The pivotal effect of the interaction between reactant and anatase TiO2 nanosheets with exposed {001} facets on photocatalysis for the photocatalytic purification of VOCs
The pivotal effect of the interaction between reactant and anatase TiO2 nanosheets with exposed {001} facets on photocatalysis for the photocatalytic purification of VOCs
复制标题
反应物与暴露{001}面的锐钛矿型TiO2纳米片之间的相互作用对光催化净化VOCs的关键影响
DOI：
10.1016/j.apcatb.2015.08.034
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发表时间：
2016
影响因子：
22.1
通讯作者：
Li Neng
中科院分区：
文献类型：
--
作者：
Ren Lu;Li Yuanzhi;Hou Jingtao;Bai Jilin;Mao Mingyang;Zeng Min;Zhao Xiujian;Li Neng
我们研究了反应物与{0，0，1}面暴露的无F或F修饰的锐钛矿型二氧化钛纳米片之间的相互作用对光催化性能的影响。首次发现，反应物与二氧化钛纳米片之间的强相互作用不仅逆转了无氟二氧化钛纳米片和氟改性二氧化钛纳米片的光催化活性，而且尽管锐钛矿型二氧化钛的带隙很大(3.2 eV)，可见光区没有吸收，但仍能显著地诱导出对丙酮、苯和甲苯等VOCs的高效可见光催化降解。氟修饰的二氧化钛纳米片与丙酮的相互作用比不含氟的二氧化钛纳米片更强，导致前者的光催化活性高于后者，并且前者对丙酮光降解具有可见的光催化活性。另一方面，无氟二氧化钛纳米片与苯或甲苯的相互作用比氟修饰的二氧化钛纳米片更强，导致前者的光催化活性高于后者，前者对苯或甲苯的光催化降解具有明显的催化活性。我们在密度泛函理论计算的基础上，通过光电流测量和荧光发射衰变的实验证据，对相互作用的新的和重要的影响提供了一个基本的见解。这种强相互作用既影响了TiO2光生载流子对反应物的分离效率，又影响了它们的带隙特性。
We study the effect of the interaction between reactants and F-free or F-modified anatase TiO2nanosheets with exposed {0 0 1} facets on photocatalysis. It is found for the first time that the strong interaction between the reactants and TiO2nanosheets not only reverses the photocatalytic activity of the F-free TiO2nanosheets and F-modified TiO2nanosheets, but also conspicuously induces efficient visible photocatalytic activity for the photodegradation of VOCs such as acetone, benzene, and toluene in spite of the large band gap of anatase TiO2(3.2 eV) and no absorption of the VOCs in visible region. F-modified TiO2nanosheets have more strong interaction with acetone than F-free TiO2nanosheets, resulting in the photocatalytic activity of the former higher than the later and the visible photocatalytic activity of the former for the acetone photodegradation. On the other hand, F-free TiO2nanosheets have more strong interaction with benzene or toluene than F-modified TiO2nanosheets, resulting in the photocatalytic activity of the former higher than the later and the visible photocatalytic activity of the former for the photodegradation of benzene or toluene. We provide a fundamental insight in the novel and important effect of the interaction on the basis of both DFT calculation and the experimental evidences by photocurrent measurement and fluorescence emission decay. The strong interaction affects both the separation efficiency of the photogenerated charge carriers from TiO2to the reactants and their band gap characteristics.