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-GelZnTiO₃-TiO₂heterojunctionphotocatalystrecombination efficiency

作者	单位	E-mail
张文海	河北工业大学土木与交通学院, 天津 300401	zwhxs1024@163.com
吉庆华	清华大学水质与水生态研究中心, 北京 100084 中国科学院生态环境研究中心, 北京 100085
兰华春	清华大学水质与水生态研究中心, 北京 100084 中国科学院生态环境研究中心, 北京 100085
李静	河北工业大学土木与交通学院, 天津 300401	tdhjlj@163.com

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.

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