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Removal of Cr and Mn from aqueous medium using bentonites and their derivatives

Abstract

Bentonite minerals of Rajmahal Hills and Hazaribagh district along with their derivatives have been used to remove hexavalent chromium and manganese from aqueous medium. Bentonites are smectite group of minerals having swelling power and cation exchange properties. Blue colour with benzidine solution indicates the presence of montmorillonite unit having SiO2, Al2O3, K2O, Fe2O3, FeO and traces of TiO2 also. The adsorption isotherm and removal performance of hexavalent chromium and manganese have been examined by shaking 100 mL 2 ppm solution with 1 gram of bentonite and their derivatives up to different intervals of time and also with varying amount of bentonite up to fixed time intervals. The percentage removal of chromium (VI) ranges from 12% to 67.7% whereas percentage removal of manganese (VII) varies from 09% to 92.5%. Experimental data showed that the removal of Cr (VI) and Mn (VII) represented both Freundlich and Langmuir adsorption isotherms. Adsorption of Cr (VI) and Mn (VII) on to bentonites and their derivatives follow first-order kinetics. It is concluded that locally available bentonites may be exploited as a low-cost feasible adsorbent for removal of Cr (VI) and Mn (VII) in the laboratory as well as industrial level too.

Graphic abstract

Bentonite minerals of Rajmahal Hills and Hazaribagh district along with their derivatives have been used to remove hexavalent chromium and manganese from aqueous medium. The adsorption isotherm and removal performance of hexavalent chromium and manganese have been examined by shaking 100 mL 2 ppm solution with 1 gram of bentonite and their derivatives up to different intervals of time and also with varying amount of bentonite up to fixed time intervals. Percentage removal of chromium (VI) ranges from 12% to 67.7% whereas percentage removal of manganese (VII) varies from 09% to 92.5%. Experimental data showed that removal of Cr (VI) and Mn (VII) represented both Freundlich and Langmuir adsorption isotherms.

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Acknowledgements

Authors acknowledge the laboratory facility provided by Central Institute of Mining and Fuel Research, a CSIR lab in Dhanbad for XRD tests under the supervision of Dr. K. K.Mishra. Thanks are also due to Prof. Bhabatosh Mandal, Dept. of Chemistry, Visvabharati, Santiniketan for providing FTIR analysis of the sample.

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Correspondence to Sourav Majumder.

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Majumder, S., Jha, A.K. Removal of Cr and Mn from aqueous medium using bentonites and their derivatives. J Chem Sci 132, 135 (2020). https://doi.org/10.1007/s12039-020-01838-6

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  • DOI: https://doi.org/10.1007/s12039-020-01838-6

Keywords

  • Isotherms
  • Bentonite
  • Langmuir
  • Adsorption
  • Hexavalent chromium