A Study on the Rule of Arsenic Precipitation by H2S in High Concentrations of H2SO4
Year: 2025
Type: article
Abstract: 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.
Source: Sustainability
DOI: 10.3390/su17062359
Authors: Ying Zhu, Xingguang Hao, Xin Sun, Fei Wang, Kai Li, Ping Ning, Lei Shi
Institution: Kunming University of Science and Technology
Language: English
Subfield: Environmental Chemistry
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
OpenAlex ID: W4408226559