Visible-light photocatalysis accelerates As(III) release and oxidation from arsenic-containing sludge
作者： Hongbo Lu , Xueming Liu , Feng Liu , Zhengping Hao , Jing Zhang
DOI: 10.1016/J.APCATB.2019.03.020
关键词: Arsenic sulfide 、 Ion chromatography 、 Arsenic 、 Radical 、 Sulfur 、 Dissolution 、 Hydroxide 、 Inorganic chemistry 、 Photocatalysis 、 Chemistry
摘要: Arsenic containing sludge, a product of the treatment acid smelting wastewater, is susceptible to temperature, pH, co-existing salt ions and organic matter, which might lead release arsenic into environment. Here, we studied effect visible light on dissolution oxidation sulfide sludge (ASS) sampled from plant. Results show that by exposure light, both As(III) ASS As(V) were markedly accelerated. Electron paramagnetic resonance (EPR) free radical quenching experiments revealed acts as semiconductor photocatalyst produce hydroxide superoxide radicals under light. At pH 7 11, are directly accelerated O2¯. 3, promoted O2¯ OH, while mainly controlled OH. In addition, solid phase was transformed sulfur (S8) favored aggregation precipitation sludge. The transformation affected generation intermediate species sulfur-containing radicals, determined ion chromatography low-temperature EPR, respectively. A photocatalytic oxidation-based model proposed underpin behavior conditions. This study helps predict fate deposited in environment range natural engineered settings.
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