Mohamed E. MAHMOUD, Amr A. YAKOUT, Asmaa M. HALBAS, Maher M. OSMAN

Remediation of Cr(VI) via combined self-reduction and adsorption by chemicallymodi ed carbon sorbents

Hexavalent chromium, Cr(VI), is a highly toxic species, while trivalent chromium, Cr(III), is an essentialtrace element for humans and other organisms. In the present work, a simple, rapid, and efficient procedure for watertreatment of Cr(VI) is described. Active carbon (AC) was chemically treated with HCl and NaOH for the formation ofsurface modi ed Acidic-AC and Basic-AC sorbents, respectively. In addition, AC sorbent was treated with HNO3as anoxidizing agent and sodium sul te as a reducing agent for the formation of Ox-AC and Rd-AC sorbents, respectively. Themodi ed AC sorbents were tested to identify their potential applications in removal of Cr(VI) under various controllingfactors using the batch technique. The results indicated that these sorbents can be used in water treatment due totheir excellent and efficient reduction of Cr(VI) into Cr(III) with percentage transformation values in the range of 90%{100%. Acidic-AC was found to be the superior sorbent in the reduction process of Cr(VI). The produced Cr(III) wasremoved from aqueous solutions via adsorption on the surface of these sorbents. The reduction and adsorption processesof Cr(VI)-Cr(III) were evaluated and optimized under different experimental parameters. The potential applications ofthese sorbents in real water treatment were also explored.

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