期刊
出版社
ELSEVIER
DOI: 10.1016/j.mseb.2020.114690
关键词
Core-multishell; Pb(II) removal; Insulator porous SiO2; Adsorption; Thermal and chemical stability
A core-shell of Fe3O4-TiO2 (FT) and a core-multishell of Fe3O4-SiO2-TiO2 (FST) were synthesized to remove Pb (II) from water. Removal kinetics and isotherm fitted better with Pseudo-second order and Freundlich models, respectively. Activation energies for FST (55.54 kJ mol(-1)) and FT (78.775 kJ mol(-1)) suggested chemical ad-sorption and also easier adsorption on FST. The thermodynamic parameters disclosed that the adsorption of Pb (II) on nanoparticles was endothermic (Delta H degrees: 38.27 and 65.43 kJ mol(-1)) and spontaneous. XPS was done to determine the role of SiO2 by its influence on chemical stability, surface properties and functional groups as well as to explore adsorption mechanism while XRD proved thermal instability for FT. The results suggested that ion exchange between hydroxyl groups and Pb species was accounted for by the adsorption and led to PbTiO3 and PbO formation. However creation of Fe2TiO5/Fe2O3 interface on FT was responsible for its higher e/h recombination and lower adsorption capability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据