Selective oxidation of aldehydes on TiO2 photocatalysts modified with functional groups
Selective oxidation of aldehydes on TiO2 photocatalysts modified with functional groups
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DOI：
10.1016/j.molcata.2005.09.019
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发表时间：
2006-02
影响因子：
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通讯作者：
T. Ohno;Toshiki Tsubota;Kosuke Kakiuchi;Shinichi Miyayama;K. Sayama
中科院分区：
文献类型：
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作者：
T. Ohno;Toshiki Tsubota;Kosuke Kakiuchi;Shinichi Miyayama;K. Sayama
SiO2覆盖的二氧化钛（TiO 2）光催化剂（SiO2-TiO 2）的表面改性与烷基甲硅烷基基团，如烃，氟碳化合物，和苯基。结果表明，与未改性的SiO2-TiO 2光催化剂相比，改性后的SiO2-TiO 2光催化剂对丙醛、己醛、壬醛、五氟苯甲醛和苯甲醛的催化氧化效率明显提高.对于烃链修饰的SiO2-TiO 2光催化剂，表面改性后的TiO 2光催化剂光催化活性提高的一个重要因素是SiO2-TiO 2光催化剂上引入的烷基硅基团与基质之间的疏水相互作用。苯基修饰的SiO2-TiO 2光催化氧化苯甲醛的活性高于SiO2-TiO 2-C6。此外，五氟苯甲醛在SiO2-TiO 2-C8（F）链上的氧化比在SiO2-TiO 2-C8链上更有利。这些结果表明，在SiO2-TiO 2表面引入的官能团在光催化氧化有机物的选择性方面起着重要作用。
Surfaces of SiO2-covered titanium dioxide (TiO2) photocatalysts (SiO2-TiO2) were modified with alkylsilyl groups such as hydrocarbon, fluorocarbon, and phenyl groups. Oxidation of propanal, hexanal, nonanal, pentafuluorobenzaldehyde, and benzaldehyde proceeded much more efficiently on the surface-modified SiO2-TiO2particles than on SiO2-TiO2photocatalysts without surface modification. In the case of SiO2-TiO2photocatalysts modified with hydrocarbon chains, one of the most important factors for improvement of the photocatalytic activities of surface-modified TiO2photocatalysts is the hydrophobic interaction between substrates and alkylsilyl groups introduced onto SiO2-TiO2photocatalysts. SiO2-TiO2modified with phenyl groups is more active in the photocatalytic oxidation of benzaldehyde than SiO2-TiO2-C6. Furthermore, oxidation of pentafluorobenzaldehyde proceeded more favorably on SiO2-TiO2-C8(F) chains than on SiO2-TiO2-C8. These results indicated that the functional groups introduced onto the surface of SiO2-TiO2play an important role in showing selectivity for photocatalytic oxidation of organic compounds.