Volume 3, Issue 2

Removal of Hexavalent Chromium from Aqueous Solutions using Sawdust as a low Cost Adsorbent

Author

Minakshi1, C.P.Kaushik1 and Sandeep Arya2*

Abstract

In the present study, adsorbent is prepared from Delbergia sissoo, and used for Cr (VI) removal from aqueous solutions. Adsorbent is activated with the use of concentrated sulphuric acid. The adsorption of chromium (VI) from aqueous solutions by activated sawdust was studied under a batch and column mode and was demonstrated that the adsorbent prepared from sawdust has a significant capacity for adsorption of Cr (VI) from aqueous solution. The influence of pH, contact time, adsorbent dose and initial concentration of Cr (VI) on the chromium removal was investigated under the batch studies. Adsorption of Cr (VI) is highly pH-dependent and the results indicate that the optimum pH for the removal is 2. In column studies maximum removal was found at bed height 10 cm and flow rate of 1 ml/min. The capacity of chromium adsorption at equilibrium by these natural wastes increased with absorbent concentration. The suitability of adsorbents was tested with Langmuir and Freundlich isotherms and their constants were evaluated.

DOI

https://doi.org/10.62226/ijarst20140222

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