煅烧温度、时间和气氛对BiOBr结构和光催化性能的影响

材料热处理学报, 2015, 36(5): 10-16.

煅烧温度、时间和气氛对BiOBr结构和光催化性能的影响

1.江西理工大学冶金与化学工程学院,江西赣州 341000;福州大学能源与环境光催化国家重点实验室,福建福州350002

2.江西理工大学冶金与化学工程学院,江西赣州,341000

3.江西理工大学冶金与化学工程学院,江西赣州,341000

4.江西理工大学冶金与化学工程学院,江西赣州,341000

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

关键词： BiOBr , 煅烧气氛 , 相转变 , 光催化 , 结构和性能

Influence of calcination process on structure and photocatalytic performance of BiOBr

Keywords： BiOBr , calcination atmosphere , phase transformation , photocatalysis , structure and activity

BiOBr为受热不稳定的半导体.研究了煅烧温度、时间和气氛对BiOBr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BiOBr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BiOBr的结晶度和光催化活性;在煅烧温度高于520℃时,BiOBr发生BiOBr→ Bi24O31Br10的转变,在600 ～ 650℃煅烧,可产生BiOBr/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.

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