Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21805
Title: Photo-assisted degradation of 2,4,5-trichlorophenoxyacetic acid by Fe(II)-catalyzed activation of Oxone process : the role of UV irradiation, reaction mechanism and mineralization
Authors: Wang, YR
Chu, W 
Keywords: 2,4,5-Trichlorophenoxyacetic acid
Hydroxyl radical
Oxone
Sulfate radical
UV irradiation
Issue Date: 2012
Publisher: Elsevier
Source: Applied catalysis B : environmental, 2012, v. 123-124, p. 151-161 How to cite?
Journal: Applied catalysis B : environmental 
Abstract: In this study, the potential of Fe(II)-catalyzed activation of Oxone process with UV irradiation (FOU) for the degradation of 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) in aqueous solution was explored and compared with the Fe(II)/Oxone (FO) process. Experimental results show that the FO process was dramatically promoted upon the introduction of UV irradiation. As a result, the role of UV irradiation was elucidated in-depth by comparing the real-time of [Fe(II)] between the FO process and the FOU process. It was found that a beneficial Fe(III)/Fe(II) catalytic cycle is established in the presence of UV irradiation, thereby leading to the accelerated regeneration of Fe(II). Additionally, 2,4,5-T decay by the FOU process under various [Oxone] and [2,4,5-T] was also examined. Furthermore, the decay pathways for the transformation of 2,4,5-T by UV alone, Oxone/UV, and FOU processes were proposed by using LC-ESI/MS analysis. Distinct differences of intermediate distributions were observed among the three processes with or without the involvement of radicals (OH and SO 4 -). Besides, the efficiencies of various processes (i.e., UV alone, Oxone/UV and FOU) were further examined in terms of mineralization and Cl - ion accumulation.
URI: http://hdl.handle.net/10397/21805
ISSN: 0926-3373
EISSN: 1873-3883
DOI: 10.1016/j.apcatb.2012.04.031
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