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Appl. Sci. 2018, 8(4), 615;

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

Department of Environmental Science, School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
Institute of Chemical Kinetics and Combustion, Institutskaya 3, 630090 Novosibirsk, Russia
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russia
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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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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