Enhanced visible-light photocatalytic activity of active Al2O3/g-C3N4 heterojunctions synthesized via surface hydroxyl modification

Can environmental pharmaceuticals be photocatalytically degraded and completely mineralized in water using g-C3N4/TiO2 under visible light irradiation?—Implications of persistent toxic intermediates

“…These RSs directly oxidized and decomposed acyclovir, while • OH only played a minor role in this visible light driven system [49,50]. The finding that h + and O 2 • − act as the main RSs in the photocatalytic degradation of organics generally aligns with other research that has used g-C 3 N 4 -based photocatalysts [51,52]; however, • OH was found to be dominantly responsible for acyclovir degradation in the UV/TiO 2 system in our previous work [12]. These different results imply that the presence of g-C 3 N 4 with a TiO 2 photocatalyst can significantly affect the physic-chemical properties of hybrid photocatalysts and influence main RSs in the photocatalytic organic treatment process.…”

Melamine modified P25 with heating method and enhanced the photocatalytic activity on degradation of ciprofloxacin

“…For instance, SiO 2 /g-C 3 N 4 [17], Ag-AgBr/g-C 3 N 4 [18], g-C 3 N 4 /BiOCl [19,20], g-C 3 N 4 /ZnO [21], A g-C 3 N 4 -CdS [22], g-C 3 N 4 -TiO 2 [23][24][25], g-C 3 N 4 /Bi 2 WO 6 [26], g-C 3 N 4 -Co 3 O 4 [27], g-C 3 N 4 -Ag 3 PO 4 [28], N TiO 2 /g C 3 N 4 [29], Al 2 O 3 /g-C 3 N 4 [30], et al All these researches of g-C 3 N 4 sensitive or modified or composited or heterojunction could give the positive results in photocatalysis, it was also identified that the g-C 3 N 4 as the organic photocatalytic material could effectively enhance the photocatalytic activity of photocatalysts. However, among the compounded types, maybe due to the better properties of TiO 2 , the g-C 3 N 4 -TiO 2 was widely investigated.…”

“…were respectively employed as the scavengers for hole (h + ), electron (e -), superoxide anion radical (·O 2 -) and hydroxyl free radical (·OH) [30,39], and the results were followed in Figure 8. It is easy to seen that the scavengers of TEOA, IPA and Ethanol were greatly decreased the degradation rates of ciprofloxacin, and indicating that the ·OH, h + and e -are the main reactive species in the degradation process.…”

Enhanced light harvesting and electron collection in quantum dot sensitized solar cells by TiO2 passivation on ZnO nanorod arrays

“…It is clearly revealed that the (-OH)t/(-OH)0 ratio significantly decreases after TiO2 modification, indicating that the amount of -OH groups adsorbed on the ZnO surface is reduced with surface treatment. According to previous reports [17,26,27], the number of dangling bonds is inversely related to the stability of the material. Chemisorbed hydroxyl groups may directly reduce stability and also counteract the heterojunction formation process.…”