Department Of Environmental Science And Technology

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Author: search.filters.author.Singh, SimranjeetSubject: search.filters.subject.Kinetics

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    A novel CaO nanocomposite cross linked graphene oxide for Cr(VI) removal and sensing from wastewater
    (Elsevier Ltd, 2022-04-27T00:00:00) Singh, Simranjeet; Naik, T.S. Sunil Kumar; Anil, Amith G.; Khasnabis, Sutripto; Nath, Bidisha; U, Basavaraju; Kumar, Vineet; Garg, V.K.; Subramanian, S.; Singh, Joginder; Ramamurthy, Praveen C.
    A novel green nanocomposite has been prepared by immobilizing CaO nanoparticles (CaO NPs) on the surface of graphene oxide. Biogenic CaO-NPs were synthesized from Lala clamshells. Morphological and structural characterizations of the nanocomposite were studied extensively. The adsorption capacity (qmax) of the nanocomposite for removing Cr(VI) was 38.04 mg g?1. In addition to this, the adsorption data were adequately simulated with Langmuir, Freundlich, Temkin, and pseudo-second-order models, suggesting that the adsorption process was the combination of external mass transfer and chemisorption. Electrostatic interaction was the dominant mechanism for Cr(VI) removal. In addition, the synthesized nanocomposites also serve as an excellent sensor for Cr(VI) sensing, with a limit of detection (LOD) of 0.02 ?M utilizing electrochemical methods. Therefore, this green nanocomposite can simultaneously serve as an adsorbent and sensor for Cr(VI)removal from aqueous solutions. � 2022 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