- Title
- Degradation of azo dye with activated peroxygens: when zero-valent iron meets chloride
- Creator
- Wang, Zhaohui; Ai, Luoyan; Huang, Ying; Zhang, Juekai; Li, Sitong; Chen, Jiawei; Yang, Fei
- Relation
- RSC Advances Vol. 7, Issue 49, p. 30941-30948
- Publisher Link
- http://dx.doi.org/10.1039/c7ra03872k
- Publisher
- Royal Society of Chemistry
- Resource Type
- journal article
- Date
- 2017
- Description
- Degradation of acid orange 7 (AO7) by Fe⁰-based Advance Oxidation Process (AOPs) with common peroxygens, persulfate (PS), peroxymonosulfate (PMS) and hydrogen peroxide (H₂O₂), was investigated, in which sulfate radicals (SO₄·-) and/or hydroxyl radicals (·OH) are powerful oxidizing species. The effects of Fe⁰ dosage, peroxygen concentration, initial pH and the presence of chloride on the degradation of AO7 were examined. The AO7 degradation efficiencies by four systems, including Fe⁰, Fe⁰/H₂O₂, Fe⁰/PMS and Fe⁰/PS were compared. AO7 degradation rate by Fe⁰ activated AOPs in descending order is H₂O₂ ≧ PS > PMS. Increasing acidity and iron dosage favored a rapid degradation of AO7. The presence of chloride greatly inhibited dye removal in Fe⁰/H₂O₂ and Fe⁰/PS systems, whilst accelerated dye degradation was observed in the Fe⁰/PMS system. In contrast, mineralization of AO7 in the Fe⁰/PMS/Cl- system was minimal, because of formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are useful for selecting the most appropriate technology for textile wastewater treatment, depending on the wastewater constituents and pH.
- Subject
- acid orage; azo dye; advance oxidation process; iron; chloride
- Identifier
- http://hdl.handle.net/1959.13/1385186
- Identifier
- uon:32188
- Identifier
- ISSN:2046-2069
- Rights
- This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
- Language
- eng
- Full Text
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