磷酸盐对土壤吸附一硫代砷的影响

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摘要通过设计批实验和表征分析，探究不同浓度的磷酸盐影响下，一硫代砷酸盐（MTA）在土壤上的吸附特征和机理.结果发现，Elovich动力学模型和Langmuir等温吸附模型可较好地拟合MTA在土壤中的吸附过程，相关系数R²分别为0.983和0.994，表明土壤吸附MTA发生在局部位置，吸附过程主要以非均相扩散为主，拟合所得最大单层吸附量为254.214mg/kg.MTA与磷酸盐共存时，随着溶液中磷酸盐初始浓度的增大，土壤对MTA的平衡吸附量逐渐下降，对磷酸盐的吸附量逐渐增大；SEM-EDS结果表明无论是否添加磷酸盐，反应后的土壤表面都能检测到少量As，但添加磷酸盐条件下土壤表面的As含量则相对较低，证实磷酸盐的存在降低了土壤对MTA的吸附；XRD结果表明MTA能与土壤中的铁铝矿物发生络合反应生成内球络合物－[2Al （H₂AsO₄）₃]、≡Al₂O₂AsO （SH）和－[2Fe （H₂AsO₄）₃]，而磷酸盐会与土壤表面的羟基形成内球络合物，导致土壤对MTA的吸附能力减弱.

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	张进贤
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	刘允全
	石谦

关键词 ：一硫代砷, 土壤, 吸附, 磷酸盐

Abstract：In this study, batch experiments and characterization analysis were conducted to explore the characteristics and mechanism of MTA adsorption on soil by adding different concentrations of phosphate. Results showed that:the Elovich kinetic model and Langmuir isothermal adsorption model can better fit the adsorption process of MTA on soil, indicating that the adsorption process of MTA was mainly affected by the diffusion of pore size. The maximum adsorption capacity of MTA on soil was 254.214mg/kg. With the increase of the initial concentrations of adding phosphate in the solution, the equilibrium adsorption capacity of MTA on soil gradually decreases, and that of phosphate gradually increases. SEM-EDS results showed that a small amount of As was detected on the surface of soil whether adding phosphate or not. In the system with phosphate addition, the soil showed a relatively low content of As, confirming that the presence of phosphate can reduce the adsorption of MTA on soil. In addition, XRD results showed that MTA can form endosphere complexes of -[2Al(H₂AsO₄)₃],≡Al₂O₂AsO(SH) and -[2Fe(H₂AsO₄)₃] with Fe-Al minerals in soil samples, and phosphate can form endosphere complexes with hydroxyl groups on the surface of soil, weakening the adsorption of MTA.

Key words： monothiosarsenate soil adsorption phosphate

收稿日期: 2021-12-23

PACS:

X53

基金资助:国家自然科学基金资助项目（41877194，42062015，42167026），广西自然科学基金资助项目（桂科AD19110024，桂科AD19110062）

通讯作者: 单慧媚,副教授,shanhuimei@glut.edu.cn E-mail: shanhuimei@glut.edu.cn

作者简介: 张进贤(1997-),男,甘肃白银人,桂林理工大学硕士研究生,研究方向为地下水污染.发表论文4篇.

引用本文:

张进贤, 单慧媚, 廖丹雪, 彭三曦, 杜海玲, 刘允全, 石谦. 磷酸盐对土壤吸附一硫代砷的影响[J]. 中国环境科学, 2022, 42(8): 3849-3857. ZHANG Jin-xian, SHAN Hui-mei, LIAO Dan-xue, PENG San-xi, DU Hai-ling, LIU Yun-quan, SHI Qian. Effect of phosphate on monothiosarsenate adsorption to soil. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3849-3857.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I8/3849

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