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Appl. Sci. 2018, 8(4), 615; https://doi.org/10.3390/app8040615

Photooxidation of p-Arsanilic Acid in Aqueous Solution by UV/Persulfate Process

1
Department of Environmental Science, School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
2
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
3
Institute of Chemical Kinetics and Combustion, Institutskaya 3, 630090 Novosibirsk, Russia
4
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russia
5
School of Civil Engineering, Wuhan University, Wuhan 430072, China
*
Authors to whom correspondence should be addressed.
Received: 26 February 2018 / Revised: 30 March 2018 / Accepted: 4 April 2018 / Published: 13 April 2018
(This article belongs to the Section Chemistry)
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Abstract

Used as a kind of feed additive, p-arsanilic acid can pose a potential risk to organisms when abandoned in the environment. The photodegradation of p-ASA was investigated under UV-C irradiation in the presence of persulfate (PS) in this work. The addition of PS facilitated the decomposition of p-ASA and notably, the presence of 50 mmol PS brought about a nearly complete mineralization after 3 h, while an insignificant total organic carbon (TOC) removal was observed under UV irradiation (λ = 254 nm) only. Experimental results proved that sulfate radical (SO4) was responsible for the promotion effect. The cleavage of As-C bond released inorganic arsenic and caused the occurrence of various organic products, for example, hydroxybenzaldehyde, nitrobenzene, benzenediol sulfate, and biphenylarsinic acid. The application of PS with UV-C light may throw a light on thorough treatment for p-ASA containing wastewater. View Full-Text
Keywords: p-arsanilic acid; photodegradation; UV/persulfate system; sulfate radical p-arsanilic acid; photodegradation; UV/persulfate system; sulfate radical
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Shen, X.; Xu, J.; Pozdnyakov, I.P.; Liu, Z. Photooxidation of p-Arsanilic Acid in Aqueous Solution by UV/Persulfate Process. Appl. Sci. 2018, 8, 615.

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