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Specific H2S Release from Thiosulfate Promoted by UV Irradiation for Removal of Arsenic and Heavy Metals from Strongly Acidic Wastewater
Kong, Linghao; Hu, Xingyun; Peng, Xianjia; Wang, Xianliang
2020-11-03
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume54Issue:21Pages:14076-14084
AbstractThe removal of arsenic and heavy metals (HMs) from strongly acidic wastewater by hydrogen sulfide (H2S) is an efficient method. However, traditional sulfuration reagents (Na2S, FeS, CaS, etc.) rapidly release H2S under acidic conditions via spontaneous hydrolysis, leading to serious H2S pollution. Herein, a H2S release process employing thiosulfate as a sulfuration reagent was proposed to eliminate H2S pollution. We found that thiosulfate can release H2S with specificity both in the dark and under ultraviolet (UV) irradiation under acidic conditions. In the absence of arsenic/HMs, H2S is not released because the formed H2S is consumed by a thiosulfate decomposition product, sulfite, or by its photolysis. In the presence of arsenic/HMs, H2S is released because the formed H2S immediately reacts with arsenic/HMs to generate sulfide precipitates rather than being consumed. The efficiency of transforming thiosulfate to H2S under UV irradiation is 2.5-fold the efficiency in the dark, because UV irradiation promotes the transformation of effective sulfur in thiosulfate molecules to form H2S through the transformation of HS. and S2O3.(-) radicals. Moreover, more than 99.9% of arsenic/HMs were removed from strongly acidic wastewater without producing H2S pollution under UV irradiation. This thiosulfate-based H2S-specific release process solves the problem of H2S pollution under acidic conditions.
Department环境水质学国家重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/44996
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Kong, Linghao,Hu, Xingyun,Peng, Xianjia,et al. Specific H2S Release from Thiosulfate Promoted by UV Irradiation for Removal of Arsenic and Heavy Metals from Strongly Acidic Wastewater[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(21):14076-14084.
APA Kong, Linghao,Hu, Xingyun,Peng, Xianjia,&Wang, Xianliang.(2020).Specific H2S Release from Thiosulfate Promoted by UV Irradiation for Removal of Arsenic and Heavy Metals from Strongly Acidic Wastewater.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(21),14076-14084.
MLA Kong, Linghao,et al."Specific H2S Release from Thiosulfate Promoted by UV Irradiation for Removal of Arsenic and Heavy Metals from Strongly Acidic Wastewater".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.21(2020):14076-14084.
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