TY - JOUR
T1 - Z-scheme heterojunction of graphitic carbon nitride and calcium ferrite in converter slag for the photocatalytic imidacloprid degradation and hydrogen evolution
AU - Inoue, Takumi
AU - Chuaicham, Chitiphon
AU - Saito, Noritaka
AU - Ohtani, Bunsho
AU - Sasaki, Keiko
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - Graphitic carbon nitride/ converter slag (gCN/CS) composites were fabricated as photocatalysts by a simple co-calcination. The structural, optical, and physicochemical characteristics of graphitic carbon nitride/ artificial converter slag (gCN/artCS) composites were investigated for the photocatalytic degradation of imidacloprid under visible light irradiation to optimize the mixing ratio of converter slag. The optimized gCN/artCS composite containing 11.58 % of artCS exhibited a 2.5 times faster rate of imidacloprid degradation over 120 min compared to pure gCN. The enhanced separation and transportation of photoinduced electrons and holes were revealed for the optimized gCN/artCS composite by the photoluminescence, impedance spectroscopy, and photocurrent densities. Furthermore, the energy-resolved distribution of electron traps (ERDT) pattern for the optimized composite strongly suggested the development of an interfacial Z-scheme heterojunction between gCN and iron oxide included in artCS, leading to reducing electron-hole pair recombination. Finally, the real CS was applied for the fabrication of the composite with gCN, and then the composite (gCN/realCS) was evaluated for H2 evolution. The H2 evolution rate over gCN/realCS did not come up to gCN/artCS but was greater than the pristine gCN. The reason is possibly due to lacking the electron trap states around 2.0–2.6 eV on the ERDT pattern for gCN/realCS. Thus, the present gCN/CS composites can be a potentially effective photocatalyst for hydrogen evolution under light irradiation.
AB - Graphitic carbon nitride/ converter slag (gCN/CS) composites were fabricated as photocatalysts by a simple co-calcination. The structural, optical, and physicochemical characteristics of graphitic carbon nitride/ artificial converter slag (gCN/artCS) composites were investigated for the photocatalytic degradation of imidacloprid under visible light irradiation to optimize the mixing ratio of converter slag. The optimized gCN/artCS composite containing 11.58 % of artCS exhibited a 2.5 times faster rate of imidacloprid degradation over 120 min compared to pure gCN. The enhanced separation and transportation of photoinduced electrons and holes were revealed for the optimized gCN/artCS composite by the photoluminescence, impedance spectroscopy, and photocurrent densities. Furthermore, the energy-resolved distribution of electron traps (ERDT) pattern for the optimized composite strongly suggested the development of an interfacial Z-scheme heterojunction between gCN and iron oxide included in artCS, leading to reducing electron-hole pair recombination. Finally, the real CS was applied for the fabrication of the composite with gCN, and then the composite (gCN/realCS) was evaluated for H2 evolution. The H2 evolution rate over gCN/realCS did not come up to gCN/artCS but was greater than the pristine gCN. The reason is possibly due to lacking the electron trap states around 2.0–2.6 eV on the ERDT pattern for gCN/realCS. Thus, the present gCN/CS composites can be a potentially effective photocatalyst for hydrogen evolution under light irradiation.
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U2 - 10.1016/j.jphotochem.2023.114644
DO - 10.1016/j.jphotochem.2023.114644
M3 - Article
AN - SCOPUS:85149291846
SN - 1010-6030
VL - 440
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
M1 - 114644
ER -