Effects of surface-modification with Bi2O3 on the thermal stability and photoinduced charge property of nanocrystalline anatase TiO2 and its enhanced photocatalytic activity

Synthesis, characterization, and activities of visible light-driven Bi2O3–TiO2 composite photocatalysts

“…Tel. : +86 To overcome the above two drawbacks, one of the most promising ideas is coupling TiO 2 with other narrow band gap semiconductors with matching band potentials [7][8][9][10][11][12][13][14][15][16][17], which can construct a heterojunction structure. In a coupled semiconductor system, the narrow band gap semiconductor can be excited by visible light irradiation and some of the photogenerated electrons or holes will then be transferred to TiO 2 vis heterojunction interface, leading to efficient charge separation.…”

“…In a coupled semiconductor system, the narrow band gap semiconductor can be excited by visible light irradiation and some of the photogenerated electrons or holes will then be transferred to TiO 2 vis heterojunction interface, leading to efficient charge separation. The extensively studied TiO 2 -based doped photocatalysts include Bi 2 WO 4 -TiO 2 [11], WO 3 -TiO 2 [12], ZnO-TiO 2 [13], FeTiO 3 -TiO 2 [14], SiO 2 -TiO 2 [15], Bi 2 O 3 -TiO 2 [16,17] and so on. Bi 2 O 3 is a significant metal-oxide semiconductor with a direct band gap 2.8 eV, which can be excited by visible light, but the photocatalytic activity of Bi 2 O 3 is low due to the photocorrosion and fast recombination of photogenerated electron-hole pairs [18].…”

Enhanced photo-induced charge separation and sun light-driven photocatalytic performance of g-C3N4 modified by phosphate

“…It is interesting to note that all modified samples have stronger SPS from 400 to 600 nm than g-C 3 N 4 , which indicates that the photo-induced electron-hole pairs after modifying g-C 3 N 4 by H 3 PO 4 can be separated effectively under the irradiation of visible light, which is beneficial to the photocatalytic performance under simulated sun light irradiation. According to the principle of SPS, the strong SPS response Enhanced photo-induced charge separation and sun light-driven photocatalytic performance of… corresponds to the high separation rate of photo-induced charge [11]. In visible light region, all modified samples exhibit increased SPS response, which indicates that phosphate alters the states of surface, causing many trapping states (surface net charges); surface net charge promotes the flow of electrons and holes in different direction, promoting the charge separation as shown in Fig.…”

Enhanced Photo-induced Charge Separation and Simulated Solar Photocatalytic Activity of α-Fe2O3/BiOCl Prepared In-situ

“…The scavengers used in this study are isopropanol (IPA) for •OH (28), ammonium oxalate (AO) for h + (29), and benzoquinone (BQ) for •O 2 -(30). As a consequence of quenching, photocatalytic decolorization efficiency of MO will be partly suppressed and the conversion of MO will be lower.…”