Visible-light-driven g-C3N4/Ti3+-TiO2 photocatalyst co-exposed {001} and {101} facets and its enhanced photocatalytic activities for organic pollutant degradation and Cr(VI) reduction

Construction of stable Ta 3 N 5 /g-C 3 N 4 metal/non-metal nitride hybrids with enhanced visible-light photocatalysis

“…As illustrated in Fig. 8b, the band gaps of Ta 3 N 5 and g-C 3 N 4 were evaluated to be 2.08 eV and 2.73 eV, respectively, which closely agree with the previous reports [34,26]. The energy band gaps of …”

“…From Fig. 8a, pure g-C 3 N 4 shows the absorbance from UV to visible range up to 460 nm due to its intrinsic band gap energy of 2.7 eV [26,47]. The absorption onset of Ta 3 N 5 with the band-gap value of 2.08 eV is found at approximately 620 nm, which exhibits the broad absorption region of visible-light [34].…”

“…5 Recently, a metal-free, graphite-like carbon nitride (g-C 3 N 4 ) has been extensively employed in environmental applications since Wang et al first reported its photocatalytic property under visible light irradiation for hydrogen or oxygen production by water splitting in 2009 [7,23,24]. This carbon nitride is thermally stable and has a narrow band gap of ~2.7 eV owing to the À-conjugated graphitic planes consisted of the sp 2 hybridization of the carbon and nitrogen, so it responds to visible light with wavelengths up to 460 nm [24][25][26]. However, the photocatalytic activity of individual g-C 3 N 4 is restricted because of the fast recombination of photogenerated electron-hole pairs, poor quantum efficiency and the relatively narrow range of photon-response (as it absorbs irradiation with wavelength shorter than 460nm only) [27].…”

“…Therefore, it is of great value to extend the light absorption of g-C 3 N 4 up to a larger portion of the available solar spectrum and retard the recombination of electron and hole. Material scientists have devoted their efforts to improve the photocatalytic activity of g-C 3 N 4 under visible light irradiation by coupling g-C 3 N 4 with other materials, in that the planer conjugation structure of g-C 3 N 4 can furnish a scaffold to anchor various substrates [26]. A large number of C 3 N 4 -based composite photocatalysts such as C 3 N 4 -TiO 2 [28], C 3 N 4 -SnS 2 [25], Co 3 O 4 -g-C 3 N 4 [23], C 3 N 4 -Bi 2 WO 6 [29] and C 3 N 4 -SrTiO 3 [30], etc have thence been synthesized.…”

Preparation, characterization and visible-light-driven photocatalytic activity of a novel Fe(III) porphyrin-sensitized TiO 2 nanotube photocatalyst

“…In the another hand, MB molecular are aromatic, and can form -stacking mutual effect with FeTCPP [16,[22][23][24]25,35]. So, the catalyst possess strong broadband absorption under visible light, and can extend the range of spectral response and increase the utilization rate of solar energy [25,26,[34][35][36]. Additionally, remarkable adsorption performance of the catalyst could also contribute to increase the density of MB molecules near the catalyst surface [ is because the weak bridging bonds could improve the degradation efficiency for FeTCPP/TNT catalyst [24,27,[29][30][31][32][37][38][39].…”