MOF-Fe@Fer复合物对Se(Ⅳ)的吸附特性  

Adsorption Properties of MOF-Fe@Fer Complexes for Se(IV)

作　　者：李坤 许海娟 黎新宇 魏世勇 LI Kun;XU Haijuan;LI Xinyu;WEI Shiyong(College of Chemistry and Environmental Engineering,Hubei Minzu University,Enshi Hubei 445000)

机构地区：[1]湖北民族大学化学与环境工程学院,湖北恩施445000

出　　处：《湖北理工学院学报》2024年第1期14-20,46,共8页Journal of Hubei Polytechnic University

基　　金：国家自然科学基金项目(项目编号:42067007);湖北省重点研发计划项目(项目编号:2022BAD013);湖北民族大学揭榜挂帅项目(项目编号:JB22001)。

摘　　要：水热条件下制备了不同比例的水铁矿(Fer)与MOF-Fe的复合物(MOF-Fe@Fer x),通过X射线衍射(XRD)、N 2等温吸附/脱附、Zeta电位等技术,分析了样品的结构和基本性质,并用Freundlich、Sips模型、拟二阶速率方程和颗粒内扩散模型分别拟合了样品对Se(Ⅳ)的等温吸附数据和动力学吸附数据,研究了样品对Se(Ⅳ)的吸附特性。结果表明,相同条件下,MOF-Fe@Fer复合物对Se(Ⅳ)的吸附量高于MOF-Fe和Fer,表明负载Fer大大提高了MOF-Fe对Se(Ⅳ)的吸附容量。4种复合物中MOF-Fe@Fer 0.8的吸附量最大,对Se(Ⅳ)的吸附属于异质性表面的多层吸附,吸附过程主要受化学吸附和颗粒内扩散等作用控制。Complexes with different ratios of hydrotalcite(Fer)and MOF-Fe(MOF-Fe@Fer x)were prepared under hydrothermal conditions,and the structure and basic properties of the samples were analyzed by various techniques,including X-ray diffraction(XRD),N 2 isothermal adsorption/desorption,Zeta potential,etc.The isothermal adsorption data and the kinetic adsorption data of the samples were fitted to the isothermal adsorption and kinetic adsorption data of the samples,respectively,with the Freundlich and Sips models,the fitted second-order rate equations,and the intraparticle diffusion model,so that the adsorption characteristics of the samples on Se(Ⅳ)could be investigated.The results show that the adsorption of Se(Ⅳ)by the MOF-Fe@Fer complex is higher than that of MOF-Fe and Fer under the same conditions,indicating that loading Fer greatly improves the adsorption capacity of Se(Ⅳ)by MOF-Fe.Among the four complexes,MOF-Fe@Fer 0.8 has the largest adsorption amount,and the adsorption of Se(Ⅳ)belongs to the multilayer adsorption of heterogeneous surfaces.The adsorption process is mainly controlled by chemisorption and intraparticle diffusion.

关 键 词：MOF-Fe FER 吸附 亚硒酸盐 表面性质 

分 类 号：X703[环境科学与工程—环境工程]