【摘要】 为避免农残处理过程中二次污染问题，我们积极地开展农药降解方面的相关研究。钒酸铋（BiVO₄）是一种易获得、高稳定性且安全低毒的n型半导体，具有优异的光吸收范围、微观结构易控制、纳米尺度适中、过滤后可回收利用等优点，广泛应用于光催化和光电催化领域，但其存在光生电子-空穴复合严重、量子产率低等问题。光沉积法简单易操作，在BiVO₄的不同晶面上担载助催化剂，进一步提高其光生电荷的分离和传输效率，显著提升光催化性能。我们选用“纳米材料+绿色农业”的光催化降解农药技术，实现太阳能到化学能的直接转化。在可见光条件下进行农药降解实验，对比BiVO₄,CoO_x/BiVO₄,Pt/BiVO₄和Pt/CoO_x/BiVO₄的光催化性能，确定BiVO₄光催化剂担载双助催化剂的最优组合。结果表明，在相同的外加电压下，Pt/CoO_x/BiVO₄的光电流响应最大，界面电荷转移电阻最小，展示了优异的电荷分离性质；Pt/CoO_x/BiVO₄降解最快，在360 min内降解完成，降解速率是BiVO₄本体的50倍。本研究通过晶面工程策略调控半导体光生电荷分离，对设计具有高活性光催化降解农药新体系具有指导意义。更多还原

【Abstract】 To avoid secondary pollution during the process of pesticide residue treatment, we actively research related pesticide degradation methods. Bismuth vanadate（BiVO₄） is an easily accessible, highly stable, and safe n-type semiconductor with excellent light absorption range, controllable microstructure, moderate nanoscale size, and recyclability after filtration. It is widely used in the fields of photocatalysis and photoelectrocatalysis, but it faces issues such as severe recombination of photogenerated electrons and holes, and low quantum yield. However, it has issues such as severe recombination of photogenerated electrons and holes, and low quantum yield. Photodeposition is a simple and easy-tooperate method that involves depositing cocatalysts on different crystal planes to further enhance the separation and transfer efficiency of photogenerated charges, significantly improving photocatalytic performance. We adopt a photocatalytic degradation technology for pesticides that combines "nanomaterials with green agriculture, " achieving direct conversion from solar energy to chemical energy. Under visible light conditions, we conducted pesticide degradation experiments comparing the photocatalytic performance of BiVO₄, CoO_x/BiVO₄, Pt/BiVO₄, and Pt/CoO_x/BiVO₄, identifying the optimal combination for BiVO₄ photocatalysts with dual cocatalysts. The results show that under the same applied voltage, Pt/CoO_x/BiVO₄ has the highest photocurrent response and the smallest interfacial charge transfer resistance, demonstrating excellent charge separation properties. Pt/CoO_x/BiVO₄ degrades the fastest, completing degradation in 360 minutes, with a degradation rate 50 times that of the BiVO₄ bulk. This study, through a crystal facet engineering strategy to control the separation of photogenerated charges in semiconductors, provides guidance for designing new highly active photocatalytic systems for pesticide degradation.更多还原