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Synthesis, characterization and application of xanthated Diospyros kaki (persimmon) leaves for the treatment of chemical and biological contaminants in aqueous solutions

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Abstract

In this research, a one-step xanthation process was used to synthesize biosorbents from persimmon leaves (Diospyros kaki). The resulting biosorbents, referred to as MPM, exhibited high sorption capacities for Hexavalent chromium and Cd(II) at different pH values. Specifically, at pH 3, the Langmuir maximum adsorption capacity for Cr(VI)-MPM was determined to be 710 mg/g, while at pH 7, it was 622 mg/g for Cd(II)-MPM systems. The adsorption kinetics of both the metal ions followed the pseudo-2nd-order model, with R2 values close to 1 (0.99). Through FT-IR and XPS studies, it was determined that ion exchange, surface complexation, and chelation were the primary mechanisms responsible for removing the analytes from water using MPM as sorbent. The presence of the -CS2-Na group in MPM played a crucial role in these removal mechanisms. Additionally, MPM displayed notable antibacterial efficacy against S. aureus and E. coli. Considering its rapid kinetics, wide pH range applicability, impressive sorption capacity, recyclability, and effective antibacterial properties, MPM proves to be a highly suitable adsorbent for removing Hexavalent chromium and Cd(II) from industrial wastewater.

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Acknowledgements

Department of Chemistry, Banasthali Vidyapith, Rajasthan, and Thematic Unit of Excellence on Soft Nanofabrication, Advance Centre for Material Science, and Advanced Imaging Centre at IIT Kanpur are acknowledged for various characterization studies.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Chemistry, Banasthali Vidyapith, Banasthali, India

    Sanjana Tewari & Jaya Dwivedi

  2. Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, Uttar Pradesh, India

    Neha Singh & Nalini Sankararamakrishnan

  3. Department of Chemistry, School of Sciences, IFTM University, Moradabad, Uttar Pradesh, India

    Sanjana Tewari

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  1. Sanjana Tewari
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Contributions

Nalini Sankararamakrishnan: Conceptualization, Methodology, Visualization, Investigation, Supervision, Writing—original draft, review & editing. Neha Singh: Data curation, Investigation, Writing – original draft, review & editing. Sanjana Tewari: Data curation, Investigation, Validation Writing—review & editing. Jaya Dwivedi: Data Validation.

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Correspondence to Nalini Sankararamakrishnan.

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Tewari, S., Singh, N., Dwivedi, J. et al. Synthesis, characterization and application of xanthated Diospyros kaki (persimmon) leaves for the treatment of chemical and biological contaminants in aqueous solutions. Adsorption (2024). https://doi.org/10.1007/s10450-024-00470-x

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