Carbon Nitride Polymer Sensitization and Nitrogen Doping of SrTiO3/TiO2 Nanotube Heterostructure toward High Visible Light Photocatalytic Performance

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Fine Chemical Research Institute, School of Chemical Engineering and Technology, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China
*Z.R.: e-mail, [email protected]
*H.J.: e-mail, [email protected]
Cite this: Ind. Eng. Chem. Res. 2017, 56, 36, 9999–10008
Publication Date (Web):August 15, 2017
https://doi.org/10.1021/acs.iecr.7b02671
Copyright © 2017 American Chemical Society
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Abstract

Construction of versatile multijunctions with visible light response, effective charges transport and separation, suitable band positions, and good stability is highly expected for the photocatalytic VOCs degradation. Herein, one-dimensional titania nanotube supported SrTiO3 heterostructure (STO/TN) was developed by a hydrothermal process and then simultaneously sensitized with carbon nitride polymer (CN) and doped with nitrogen (CN-STO/TN) for photocatalytic mineralization of toluene. CN-STO/TN simultaneously exhibits the following advantages: (1) the nanotube structure enhances light-harvesting, enables effective charges transport and separation, retains sufficient energy of the charges, facilitates the pollutant species transport and reactants enrichment by the confinement effect; (2) synergistic effect of CN sensitization and N-doping extends the light response to the visible light region; (3) multichannel charges separation and transport among the multijunctions promote the photogenerated carriers separation. These beneficial factors lead to the remarkably higher visible light photocatalytic performance of CN-STO/TN in comparison with the component photocatalysts, 27 times that of TN, 13.5 times that of STO, and 4.9 times that of CN, respectively. These results demonstrate that the combination of morphology tailoring and energy band alignment manipulation is important in designing effective heterojunctions for photocatalytic applications.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.iecr.7b02671.

  • (HR)TEM, XPS data, DRS, PL, BET surface area, reaction rate constants; band gap, valence band, and conduction band values of the samples; toluene adsorption curves; toluene decomposition curves over STO/TN and CN-STO/TN under UV (or visible) light irradiation or in the dark (PDF)

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