| 宋文杰,都达古拉,谢志磊,李浩,李智超,何江.两种合成施氏矿物对Sb（Ⅲ）的吸附特性[J].农业环境科学学报,2025,44(5):1365-1377. |
| 两种合成施氏矿物对Sb（Ⅲ）的吸附特性 |
| Adsorption characteristics of Sb（Ⅲ）by two types of synthesized schwertmannite |
| 投稿时间：2024-07-16 |
| DOI：10.11654/jaes.2024-0604 |
| 中文关键词: 施氏矿物 Sb（Ⅲ） 吸附特性 环境因子 表征 |
| 英文关键词: schwertmannite Sb（Ⅲ） adsorption characteristics environmental factor characterization |
| 基金项目:国家自然科学基金项目（32160299，42167028） |
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| 摘要点击次数: 145 |
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| 中文摘要: |
| 为探究不同化学合成方法制备的施氏矿物（Schwertmannite，SCH）对Sb（Ⅲ）的吸附性能差异，本实验制备了两种SCH（H2O2法制备的H-SCH和KMnO4法制备的M-SCH），以两种SCH对Sb（Ⅲ）的吸附性能研究为主线，开展吸附动力学及热力学研究，并结合铁还原菌（Iron-reducing bacteria，FeRB）、硫酸盐还原菌（Sulfate-reducing bacteria，SRB）以及共存As、Cr、溶解性有机质（Dissolved organic matter，DOM）对SCH吸附Sb（Ⅲ）的影响研究，揭示了不同化学法合成的SCH对Sb（Ⅲ）吸附的差异性机制。结果表明，KMnO4法主要是通过增加比表面积和孔隙度的方式增强了SCH对Sb（Ⅲ）的物理吸附能力。本实验认为物理吸附和化学吸附均在H-SCH和M-SCH吸附Sb（Ⅲ）的过程中发挥着重要作用，在两种SCH吸附Sb（Ⅲ）的过程中，部分Sb（Ⅲ）会在SCH表面被Fe（Ⅲ）氧化为Sb（Ⅴ），SCH主要通过表面OH络合的方式吸附Sb（Ⅲ），通过表面OH络合及SO42-离子交换的方式吸附Sb（Ⅴ）。富里酸（Fulvic acid，FA）、FeRB和SRB的存在均会抑制两种SCH对Sb（Ⅲ）的吸附，FA和FeRB还原产生的Fe（Ⅱ）以及SRB还原产生的S2-均会抑制Sb（Ⅲ）在SCH表面的氧化，从而使得两种SCH对Sb（Ⅲ）的吸附能力下降。共存As（Ⅲ）和Cr（Ⅵ）会抑制两种SCH对Sb（Ⅲ）的吸附，As（Ⅲ）和Cr（Ⅵ）会与Sb（Ⅲ）竞争SCH中的吸附位点。但随着Cr（Ⅵ）浓度升高，更多的Sb（Ⅲ）被Cr（Ⅵ）氧化成Sb（Ⅴ），相较于Sb（Ⅲ），Sb（Ⅴ）更易被SCH吸附，从而使得Cr（Ⅵ）对SCH吸附Sb（Ⅲ）的抑制作用不升反降。 |
| 英文摘要: |
| To investigate the differences in adsorption performance of Sb（Ⅲ）by schwertmannite（SCH）prepared using different chemical synthesis methods, two types of SCH were synthesized in this experiment：H-SCH（prepared via the H2O2 method）and M-SCH（prepared via the KMnO4 method）. The main emphasis was placed on the adsorption performance of these SCH for Sb（Ⅲ）, encompassing kinetic and thermodynamic studies. The influences of iron-reducing bacteria（FeRB）, sulfate-reducing bacteria（SRB）, coexisting As, Cr, and dissolved organic matter（DOM）on Sb（Ⅲ）adsorption by SCH were also examined to clarify the differential mechanisms of Sb（Ⅲ） adsorption by SCH synthesized through dissimilar chemical methods. The findings demonstrated that the KMnO4 method augmented the physical adsorption capacity of M-SCH for Sb（Ⅲ）by increasing its specific surface area and porosity. This study implies that both physical and chemical adsorption exert crucial roles in Sb（Ⅲ）adsorption by H-SCH and M-SCH. During the adsorption process, a portion of Sb（Ⅲ）is oxidized to Sb（Ⅴ）on the SCH surface by Fe（Ⅲ）, with Sb（Ⅲ）being primarily adsorbed via surface OH complexation and Sb（Ⅴ）being adsorbed through both —OH complexation and SO42- exchange. The existence of fulvic acid（FA）, FeRB, and SRB impeded Sb（Ⅲ）adsorption by both SCH types, as FA, Fe（Ⅱ）generated by FeRB, and S2- produced by SRB hindered the oxidation of Sb（Ⅲ）on the SCH surface, resulting in a reduced Sb（Ⅲ）adsorption capacity. Coexisting As（Ⅲ）and Cr（Ⅵ）also inhibited Sb（Ⅲ）adsorption by competing for adsorption sites on SCH. Nevertheless, as the concentration of Cr（Ⅵ）increased, more Sb（Ⅲ）was oxidized to Sb（Ⅴ）by Cr （Ⅵ）, which, being more readily adsorbed by SCH than Sb（Ⅲ）, led to a decrease in the inhibitory effect of Cr（Ⅵ） on Sb（Ⅲ）adsorption. |
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