Effects of Boron Doping on Photocatalytic Activity and Microstructure of Titanium Dioxide Nanoparticles

Abstract

Boron-doped TiO 2 nanoparticles were prepared by the sol-gel method and characterized by XRD, TEM, XPS, FT-IR, and UV-vis spectroscopy. XRD results showed that the doping of boron ions could efficiently inhibit the grain growth and facilitate the anatase-to-rutile transformation prior to the formation of diboron trioxide phase. FT-IR and XPS results revealed that the doped boron was present as the form of B 3+ in B-doped TiO 2 samples, forming a possible chemical environment like Ti-O-B. The lattice parameters at different boron contents and calcination temperatures indicated that B 3+ was likely to weave into the interstitial TiO 2 structure. The photocatalytic activity of the B-doped TiO 2 nanoparticles was evaluated by the photoregeneration of reduced nicotinamide adenine dinucleotide (NADH). All B-doped TiO 2 nanoparticles calcined at 500 °C showed higher photocatalytic activity than pure TiO 2 sample in the photocatalytic reaction of NADH regeneration under UV light irradiation. When the molar ratio of B to Ti was 5%, the TiO 2 nanoparticles could photocatalytically reproduce 94% NADH.

Boron doped TiO2 catalysts for photocatalytic ozonation of aqueous mixtures of common pesticides: Diuron, o-phenylphenol, MCPA and terbuthylazine

“…This effect has been previously reported for similar catalysts and 19 it has been attributed to the restrained TiO 2 crystal growing due to the existence of 20 large amount of boron [16,17,18]. 21…”

Optimization of boron-doping process of titania nanotubes via electrochemical method toward enhanced photoactivity

“…This is due to the fact that the ion radius of B(III) (0.023 nm) is much smaller than that of Ti(IV) (0.064 nm). Therefore, boron oxides existing at the surface of the material can easily incorporate into the crystalline framework of titania [21,34]. Figure 3a shows XRD spectra registered for boron-doped and pure titania layer.…”

“…Recently, doping of TiO 2 with boron has been widely studied in terms of its effect on the surface and the bulk structure which changes the ability of tailoring the bandgap, suppresses electron-hole pairs from recombination, and improves electron conductivity [21][22][23]. Some papers have reported that B-doped TiO 2 powders obtained by a modified sol-gel method showed a red-shifted absorption spectrum [24,25], while other studies concern increase in the bandgap energy of TiO 2 upon doping when H 3 BO 3 was used as a boron precursor because of the decrease of the crystal size after incorporation of boron atoms [21].…”

“…Some papers have reported that B-doped TiO 2 powders obtained by a modified sol-gel method showed a red-shifted absorption spectrum [24,25], while other studies concern increase in the bandgap energy of TiO 2 upon doping when H 3 BO 3 was used as a boron precursor because of the decrease of the crystal size after incorporation of boron atoms [21]. According to Bettinelli et al [21], boron used as a titania dopant could favor the transformation of anatase to rutile. On the other hand, Finazzi et al [26] reported that B atoms in the anatase crystal could occupy different positions and promote changes in the electronic structure of boron-doped TiO 2 that is in accordance to the results of density functional theory.…”

Synthesis of Ag/N-TiO2/SBA-15 Photocatalysts and Photocatalytic Reduction of CO2under Visible Light Irradiation

“…目前, Pt, Ru, Pd, Au 和 Ag 等贵金 属改性的 TiO 2 已广泛应用于光催化还原 CO 2 研究 中 [18,19] . 研究表明, N [20] , I [21] , C [22] , S [23] 和 B [24] 等非金属 的掺杂可以降低 TiO 2 的禁带宽度, 提高 TiO 2 的可见光 催化活性.…”