樊启哲,余长林,周晚琴,李家德

• 1:江西理工大学冶金与化学工程学院
• 2:福州大学能源与环境光催化国家重点实验室

摘要(Abstract)：

Bi OBr为受热不稳定的半导体。研究了煅烧温度、时间和气氛对Bi OBr结晶度、表面羟基和相变影响。然后考察了催化剂结构变化对可见光催化降解染料酸性橙Ⅱ的活性影响。利用X射线衍射、扫描电镜、紫外可见漫反射光谱、红外光谱等对不同煅烧条件处理后的Bi OBr样品进行了结构、形貌等分析。结果表明,空气气氛下,500℃以下的煅烧处理,可以明显提高Bi OBr的结晶度和光催化活性;在煅烧温度高于520℃时,Bi OBr发生Bi OBr→Bi24O31Br10的转变,在600~650℃煅烧,可产生Bi OBr/Bi24O31Br10混合相,大幅度提高可见光催化活性;在750℃煅烧生成的α-Bi2O3虽然具有较好的可光吸收性能,但是颗粒发生烧结,可见光活性很低。真空气氛煅烧虽然可以提高结晶度,但易导致表面脱羟基,不利于光催化活性的大幅度提高。

关键词(KeyWords)： BiOBr;煅烧气氛;相转变;光催化;结构和性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(21067004,21263005);; 江西省教育厅高等学校科技落地计划项目(KJLD14046);; 江西省自然科学基金青年科学基金计划(20133BAB21003);; 江西省青年科学家培养项目(20122BCB23015)

作者(Author): 樊启哲,余长林,周晚琴,李家德

DOI: 10.13289/j.issn.1009-6264.2015.05.003

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