Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 76, Issue 2, Pages 206-214Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2010.10.010
Keywords
Hydrodechlorination; Zerovalent iron; Nanoparticles; Chlorophenols (CPs); Palladium
Categories
Ask authors/readers for more resources
This study investigated dechlorination of 4-chlorophenol (4CP), 2,4-dichlorophenol (24DCP), and 2,4,6-trichlorophenol (246TCP) with Pd/Fe nanoparticles. The reaction rates were significantly faster than those achieved with Pt/Fe, Ni/Fe, Cu/Fe and Co/Fe nanoparticles. The chlorophenols (CPs) could be completely reduced to phenol by Pd/Fe following the pseudo-first-order kinetics, and the rates followed the order of 246TCP < 24DCP < 4CP. The 246TCP reduction rate with Pd/Fe increased with temperature and the estimated activation energy was 29.8 kJ/mol. The CPs dechlorination rate increased linearly with Pd loading, suggesting that Pd catalyst could be the only reactive site. Based on rigorous analysis of the transient formations and concentrations of various intermediates, a scheme of transformation pathways and the reaction mechanism was proposed to delineate 246TCP dechlorination to phenol. The influence of pH on the CPs dechlorination was investigated, and weak acidic condition is more favorable to the dechlorination reaction. H-2 evolution or iron corrosion rate initially followed the pseudo-first-order kinetics, and was reverted to the zero-order kinetics for prolonged reaction (>24 h). (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available