表面光催化还原铁对TiO2/SiO2光催化活性的影响

中国有色金属学报, 2003, 13(3): 793-796.

表面光催化还原铁对TiO2/SiO2光催化活性的影响

黄琮 ^1, , 王良焱 ^2, , 徐悦华 ^3, , 李新军 ^4, , 郑少健 ^5, , 李芳柏 ^6,

1.中国科学院,广州能源研究所,广州,510070

2.中国科学院,广州能源研究所,广州,510070

3.中国科学院,广州能源研究所,广州,510070

4.中国科学院,广州能源研究所,广州,510070

5.中国科学院,广州能源研究所,广州,510070

6.中国科学院,广州能源研究所,广州,510070;广东省生态环境与土壤研究所,广东省农业环境综合治理重点实验室,广州,510650

基金项目: 广东省自然科学基金(010873) 广东省科技厅科技计划(A3040301)

关键词： TiO2/SiO2 , 表面还原 , Fe

Influence of Fe deposition on photocatalytic activity of TiO2/SiO2 composite photocatalyst

用表面光催化还原铁法对TiO2/SiO2复合氧化物进行改性, 并在改性后用XRD, TEM进行化学状态、晶体组成与颗粒大小分析.通过对亚甲基蓝的降解揭示表面光还原对催化剂活性的影响.结果表明: 经过表面光催化还原铁法改性的催化剂活性要高于未改性的, 随着表面还原Fe量的增加, 催化活性增加.但n(Fe)∶n(Ti)＞1.0%后, 催化性能急剧下降, 最佳值为1.0%.讨论了Fe杂质对光生载流子分离效率的影响及其影响光催化剂活性的机理.Fe3+和Fe2+共同存在, Fe3+是光生电子的捕获阱, Fe2+是光生空穴的捕获阱, 在二者的协同作用下, 载流子得到有效分离, 催化活性得到提高.

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