Facile controlled synthesis of core–shell/yolk–shell/hollow ZIF-67@Co-LDH/SiO2via a self-template method

Abstract

The core–shell/yolk–shell/hollow structures of nanoparticles have attracted considerable attention due to their wide applications in various fields. Herein, we have successfully developed a facile strategy for the controlled synthesis of core–shell/yolk–shell/hollow structured ZIF-67@Co-LDH/SiO₂ by using zeolitic imidazolate framework-67 (ZIF-67) as a self-sacrificing template. The mesoporous core–shell/yolk–shell/hollow nanostructured ZIF-67@Co-LDH/SiO₂ material was obtained by controlling the reaction time under the protection of hexadecyltrimethylammonium bromide. In this research, SEM, TEM and PXRD were used to characterize the morphology, size, composition and structure of the obtained ZIF-67@Co-LDH/SiO₂ material. The formation mechanism of the core–shell/yolk–shell/hollow structures was elucidated. Moreover, the unique structural characteristics and porosity enable the prepared core–shell/yolk–shell/hollow nanostructure ZIF-67@Co-LDH/SiO₂ to exhibit good adsorption performance for Congo red.