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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 30, 2015
Accepted March 15, 2016

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kinetic, thermodynamic and equilibrium studies on removal of hexavalent chromium from aqueous solutions using agro-waste biomaterials, casuarina equisetifolia L. and sorghum bicolor

Mokkapati Ramya Prasanthi Mokkapati Jayasravanthi¹ Ratnakaram Venkata Nadh^2†

Department of Chemistry, ANUCET, Acharya Nagarjuna University, Guntur - 522510, India ¹Department of Biotechnology, Acharya Nagarjuna University, Guntur - 522510, India ²GITAM University - Bengaluru Campus, Karnataka - 561 203, India

Korean Journal of Chemical Engineering, August 2016, 33(8), 2374-2383(10), 10.1007/s11814-016-0078-6

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Abstract

Removal of Cr(VI) by biosorption on two agro waste materials, casuarinas fruit powder (CFP) and sorghum stem powder (SSP), has been investigated. The prepared adsorbent materials were characterized by SEM, EDX, FTIR and BET. These biomaterials effectively removed Cr(VI) with a maximum removal of 93.35% and 63.75% using 15 gL-1 and 5 gL-1 of CFP and SSP, respectively, at 60 ℃ with 20mgL-1 initial Cr(VI) concentration in solution. In both cases of adsorbents, kinetic data of adsorption fitted well in pseudo-second-order in terms of correlation coefficient (R2). This helps in proposing the process of adsorption as chemical coordination, which is correlated with the thermodynamic study results conducted at different values of temperature. Langmuir, Freundlich and D-R models were evaluated for description of metal sorption isotherms. Values of coefficients of intra-particle diffusion and mass transfer have also been determined at different values of temperature.

Keywords

Casuarinas Fruit Powder Sorghum Stem Powder Removal Chromium Adsorption