Title

The Use Of Mechanical Alloying For The Preparation Of Palladized Magnesium Bimetallic Particles For The Remediation Of Pcbs

Keywords

Ball-milling; Dechlorination; Mechanical alloying; Mg/Pd bimetal; Polychlorinated biphenyls

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-μm-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 3min resulted in a degradation rate of 0.00176min -1g -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 23min with 16 ball bearings yielded the most reactive bimetal with a degradation rate of 0.00122min -1g -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. © 2011 Elsevier B.V.

Publication Date

9-15-2011

Publication Title

Journal of Hazardous Materials

Volume

192

Issue

3

Number of Pages

1380-1387

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jhazmat.2011.06.052

Socpus ID

80052034898 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052034898

This document is currently not available here.

Share

COinS