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Catalysts 2016, 6(7), 105; doi:10.3390/catal6070105

Enhancement of Degradation and Dechlorination of Trichloroethylene via Supporting Palladium/Iron Bimetallic Nanoparticles onto Mesoporous Silica

Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Author to whom correspondence should be addressed.
Academic Editor: John R. (JR) Regalbuto
Received: 15 March 2016 / Revised: 9 June 2016 / Accepted: 24 June 2016 / Published: 19 July 2016
(This article belongs to the Special Issue Rational Synthesis of Supported Bimetallic Catalysts)
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Abstract

This study is aimed to prevent the agglomeration of Pd/Fe bimetallic nanoparticles and thus improve the efficiency toward degradation and dechlorination of chlorinated organic contaminants. A mesoporous silica with a primary pore diameter of 8.3 nm and a specific surface area of 688 m2/g was prepared and used as the host of Pd/Fe nanoparticles. The Pd/Fe nanoparticles were deposited onto or into the mesoporous silica by reduction of ferrous ion and hexachloropalladate ion in aqueous phase. Batch degradation and dechlorination reactions of trichloroethylene were conducted with initial trichloroethylene concentration of 23.7 mg/L, iron loading of 203 or 1.91 × 103 mg/L and silica loading of 8.10 g/L at 25 °C. Concentration of trichloroethylene occurs on the supported Pd/Fe nanoparticles, with trichloroethylene degrading to 56% and 59% in 30 min on the supported Pd/Fe nanoparticles with weight percentage of palladium to iron at 0.075% and 0.10% respectively. The supported Pd/Fe nanoparticles exhibit better dechlorination activity. When the supported Pd/Fe nanoparticles with a weight percentage of palladium to iron of 0.10% were loaded much less than the bare counterpart, the yield of ethylene plus ethane in 10 h on them was comparable, i.e., 19% vs. 21%. This study offers a future approach to efficiently combine the reactivity of supported Pd/Fe nanoparticles and the adsorption ability of mesoporous silica. View Full-Text
Keywords: Pd/Fe bimetallic nanoparticles; mesoporous silica; trichloroethylene; adsorption; concentration; degradation; dechlorination Pd/Fe bimetallic nanoparticles; mesoporous silica; trichloroethylene; adsorption; concentration; degradation; dechlorination
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MDPI and ACS Style

Wei, J.; Qian, Y.; Wang, L.; Ge, Y.; Su, L.; Zhai, D.; Wang, J.; Wang, J.; Yu, J. Enhancement of Degradation and Dechlorination of Trichloroethylene via Supporting Palladium/Iron Bimetallic Nanoparticles onto Mesoporous Silica. Catalysts 2016, 6, 105.

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