Preparation and Properties of Heat Durable N:TiO_2 Antibacterial Nano-Ceramics

摘要

As a new type of environmental pollutant reduction technology, semiconductor nano-TiO_2 photocatalytic technology has attracted widely attention in recent years. In order to overcome the disadvantage of pure TiO_2 photocatalyst in lower utilization of solar energy and heat durability, the sol-gel method followed by co-precipitation method was employed to synthesize ZnO packed N:TiO_2 nano-powders, and EDS, XRD, SEM, UV-VIS analysis as well as detection of degradation rate of methyl orange were used to characterize the composition, phase, micro-morphology and the photocatalytic properties of the nano-powders. The results showed that the excitation band of the composite powders extended from the UV region to the visible light zone, indicating a remarkable improvement of the photocatalytic activities of TiO_2 composite powders under both visible light and UV irradiation. After calcined at 950℃, the composite powders still remained mixed crystal structures of anatase and rutile phases with the diameter of the composite powder being about 60nm. After coated with ZnO, the heat durability of the N-doped nano-TiO_2 composite powders was significantly improved 250℃.