Visible light active photocatalytic processes have gained much interest in removing the organic pollutants from wastewater. In this article, we report the ZnO prepared by a simple co-precipitation method and characterized by PXRD, FE-SEM, TEM, DRS, and FTIR. The photocatalytic activity of ZnO assisted by H₂O₂ was examined for the degradation of the aqueous solution of Crystal violet (CV) under visible light. The combination of ZnO and H₂O₂ has enhanced the activity compared to bare ZnO or H₂O₂ alone under visible light. The influence of H₂O₂, Catalyst amount, CV concentration and pH were studied. The ZnO nanostructures in the presence of H₂O₂ exhibited highest photodegradation rate of CV solution under alkaline pH. The observed photodegradation efficiency by the ZnO photocatalyst under visible light is due to the deep level defects within the band gap, which induced in the course of the preparation method of the ZnO nanostructures, which shifts the absorption wavelength band to the visible light region. The ZnO assisted by H₂O₂ maintained good photostability and repeatability after 4 cycles of degradation under visible light.

可见光活性光催化过程已引起人们对去除废水中有机污染物的浓厚兴趣。在本文中，我们报告了通过简单的共沉淀方法制备的ZnO，并通过PXRD，FE-SEM，TEM，DRS和FTIR对其进行了表征。在可见光下检查了H ₂ O ₂辅助的ZnO的光催化活性对结晶紫（CV）水溶液的降解。与单独的ZnO或H ₂ O ₂在可见光下相比，ZnO和H ₂ O ₂的组合具有增强的活性。H ₂ O ₂的影响，催化剂量，CV浓度和pH值进行了研究。在碱性条件下，H ₂ O ₂存在下的ZnO纳米结构在CV溶液中表现出最高的光降解速率。ZnO光催化剂在可见光下观察到的光降解效率是由于带隙内的深能级缺陷引起的，该缺陷是在ZnO纳米结构的制备方法过程中引起的，该缺陷将吸收波长带移到了可见光区域。在可见光下降解4个循环后，由H ₂ O ₂辅助的ZnO保持了良好的光稳定性和可重复性。