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.
Highlights
Chemicals and ReagentsArsanilic acid (p-ASA, purity, 98%) was purchased from Aladdin Industrial Corporation (Shanghai, China)
Introduction p-Arsanilic acid (p-ASA), a kind of organoarsenic feed additives, are utilized worldwide in order to promote the growth of animals and prevent diseases [1,2,3]
Rapid degradation of pArsanilic acid (p-ASA) during UV irradiation treatment is accompanied with a weak decrease of total organic carbon (TOC) [13,14,15], an indicator of the severity of organic pollution [18], suggesting a negligible mineralization and the accumulation of aromatic by-products [13,19] with questionable toxicity
Summary
Arsanilic acid (p-ASA, purity, 98%) was purchased from Aladdin Industrial Corporation (Shanghai, China). Methanol (HPLC grade) was purchased from Fisher Chemical. All the other reagents were analytical grade and purchased from Sinopharm Chemical Reagent Co., Ltd. Deionized water (JiBaiRui, Wuhan, China) was used for preparation of solutions
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