Abstract
Soil and water pollution by chromium is a major environmental concern. While existence of chromium in + 3 state is considered benign, it's presence in the + 6 state poses an environmental concern. Hence reduction of Cr(VI) to Cr(III) is considered as a satisfactory environmental solution to mitigate chromium contamination. The oxidation of a metal substrate can be enhanced by depositing small amount of nobler metal on its surface. The present study hence examines the efficiency of Cr (VI) reduction upon deposition of copper (oxidation potential: −0.34 V) on the surface of (zero valent iron) ZVI (oxidation potential: 0.04 V) particles. Batch experiments and pH and Eh measurements revealed that presence of copper loading on ZVI particles increases the efficiency of Cr(VI) reduction by 11 to 233 % in relation to the uncoated ZVI particles owing to enhanced electron activity and release of hydroxyl ions that converted Cr (VI) to mixed Fe-Cr oxide. The Cr (VI) reduction is accomplished in periods ranging from 60 to 240 min in the batch experiments and obeyed the pseudo first or second order kinetics.
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