writer：Wei Liu, Mingliang Wang*, Chunsiang Xu, Shifu Chen*
keywords：synthesis of g-C3N4/ZnO, composite , photooxidation
source：期刊
specific source：Chem. Eng. J. 209, 386-393, 2012
Issue time：2013年
The composite photocatalyst g-C₃N₄/ZnO was synthesized by heat treatment of the precursor obtained via the deposition–precipitation method. The photocatalyst was characterized by XRD, SEM, TEM, DRS, and TA-PL. The photocatalytic properties of the photocatalyst were evaluated by photooxidation of RhB and photoreduction of Cr⁶⁺ under visible light irradiation. The results showed that the photocatalytic properties of the photocatalyst were much better than that of single C₃N₄ or ZnO. The optimal g-C₃N₄ content in the composite is 5.0 wt.%. Both photooxidation and photoreduction processes follow first-order kinetics. The photooxidation rate constant of RhB for g-C₃N₄(5.0 wt.%)/ZnO is 0.0367 min^?1, while it is only 0.0112 min^?1for pure C₃N₄. The photoreduction rate constant of Cr⁶⁺ for g-C₃N₄(5.0 wt.%)/ZnO is more than five times that observed for pure C₃N₄. The stability of the prepared photocatalyst in the photocatalytic process was also investigated. The enhanced visible photocatalytic properties originate from the injection of excited electrons from the CB of C₃N₄ to that of ZnO.