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中文摘要：
采用沉淀法制备了具有p-n异质结结构的AgBr/CuO可见光催化剂,对其结构进行了表征,通过甲基橙溶液的降解率评价了AgBr/CuO的光催化活性,并通过活性物种测试及能带结构分析推测了其光催化机理,采用3%（质量分数）溴水对使用后的AgBr/CuO进行了再生处理.结果表明,在可见光照射下,0.1 g AgBr/CuO光催化剂30 min对甲基橙溶液（初始浓度为15 mg/L）的降解率高达92%,远高于同等条件下的AgBr.AgBr/CuO光催化活性提高的原因是Ag Br与CuO的复合一方面使催化剂的禁带宽度变宽,提高了光生电子与光生空穴的氧化还原能力;另一方面,在两者之间形成了p-n型异质结结构,有利于光生电子的转移及光生电子与空穴的分离.采用绿色环保的溴水再生法可显著恢复催化剂的光催化活性.
英文摘要：
AgBr/CuO p-n heterojunction photocatalyst was prepared by precipitation method and characterized by X-ray diffraction（ XRD）,UV-Vis spectroscopy（ UV-Vis）,field emission scanning electron microscopy（ FESEM） and X-ray photoelectron spectroscopy（ XPS）,respectively. The photocatalytic mechanism was speculated through active species test and band structure analysis. Besides,the used AgBr/CuO was regenerated by 3%（ mass fraction） bromine water. The results show that the degradation rate of methyl orange（ c0= 15 mg / L） over 0. 1 g AgBr/CuO was maintained at 92% after 30 min,which was much higher than that over pure Ag Br under the same conditions. The reasons for improving the photocatalytic activity of AgBr/CuO photocatalyst are that the band gap of AgBr/CuO photocatalyst become wider and the p-n heterojunction structure is formed between Ag Br and Cu O. The wider band gap was benefit for the redox ability of photogenerated electrons and photogenerated holes. The p-n heterojunction structure of photocatalyst could accelerate the shift of electrons and the separation of e~--h~＋. In addition,the use of bromine water regeneration method could significantly restore photocatalytic activity.
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