Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (8): 1373-1383.DOI: 10.1016/S1872-2067(18)63106-7

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One-pot topotactic synthesis of Ti3+ self-doped 3D TiO2 hollow nanoboxes with enhanced visible light response

Chengjiang Zhanga, Lijun Tiana, Lianqin Chena, Xiaofang Lib, Kangle Lva, Kejian Denga   

  1. a Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
    b College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • Received:2017-12-11 Revised:2018-05-13 Online:2018-08-18 Published:2018-07-04
  • Contact: 10.1016/S1872-2067(18)63106-7
  • Supported by:

    The work was supported by the National Natural Science Foundation of China (20702064, 21177161, 31402137), Hubei Province Science Fund for Distinguished Yong Scholars (2013CFA034) and the Program for Excellent Talents in Hubei Province (RCJH15001), the Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education (LYZ1107), and the Fundamental Research Funds for the Central University, South-Central University for Nationalities (CZP17077).

Abstract:

Ti3+ self-doped anatase three-dimensional (3D) TiO2 hollow nanoboxes were synthesized via a topological transformation process involving template participation by a facile one-pot hydrothermal treatment with an ethanol solution of zinc powder and TiOF2. It is worth noting that the 3D TiO2 hollow nanoboxes are assembled from six single-crystal nanosheets and have dominant exposure of the {001} facets. It is found from EPR spectra that adding zinc powder is an environment-friendly and effective strategy to introduce Ti3+ and oxygen vacancy (Ov) into the bulk of 3D hollow nanoboxes rather than the surface, which is responsible for their enhanced visible photocatalytic properties. The photocatalytic activity was evaluated by measuring the formation rate of hydroxide free radicals using 7-hydroxycoumarin as a probe. The sample prepared with zinc/TiOF2 mass ratio of 0.25 exhibited the highest RhB photodegradation activity under visible-light irradiation with a degradation rate of 96%, which is 4.0-times higher than that of pure TiO2. The results suggest a novel approach to construct in-situ 3D hierarchical TiO2 hollow nanoboxes doped with Ti3+ and Ov without introducing any impurity elements for superior visible-light photocatalytic activity.

Key words: Ti3+ self-doped, Topological transformation, Three-dimensional hollow nanoboxes, Visible light response, Photocatalytic activity