| 铁基石灰质强化钝化材料的制备及其对Sb的钝化效果 |
| 摘要点击 1015 全文点击 219 投稿时间：2024-01-22 修订日期：2024-04-15 |
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| 中文关键词 锑污染 铁基钝化材料 表征 吸附实验 土壤培养实验 |
| 英文关键词 antimony pollution iron-based passivation material material characterization adsorption experiment soil culture experiment |
| 作者 | 单位 | E-mail | | 石嘉浩 | 农业农村部环境保护科研监测所, 重金属生态毒理与污染修复创新团队, 天津 300191
农业农村部环境保护科研监测所, 农业农村部产地环境污染防控重点实验室, 天津 300191 | 1140407540@qq.com | | 保琼莉 | 农业农村部环境保护科研监测所, 重金属生态毒理与污染修复创新团队, 天津 300191
农业农村部环境保护科研监测所, 农业农村部产地环境污染防控重点实验室, 天津 300191 | 15900343312@163.com | | 储玉檀 | 农业农村部环境保护科研监测所, 重金属生态毒理与污染修复创新团队, 天津 300191
农业农村部环境保护科研监测所, 农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 孙红羽 | 农业农村部环境保护科研监测所, 重金属生态毒理与污染修复创新团队, 天津 300191
农业农村部环境保护科研监测所, 农业农村部产地环境污染防控重点实验室, 天津 300191 | | | 黄益宗 | 云南师范大学能源与环境科学学院, 昆明 650500 | yizonghuang@126.com |
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| 中文摘要 |
| 铁盐作为固化材料在土壤锑污染修复方面具有较好的效果,但使用不当会造成土壤酸化,并降低其修复效果. 采用硫酸铁、聚合硫酸铁及生石灰为原材料制备了硫酸铁基石灰质强化钝化材料（FS）和聚合硫酸铁基石灰质强化钝化材料（PFS）；利用X射线衍射检测（XRD）、扫描电子显微镜（SEM）及傅里叶变换红外光谱仪扫描（FTIR）进行表征；通过吸附实验及土培实验研究了材料的吸附机制及对土壤Sb的钝化效果. 结果表明,FS和PFS主要由铁和钙的氧化物以及氢氧化物构成,含有羟基、羰基等官能团. 由Freundlich模型等温吸附数据表明材料对Sb（Ⅲ）的吸附为多层吸附. FS和PFS对Sb（Ⅲ）的吸附量随其添加量的增加而增加. 吸附动力学过程符合拟二级动力学模型. 共存离子中PO43-对FS和PFS吸附Sb（Ⅲ）的影响最大,高浓度（0.1 mol·L-1）PO43-存在条件下会显著抑制FS和PFS对Sb（Ⅲ）的吸附,低浓度（0.01 mol·L-1和0.001 mol·L-1） PO43-存在条件下会促进FS和PFS对Sb（Ⅲ）的吸附. 添加FS和PFS均能降低土壤中柠檬酸可提取态的Sb（T）和Sb（Ⅲ）含量. 添加5%的FS和PFS使重度污染（X2）土壤可交换Sb降低幅度分别达66.39%和72.88%,轻度污染（X3）土壤的降幅达56.04%和56.86%. 土壤pH值和电导率（EC）随材料添加量的增加而显著增加. 总之,FS和PFS对Sb具有高效的吸附性能,在土壤中施用均能高效钝化Sb并缓解土壤酸化,表明两种材料具有很好的修复潜力. |
| 英文摘要 |
| As a solidified material, iron salt has a good effect on the remediation of soil antimony （Sb） pollution, but its improper use will cause soil acidification and reduce the remediation effect. The ferric sulfate cornerstone ash-reinforced passivation material （FS） and the polyferric sulfate cornerstone ash-reinforced passivation material （PFS） were prepared by using ferric sulfate, polyferric sulfate, and quicklime as raw materials. The morphology and characteristics of the materials were analyzed using X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and Fourier transform infrared spectroscopy （FTIR）. The adsorption mechanism and remediation effect of the two materials on soil Sb were studied by an adsorption experiment and a soil culture experiment. The results showed that FS and PFS were mainly composed of iron and calcium oxides and hydroxides, which contained hydroxyl, carbonyl, and other functional groups. The Freundlich model fitted the isothermal adsorption data well, indicating that the adsorption of Sb （Ⅲ） by both materials was multilayer adsorption. The adsorption capacity of Sb （Ⅲ） by FS and PFS increased with the increase in materials added. The pseudo-second-order kinetic model fitted the adsorption kinetics of FS and PFS well. Among the coexisting ions, PO43- had the greatest effect on the adsorption of Sb （Ⅲ） by FS and PFS, and the presence of a high concentration of （0.1 mol·L-1） PO43- significantly inhibited the adsorption of Sb （Ⅲ） by FS and PFS. In the presence of low concentrations （0.01 mol·L-1 and 0.001 mol·L-1） of PO43-, the adsorption of Sb （Ⅲ） by FS and PFS was promoted. The addition of FS and PFS could reduce the total Sb （T） and trivalent Sb （Ⅲ） contents of extractable citric acid in the soil. The soil culture experiment showed that adding 5% FS and PFS could reduce the exchangeable Sb content in heavily polluted soil by 66.39% and 72.88%, respectively, and reduce the exchangeable Sb content in mildly polluted soil by 56.04% and 56.86%, respectively. Soil pH and electrical conductivity （EC） increased significantly with the increase in material addition. In conclusion, FS and PFS had efficient adsorption properties for both aqueous solution and soil Sb, and application in acidic soil could significantly improve soil pH, indicating that both materials could effectively passivate soil Sb and alleviate soil acidification and have great potential in passivating remediation of Sb-polluted soil. |
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