标题：I2-Hydrosol-Seeded Growth of (I2)_n-C-Codoped Meso/Nanoporous TiO2 for Visible Light-Driven Photocatalysis
作者：Pu Xu;Jun Lu;Tao Xu
作者机构：[Xu, P] School of Chemistry and Materials Science, Ludong University, Yantai 264025, Shandong, China;[ Lu, J] Department of Physics, Northern Illinois 更多
通讯作者地址：[Xu, T]No Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA.
来源：The journal of physical chemistry, C. Nanomaterials and interfaces
摘要：We report a template-free process to fabricate (I2)_n-C-codoped meso/nanoporous TiO2 nanocrystallites. I2 nanoparticles in I2-hydrosol were used as seeds to initial the nucleation of a precursory TiO2 shell formed by the hydrolysis of organotitanium molecules. The hybridized jumbles were further calcinated at different temperatures. The resulting (I2)_n-C-codoped meso/nanoporous TiO2 structure was confirmed by transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer—Emmett—Teller (BET) isotherm adsorption of N2. UV—visible diffuse reflectance spectroscopy (DRS) showed that (I2)_n-C-codoped porous TiO2 samples have a strong absorption between 400—700 nm. The formation mechanism of (I2)_n-C-codoped meso/nanoporous TiO2 spheres is discussed. Under visible light radiation, our samples exhibit superior ability in the photocatalytic degradation of methylene blue to that of the only C-doped TiO2 or to the commercial P25 TiO2 nanoparticles. The origin of the enhanced visible light—light driven photocatalytic degradation is attributed to the continuous states in the band gap of TiO2 introduced by I2 doping. Factors that contribute to the enhanced photocatalytic reaction are also studied, including the enhanced thermostability and conductivity of anatase TiO2 due to C doping, the location of I2 doping, as well as the morphology of the TiO2 structures.