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Article Dans Une Revue Processes Année : 2023

Efficient Decolorization of Azo Dye Orange II in a UV-Fe3+-PMS-Oxalate System

Résumé

The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+ concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•− played a crucial role in the decolorization of Orange II (85.8%), •OH was of secondary importance (9%), and 1O2 made a small contribution to the decolorization (5.2%). Furthermore, the formation of •OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.

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Chimie
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hal-04307663 , version 1 (26-11-2023)

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Yajie Wang, Xin Dong, Chengfeng Liu, Peng Cheng, Gilles Mailhot. Efficient Decolorization of Azo Dye Orange II in a UV-Fe3+-PMS-Oxalate System. Processes, 2023, 11 (3), pp.903. ⟨10.3390/pr11030903⟩. ⟨hal-04307663⟩
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