Sonochemical fabrication of novel square-shaped F doped TiO2 nanocrystals with enhanced performance in photocatalytic degradation of phenol.

A sonochemical method was developed for the fabrication of novel square-shaped TiO(2) nanocrystals doped with different F contents. The prepared samples were characterized by some physicochemical characterizations like X-ray diffraction (XRD), N(2) physical adsorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrum (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy and UV-vis diffuse reflectance spectra (DRS). Phenol, as a hazardous chemical in water, was chosen to evaluate the photocatalytic degradation performance of the prepared TiO(2) nanocrystals under UV light irradiation. Results show that under ultrasonic irradiation conditions, F can easily be doped into TiO(2) and the obtained pure and F doped TiO(2) nanocrystals show mesoporous structures which were formed by the role of ultrasound-induced aggregation. Moreover, the doping of optimal content of F (1.3 mol%) gives 5.3 times increase in the phenol degradation rate. The high photocatalytic degradation activity of the doped TiO(2) could be attributed to the factor that F doping increases the surface hydroxyl groups over TiO(2) and effectively reduces the recombination rate of photo-generated electron/hole pairs, then producing more OH radicals to decompose the phenol molecules.

Yu C ，Fan Q ，Xie Y ，Chen J ，Shu Q ，Yu JC ... -  《-》

Photocatalytic degradation of phenol in aqueous solutions by Pr-doped TiO2 nanoparticles.

Chiou CH ，Juang RS 《JOURNAL OF HAZARDOUS MATERIALS》

Electrospun nanofibers of Bi-doped TiO2 with high photocatalytic activity under visible light irradiation.

Bi-doped TiO(2) nanofibers with different Bi content were firstly prepared by an electrospinning method. The as-prepared nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence spectra (PL), and UV-vis diffuse reflectance spectroscopy (DRS). The results indicated that Bi(3+) ions were successfully incorporated into TiO(2) and extended the absorption of TiO(2) into visible light region. The photocatalytic experiments showed that Bi-doped TiO(2) nanofibers exhibited higher activities than sole TiO(2) in the degradation of rhodamine B (RhB) and phenol under visible light irradiation (λ>420 nm), and 3% Bi:TiO(2) samples showed the highest photocatalytic activities.

Xu J ，Wang W ，Shang M ，Gao E ，Zhang Z ，Ren J ... -  《-》

Enhanced photocatalytic activity of S-doped TiO2-ZrO2 nanoparticles under visible-light irradiation.

Tian G ，Pan K ，Fu H ，Jing L ，Zhou W ... -  《-》

Photoinduced hydroxyl radical and photocatalytic activity of samarium-doped TiO(2) nanocrystalline.

Xiao Q ，Si Z ，Zhang J ，Xiao C ，Tan X ... -  《JOURNAL OF HAZARDOUS MATERIALS》