Facile hydrothermal synthesis of TiO_2-Bi_2WO_6 hollow superstructures with excellent photocatalysis and recycle properties

摘要

One-dimensional mesoporous TiO_2-Bi_2WO_6 hollow superstructures are prepared using a hydrothermal method and their photocatalysis and recycle properties are investigated. Experimental results indicate that anatase TiO_2 nanoparticles are coupled with hierarchical Bi_2WO_6 hollow tubes on their surfaces. The TiO_2-Bi_2WO_6 structure has a mesoporous wall and the pores in the wall are on average 21 nm. The hierarchical TiO_2-Bi_2WO_6 heterostructures exhibit the highest photocatalytic activity in comparison with P25, pure Bi_2WO_6 hollow tube and mechanical mixture of Bi_2WO_6 tube and TiO_2 nanoparticle in the degradation of rhodamine B (RhB) under simulated sunlight irradiation. The as-prepared TiO_2-Bi_2WO_6 heterostructures can be easily recycled through sedimentation and they retains their high photocatalytic activity during the cycling use in the simulated sunlight-driving photodegradation process of RhB. The prepared mesoporous TiO_2-Bi_2WO_6 with hollow superstructure is therefore a promising candidate material for water decontamination use.