化工学报2018，Vol.69Issue(1)：446-454,9.DOI:10.11949/j.issn.0438-1157.20170835
海胆状Fe3O4@TiO2磁性纳米介质对Pb2+的选择吸附特性
Selective adsorption of Pb2+ by sea urchin magnetic nano-Fe3O4@TiO2
摘要
Abstract
The sea urchin magnetic nano-Fe3O4@TiO2 particles (SUMNPs) with core-shell structure were prepared by sol-gel technique combined with hydrothermal method.The morphologies and surface areas of SUMNPs were characterized by methods such as TEM and SEM.It was confirmed that the sea-urchin magnetic nanomaterial exhibit Fe3O4 microsphere as core and TiO2 as shell, the diameter of the particles is about 400 nm, the specific surface area is 236.082 m2·g-1, and the surface pore size is about 6.274 nm.The adsorption on heavy metal ions showed that, based on the Pb2+ ion radius is large and the layers of elections is more, in the mixed system of Pb2+, Cd2+, Cu2+, Zn2+ and Ni2+, SUMNPs could adsorb Pb2+ with high capacity and high selectivity, and almost no adsorption of other four heavy metal ions.The single Pb2+ adsorption could be fast equilibrium in 5 min and the equilibrium adsorption capacity was 283 mg·g-1.The adsorption process is in accordance with the Langmuir isothermal adsorption model, and the saturated adsorption capacity is up to 458.72 mg·g-1.After desorbed and regenerated by EDTA disodium and NaOH, SUMNPs can be reused more than 8 times.In summary, SUMNPs have excellent selectivity for Pb2+, and have good application prospect in the treatment of pollution and restoration of water ecological environment.关键词
水热合成/磁性纳米粒子/多孔介质/重金属吸附/热力学性质Key words
hydrothermal synthesis/magnetic nanoparticles/porous media/heavy metal adsorption/thermodynamic properties分类
资源环境引用本文复制引用
王耀强,赵怡琳,李玲慧,苏海佳..海胆状Fe3O4@TiO2磁性纳米介质对Pb2+的选择吸附特性[J].化工学报,2018,69(1):446-454,9.基金项目
国家自然科学基金项目(21525625) （21525625）
国家重点基础研究发展计划项目(2014CB745100) （2014CB745100）
国家高技术研究发展计划项目(2013AA020302). supported by the National Natural Science Foundation of China (21525625),the National Basic Research Program of China (2014CB745100) and the National High Technology Research and Development Program of China(2013AA020302). （2013AA020302）
