2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Studies on the removal of Cr (VI) from simulated wastewater using agricultural produce processing industry waste: a case study of rice husk

M. Bansal, U.K. Garg, D. Singh, V.K. Garg
Indian National Institute of Technology, IN

chromium (VI), rice husk, formaldehyde treated rice husk, adsorption isotherms

Investigation has been made to remove the chromium using low-cost potential adsorbents. For this purpose rice husk, an abundantly available agricultural produce processing industry waste, has been used after pre-treatments (boiling and formaldehyde treatment). The effect of pH, adsorbent dose, stirring speed, initial chromium, contact time and thermodynamic studies on the adsorption of Cr (VI) was studied in batch system. The adsorption process and extent of adsorption were dependent on the physical and chemical characteristics of the adsorbent, adsorbate concentration and process parameters. The sorption data fitted well with Langmuir adsorption model. The efficiencies of rice husk and formaldehyde treated rice husk for the removal of Cr (VI) were found to be 98.5 and 100% respectively for dilute solutions. The results revealed that the hexavalent chromium is significantly adsorbed on rice husk and the method could be used economically as an efficient technique for removal of Cr (VI) and purification of industrial wastewaters. FTIR and SEM were also evaluated before and after the adsorption to study the adsorbent surface morphology and contributing functional groups.

Nanotech 2008 Conference Program Abstract