| 氧化锌/镁铝复合氧化物的制备及光催化性能 |
| Preparation and Photocatalytic Activity of ZnO/Mg-Al Mixed Oxides |
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| 摘要: 将镁铝层状双氢氧化物分散在锌盐与尿素的混合液中，加热使尿素水解、锌离子沉淀，经洗涤、干燥、煅烧，再用碳酸钠溶液浸渍、煅烧，得到还原后的氧化锌/镁铝复合氧化物。用X-射线衍射(XRD)、透射电子显微镜(TEM)、氮等温吸附和傅里叶红外光谱(FTIR)等方法对所制备的氧化锌/镁铝复合氧化物的结构和性能进行了表征。以酸性红G为模型污染物评价了其去除效率及光催化活性。碳酸钠还原处理过的氧化锌/镁铝复合氧化物结构发生了改变，氧化锌的晶粒变小，复合氧化物变成了片状结构，其对酸性红G的去除效率也明显提高，质量比为2∶1的氧化锌/镁铝复合物经还原后表现出了良好的光催化活性。 |
| 关键词: 光催化 吸附 氧化锌 层状双氢氧化物 |
| 基金项目: |
| Abstract: Mg-Al layered double hydroxides with carbonate anions (Mg-Al-CO3-LDHs) were dispersed into a mixed solution of zinc salt and urea. Upon heating, the hydroxide ions released by the urea hydrolysis promoted the precipitation of zinc ions in the solution, and ZnO/Mg-Al mixed oxides were obtained after washing, drying and calcining. The ZnO/Mg-Al mixed oxides were restructured by soaking in Na2CO3 solution and the restructured ZnO/Mg-Al mixed oxides(re-ZnO/LDHs)were obtained after subsequent calcination. The nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), nitrogen adsorption-desorption, and Fourier transform infrared spectra (FTIR). The removal efficiencies and the photocatalytic activities of the nanocomposites were investigated by the degradation of acid red G aqueous solution. After the reduction treatment by Na2CO3, the grain size of the ZnO decreased and the shape of the Mg-Al mixed oxides in re-ZnO/LDHs changed into the sheet-like structure. The removal efficiencies of them increased apparently and the re-ZnO/LDHs with a mass ratio of 2∶1 had a better photocatalytic activity. |
| Keywords: photocatalysis adsorption ZnO layered double hydroxide |
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| 袁素珺,张青红,李耀刚,王宏志.氧化锌/镁铝复合氧化物的制备及光催化性能[J].无机化学学报,2009,25(11):1977-1981. |
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