Quick and Facile Preparation of Visible light-Driven TiO2 Photocatalyst with High Absorption and Photocatalytic Activity

Abstract

Self-doping TiO2 has recently attracted considerable attention for its high photocatalytic activity under visible-light irradiation. However, the literature reported synthetic methods until now were very time-consuming. In this study, we establish a quick and facile method for obtaining self-doping TiO2 with the use of directly treated commercial P25 at a desired temperature for only 5 min through spark plasma sintering technology. With the using of this method, the modified P25 samples exhibit significantly high photoelectric and photocatalytic performance. Furthermore, the sample prepared at 600°C exhibits the optimum catalytic activity. The photodegradation and H2 evolution rates of this samples are significantly higher than those of unmodified P25 sample under visible-light irradiation. The physical origin of the visible-light absorption for the modified P25 samples is investigated in detail according to their structural, optical, and electronic properties. This work will provide a quick and facile method for the large-scale synthesis of visible-light driven photocatalyst for practical applications.

Visible Light Photocatalytic Activity of BiFeO3 Nanoparticles for Degradation of Methylene Blue

“…11,12 Nevertheless, TiO 2 can only be activated under UV light irradiation (< 380 nm) due to its wide band gap energy (3.2 eV) for the anatase phase and (3.0 eV) for the rutile phase which limits the effective use of solar energy. 13 This has consequent implications for the use of titania materials as solar or room-light activated catalysts, because majority of solar spectrum consists of 46% visible light and just about 3%-5% of UV light.…”

Improved electrode performance in microbial fuel cells and the enhanced visible light-induced photoelectrochemical behaviour of PtO @M-TiO2 nanocomposites

“…On the other hand, the modification of TiO 2 using the above materials results in thermal instability or an increase in the number of charge carrier recombination centers. Recently, Khan et al [10], Dong et al [11], Yang et al [12], and Zhu et al [13] reported that the formation of defects, such as Ti 3 þ states and/or oxygen vacancies, in TiO 2 facilitates absorption in the visible region. The presence of defects, such as Ti 3 þ and/or oxygen vacancies, appears to be a promising approach to improving the visible light absorption of TiO 2 [9,[10][11][12][13].…”

“…Recently, Khan et al [10], Dong et al [11], Yang et al [12], and Zhu et al [13] reported that the formation of defects, such as Ti 3 þ states and/or oxygen vacancies, in TiO 2 facilitates absorption in the visible region. The presence of defects, such as Ti 3 þ and/or oxygen vacancies, appears to be a promising approach to improving the visible light absorption of TiO 2 [9,[10][11][12][13]. This opens up a new way to utilize a larger part of the solar spectrum ( $ 43% visible light) compared to UV light only ( $ 5%) [1][2][3][4][5][6][7][8].…”

Glass capillaries with TiO 2 supported on inner wall as microchannel reactors

“…TiO 2 -based catalysts have been recognized as the most promising catalyst for photo-catalytic synthesis, photo-degradation of contaminated water and even photo-oxidation of organosulfur compounds in fuels, owning to their excellent properties such as high light-conversion efficiency, chemical stability, nontoxic nature and low cost [1][2][3][4][5][6][7][8][9][10]. Commercial TiO 2 catalysts are typically available in suspension mode (for example, Degussa P25 powder) or immobilized on a substrate.…”