Synthesis and Visible-light-driven Photocatalytic Activity of CsTi2NbO7@N-doped TiO2 Hybrid Core-shell Structure

doi:10.11901/1005.3093.2020.382

Chinese Journal of Materials Research

2021, Vol. 35

Issue (3): 221-230 DOI: 10.11901/1005.3093.2020.382

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Synthesis and Visible-light-driven Photocatalytic Activity of CsTi₂NbO₇@N-doped TiO₂ Hybrid Core-shell Structure

CHENG Ting¹^,², DONG Pengyu²(

), GAO Xin¹^,², MENG Chengqi³, WANG Yan³, CHEN Xiaowei³, ZHANG Beibei³, XI Xinguo³(

)

^1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
^2.School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
^3.School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China

Cite this article:

CHENG Ting, DONG Pengyu, GAO Xin, MENG Chengqi, WANG Yan, CHEN Xiaowei, ZHANG Beibei, XI Xinguo. Synthesis and Visible-light-driven Photocatalytic Activity of CsTi₂NbO₇@N-doped TiO₂ Hybrid Core-shell Structure. Chinese Journal of Materials Research, 2021, 35(3): 221-230.

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Abstract

A novel CsTi₂NbO₇@N-TiO₂ core-shell hybrid material was successfully prepared by mixing CsTi₂NbO₇ with titanium isopropoxide and then calcining with urea in atmosphere. The prepared products were characterized by means of X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet–visible diffuse reflectance absorption spectrum (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). It was found that the N doping resulted in the shortening of the band gap of TiO₂ and the red-shift of absorption edge, thus achieving the visible light response. Because of the synergistic effect of hybridization, core-shell structure, and N doping, the as-prepared CsTi₂NbO₇@N-TiO₂ hybrid core-shell structural materials not only have strong visible absorption properties, but also exhibit enhanced photocatalytic activity for degradation of methylene blue (MB) under visible light irradiation, resulting from the improvement of carrier separation and migration efficiency due to the existence of the built-in electric field. Moreover, the reaction rate constant of CsTi₂NbO₇@N-TiO₂ hybrid core-shell structural material is about 5.8 times that of CsTi₂NbO₇. Therefore, it shows good photocatalytic cycle stability.

Key words: inorganic non-metallic materials core-shell structure nitrogen doping titanium dioxide Visible-light photo-degradation

Received: 09 September 2020

ZTFLH:

O643

Fund: National Natural Science Foundation of China(51772258);Research and Development Project of China(2016YFC0209202);Ministry of Housing and Urban Rural Development Science and Technology Project(2018-K1-004);Postgraduate Research & Practice Innovation Program of Jiangsu Province(SJCX19_1037 & KYCX20_2965)

About author: DONG Pengyu, Tel: 18351484051, E-mail: dongpy11@gmail.com
XI Xinguo, Tel: 13770020178, E-mail: xi_xinguo@ycit.edu.cn

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	Ting CHENG
	Pengyu DONG
	Xin GAO
	Chengqi MENG
	Yan WANG
	Xiaowei CHEN
	Beibei ZHANG
	Xinguo XI

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.382 OR https://www.cjmr.org/EN/Y2021/V35/I3/221

Fig.1 Crystal structure of CsTi₂NbO₇

Fig.2 Design philosophy of CsTi₂NbO₇@N-TiO₂core-shell structure

Fig.3 XRD patterns of as-prepared samples CsTi₂NbO₇, TiO₂, TNT and TNNT

Fig.4 SEM micrographs ofCsTi₂NbO₇ (a) and TNNT (b)

Fig.5 TEM images (a, d) and enlarged HRTEM images (b, c) of TNNT

Fig.6 XPS spectra of TNNT sample (a) full spectrum, (b) high resolution N 1s spectrum, (c) high resolution Ti 2p spectrum and (d) high resolution O 1s spectrum

Fig.7 UV-Visible diffuse reflectance spectra of different samples (a) CsTi₂NbO₇, TiO₂, N-TiO₂, TNT_{and TNNT, (b) TNNT-x series samples with different mass ratios (x=3、5、7、9 and 11)}

Fig.8 Photocurrent responses of CsTi₂NbO₇, TNT and TNNT samples

Fig.9 Visible-light photocatalytic degradation ratios (a) and photocatalytic reaction rate constants (b) of MB solution over different sample

Fig.10 UV-visible absorption spectra of MB solutions (the inset shows the color changes of MB solution vs. irradiation time) (a), andcycling runs (b) of photodegradation of MB solutions over TNNT under visible light irradiation

Fig.11 Proposed mechanism of photocatalytic degradation of MB over the TNNT under visible light irradiation

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