| 粉煤灰漂珠负载Bi2WO6复合材料的制备及光催化性能研究 |
| Synthesis of Bi2WO6/Fly Ash Cenospheres Composites with Enhanced Photocatalytic Properties |
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| 摘要: 以工业固体废弃物粉煤灰漂珠(fly ash cenospheres,FACs)为载体, 采用水热法制备了新颖的漂珠负载Bi2WO6复合材料(Bi2WO6/FACs),通过X射线衍射(XRD),扫描电子显微镜(SEM),X-射线光电子能谱(XPS),和紫外-可见漫反射光谱(DRS)技术对其进行了表征.XRD数据显示了正交相Bi2WO6的特征衍射峰.DRS结果证实了引入FACs后Bi2WO6对可见光的吸收增强.在可见光的照射下, 以亚甲基蓝溶液的光催化降解评价了Bi2WO6/FACs复合材料的光催化性能.结果表明:Bi2WO6/FACs的光催化性能优于纯Bi2WO6的, 其一级反应速率常数(k)为后者的2.4倍.尤其是由于漂珠质轻中空的特性, Bi2WO6/FACS复合光催化剂可长时间漂浮于水面, 既能充分吸收光能, 又有利于催化剂的回收和重复利用. |
| 关键词: 复合材料 Bi2WO6 粉煤灰漂珠 可见光 |
| 基金项目: 国家自然科学基金(No.51308282),中国博士后科学基金(No.2012M511254)和江苏省高校自然科学研究计划(No.12KJD610004)资助项目. |
| Abstract: A fly ash cenospheres supported Bi2WO6 composites (Bi2WO6/FACs) photocatalysts were prepared by a hydrothermal method. The composites were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectra (XPS), and UV-Vis diffused reflectance spectroscopy (DRS) techniques. The XRD patterns exhibited characteristic diffraction peaks of orthorhombic phase of Bi2WO6. The DRS results showed that the visible light absorption of the Bi2WO6/FACs composite is enhanced. The as-prepared material exhibited good photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation, and the first-order reaction rate constant (k) of 0.012 min-1 for Bi2WO6/FACs composite is higher than 0.004 8 min-1 of pure Bi2WO6. Moreover, the present study provides a useful strategy to design heterogeneous catalysis, in which catalytic materials are supported on fly ash cenospheres, an industrial solid waste produced from coal-firing power plants. |
| Keywords: composites Bi2WO6 fly ash cenospheres (FACs) visible-light |
| 投稿时间：2014-07-04 修订日期：2014-09-12 |
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| 全文下载次数: 1648 |
| 张进,崔皓,翟建平.粉煤灰漂珠负载Bi2WO6复合材料的制备及光催化性能研究[J].无机化学学报,2014,30(12):2857-2862. |
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