Hierarchical structured SiO(2)@gamma-AlOOH 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 gamma-AlOOH lamellas. The growth mechanism was proposed as silica template-induced heterogeneous deposition of gamma-AlOOH lamellas. The adsorption properties of hierarchical SiO(2)@gamma-AlOOH spheres annealed at different temperatures were investigated through the removal test of Cr(VI) ions in model wastewater, and the nanostructures annealed at 400 degrees C showed good adsorption capability of Cr(VI) ions.
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Wang et al. (2009) studied this question.
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