In order to synthesize a new effective composite photocatalyst,ZnO/g-C3N4 composite was prepared through calcination method.The mass fractions of ZnO in this composite were 0%,3%,5% and 7%,respectively.The photocatalytic performance of the composite samples toward Congo red pollutions under visible light irradiation was investigated.The results confirmed that compared with pure g-C3N4,all composite materials exhibited much better photocatalytic performance,and the optimal ZnO content was 5%.Within 60 minutes,10mg of this composite achieved a degradation rate of 72% for a high-concentration (40mg/L) Congo red solution,whereas pure g-C3N4 under identical conditions yielded only 54% degradation.First-order kinetic fitting curves revealed the highest catalytic rate of 0.0127 for the 5% composite material,representing a 1.65-fold increase over pure g-C3N4.The significantly enhanced photocatalytic degradation efficiency was attributed to the introduction of ZnO,leading the formation of the p-n heterojunctions within the material,which hugely depressed the combination of the photogenerated electrons-hole pairs.The ZnO/g-C3N4 prepared by this method exhibits promising application for degrading high concentration organic pollutants in wastewater.
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