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OALib Journal期刊
ISSN: 2333-9721
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ag+/ag-tio2纳米空心球制备及其可见光催化性能*
Keywords: 复合材料,可见光催化剂,肖特基势垒,湿化学沉积法,二氧化钛纳米空心球
Abstract:
？在tio2/聚苯乙烯复合材料表面沉积硫化银,空气中煅烧制备了ag+/ag修饰的二氧化钛纳米空心球(ag+/ag-tio2纳米空心球,即ag+/ag-hts)。结果表明,所制备的ag+/ag-hts具有可见光催化降解甲基橙的活性,随着甲基橙的初始浓度降低其催化降解效率提高。肖特基势垒的形成有助于更多的空穴转移到材料的表面,增强其光催化效率;表面的ag+有助于电子的清除,防止光激电子与光激空穴复合。随着硫化银沉积数量的提高,ag+/ag-hts的可见光催化活性提高,其光催化降解甲基橙的反应具有假一级反应的动力学特征。使用25%ag+/ag-hts光催化剂,在可见光下照射2h甲基橙降解率高达70.6%。
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