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UV-Light-Induced Aggregation of Arsenic and Metal Sulfide Particles in Acidic Wastewater: The Role of Free Radicals
Kong, Linghao; Peng, Xianjia; Hu, Xingyun; Chen, Jingyi; Xia, Zhilin
2018-09-18
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume52Issue:18Pages:10719-10727
AbstractThe removal of arsenic and metals by sulfide (S(-II)) from acidic wastewater is an efficient method. However, the small sulfide particles formed in such a process make solid-liquid separation difficult, which greatly hinders its application. This study investigated the aggregation behavior of different sulfide particles (As2S3, CuS and CdS) under ultraviolet (UV) irradiation. In the dark, the aggregation rate of the arsenic sulfide (As2S3) particles was extremely slow. However, under UV irradiation, the growth of the As2S3 particles was significantly enhanced. A possible mechanism of UV-light-induced aggregation of As2S3 particles was proposed. The HS center dot and center dot OH radicals formed by a series of photochemical reactions can efficiently attack the S(-II) in the As2S3 particle, leading to the formation of an intermediate species, [As2S2-S center dot](+). Then, two [As2S2-S center dot](+) species combine to form [As2S2-S-S-S2As2](2+). The formation of [As2S2-S-S-S2As2](2+) results in the attenuation of the electronegativity and the rapid aggregation of the sulfide particles. In addition, the small S-0 particles generated in irradiated As2S3 system can efficiently coalesce into As2S3 particles. The CuS and CdS particles should have similar aggregation mechanisms. This study proposed a potential method for sulfide particle aggregation and provided a theoretical foundation for the development and application of UV-light-induced sulfide particle aggregation technology.
Department中国科学院饮用水科学与技术重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/41435
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Kong, Linghao,Peng, Xianjia,Hu, Xingyun,et al. UV-Light-Induced Aggregation of Arsenic and Metal Sulfide Particles in Acidic Wastewater: The Role of Free Radicals[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(18):10719-10727.
APA Kong, Linghao,Peng, Xianjia,Hu, Xingyun,Chen, Jingyi,&Xia, Zhilin.(2018).UV-Light-Induced Aggregation of Arsenic and Metal Sulfide Particles in Acidic Wastewater: The Role of Free Radicals.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(18),10719-10727.
MLA Kong, Linghao,et al."UV-Light-Induced Aggregation of Arsenic and Metal Sulfide Particles in Acidic Wastewater: The Role of Free Radicals".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.18(2018):10719-10727.
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