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

IF 5.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Sustainability Science Pub Date : 2025-03-07 DOI:10.3390/su17062359

Ying Zhu, Xingguang Hao, Xin Sun, Fei Wang, Kai Li, Ping Ning, Lei Shi

引用次数: 1

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.

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高浓度H2SO4中H2S沉淀砷规律的研究

针对浓硫酸洗涤含砷烟气产生的含砷酸性废水，研究了H2S对含砷烟气的除砷效果。研究了H2S浓度、气体流速、H2SO4浓度、温度和Cl−/F−离子对除砷效果的影响。结果表明，H2S浓度是主要影响因素。砷以无定形As2S3析出，残余砷降至0.28 mg/L。Cl−增强了砷的去除，产生了0.68 mg/L的残留浓度，而F−表现出双重效果：低浓度的抑制和高浓度的促进。在100 g/L F−时，砷残留为29.59 mg/L。这些效应归因于Cl−/F−改变了As2S3颗粒的表面电化学性质。此外，两种离子均能提高As2S3的疏水性。该研究为含砷硫酸的提纯提供了新的思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainability Science 环境科学-环境科学

CiteScore

11.30

自引率

10.00%

发文量

174

审稿时长

3 months

期刊介绍： The journal Sustainability Science offers insights into interactions within and between nature and the rest of human society, and the complex mechanisms that sustain both. The journal promotes science based predictions and impact assessments of global change, and seeks ways to ensure that such knowledge can be understood by society and be used to strengthen the resilience of global natural systems (such as ecosystems, ocean and atmospheric systems, nutrient cycles), social systems (economies, governments, industry) and human systems at the individual level (lifestyles, health, security, and human values).