Title

The use of mechanical alloying for the preparation of palladized magnesium bimetallic particles for the remediation of PCBs

Authors

Authors

J. L. Coutts; R. W. Devor; B. Aitken; M. D. Hampton; J. W. Quinn; C. A. Clausen;C. L. Geiger

Comments

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Abbreviated Journal Title

J. Hazard. Mater.

Keywords

Mg/Pd bimetal; Polychlorinated biphenyls; Dechlorination; Mechanical; alloying; Ball-milling; POLYCHLORINATED-BIPHENYLS; RAPID DECHLORINATION; DEGRADATION; IRON; CONGENERS; SYSTEMS; SURFACE; PD/FE; MG/PD; Engineering, Environmental; Engineering, Civil; Environmental Sciences

Abstract

The kinetic rate of dechlorination of a polychlorinated biphenyl (PCB-151) by mechanically alloyed Mg/Pd was studied for optimization of the bimetallic system. Bimetal production was first carried out in a small-scale environment using a SPEX 8000M high-energy ball mill with 4-mu m-magnesium and palladium impregnated on graphite, with optimized parameters including milling time and Pd-loading. A 5.57-g sample of bimetal containing 0.1257% Pd and ball milled for 3 min resulted in a degradation rate of 0.00176 min(-1) g(-1) catalyst as the most reactive bimetal. The process was then scaled-up, using a Red Devil 5400 Twin-Arm Paint Shaker, fitted with custom plates to hold milling canisters. Optimization parameters tested included milling time, number of ball bearings used, Pd-loading, and total bimetal mass milled. An 85-g sample of bimetal containing 0.1059% Pd and ball-milled for 23 min with 16 ball bearings yielded the most reactive bimetal with a degradation rate of 0.00122 min(-1) g(-1) catalyst. Further testing showed adsorption did not hinder extraction efficiency and that dechlorination products were only seen when using the bimetallic system, as opposed to any of its single components. The bimetallic system was also tested for its ability to degrade a second PCB congener, PCB-45, and a PCB mixture (Arochlor 1254); both contaminants were seen to degrade successfully. (C) 2011 Elsevier B.V. All rights reserved.

Journal Title

Journal of Hazardous Materials

Volume

192

Issue/Number

3

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

1380

Last Page

1387

WOS Identifier

WOS:000295236800058

ISSN

0304-3894

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