Department Of Environmental Science And Technology

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Author: search.filters.author.Kumar, Vijay

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    Multifunctional nanohybrid for simultaneous detection and removal of Arsenic(III) from aqueous solutions
    (Elsevier Ltd, 2021-12-01T00:00:00) Singh, Simranjeet; Khasnabis, Sutripto; Anil, Amith G.; Kumar, Vijay; Kumar Naik, TS Sunil; Nath, Bidisha; Garg, Vinod Kumar; Singh, Joginder; Ramamurthy, Praveen C.
    Herein, for the adsorption and detection of As (III), multifunctional nanohybrid have been synthesized using a solvothermal approach. Structural and functional characterizations confirmed the impregnation of the ZnO over graphene oxide. Nanohybrid exhibits a remarkable qmax (maximum adsorption capacity) of 8.17 mg/g, at an adsorbent dose of 3 g/L and pH of 8.23. Higher adsorption with nanohybrid was attributed to a large BET surface area of 32.950 m2/g. The chemical nature and adsorption behaviour of As(III) on ZnO-GO were studied by fitting the data with various adsorption isotherms (Langmuir & Freundlich) and kinetics models (six models). It is observed from the findings that removal of As(III) with ZnO-GO nanocomposite appears to be technically feasible with high removal efficiency. The feasibility of the nanocomposite to function as a sensor for the detection of As(III) was also evaluated. The fabricated sensor could detect As(III) with a lower limit of detection of 0.24 ?M and linear range up to 80 ?M. Overall, this study is significant in nanohybrid as a multifunctional composite for the adsorption and detection of As (III) from wastewater. � 2021 Elsevier Ltd
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    Biodegradation of monocrotophos by indigenous soil bacterial isolates in the presence of humic acid, Fe (III) and Cu (II) ions
    (Elsevier Ltd, 2021-07-20T00:00:00) Singh, Simranjeet; Singh, Joginder; Ramamurthy, Praveen C.; Kumar, Vijay; Bhardwaj, Sonali; Garg, Vinod Kumar
    Three bacteria, namely Streptomyces sp. MCP1, Rhizobium leguminosarum MCP2 and Bacillus subtilis MCP3, isolated from an arable field, have been used for the biodegradation of monocrotophos (MCP). The bacterial strains were characterized based on the 16S rRNA gene sequence. MCP was subjected to biological degradation in two ways, i.e., with or without using Fe(III), Cu(II), and humic acid (HA). The isolates were capable of degrading MCP in an order: MCP2 (Bacillus subtilis) > MCP1 (Streptomyces sp.) > MCP3 (Rhizobium leguminosarum). With the application of Cu(II) and Fe(III), the biodegradation of MCP was from 83 to 92% and 78 to 87%, respectively. Altogether, under different conditions, the order of inhibition of MCP biodegradation was apparently as HA > Fe(III) > Cu(II). Mass spectrometric and UV�visible spectrophotometric results showed that MCP biodegradation's only pathway included major intermediatory metabolites (E) 4-amino-4-oxobut-2-en-2-yl dimethyl phosphate, dimethyl phosphate, methyl hydrogen phosphate and phosphonate. � 2021 Elsevier Ltd
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    Toxicity and detoxification of monocrotophos from ecosystem using different approaches: A review
    (Elsevier Ltd, 2021-02-23T00:00:00) Singh, Simranjeet; Kumar, Vijay; Kanwar, Ramesh; Wani, Abdul Basit; Gill, Jatinder Pal Kaur; Garg, Vinod Kumar; Singh, Joginder; Ramamurthy, Praveen C.
    Monocrotophos (MCP) is an organophosphate insecticide with broad application in agricultural crops like rice, maize, sugarcane, cotton, soybeans, groundnut and vegetables. MCP solubilize in water readily and thus reduced sorption occurs in soil. This leads to MCP leaching into the groundwater and pose a significant threat of contamination. The MCP's half-life depends on the temperature and pH value and estimated as 17�96 d. But the half-life of technical grade MCP can exceed up to 2500 days if properly stored at 38 �C in a glass or polyethylene container in a stable condition. It causes abnormality, ranging from mild to severe confusion, agitation, hypersalivation, convulsion, pulmonary failure, senescence in mammals and insects. MCP affects humans by inhibiting the activity of the acetylcholine esterase enzyme. MCP is accountable for the catalytic degradation of acetylcholine and affects the neurotransmission between neurons. This review discusses MCP's various aspects and fate on aquatic and terrestrial life forms, quantification methods for monitoring, various degradation processes, and their mechanisms. Different case studies related to its impact on the human population in different parts of the world have been discussed. Efforts have also been made to summarize and present different microbial population's role in its degradation and mineralization. � 2021 Elsevier Ltd