Template-induced synthesis of hierarchical Si0_2@y-A100H spheres and their application in Cr(VI) removal

摘要

Hierarchical structured Si0_2@y-AIOOH spheres were fabricated in one step by using silica colloidal spheres as a template. Scanning electron microscopy and transmission electron microscopy investigation showed that the shell is composed of large amounts of nanoscale y-AIOOH lamellas. The growth mechanism was proposed as silica template-induced heterogeneous deposition of y-A100H lamellas. The adsorption properties of hierarchical Si0_2 @y-A100H spheres annealed at different temperatures were investigated through the removal test of Cr(VI) ions in model wastewater, and the nanostructures annealed at 400 °C showed good adsorption capability of Cr(VI) ions.