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2,4‐Dichlorophenol Degradation by an Integrated Process: Photoelectrocatalytic Oxidation and E‐Fenton Oxidation
Author(s) -
Zhao B. X.,
Li X. Z.,
Wang P.
Publication year - 2007
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/2006-09-05-ra-1030
Subject(s) - 2,4 dichlorophenol , anode , cathode , degradation (telecommunications) , aqueous solution , chemistry , electrode , advanced oxidation process , graphite , inorganic chemistry , chemical engineering , catalysis , organic chemistry , telecommunications , genetics , bacteria , computer science , engineering , biology
A new reactor system was designed for an integrated process involving photoelectrocatalytic oxidation (PECO) and electro‐Fenton (E‐Fenton) oxidation. Its efficiency was evaluated in terms of 2,4‐dichlorophenol (2,4‐DCP) degradation in aqueous solution. In this process, a TiO 2 electrode and an iron (Fe) electrode were used as anodes in parallel, while graphite felt (GF) was used as a cathode. When an electrical current is applied between the anodes and the cathode, the iron anode can release Fe 2+ and the GF cathode can generate H 2 O 2 continuously in the reaction solution. Under UV‐A illumination, while a H 2 O 2 ‐assisted PECO reaction occurs on the surface of the TiO 2 photo anode, an E‐Fenton reaction takes place in the solution. The experimental results demonstrated that 2,4‐DCP degradation in aqueous solution was greatly enhanced because of the interaction between the two types of reactions. Moreover, the effect of pH as an important factor was investigated. It was found that the combined reaction becomes less pH sensitive than the typical E‐Fenton reaction and may be suitable for application in a wide pH range.