Microwave-assisted hydrothermal synthesis of hierarchically porous γ-Al_2O_3 hollow microspheres with enhanced Cu~(2+) adsorption performance

摘要

Hierarchically meso-macroporous γ-Al_2O_3 hollow microspheres were synthesized at 180 ℃ for 40 min for the first time by a microwave-assisted hydrothermal (MAH) followed by calcination at 600 ℃ for 2 h route, using KAl(SO_4)_2 and urea as raw materials. The results show that the obtained γ-Al_2O_3 hollow microspheres are about 0.8-1.2 μm in diameter with a shell thickness of approximately 200 nm and the high surface area of 242 m~2/g. The prepared γ-Al_2O_3 hollow microspheres also exhibit an enhanced adsorption performance for Cu~(2+) in solution than those prepared by hydrothermal (HT) method and commercial γ-Al_2O_3.