Photocatalytic oxidation of methyl orange by natural V-bearing rutile under visible light
Photocatalytic oxidation of methyl orange by natural V-bearing rutile under visible light
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DOI：
10.1016/j.solmat.2007.06.015
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发表时间：
2007-11
影响因子：
6.9
通讯作者：
Anhuai Lu;Yan Li;M. Lv;Changqiu Wang;Lei Yang;Juan Liu;Yonghua Wang;K. Wong;P. Wong
中科院分区：
文献类型：
--
作者：
Anhuai Lu;Yan Li;M. Lv;Changqiu Wang;Lei Yang;Juan Liu;Yonghua Wang;K. Wong;P. Wong
天然金红石取代金属离子V5+和Fe3+，在可见光下表现出良好的光催化活性。结果表明，可见光照射1h后，甲基橙的光降解率为60.59%。通过与P25型二氧化钛的对比，探讨了天然金红石对MO的降解效率和机理。可见光响应是由于取代离子改变了能带结构，有效光活性与过氧化氢和表面羟基的存在有关。此外，处于高氧化态的取代金属离子可以捕获光生电子，从而抑制电子-空穴结合。
Natural rutile, which contains substituting metal ions as V5+and Fe3+, was found to exhibit good photoactivity in visible light. The result showed that 60.59% of methyl orange (MO) was photodegraded after 1h visible light irradiation. Compared with P25 TiO2, the efficiency and mechanism of MO degradation by natural rutile was discussed. The visible light response was due to the substituting ions altering the band structure, and the effective photoactivity was related to the presence of H2O2and surface hydroxyl groups. Moreover, the substituting metal ions in their high oxidation states could capture photogenerated electrons to suppress electron–hole combination.