TiO2 activation by using activated carbon as a support -: Part II.: Photoreactivity and FTIR study
TiO2 activation by using activated carbon as a support -: Part II.: Photoreactivity and FTIR study
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DOI：
10.1016/s0926-3373(03)00075-4
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发表时间：
2003-08-20
影响因子：
22.1
通讯作者：
Navío, JA
中科院分区：
文献类型：
--
作者：
Araña, J;Doña-Rodríguez, JM;Navío, JA
研究表明，活性炭（AC）的存在对TiO2酸碱性质的修饰极大地改变了某些分子与催化剂表面的相互作用，从而改变了其光催化特性。红外光谱研究表明，当苯酚与TiO2相互作用生成苯氧化合物时，在低交流催化剂混合物中，表面羟基以与-OH基团对称的位置插入芳环中。此外，4-氨基苯酚研究表明，分子通过氨基与TiO2表面相互作用，而在含有AC的催化剂中，分子通过羟基与TiO2表面相互作用。这些结果证实了已经进行的表征研究确定的催化剂酸碱性质的变化。此外，研究还发现，AC含量最低的催化剂比未处理的TiO2和AC负载较高的催化剂表现出更好的催化性能。另一个有趣的结果是这些催化剂在太阳照射下的效率。(C) 2003 Elsevier Science B.V.版权所有
It has been demonstrated that the modification of the TiO2 acid-base properties by the presence of activated carbon (AC) considerably modify the interaction of some molecules with the catalyst surface and hence its photocatalytic characteristics.FTIR studies have shown that while phenol interacts with TiO2 yielding a phenoxide, in the catalyst low AC containing catalysts mixtures the surfacial hydroxylic groups are inserted in the aromatic ring in the symmetric position to the -OH group. Additionally, the 4-aminophenol study shows that the molecule interacts with the TiO2 surface by means of the amino group, while in the catalyst containing AC the interaction takes place through the hydroxylic group. These results have confirmed the catalyst acid-base properties changes determined by the characterisation studies already performed. Also, it has been observed that catalysts with the lowest AC content show better catalytic behaviour than the untreated TiO2 and those with higher AC load. Another interesting result is the efficiency of these catalysts under solar irradiation. (C) 2003 Elsevier Science B.V. All rights reserved.