Graphene: A Reusable Substrate for Unprecedented Adsorption of Pesticides

Authors

  • Shihabudheen M. Maliyekkal,

    1. DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India, Fax: 91-44-2257-0545/0509
    2. School of Mechanical and Building Sciences, VIT University, Chennai Campus, Chennai-600 127, India
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  • T. S. Sreeprasad,

    1. DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India, Fax: 91-44-2257-0545/0509
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  • Deepti Krishnan,

    1. DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India, Fax: 91-44-2257-0545/0509
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  • Summayya Kouser,

    1. Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560 064, India
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  • Abhishek Kumar Mishra,

    1. Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560 064, India
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  • Umesh V. Waghmare,

    Corresponding author
    1. Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560 064, India
    • Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560 064, India.
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  • T. Pradeep

    Corresponding author
    1. DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India, Fax: 91-44-2257-0545/0509
    • DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai - 600 036, India, Fax: 91-44-2257-0545/0509
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Abstract

Unprecedented adsorption of chlorpyrifos (CP), endosulfan (ES), and malathion (ML) onto graphene oxide (GO) and reduced graphene oxide (RGO) from water is reported. The observed adsorption capacities of CP, ES, and ML are as high as ∼1200, 1100, and 800 mg g−1, respectively. Adsorption is found to be insensitive to pH or background ions. The adsorbent is reusable and can be applied in the field with suitable modifications. A first-principles pseudopotential-based density functional analysis of graphene–water–pesticide interactions showed that the adsorption is mediated through water, while direct interactions between graphene and the pesticides is rather weak or unlikely.

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