Enhanced Photocatalytic Activity in Low-Temperature Processed Titania Mesoporous Films
Enhanced Photocatalytic Activity in Low-Temperature Processed Titania Mesoporous Films
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DOI：
10.1021/jp501653x
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发表时间：
2014-06-05
影响因子：
3.7
通讯作者：
Innocenzi, Plinio
中科院分区：
文献类型：
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作者：
Carboni, Davide;Marongiu, Daniela;Innocenzi, Plinio
光催化介孔二氧化钛薄膜的技术应用的可能性依赖于降低加工温度的能力，同时保持其功能特性。在这里，我们提出了一种介孔二氧化钛薄膜的合成，这使得使用部分氟化的表面活性剂Zonyl FS 300作为介孔结构剂。通过使用硬脂酸作为模型化合物，通过FTIR光谱作为膜的热退火的函数（范围从150至400摄氏度），跟踪光致降解活性。将结果与基准模板剂Pluronic F127进行了比较，并强调了在整个分析温度范围内，Zonyl模板化膜的活性一直较高，高达50%。拉曼光谱表明，Zonyl FS 300能够在低于Pluronic F127的温度下产生纳米尺寸的二氧化钛晶体。这解释了在低温下处理的相应介孔薄膜的不同光催化响应。
The possibility of extending the technological applications of photocatalytic mesoporous titania films relies upon the capability of lowering the processing temperature while maintaining its functional properties. Here we present a synthesis of mesoporous titania films, which makes use of a partially fluorinated surfactant Zonyl FS300 as a mesostructuring agent. The photoinduced degradation activity has been followed by FTIR spectroscopy as a function of the films' thermal annealing, ranging from 150 up to 400 degrees C, by using stearic acid as a model compound. The results have been compared with the benchmark templating agent Pluronic F127 and highlighted a constantly higher activity of the Zonyl-templated films, up to 50%, throughout the range of the temperatures analyzed. Raman spectroscopy indicates that Zonyl FS300 is capable of producing nanosized titania crystals at temperatures lower than Pluronic F127. This explains the different photocatalytic response of the corresponding mesoporous thin films processed at low temperatures.