Synthesis of ZnO, g-C3N4 and ZnO/g-C3N4 composite and their photocatalytic activity under vilsible light irradiation
DOI:
https://doi.org/10.51316/jca.2020.034Keywords:
ZnO/g-C3N4 composites, visible light, photocatalysis, quencher, methylene blueAbstract
ZnO, C3N4 and ZnO/g-C3N4 composite were prepared for degradation of methylene blue (MB) under visible light irradiation. The obtained samples were characterized by N2 adsorption/desorption isotherm and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-vis DRS). The results showed that the ZnO/g-C3N4 composite had a lower surface area and pore volume than ZnO and g-C3N4. The bandgap energy of ZnO/g-C3N4 composite was 3.20 eV showing a slight decrease with that of pure ZnO (3.21 eV). The degradation of MB on g-C3N4 was higher than those of ZnO and ZnO/g-C3N4 composite in initial 40 min, but its degradation reaction rate was lower than those of ZnO and ZnO/g-C3N4 composite in 90 min. As the result, the ZnO/g-C3N4 composite exhibited the highest degradation efficiency (93.2 %) among the prepared samples. In addition, the effect of molar ratio of ZnO:g-C3N4 on photocatalytic activity and photocatalytic mechanism under visible light was investigated. The remarkable improvement photocatalytic activity of ZnO/g-C3N4 composite could be attributed to reduced recombination rate of photogenerated electron-hole pairs by the presence of g-C3N4 in the composite.
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