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Title: Experimental Studies on Cr VI Removal from Wastewater by Adsorption using Pig Iron Sludge and Biochar
Researcher: Surendran, G.
Guide(s): Baral, Saroj Sundar
Keywords: Chemical Engineering, Cr(VI) Removal, Pig Iron Sludge, Biochar
University: Birla Institute of Technology and Science
Completed Date: 2016
Abstract: The present study explores the use of easily available natural and industrial adsorbents for the treatment of Cr(VI) contaminated wastewater. In the initial part of the study, Cr(VI) adsorption studies have been carried out using two representative bio-sorbent viz Sorghastrum Nutans L. Nash and Cocos Nucifera. The effect of various parameters such as initial pH of adsorbate solution, initial concentration of Cr(VI), dosage, time and particle size has been studied. The adsorbent Sorghastrum Nutans L. Nash was characterized before and after adsorption using FTIR, SEM, EDAX, and XRD analysis. Among different functional groups present in the adsorbent, OH bending, CN stretching/bending and NH stretching plays a major role in Cr(VI) adsorption. Batch experiments shows that adsorption coupled reduction i.e. indirect reduction is the mechanism of Cr(VI) removal by the biomaterial. Adsorbent surface became highly positively charged at lower pH, adsorption rate of Cr(VI) is faster and reduction reaction also accelerates at lower pH since, the binding of negatively charged Cr(VI) ion species to the cationic groups is enhanced and protons take part in this reaction. newlineIn case of Sorghastrum Nutans L. Nash, it was observed that the adsorption capacity was high at pH 1 whereas, the adsorption capacity was very low at higher pH. In case of Cocos Nucifera, the adsorption capacity was significantly high at higher pH as compared to Sorghastrum Nutans L. Nash. However, in both the cases, the effluent pH was highly acidic and hence required further neutralization steps which may not be economical. Further, these adsorbents in their present form cannot be regenerated or recycled for industrial use. In addition, the water-soluble compounds present in the bio-sorbents can leach-out to the effluent which may create further environmental problem. newlineTo overcome the above problem, pig iron sludge is explored as an adsorbent for the treatment of Cr(VI) contaminated wastewater. From the batch adsorption experiments it was observed that, the upt
Pagination: 149p.
Appears in Departments:Chemical Engineering

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