAR, *DICLOFENAC
Abstract

Although enzymes are gifted with unique and unprecedented catalytic activity and selectivity over a wide range of pollutants, still their stability related issues often hinder their application in real environmental conditions. In this study, agro-industrially produced crude laccase was concentrated using ultrafiltration. Crude laccase was immobilized on pine wood (BC-PW), pig manure (BC-PM) and almond shell (BC-AS) biochar microparticles. Immobilization of laccase was investigated at various laccase activities on micro-biochars and the release (desorption) of the enzyme has been studied. It was observed that for all the biochars, as the initial concentration of laccase increased in the crude solution, the binding capacity and as result immobilization efficiency also increased. BC-PM was found to be the most effective (31.4 ± 3.1 U g −1 ) at 10 U mL −1 of enzyme activity followed by BC-AS (24.3 ± 4.8 U g −1 ) and BC-PW (14.58 ± 3.3 U g −1 ). In addition, the biochars were functionalized with citric acid for possible surface modifications and the effect of biochars for the adsorption of enzymes has been investigated. Isotherm studies of enzyme loading onto biochar established homogeneous monolayer adsorption as the major mechanism. The desorption of laccase from all biochars followed pseudo-second-order model. Immobilized laccase exhibited superior storage ability and shelf-life which were three times higher than free laccase. Finally, the immobilized laccase was used for the degradation of micropollutant, DCF and near 100% removal was obtained within 5 h at an environmentally relevant concentration (500 μg L −1 ). [ABSTRACT FROM AUTHOR]

Published
2018
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