Synchronous synthesis of S-doped carbon nitride/nickel sulfide photocatalysts for efficient dye degradation and hydrogen evolution

Green Synthesis Strategy of Template-Free S-Doped g-C3N4 with Cystine for Efficient Photocatalytic Degradation of RhB

“…One peak centered at 808 cm –1 can be assigned to the breathing vibration of the triazine structure in g-C 3 N 4 . The absorption peaks located at 1258–1480 cm –1 resulted from characteristic stretching vibrations of C–N, and the minor peaks in the range of 1570–1600 cm –1 attributed to stretching modes of the CN bond. , Similar with the XRD results, these characteristic FTIR peaks representing g-C 3 N 4 remain unchanged in all catalysts as well, indicating the crystal structure remained even after exfoliation and S doping, which agrees well with the XRD results . Moreover, the band around 3100 cm –1 is assigned to N–H vibration, corresponding to the unpolymerized amino groups in the catalysts .…”

“…For a better understanding of the nature of S doping, a high-resolution S 2p spectrum of GCN-3% is displayed in Figure d. By deconvolution, one peak at 163.78 eV can be found, indicating substitution of N atoms by S atoms in the g-C 3 N 4 structure and thus giving rise to C–S bonds. ,− …”

“…Simulate computation further demonstrated that sulfur doping could generate high spin density and charge density of g-C 3 N 4 , giving rise to the decrease of bandgap from 1.17 to 1.03 eV. Zhou et al prepared S-doped g-C 3 N 4 catalysts with an RhB removal rate of up to 98.5% within 15 min. The visible absorption spectra of the catalysts were redshifted and showed a new visible-light absorption band via n→π* electron leap.…”

Green and alcohol-free H2O2 generation paired with simultaneous contaminant treatment enabled by sulfur/cyano-modified g-C3N4 with efficient oxygen activation and proton adsorption

“…S6, † the S 2p spectra exhibit two peaks at around 164.0 and 168.43 eV, corresponding to the C-S bond and surface adsorbed sulfate, respectively. 35 Furthermore, a shift to a lower binding energy could be observed for the C-S bond, confirming the C-S bond emerging with the S doping at the N position. 36,37 In addition, a slightly increasing trend was observed for O 1s peaks that may be attributed to the higher O 2 adsorption capacity of the sample (Fig.…”

Pyridine-amide-based hetero-copper iodide for the photocatalytic degradation of dyes and aerosol discolouration of VOC gases

“…40 M–S curves with a positive slope were measured at pH = 1, using an Ag/AgCl electrode, confirming that all the two prepared hetero-copper iodides are n-type semiconductors. 41,42 Using the standard hydrogen electrode potential at pH = 7 as a reference standard, the flat-band potentials ( E FB ) of CP 1 and solvent-free CP 2 were converted to −0.63 eV and −0.54 eV, respectively (Fig. S5c and d, ESI†), where E FB is approximately equal to E CBM , and the valence bands are +2.05 eV and +1.91 eV, calculated by the equation E g = E VBM − E CBM .…”