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Mitigation of cromium contamination by copper-ZVI bimetallic particles

Pal, Rama, Rao, Sudhakar M. and Sadasivam, Siva 2013. Mitigation of cromium contamination by copper-ZVI bimetallic particles. Journal of Hazardous, Toxic, and Radioactive Waste 17 (3) , pp. 181-186. 10.1061/(ASCE)HZ.2153-5515.0000169

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/2153-5493/ (accessed 25/02/2014)
Publisher: American Society of Civil Engineers
ISSN: 2153-5493
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 04:57
URI: http://orca.cf.ac.uk/id/eprint/46737

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