HPA/Bi<sub>2</sub>WO<sub>6</sub>光催化剂的制备及其脱氮性能研究

陈颖; 邢宸; 姬生伦; 梁宏宝

HPA/Bi₂WO₆光催化剂的制备及其脱氮性能研究

1.
东北石油大学石油与天然气加工省重点实验室, 黑龙江大庆 163318;
2.
东北石油大学机械科学与工程学院, 黑龙江大庆 163318

基金项目: 国家自然科学基金（50476091）。

详细信息

通讯作者:
梁宏宝，Tel：18345995572，E-mail：xchen3294@126.com。

中图分类号: O63
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出版历程
- 收稿日期: 2014-05-22
- 修回日期: 2014-06-24
- 刊出日期: 2014-08-30

Preparation of HPA/Bi₂WO₆ and its photocatalytic properties for denitrification

1.
Provincial Key Laboratory of Oil & Gas Chemical Technology, Northeast Petroleum University, Daqing 163318, China;
2.
College of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China

摘要

摘要: 以Na₂WO₄·2H₂O和Bi（NO₃）₃·5H₂O为原料，通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控，将调控形貌后的催化剂固载不同种类杂多酸（HPA），再进行超临界流体干燥制得HPA/Bi₂WO₆光催化剂。并采用X射线衍射（XRD）、紫外-可见漫反射（UV-vis）、扫描电镜（SEM）、比表面积测定仪（BET）对所制备的催化剂进行表征，通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明，十二烷基硫酸钠（SDS）能起到更好的模板导向作用，从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥，可有效地避免孔塌陷、团聚等现象，进一步增大了催化剂的比表面积，其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点，从而显著提高了催化剂的催化活性，磷钨酸固载量为10%、剂油比为1：100时、氙灯光照3 h脱氮率可达92.08%。
- 杂多酸 /
- 钨酸铋 /
- 光催化 /
- 超临界流体干燥 /
- 脱氮
Abstract: The HPA/Bi₂WO₆ was prepared with Na₂WO₄·2H₂O, Bi(NO₃)₃·5H₂O and different surfactant templates. The prepared sample was dried by the supercritical fluid drying (SCFD) method. It was characterized with XRD, FT-IR and SEM techniques and N₂ sorption experiment. Its photocatalytic properties were evaluated with denitrification of nitrogen-containing simulated oil as model reaction. It was shown that the sodium dodecyl sulfate (SDS) should be chosen as template. With this template, a highly dispersed, crystalline and active photocatalyst was obtained. This catalyst had a larger specific surface area. The SCFD method effectively decreased pore collapse and particles agglomeration degree, consequently increasing the specific surface area and improving the catalytic performance. Immobilization of H₃PW₁₂O₄₀ on Bi₂WO₆ increased the surface acid sites, and hence the photocatalytic activity. When the H₃PW₁₂O₄₀ loading was 10%, about 92.08% of nitrogen in simulated oil were removed by shining for 3 h with a xenon lamp at the m_catalysts/m_simulated oil ratio of 1:100.
- heteropoly acids /
- Bi₂WO₆ /
- photocatalysis /
- supercritical fluid drying /
- denitrification

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