Concurrent oxidation and reduction of pentachlorophenol by bimetallic zerovalent Pd/Fe nanoparticles in an oxic water

Yang-hsin Shih; Meng-yi Chen; Yuh-fan Su; Chih-ping Tso

doi:10.1016/j.jhazmat.2015.08.059

Concurrent oxidation and reduction of pentachlorophenol by bimetallic zerovalent Pd/Fe nanoparticles in an oxic water

J Hazard Mater. 2016 Jan 15:301:416-23. doi: 10.1016/j.jhazmat.2015.08.059. Epub 2015 Aug 31.

Authors

Yang-hsin Shih¹, Meng-yi Chen², Yuh-fan Su², Chih-ping Tso²

Affiliations

¹ Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan. Electronic address: yhs@ntu.edu.tw.
² Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan.

PMID: 26410270
DOI: 10.1016/j.jhazmat.2015.08.059

Abstract

Under the oxic condition, the most effective removal of pentachlorophenol (PCP) with Pd/Fe nanoparticles (NPs) is demonstrated as compared to the anoxic condition. Concurrent oxidation and reduction of polychlorinated compounds such as PCP by zerovalent Pd/Fe were first observed. The optimal Pd content of the bimetallic NPs is only around 0.54 mg g(-1) Fe. Increases in both dosage of Pd/Fe NPs and temperature enhance degradation rates and efficiency. The activation energy of 29 kJ/mol indicates that the degradation is a surface-mediated mechanism. The removal mechanism also includes adsorption, which explains that the dechlorination of Cl on PCP molecules at ortho and meta positions is easier than that at para position. Overall, Pd/Fe NPs can apply directly to degrade polyhalogenated compounds in water without deaeration.

Keywords: Activation energy; Adsorption; Dechlorination; Mineralization; Pd/Fe nanoparticles.

Publication types

Research Support, Non-U.S. Gov't