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

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Fangcao, Li^1 ; Jie, Li^1 ; Wenqiang, He^1 ; Meiyi, Xiao^1 ; Siqin, Chen^1 ; Mang, Yu^1

School of Food and Environmental Engineering, Wu Chang Institute of Technology, Wuhan, China^1

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

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/3/032016/pdf
DOI  :  10.1088/1755-1315/295/3/032016

学科分类：环境科学（综合）

来源: IOP

【 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.