| Ag改性纳米ZnO薄膜及光催化活性 | |
| Silver Modified ZnO Thin Films and Their Photocatalytic Activity | |
| 摘要: 采用溶胶-凝胶法和光还原沉积贵金属法结合制备出Ag改性的纳米ZnO薄膜。利用FESEM、XPS、ESR、UV-Vis分析了纳米Ag-ZnO薄膜的表面形貌、表面组成和光谱特征。FESEM分析表明银在纳米ZnO薄膜表面形成原子簇而没有形成均匀覆盖层。XPS分析表明负载在纳米ZnO薄膜表面的银以Ag0形式存在； 相对于纳米ZnO薄膜， 纳米Ag-ZnO薄膜中晶格氧的含量有所下降，而表面羟基氧和吸附氧的含量显著增加。纳米Ag-ZnO薄膜的ESR峰强比纳米ZnO薄膜大，表明纳米Ag-ZnO薄膜中束缚单电子的氧空位的浓度高于纳米ZnO薄膜。UV-Vis分析纳米Ag-ZnO薄膜的紫外可见吸收光谱可能是纳米银粒子与纳米ZnO薄膜共同作用的结果。以甲基橙为模拟污染物，考察了纳米Ag-ZnO薄膜的光催化活性以及银沉积量对催化剂活性的影响。光催化降解结果表明，银的沉积量为0.018 2 mg·cm-2的纳米Ag-ZnO薄膜的光催化活性最高，在紫外光照射3 h后甲基橙降解率约为78%，而纳米ZnO薄膜约为62%。 | |
| 关键词: 银 氧化锌薄膜 光沉积 光催化 | |
| 基金项目: | |
| Abstract: Silver-modified nano-ZnO films were prepared by the sol-gel and photodeposition method. Their optical characteristics, surface morphology and surface states were analyzed by FESEM, XPS, ESR, UV-Vis. FESEM results show that silver particles form the clusters on the surface of the nano-ZnO film instead of covering the surface. The X-ray photoelectron spectroscopy(XPS) results show that the oxidation state of the silver loaded on the nano-ZnO film is Ag0, the content of absorbed oxygen(Oa) and hydroxyl oxygen(OH) on the surface of nanometer Ag-ZnO film is increased and the lattice oxygen(Ol) is decreased in contrast to that of the pure nano-ZnO film. The nanometer Ag-ZnO film could bring about higher intensity of oxygen vacancy than nano-ZnO film with ultraviolet illumination according to the ESR spectroscopy results. The UV-Vis absorption spectrum of the nanometer Ag-ZnO film may be a combination of the spectrum of nano-Ag particles and nano-ZnO film. The photocatalytic activity of the film was tested using methyl orange as the model reaction under the irradiation with ultraviolet light. The results indicate that the decolorization proportion of methyl orange is 78% when using the nanometer Ag-ZnO film at a Ag loading of 0.018 2 mg·cm-2, while the decolorization proportion of methyl orange is 62% when using pure nanometer ZnO film. | |
| Keywords: silver zinc oxide film photodeposition photocatalysis | |
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| 韩 婧,施利毅,成荣明,陈奕卫,董鹏飞,邵启伟.Ag改性纳米ZnO薄膜及光催化活性[J].无机化学学报,2008,24(6):950-955. | |
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