巯基改性纳米TiO2对痕量重金属离子吸附性能研究  

Study on adsorption properties of lanthanum-modified nano-TiO2 for trace heavy metal ions

作　　者：李林[1,2] 陈蓓蓓 张莹 王艳娇 何锦林 LI Lin;CHEN Bei-bei;ZHANG Ying;WANG Yan-jiaO;HE Jin-lin(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,Guizhou Province,China;Guizhou Academy Testing and Analysis,Guiyang 550001,Guizhou Province,China)

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]贵州省分析测试研究院,贵州贵阳550001

出　　处：《化学工程》2020年第1期29-33,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(2166070108)

摘　　要：钛酸丁酯(TBT)作为前驱物,采用溶胶-凝胶法进行共聚缩合,制备出巯基功能化TiO2纳米材料,并将其运用于水体中痕量重金属的吸附富集研究。采用X射线粉末衍射仪、傅里叶红外、扫描电镜表征了吸附前后巯基化TiO2纳米材料的物相组成、官能团、形貌变化。考察了初始pH值、时间和干扰离子对巯基化TiO2纳米材料吸附重金属离子的影响。在优化吸附条件下借助火焰原子吸收分光光度计测定样品中重金属离子质量分数,该方法利用巯基化TiO2纳米材料可有效富集水中的痕量Cd^2+,Hg^2+,Pb^2+离子,按Cd^2+,Hg^2+,Pb^2+在样品和洗脱液中的浓度计算,富集倍数可达100倍以上,对提高痕量Cd^2+,Hg^2+,Pb^2+检测的灵敏度和准确性起着重要作用。Butyl titanate(TBT),as a precursor,was copolymerized and condensed by sol-gel method to prepare thiol-functionalized TiO2 nanomaterials,and then was applied to the study of adsorption and enrichment of trace heavy metals in water.X-ray powder diffractometry,Fourier infrared spectroscopy,and scanning electron microscopy were used to characterize the phase composition,functional groups,and morphology of the thiolated TiO2 nanomaterials before and after adsorption.The effects of initial pH,time and interfering ions on the adsorption of heavy metal ions on thiolated TiO2 nanomaterials were investigated.The content of heavy metal ions in the sample was determined with the aid of a flame atomic absorption spectrophotometer under the optimal conditions of adsorption.This method utilized thiolated TiO2 nanomaterials to effectively enrich trace amounts of Cd^2+,Hg^2+,and Pb^2+ions in water.According to calculation concentration of Cd^2+,Hg^2+,and Pb^2+in the sample and eluent,the enrichment factor can be more than 100 times and plays an important role in improving the sensitivity and accuracy of the detection of trace amounts of Cd^2+,Hg^2+,and Pb^2+.

关 键 词：巯基化TiO2 纳米材料 痕量重金属 原子吸收分光光度计 

分 类 号：TB383.1[一般工业技术—材料科学与工程]