H3BO3水解法制备TiO2介观晶体过程中温度对产物性质的影响

In this paper, the topotactic transformation reaction of NH4TiOF3 in H3BO3 solution was investigated and used to prepare anatase TiO2 mesocrystals. The impact of the reaction temperature on the structures and properties of the final products were detailedly investigated. XRD technology was used to identify the compositons. BET method was used to obtain the specific surface areas. SEM and TEM were used to analyze the structures and morphologies. Decolorization of methylene blue was used to assess the photocatalytic abilities. The results indicate that: the topotactic transformation reaction of NH4TiOF3 in H3BO3 solution can be used to prepare TiO2 mesocrystals; the reaction tempare can change the crystallization degrees, specific surface areas, morphologies and photocatalytic abilities of the final products. Hydrothermal reaction can increase the crystallization degrees of the final products and make them close to those of the sintered samples. However it can not increase the percentage of the exposed {001} facets on the surface of the final products, and therefore limit the further increasement of photocatalytic abilities.