Selective Etching of Bifunctional Core-Shell Silica to Hollow Porous Structure and Adsorption for Cd (II) Ions

[摘要] In this study, two different bifunctional core-shell structures were prepared separately using cyanoethyl-functionalized silica micro/nanospheres (CN-SiO2) and vinyl-functionalized silica micro/nanospheres (V-SiO2) as core, ureidopropyl-functionalized silica spheres (UD-SiO2) as shell, denoted as CN-SiO2@UD-SiO2 and V-SiO2@UD-SiO2, respectively. The results were showed that the amounts of cetyl trimethyl ammonium bromide (CTAB) had a great influence on the morphologies of bifunctional organic silica core-shell structures. Furthermore, the above core-shell structures have been etched in alkaline conditions to obtain hollow porous structures, and it was found from the etching experiments that the well-defined porous structures had been obtained using V-SiO2 as core. At the same time, the adsorption experiment was showed that there was a higher adsorption capacity for Cd(II) ions using V-SiO2@UD-SiO2 prepared with 0.008g of CATB as absorbent, due to their well-defined porous structures, larger surface areas and porous volume.

[发布机构] School of Food and Environmental Engineering, Wu Chang Institute of Technology, Wuhan, China^1

[效力级别] 生态环境科学 [学科分类] 环境科学（综合）

[关键词] Adsorption capacities;Adsorption experiment;Alkaline conditions;Cetyltrimethylammonium bromide;Core shell structure;Core-shell silicas;Functionalized silica;Porous structures