| ZnTiO3-TiO2复合光催化剂的制备及光催化降解有机污染物机制分析 |
| 摘要点击 2034 全文点击 715 投稿时间：2018-07-03 修订日期：2018-08-23 |
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| 中文关键词 溶胶凝胶法 ZnTiO3-TiO2 异质结 光催化剂 光生电子复合效率 |
| 英文关键词 Sol-Gel ZnTiO3-TiO2 heterojunction photocatalyst recombination efficiency |
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| 中文摘要 |
| TiO2光催化剂因无毒无害而在光催化降解污染物领域有巨大潜力.但由于TiO2的光生电子空穴复合较快，量子效率较低，限制了它的广泛使用.在本研究中，通过溶胶-凝胶（Sol-Gel）法制备了ZnTiO3-TiO2异质结复合光催化剂，分析了配比和煅烧温度对材料光催化性能的影响，以甲基橙（MO）溶液为模拟污染物进行光催化降解，探讨了其催化效果及效率提升的机制.结果表明，在紫外光照射下，ZnTiO3与TiO2比值为0.3时，在600℃下煅烧3 h后，其催化效果最佳且表现出良好的化学稳定性.通过光电流测试和电子自旋共振波谱仪的检测结果，证明复合光催化剂的光生电子和空穴复合率降低，从而提高了光催化活性. |
| 英文摘要 |
| TiO2 is a promising photocatalysis for degradation of organic pollutants due to its innocuity. However, its widespread practical application was hindered by the fast combination speed of photogenerated electron-hole pairs and low quantum efficiency. In this study, we prepared ZnTiO3-TiO2 using the Sol-Gel method to get heterojunctions, which exhibit efficient separation of photogenerated electron-hole pairs. The photocatalytic performances of various ZnTiO3-TiO2 were evaluated by the removal efficiency of Methyl orange. The experimental results showed that the ZnTiO3-TiO2(ZnTiO3:TiO2=0.3), which was calcinated under 600℃, had the best photocatalytic activity under ultraviolet light. The photocatalyst was stable under a wide range of pH (2.5-12.5). The photocurrent and ESR analysis verified the superior photocatalysis of ZnTiO3-TiO2, which was attributed to the efficient separation of electron-hole pairs induced by the heterojunctions. |
