【摘要】 采用化学沉淀法和反应法制备了CdS-TiO₂（C-T）复合材料，性能评价结果表明，当CdS质量分数达到30%时，即C-T（Ⅳ），其光催化分解N₂O的性能最佳。在此基础上制备了系列Au/C-T（Ⅳ）催化剂，对比CT（Ⅳ），Au表面改性后的C-T（Ⅳ）复合材料的光催化活性得到了明显的提高。实验结果表明，Au合适的负载量（质量分数）为0.8%，即Au（0.8）/C-T（Ⅳ），其光催化性能与UV-vis的表征结果基本吻合。XRD分析结果表明，C-T（Ⅳ）和Au（0.8）/C-T（Ⅳ）的特征衍射峰均较强，表明晶化程度较好，同时Au（0.8）/C-T（Ⅳ）样品的XRD图中未出现Au的特征衍射峰，可能由于Au的负载量较低，Au在C-T（Ⅳ）表面分布比较均匀。更多还原

【Abstract】 The composites of CdS-TiO₂（C-T） were prepared by using chemical precipitation and reaction methods. The performance evaluation results showed that the performance on photocatalytic decomposition of N₂O was the best when the mass fraction of CdS reached 30%, i.e. C-T（Ⅳ）. On this basis, a series of catalysts of Au/C-T（Ⅳ） samples were prepared, and the results showed that the photocatalytic activity of the C-T（Ⅳ） composites was significantly improved through modifying its surface with Au by impregnation method. The experimental results indicated that the appropriate loading amount for Au on C-T（Ⅳ） was mass fraction 0.8%, i.e. Au（0.8）/C-T（Ⅳ）. The photocatalytic performance of composite metal oxides was basically consistent with the characterization results of UV-vis. XRD results showed that the characteristic diffraction peaks of C-T（Ⅳ） and Au（0.8）/C-T（Ⅳ） were both strong, indicating a good degree of crystallization. In addition, there was no characteristic diffraction peak of Au in the XRD pattern over Au（0.8）/C-T（Ⅳ） sample, which was possible due to the low loadings of Au as well as the distribution of Au on the surface of C-T（Ⅳ） was relatively uniform.更多还原