Hybridization of Cd_0.2Zn_0.8S with g-C₃N₄nanosheets: a visible-light-driven photocatalyst for H₂evolution from water and degradation of organic pollutants

Abstract

Novel visible-light-driven Cd0.2Zn0.8S/g-C3N4 inorganic-organic composite photocatalysts were synthesized by a facile hydrothermal method. The prepared Cd0.2Zn0.8S/g-C3N4 composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible diffuse reflection spectroscopy (DRS), photoluminescence (PL) spectroscopy and photoelectrochemical (PEC) experiments. Under visible-light irradiation, Cd0.2Zn0.8S/g-C3N4 photocatalysts displayed a higher photocatalytic activity than pure g-C3N4 and Cd0.2Zn0.8S for hydrogen evolution and degradation of pollutants, and the optimal g-C3N4 content was 20 wt%. The optimal composite showed a hydrogen evolution rate of 208.0 μmol h(-1). The enhancement of the photocatalytic activity should be attributed to the well-matched band structure and intimate contact interfaces between Cd0.2Zn0.8S and g-C3N4, which lead to the effective transfer and separation of the photogenerated charge carriers. Furthermore, the Cd0.2Zn0.8S/g-C3N4 photocatalysts showed excellent stability during photocatalytic hydrogen evolution and degradation of pollutants.

A metal–organic framework-derived Zn1−xCdxS/CdS heterojunction for efficient visible light-driven photocatalytic hydrogen production

“…4b), the peaks corresponded to the typical binding energies of the Zn 2+ oxidation states (centered at 1044.5 eV and 1021.5 eV). [39][40][41] From Fig. 4c, the XPS spectrum of Cd 3d shows that two peaks at 411.9 eV and 405.1 eV are attributed to the Cd 3d 3/2 and Cd 3d 5/2 of ZCS-C-3, respectively, which are in agreement with the literature data for Cd 2+ in CdS.…”

Immobilization of g-C3N4 nanosheets on diatomite via electrostatic adsorption and their photocatalytic activity

“…9d shows three different peaks centered around 397.8 eV, 399.7 eV and 403.5 eV, which are derived from the sp 2 -hybridized nitrogen of N-C]N, the tertiary nitrogen of N-(C) 3 , and the p-excitation in the C-N groups, respectively. [49][50][51] In the terms of N1s in the hybrid S 15 , the corresponding peaks shi to 398.0 eV, 400.2 eV and 403.6 eV, which may be attributed to the interaction role of SCN and diatomite. Photocatalytic degradation of model pollutants over different photocatalysts were evaluated under visible light irradiation (l > 400 nm).…”

Fabrication of WO2.72/UiO‐66 nanocomposites and effects of WO2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study

“…S3a), two binding energy values are observed, i.e. 530.6 eV due to W–O bonds in WO 2.72 and 531.9 eV due to H–O or C–O bonds from residual oxygen‐containing groups . The high resolution XPS C1s spectrum in Fig.…”

“…530.6 eV due to W-O bonds in WO 2.72 and 531.9 eV due to H-O or C-O bonds from residual oxygen-containing groups. 41 The high resolution XPS C1s spectrum in carbon components on the phenyl and the carboxylate groups of the organic linkers, respectively. 38 High resolution XPS spectra of the Zr 3d spectrum of WO 2.72 /UiO-66 ( Fig.…”