A Study on the Rule of Arsenic Precipitation by H2S in High Concentrations of H2SO4

被引：0
作者：
Zhu, Ying [1 ,2 ]
Hao, Xingguang [1 ,2 ]
Sun, Xin [1 ,2 ]
Wang, Fei [1 ,2 ]
Li, Kai [1 ,2 ]
Ning, Ping [1 ,2 ]
Shi, Lei [1 ,2 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Environm Sci & Engn, Kunming 650500, Peoples R China
[2] Kunming Univ Sci & Technol, Natl Reg Engn Ctr Recovery Waste Gases Met & Chem, Kunming 650500, Peoples R China
来源：
SUSTAINABILITY | 2025年 / 17卷 / 06期
基金：
中国国家自然科学基金;
关键词：
As removal; sulfuric acid; H2S; Cl anion; F anion; SULFIDE PRECIPITATION; REMOVAL; ADSORPTION; REDOX; ACID; SO2; FES;
D O I：
10.3390/su17062359
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Herein, targeting arsenic-containing acidic wastewater generated from washing arsenic-containing flue gas with concentrated sulfuric acid, the arsenic removal efficiency using H2S was investigated. The effects of H2S concentration, the gas flow rate, H2SO4 concentration, temperature, and Cl-/F- ions on arsenic removal were studied. Results indicate that H2S concentration is the primary factor. Arsenic was precipitated as amorphous As2S3, reducing residual arsenic to 0.28 mg/L. Cl- enhanced arsenic removal, yielding a residual concentration of 0.68 mg/L, while F- exhibited a dual effect: the inhibition at low concentrations and promotion at high concentrations. At 100 g/L F-, the residual arsenic was 29.59 mg/L. These effects are attributed to Cl-/F- altering the surface electrochemical properties of As2S3 particles. Additionally, both ions improved As2S3 hydrophobicity. This study provides insights for purifying arsenic-containing sulfuric acid.
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页数：18
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