掺硼氧化银光催化剂制备及降解模拟印染废水

Preparation and application of boron-doped Ag_2O photocatalyst for degradation of simulated dyeing wastewater

采用离子交换共沉淀法制备掺硼氧化银光催化剂并进行相应表征,以甲基橙为降解对象对其光催化氧化性能进行考察,并将其用于可见光下降解多种有机物及模拟印染废水。实验结果表明：掺硼氧化银光催化剂能带带隙为1.29e V,具有很好的光催化氧化-还原能力,可见光下降解甲基橙,光照120 s可实现甲基橙完全降解;重复使用活性保持稳定;对不同有机物均可实现光催化氧化完全降解;模拟印染废水降解实验证实,在p H值5～10范围内,可见光照射下氧化银光催化剂在25 min内可实现混合染料的完全降解。掺硼氧化银是一种具有应用前景的可见光光催化剂。

In this study,a new photocatalyst,B-doped Ag_2O,was synthesized using a facile ion-exchange method. The product was characterized and was applied for the photodegradation of some typical organic pollutants and simulated dyeing wastewater under visible light irradiation. The results showed that B-doped Ag_2O was a superb photocatalyst having a band gap of 1. 29 e V,and can completely decompose methyl orange in 120 s.The performance of B-doped Ag_2O did not degrade after recycling. Typical organics such as rhodamine B,methylene blue,and phenol,and simulated dyeing wastewater were used as targets of photodegradation using B-doped Ag_2O. The results confirmed the broad application of B-doped Ag_2O as photocatalyst since different organic pollutants can be completely decomposed under different conditions. Thus,it can be concluded that B-doped Ag_2O is a promising photocatalyst for future applications.