柠檬酸辅助水热法制备可见光高效去除甲基橙的Bi2WO6纳米片

催化学报 , 2011, 32(10): 1631-1638. doi: 10.3724/SP.J.1088.2011.10531

柠檬酸辅助水热法制备可见光高效去除甲基橙的Bi2WO6纳米片

陈渊 ^1, , 刘国聪 ^2, , 李志友 ^3, , 黄苏萍 ^4, , 周科朝 ^5,

1.玉林师范学院新材料研发和化学生物传感技术所,广西玉林537000;中南大学粉末冶金国家重点实验室,湖南长沙410083

2.玉林师范学院新材料研发和化学生物传感技术所,广西玉林537000;中南大学化学化工学院,湖南长沙410083

3.中南大学粉末冶金国家重点实验室,湖南长沙410083

4.中南大学粉末冶金国家重点实验室,湖南长沙410083

5.中南大学粉末冶金国家重点实验室,湖南长沙410083

基金项目: 广西自然科学基金(2011GXNSFA018049) 广西教育厅科研项目(200808 LX406) 玉林师范学院重点科研项目(2010YJZD 13;2011YJZD 14) 广西科学技术研究和开发项目(桂科攻10100003-2) 广西高校优秀人才资助项目(G2009033;G2009045) 国家自然科学基金(51162026)

关键词：钨酸铋 , 水热法 , 柠檬酸 , 纳米片 , 光催化 , 甲基橙

Citric Acid-Assisted Hydrothermal Synthesis of Bi2WO6 Nanosheets for Highly Efficient Degradation of Methyl Orange under Visible Light Irradiation

以Bi(NO3)3·5H2O和Na2WO3 ·2H2O为原料,以柠檬酸为络合剂,采用辅助水热法制备了Bi2WO6纳米片,运用X射线衍射、扫描电镜、场发射高分辨透射电镜、拉曼光谱、红外光谱和紫外-可见漫反射光谱等手段对样品进行了表征,并考察了该催化剂光催化去除甲基橙反应性能.结果表明,通过调节体系的pH值可制得结晶度良好的正交晶系钨铋矿型结构的Bi2WO6纳米片状晶体.柠檬酸的添加使得制备的Bi2WO6颗粒的拉曼光谱特征峰发生蓝移,紫外-可见光吸收边发生红移,其能带隙减小至2.55 eV.光催化反应结果表明,催化剂制备时体系pH值是影响其可见光催化活性的主要因素,pH=7.0时制备的Bi2WO6纳米片光催化效率最高,可见光照射15 min,浓度为10 mg/L甲基橙溶液的降解率可达到100％,且循环使用5次后,其光催化活性并没有明显降低,表明Bi2WO6是一种稳定有效的可见光催化剂.

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