【摘 要】
：
研究了NH3气氛热还原处理两种TiO2光催化剂的形态(ATiO2,BTiO2)及其活性,400和500℃处理2 h的催化剂均显示黄色,而600℃以上处理则显示深灰色.以XRD、UV-Vis分析了NH3处理TiO
【机 构】
：
中国科学技术大学化学与材料科学学院,安徽建筑工业学院环境工程系,中国科学院生态环境研究中心
【基金项目】
：
the Science and Technology Foundation of Ministry of Construction;the Excellent Youth Foundation of Anhui Province;国家自然科学基金;the Important Foundation of Anhui Science and Technology Department;安徽省教育厅自然
论文部分内容阅读
研究了NH3气氛热还原处理两种TiO2光催化剂的形态(ATiO2,BTiO2)及其活性,400和500℃处理2 h的催化剂均显示黄色,而600℃以上处理则显示深灰色.以XRD、UV-Vis分析了NH3处理TiO2的结构,XRD表明ATiO2催化剂以锐钛矿和金红石混合晶型存在,而BTiO2只有锐钛矿型.UV-Vis结果发现NH3处理的两种TiO2在可见光区域都有很强的吸收.以甲基橙和苯酚研究了紫外光和太阳光下的光催化活性,结果表明NH3处理对两种不同制备方法的TiO2光催化活性影响存在显著差异,ATiO2随氨热处理温度提高活性降低,甲基橙50 min脱色率由400℃样品的100%逐步降到700℃样品的37%;而BTiO2随处理温度提高活性增加,甲基橙50 min脱色率由400℃样品的29%逐步提高到700℃样品的88%.在可见光下,ATiO2的活性与紫外光下规律相似,而BTiO2除了500℃样品外几乎都没有活性.最后对经过NH3处理的与未经处理的BTiO2活性进行了比较,发现NH3处理导致BTiO2光催化活性显著降低.
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