ZnO/g-C3N4光催化剂在微流控芯片中的光催化性能

采用浸渍法合成ZnO质量分数不同的ZnO/g-C₃N₄复合光催化剂，分析样品的结构、形态、化学组成和光学性能等. 将制备好的样品固定到微流控芯片中，降解不同的染料（亚甲基蓝、中性红、孔雀石绿、罗丹明B），评价样品在可见光下的光催化性能. 样品的表征结果表明，在ZnO/g-C₃N₄复合物中，ZnO、g-C₃N₄间存在相互作用，ZnO/g-C₃N₄复合物对可见光的利用更为充分；与g-C₃N₄相比，在ZnO/g-C₃N₄复合物中光生电子-空穴对的复合明显被抑制. 光催化实验结果表明，6 % ZnO/g-C₃N₄具有最佳光催化性能，在光照强度为60 klx，液体流速为20 μL/min时，其对罗丹明B溶液的降解效率为98.9%.多次循环后的光催化降解亚甲基蓝性能研究表明，样品在微流控芯片中进行光催化降解实验具有稳定性和可靠性.

Photocatalytic performance of ZnO/g-C3N4 composite photocatalysts in microfluidic reactors

The ZnO/g-C₃N₄ composite photocatalysts with different mass fractions of ZnO were synthesized by a simple impregnation method. The structure, morphology, chemical compositions and optical properties of the samples were analyzed. The as-prepared samples were fixed to microfluidic reactors, respectively. The photocatalytic performance of these reactors was evaluated by the degradation of different dyes (methylene blue, neutral red, malachite green, and rhodamine B) under visible light. The characterization indicated that there was an interaction between ZnO and g-C₃N₄ in the as-prepared composite. And the composite could make good use of visible light. Also, compared with g-C₃N₄, the recombination of photogenerated electron-hole pairs in the composite was obviously inhibited. The results of photocatalytic experiments displayed that 6% ZnO/g-C₃N₄ exhibited the best photocatalytic performance compared to other mass fractions of ZnO. When the light intensity was 60 klx and the liquid flow rate was 20 μL/min, the degradation efficiency of rhodamine B solution reached 98.9%. The photocatalytic degradation of methylene blue by multiple cycle tests was also studied, indicating the sample's stability and reliability when conducting photocatalytic degradation experiments in microfluidic reactors.