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A Study on the Rule of Arsenic Precipitation by H 2 S in High Concentrations of H 2 SO 4

Author

Listed:
  • Ying Zhu

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Xingguang Hao

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Xin Sun

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Fei Wang

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Kai Li

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Ping Ning

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

  • Lei Shi

    (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
    National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China)

Abstract

Herein, targeting arsenic-containing acidic wastewater generated from washing arsenic-containing flue gas with concentrated sulfuric acid, the arsenic removal efficiency using H 2 S was investigated. The effects of H 2 S concentration, the gas flow rate, H 2 SO 4 concentration, temperature, and Cl − /F − ions on arsenic removal were studied. Results indicate that H 2 S concentration is the primary factor. Arsenic was precipitated as amorphous As 2 S 3 , 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 As 2 S 3 particles. Additionally, both ions improved As 2 S 3 hydrophobicity. This study provides insights for purifying arsenic-containing sulfuric acid.

Suggested Citation

  • Ying Zhu & Xingguang Hao & Xin Sun & Fei Wang & Kai Li & Ping Ning & Lei Shi, 2025. "A Study on the Rule of Arsenic Precipitation by H 2 S in High Concentrations of H 2 SO 4," Sustainability, MDPI, vol. 17(6), pages 1-19, March.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:6:p:2359-:d:1607778
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