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| Adsorption characteristics of Sb（Ⅲ）by two types of synthesized schwertmannite |
| Received:July 16, 2024 |
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| KeyWord:schwertmannite;Sb（Ⅲ）;adsorption characteristics;environmental factor;characterization |
| Author Name | Affiliation | E-mail | | SONG Wenjie | Pioneer College, Inner Mongolia University, Hohhot 010021, China | | | Dudagula | Inner Mongolia Ecological Environment Inspection Technical Support Center, Hohhot 010011, China | | | XIE Zhilei | Inner Mongolia Environmental Monitoring Station, Hohhot 010011, China | | | LI Hao | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | LI Zhichao | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | | | HE Jiang | School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China | ndjhe@imu.edu.cn |
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| Abstract: |
| 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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