In-situ synthesis of direct solid-state Z-scheme V2O5/g-C3N4 heterojunctions with enhanced visible light efficiency in photocatalytic degradation of pollutants

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

“…In light of the superiorities of Ta 3 N 5 and g-C 3 N 4 mentioned above, if metal-free g-C 3 N 4 couples with metal nitride Ta 3 N 5 to form hybrid materials, the photocatalytic activity of the Ta 3 N 5 /g-C 3 N 4 hybrid nitrides is 6 expected to be greatly enhanced by the synergistic effect. Moreover, the band edges of g-C 3 N 4 (E CB = -1.14 eV, E VB = 1.59 eV) match well with those of Ta 3 N 5 (E CB = -0.19 eV, E VB = 1.89 eV) overlapping band-structures [31,21]. The well-aligned straddling band structures in Ta 3 N 5 /g-C 3 N 4 hybrid nitrides can efficiently separate and transfer photogenerated electron-hole pairs, which releases the photogenerated holes accumulated on the Ta 3 N 5 , so the photostability of Ta 3 N 5 can be greatly improved.…”

“…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]. Compared with pure g-C 3 N 4 , the absorption abilities of Ta obtained from a plot of (±hv) 1/2 versus hv [31], and the band gap of Ta 3 N 5 was determined by a plot of (±hv) 2 versus hv [48]. As illustrated in Fig.…”

“…Where Ç are 4.73 and 5.35 for g-C 3 N 4 and Ta 3 N 5 , respectively [21,31]. E 0 is the energy of free electrons with the hydrogen scale (4.5 eV), and E g is the band gap energy.…”

Fabrication of a ternary plasmonic photocatalyst CQDs/Ag/Ag2O to harness charge flow for photocatalytic elimination of pollutants

“…Considering a more negative potential of Ag2O, given that the redox potential of O2/·O 2-is -0.046 eV, the CB electrons could not reduce the O2. Instead, together with the photoelectrons of Ag2O transferred to Ag, can via a one or two-electron reduction process reduce O2 to H2O2 or ·O 2-, respectively (O2 + e -= ·O 2-, -0.046 V vs NHE; O2 +2H + + 2e -= H2O2, 0.682 V vs NHE) [52,53]. The generation of H2O2 can be further converted •OH radicals by the subsequent reaction.…”

Fabrication of Ag3PO4/GO/NiFe2O4 composites with highly efficient and stable visible-light-driven photocatalytic degradation of rhodamine B

“…The Z-scheme mechanism reveals that the photocatalysts retain stronger oxidation and reduction ability, which deeply contribute to the improvement in photocatalytic activity. 82 The Fig. 8a).…”