铁基石灰质强化钝化材料的制备及其对Sb的钝化效果  

Preparation of Iron-based Lime-reinforced Passivation Material and Its Passivation Effect on Sb

作　　者：石嘉浩 保琼莉 储玉檀 孙红羽 黄益宗 SHI Jia-hao;BAO Qiong-li;CHU Yu-tan;SUN Hong-yu;HUANG Yi-zong(Innovation Team of Toxicology and Pollution Remediation of Heavy Metal,Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;Key Laboratory of Original Environmental Pollution Control,Ministry of Agriculture,Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;School of Energy and Environment Science,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]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 [2]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 [3]云南师范大学能源与环境科学学院,昆明650500

出　　处：《环境科学》2025年第2期1118-1129,共12页Environmental Science

基　　金：国家重点研发计划项目(2020YFC1808702);中国农业科学院科技创新专项。

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PO_(4)^(3-)对FS和PFS吸附Sb(Ⅲ)的影响最大,高浓度(0.1 mol·L^(-1))PO_(4)^(3-)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))PO_(4)^(3-)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p H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.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,PO_4~(3-)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)) PO_4~(3-)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 PO_4~(3-),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 p H and electrical conductiv

关 键 词：锑污染 铁基钝化材料 表征 吸附实验 土壤培养实验 

分 类 号：X53[环境科学与工程—环境工程]