Mesoporous Spherical Aggregates of Anatase Nanocrystals with Wormhole-like Framework Structures:Their Chemical Fabrication,Characterization,and Photocatalytic Performance

摘要

A facile and efficient approach for the fabrication of mesoporous spherical aggregates of anatase nanocrystals is reported in this paper.Cetyltrimethylammonium bromide was used as the structure-directing agent,and the interaction between cyclohexane microdroplets and the Cetyltrimethylammonium bromide self-assemblies led to the assembly of 4-5-nm-sized anatase nanocrystals into spherical aggregates with mesoporous structures.The as-prepared anatase powders exhibited high photocatalytic activity and could be effectively used as the catalyst for the room-temperature photodegradation of a variety of organic dye pollutants in aqueous media including methyl orange,bromopyrogallol red,and methylene blue.