Graphitic carbon nitride with S and O codoping for enhanced visible light photocatalytic performance

Abstract

Facile synthesis of the S, O codoped g-C3N4 photocatalysts.

g-C3N4-Based Nanomaterials for Visible Light-Driven Photocatalysis

“…Doping by metals such as Cu and Fe [224][225][226], non-metals such as B, C, O, or S [224,[227][228][229][230][231], and co-doping [232][233][234] have all been employed for environmental depollution applications. For example, S and O co-doped g-C3N4 prepared by melamine polymerization and subsequent H2O2 activation prior to trithiocyanuric acid functionalization (Figure 21a) enhanced the photocatalytic degradation of RhB (Figure 21b) 6-fold relative to the parent g-C3N4 nanosheet [235]. Doping resulted in a strongly delocalized HOMO and LUMO that increased the number of active sites and improved the separation of photogenerated electrons and holes.…”

The effect of metallic Fe(ii) and nonmetallic S codoping on the photocatalytic performance of graphitic carbon nitride

“…3, in which the typical characteristic peaks at 1312, 1390, 1534, and 1625 cm À1 can be assigned to the stretching modes of the aromatic C-N heterocycle and peak at 805 cm À1 is ascribed to the breathing mode of the triazine units. [25][26][27][28] The peak at 1228 cm À1 represents the stretching vibration of C-NH-C bridges. 28 This demonstrates that the original graphitic C-N network in the structure of g-C 3 N 4 is kept intact upon doping.…”

One-pot construction of Cu and O co-doped porous g-C3N4 with enhanced photocatalytic performance towards the degradation of levofloxacin

“…The doped O can improve the absorption of Cu/O-PCN-3 in the visible light region by modifying the electronic and microscopic structure through the partial substitution of the N atoms. 53,54 The doped Cu 2+ /Cu + can serve as a temporary efficient electron capturing centers because of its reduction potential (+0.17 eV/ vs. NHE) existing between the E CB and E VB of Cu/O-PCN-3. 42,55 Under visible light irradiation, the electrons can be excited into the CB of Cu/O-PCN-3, while the holes remain in its VB.…”