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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

Paper ID Volume ID Publish Year Pages File Format Full-Text
46133 46430 2012 11 PDF Available
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
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 SO4−). 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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Photo-assisted Fe(II)-catalyzed decomposition of Oxone process (FOU) was explored. ▸ Elucidated the role of UV by comparing real-time of [Fe(II)] between FO and FOU. ▸ Excellent performance of FOU is due to synergistic effect among Oxone, Fe2+ and UV. ▸ Decay pathways of 2,4,5-T by UV alone, UV/Oxone, and FOU were proposed.

Keywords
2,4,5-Trichlorophenoxyacetic acid; Oxone; Hydroxyl radical; Sulfate radical; UV irradiation
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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
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 151–161
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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