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Performance of acid-activated water caltrop (Trapa natans) shell in fixed bed column for hexavalent chromium removal from simulated wastewater

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Abstract

The current study deals with the adsorption of hexavalent chromium using acid (H3PO4)-activated water caltrop (Trapa natans) shell (PWCS) using an up-flow packed bed column. Characteristics of breakthrough curve was obtained by investigating the effect of several operating parameters viz. inlet flow rate (2–6 mL/min), initial metal ion concentration (50–150 mg/L), and adsorbent’s column bed height (1–3 cm). Elevated time of breakthrough curve was reported with elevated adsorbent bed height and vice versa with enhanced initial metal concentration and inlet flow rate of sorbate solution. Process design and breakthrough curves under varying conditions were predicted by applying column models like Thomas model, Adams–Bohart model, Yoon Nelson model, and bed depth service Time (BDST). Column behavior was better described by the BDST and Thomas model and simultaneously gave a good fit with the experimental data of breakthrough curves. The percentage removal for Cr(VI) from aqueous solution having pH 2 and temperature 303.15 K was observed to be 52.46%. The maximum adsorption capacity was found to be 87.31 mg/g according to the Thomas model. Conclusively, phosphoric acid–modified T. natans shell (PWCS) showed better sorption potential for of Cr(VI) species from simulated wastewater.

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Acknowledgments

The authors are grateful to the Department of Chemical Engineering and Department of Bioscience and Bioengineering, Indian Institute of Technology Guwahati, for providing the necessary facilities for this research work. The authors also acknowledge the Central Instrument Facilities (CIF), Indian Institute of Technology Guwahati, for characterization of the adsorbent.

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Correspondence to Prasanna Venkatesh Rajaraman.

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Responsible editor: Ioannis A. Katsoyiannis

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Kumar, S., Patra, C., Narayanasamy, S. et al. Performance of acid-activated water caltrop (Trapa natans) shell in fixed bed column for hexavalent chromium removal from simulated wastewater. Environ Sci Pollut Res 27, 28042–28052 (2020). https://doi.org/10.1007/s11356-020-09155-8

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  • DOI: https://doi.org/10.1007/s11356-020-09155-8

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