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.

考虑到加速的电荷/质量转移和异质界面上活性缺陷的形成，本工作中通过水热和煅烧工艺组成的两步​​法轻松制备了La-ZnO / gC ₃ N ₄异质光催化剂。ZnO中的La ³⁺掺杂和La-ZnO与gC ₃ N ₄之间的接触相结合，使该异质复合物在可见光照射下对甲基蓝（MB）染料脱色的光催化活性大大增强。发现La-ZnO / gC ₃ N ₄ -4.6表现出最佳的MB降解速率（8.72×10 ^{− 2} min ^{− 1}），这是14高于纯GC倍₃ Ñ ₄（6.23×10 ^{- 3}分钟^{1 -}在相同的实验条件下）。改善的光催化MB脱色归因于通过构造La-ZnO / gC ₃ N ₄异质界面提高了界面电子-空穴分离效率。本研究表明异质界面作为电荷载体分离途径提高光催化活性的优势。