CNTs threaded (001) exposed TiO2 with high activity in photocatalytic NO oxidation

Shuning Xiao; Wei Zhu; Peijue Liu; Fanfan Liu; Wenrui Dai; Dieqing Zhang; Wei Chen; Hexing Li

doi:10.1039/C5NR07589K

CNTs threaded (001) exposed TiO₂ with high activity in photocatalytic NO oxidation†

Shuning Xiao,^ab Wei Zhu,^a Peijue Liu,^a Fanfan Liu,^a Wenrui Dai,^a Dieqing Zhang,*^a Wei Chen*^b and Hexing Li*^a

* Corresponding authors

^a Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, International Joint Lab on Resource Chemistry SHNU-NUS-PU, Department of Chemistry, Shanghai Normal University, Shanghai 200234, China

^b Department of Chemistry and Department of Physics, National University of Singapore, 3 Science Drive 3, 117543, Singapore
E-mail: dqzhang@shnu.edu.cn, phycw@nus.edu.sg, Hexing-li@shnu.edu.cn

Abstract

A microwave-ionothermal strategy was developed for in situ synthesis of CNTs threaded TiO₂ single crystal with a tunable percentage of surface exposed (001) active facets. The CNTs were used as microwave antennas to create local “super hot” dots to induce Ti³⁺ adsorption and hydrolysis, thereby leading to a good assembly of (001) facets exposed single crystalline TiO₂ threaded by the CNTs in the presence of Hmim[BF₄] ionic liquid. Due to the high percentage of the active (001) facets of single crystal TiO₂ and the direct electron transfer property of the CNTs, the as-prepared CNTs–TiO₂ composite showed a photocatalytic NO removal ratio of up to 76.8% under UV irradiation. In addition, with self-doped Ti³⁺, the CNTs–TiO₂ composite also exhibited an enhanced activity under irradiation with either solar lights or visible lights, showing good potential in practical applications for environmental remediation.

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Article information

DOI: https://doi.org/10.1039/C5NR07589K
Article type: Paper
Submitted: 30 Oct 2015
Accepted: 24 Dec 2015
First published: 25 Dec 2015

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Nanoscale, 2016,8, 2899-2907

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CNTs threaded (001) exposed TiO₂ with high activity in photocatalytic NO oxidation

S. Xiao, W. Zhu, P. Liu, F. Liu, W. Dai, D. Zhang, W. Chen and H. Li, Nanoscale, 2016, 8, 2899 DOI: 10.1039/C5NR07589K

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