Abstract
Considering the accelerated charge/mass transfer and the formation of active defects at the heterointerface, La-ZnO/g-C3N4 heterogeneous photocatalysts were facilely prepared via a two-step route consisting of hydrothermal and calcination processes in this work. The combination of La3+ doping in ZnO and the contact between La-ZnO and g-C3N4 endowed the heterogeneous composite with a much enhanced photocatalytic activity towards methyl blue (MB) dye decolorization under the visible light irradiation. It was found that La-ZnO/g-C3N4-4.6 showed an optimal degradation rate of MB (8.72 × 10− 2 min− 1), which is 14 times higher than that of pure g-C3N4 (6.23 × 10− 3 min− 1) under the same experimental conditions. The improved photocatalytic MB decolorization is attributed to the increased interfacial electron-hole separation efficiency through constructing La-ZnO/g-C3N4 heterogeneous interfaces. The present study manifests the advantage of heterogeneous interfaces as the charge carrier separation pathway towards boosting photocatalytic activity.
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