Synthesis Of Titanates Nanomaterials And Photocatalysis Efficiency Research

With the development of the industry, the environment problem is becoming more and more serious. Many research devoted to TiO2, as it’s Efficient, inexpensive, stable physical & chemical properties, wide applications and non-toxic. However, with the wide band gap, the light length is less than 380 nm can be absorbed by TiO2. Thus the usage of sunlight is limited. During the photocatalytic degradation process, the TiO2 nanoparticles may undergo aggregation due to the instability of the nano sized particle. Furthermore, for the slurry system, one main practical challenge to overcome is to recover the nano sized TiO2 particles from the treated water in regards to both the economic concern and safety concern.To overcome those limitations of TiO2-based photocatalysis, the following countermeasures have been adopted in this studies:1)trying to modified with TiO2, and successfully synthesized the Fe-N codoped TiO2 particles with the size of 7.2nm. The Fe and N ions narrowed the band gap of TiO2, and the action will move to the visible light region;2)Single-crystalline Bi4Ti3O12 nanosheets with rectangular shape and exposed {001} facets were successfully synthesized via a sol–gel hydrothermal process for the first time. As a result, the Bi4Ti3O12 nanosheets reached as high as 79.2% of photodegradation efficiency of Rhodamine B(6ppm of initial concentration) under 90 min of sunlight irradiation, which was ～3 times that of conventionally calcined Bi4Ti3O12.3)with the base of Single-crystalline Bi4Ti3O12 nanosheets, we doped the Nd3+ on the A site, and added the Carbon nanotubes. The Nd3+ ions dopant narrowed the band of Bi4Ti3O12, and increased the electric field intensity, separated the e--h+ pairs. With the excellent electrical conductivity of CNTs, the e- can be transferred to the reactant quickly and prolong the life time of photograduated carriers;4) trying to synthesized the TiO2-based heterojunction. It not only increased the specific surface area, but also promoted the separate, thus improve the gradation efficiency.