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<p>H<sub>2</sub>S treatment is a potential method to remove As from smelting wastewater. However, it was difficult to achieve the high concentration As containing wastewater to standard through H<sub>2</sub>S one-step treatment. Meanwhile, the sulfide-abundant conditions after H<sub>2</sub>S treatment changed the As species and the pH condition, which put forward challenges for removing As deeply. In this study, we developed an H<sub>2</sub>S-modification method to prepare sulfide nanoscale zero-valent iron (S-nZVI) to improve the acid resistance and the adsorption performance of adsorbents for As in sulfide-abundant conditions. The results showed that the H<sub>2</sub>S-modification method expanded the pH windows with excellent As(III) removal efficiency from 3 to 7, and at pH value of 3, the As(III) removal efficiency reached 99%. Under pH = 3, the concentration of iron released from nanomaterials decreased from 200 to 20&#xa0;mg/L, which is attributed to the protection of the surface by the FeS<sub>x</sub> layer. Moreover, through H<sub>2</sub>S-sulfidation, H<sub>3</sub>AsO<sub>3</sub> (As-O species) transformed to As-S species, which were more challenging to remove than As-O species. In As(III)-S(-II) solution, S-nZVI adsorbed 95% of As(III) in the range of pH 1–5, and the excessive S(-II) could react with Fe(III) to accelerate the cycle of Fe(III)/Fe(II). This improved the efficiency of the Fenton reaction to enhance the oxidation of As(III). Furthermore, consumption of the S(-II) could promote the transformation from As-S species to As-O species. Thus, excellent acid resistance and the synergy with S(-II) made S-nZVI holds great potential to be applied in As(III) removal.</p>

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Evaluation of As(III) Removal and Corresponding Species Regulation Mechanism from Sulfide-Abundant Arsenic Solution with Potential Application in Smelting Wastewater

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Leipeng Ji,
  • Haomiao Xu,
  • Fubing Zhang,
  • Xiaoming Sun,
  • Wenjun Huang,
  • Zan Qu,
  • Naiqiang Yan

摘要

H2S treatment is a potential method to remove As from smelting wastewater. However, it was difficult to achieve the high concentration As containing wastewater to standard through H2S one-step treatment. Meanwhile, the sulfide-abundant conditions after H2S treatment changed the As species and the pH condition, which put forward challenges for removing As deeply. In this study, we developed an H2S-modification method to prepare sulfide nanoscale zero-valent iron (S-nZVI) to improve the acid resistance and the adsorption performance of adsorbents for As in sulfide-abundant conditions. The results showed that the H2S-modification method expanded the pH windows with excellent As(III) removal efficiency from 3 to 7, and at pH value of 3, the As(III) removal efficiency reached 99%. Under pH = 3, the concentration of iron released from nanomaterials decreased from 200 to 20 mg/L, which is attributed to the protection of the surface by the FeSx layer. Moreover, through H2S-sulfidation, H3AsO3 (As-O species) transformed to As-S species, which were more challenging to remove than As-O species. In As(III)-S(-II) solution, S-nZVI adsorbed 95% of As(III) in the range of pH 1–5, and the excessive S(-II) could react with Fe(III) to accelerate the cycle of Fe(III)/Fe(II). This improved the efficiency of the Fenton reaction to enhance the oxidation of As(III). Furthermore, consumption of the S(-II) could promote the transformation from As-S species to As-O species. Thus, excellent acid resistance and the synergy with S(-II) made S-nZVI holds great potential to be applied in As(III) removal.