Abstract
AbstractThe present study deals with the adsorption of Cr(VI) in a series of carbons prepared from bagacillo, which is a lignocellulosic by‐product from a sugar milling operation. Activated carbons were prepared by chemical activation using ZnCl2, CaCl2, H3PO4 and Ca(OH)2 and physical activation with steam and carbon dioxide. The effects of the chemical nature and the pore structures on the adsorption behaviour of these activated carbons were investigated. The functional groups present on the surface of the carbons were differentiated and related to the observed adsorption behaviour of the carbons. It appears that adsorption is strongly influenced by the pH of the carbon, where acidic functional groups appear to enhance the adsorption behaviour. Fine micropore structures appear to exhibit a molecular sieve effect. Restrictive pores, present in carbons with high surface areas, appear to inhibit the access of Cr(VI) into the micropore structures resulting in low adsorption.
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