地球与环境

文章摘要

磷酸盐对硫化亚铁(FeS)吸附Sb (Ⅲ)的影响机理研究

Mechanism of the Adsorption of Sb([KG-*4]Ⅲ[KG-*5]) by Ferrous Sulfide(FeS) under Phosphate Conditions

投稿时间：2021-01-20 修订日期：2021-11-29

DOI：10.14050/j.cnki.1672-9250.2022.50.021

英文关键词: iron sulfide trivalent antimony phosphate adsorption.

基金项目:科技部国家重点研发计划项目（2020YFC1807700、2017YFD0801000）；国家基金委-贵州省联合基金项目（U1612442）。

作者	单位	E-mail
王庆云^1,2, 张国平¹, 马超^1,2, 毛宽^1,2, 陈京晶³, 柳凤娟³	1. 中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081 2. 中国科学院大学, 北京 100049 3. 贵州师范学院地理与资源学院, 贵阳 550018	zhangguoping@vip.gyig.ac.cn

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中文摘要:

还原环境（如湖泊、海洋沉积物）中，FeS是重金属的重要载体。在富营养化过程中，磷酸盐可能对重金属在FeS上的吸附行为产生重要影响。本文通过不同pH、磷酸盐浓度的批次试验，结合X射线衍射仪（XRD）和场发射透射电子电镜-能谱仪（TEM-EDS）固体分析手段，进行磷酸盐对FeS吸附Sb （Ⅲ）的影响研究。结果表明：酸性和中性条件下，磷酸盐会与FeS溶解释放的Fe （Ⅱ）反应生成磷酸亚铁沉淀，促进FeS溶解，同时释放出更多的H₂S （aq）/HS^-与Sb （Ⅲ）结合形成Sb₂S₃沉淀，从而促进溶液中Sb （Ⅲ）的吸附。碱性条件下，FeS对Sb （Ⅲ）只有吸附作用，而磷酸盐会占据FeS表面部分的吸附位点，与Sb （Ⅲ）形成竞争关系，进而抑制溶液中Sb （Ⅲ）的吸附。

英文摘要:

In the reducing environments like lakes and marine sediments, FeS is an important carrier of heavy metals. Phosphate may have an important influence on the adsorption behavior of heavy metals on FeS during the eutrophication process. In this paper, through batch experiments with different pH and phosphate concentration, combined with X-ray diffractometer (XRD) and field emission transmission electron microscope-energy spectrometer (TEM-EDS) solid analysis methods, the adsorption process of Sb(Ⅲ) on FeS under phosphate conditions was studied. The results show that under acidic and neutral conditions, the Fe(Ⅱ) released by the dissolution of FeS will reacts with phosphate to form ferrous phosphate precipitation, and this process will promote the dissolution of FeS, release more H₂S(aq)/HS^- that combine with Sb(Ⅲ) to form Sb₂S₃ precipitation, and promote the adsorption of Sb(Ⅲ) in the solution at the same time. However, under alkaline conditions, phosphate will compete with Sb(Ⅲ) for adsorption sites on the surface of FeS, accordingly it will inhibit the removal of Sb(Ⅲ) from the solution.

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