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Title: Synergetic effect of Ti 3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO 2/g-C 3N 4 heterojunctions

Abstract

To improve the utilization of visible light and reduce photogenerated electron/hole recombination, Ti 3+ self-doped TiO 2/oxygen-doped graphitic carbon nitride (Ti 3+-TiO 2/O-g-C 3N 4) heterojunctions were prepared via hydrothermal treatment of a mixture of g-C 3N 4 and titanium oxohydride sol obtained from the reaction of TiH 2 with H 2O 2. In this way, exfoliated O-g-C 3N 4 and Ti 3+-TiO 2 nanoparticles were obtained. Simultaneously, strong bonding was formed between Ti 3+-TiO 2 nanoparticles and exfoliated O-g-C 3N 4 during the hydrothermal process. Charge transfer and recombination processes were characterized by transient photocurrent responses, electrochemical impedance test, and photoluminescence spectroscopy. The photocatalytic performances were investigated through rhodamine B degradation test under an irradiation source based on 30 W cold visible-light-emitting diode. The highest visible-light photoelectrochemical and photocatalytic activities were observed from the heterojunction with 1:2 mass ratio of Ti 3+-TiO 2 to O-g-C 3N 4. The photodegradation reaction rate constant based on this heterojuction is 0.0356 min -1, which is 3.87 and 4.56 times higher than those of pristine Ti 3+-TiO 2 and pure g-C 3N 4, respectively. Here, the remarkably high photoelectrochemical and photocatalytic performances of the heterojunctions are mainly attributed to the synergetic effect ofmore » efficient photogenerated electron-hole separation, decreased electron transfer resistance from interfacial chemical hydroxy residue bonds, and oxidizing groups originating from Ti 3+-TiO 2 and O-g-C 3N 4.« less

Authors:
 [1];  [1];  [2];  [3];  [1]; ORCiD logo [2]
  1. Ludong Univ., Yantai (People's Republic of China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Shandong Univ., Jinan (People's Republic of China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1371557
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 13; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; Ti3+ self-doped TiO2; oxygen doped g-C3N4; heterojunctions; PEC; photocatalysis; cold LED light

Citation Formats

Li, Kai, Huang, Zhenyu, Zeng, Xiaoqiao, Huang, Baibiao, Gao, Shanmin, and Lu, Jun. Synergetic effect of Ti3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO2/g-C3N4 heterojunctions. United States: N. p., 2017. Web. doi:10.1021/acsami.6b16191.
Li, Kai, Huang, Zhenyu, Zeng, Xiaoqiao, Huang, Baibiao, Gao, Shanmin, & Lu, Jun. Synergetic effect of Ti3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO2/g-C3N4 heterojunctions. United States. doi:10.1021/acsami.6b16191.
Li, Kai, Huang, Zhenyu, Zeng, Xiaoqiao, Huang, Baibiao, Gao, Shanmin, and Lu, Jun. Tue . "Synergetic effect of Ti3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO2/g-C3N4 heterojunctions". United States. doi:10.1021/acsami.6b16191. https://www.osti.gov/servlets/purl/1371557.
@article{osti_1371557,
title = {Synergetic effect of Ti3+ and oxygen doping on enhancing photoelectrochemical and photocatalytic properties of TiO2/g-C3N4 heterojunctions},
author = {Li, Kai and Huang, Zhenyu and Zeng, Xiaoqiao and Huang, Baibiao and Gao, Shanmin and Lu, Jun},
abstractNote = {To improve the utilization of visible light and reduce photogenerated electron/hole recombination, Ti3+ self-doped TiO2/oxygen-doped graphitic carbon nitride (Ti3+-TiO2/O-g-C3N4) heterojunctions were prepared via hydrothermal treatment of a mixture of g-C3N4 and titanium oxohydride sol obtained from the reaction of TiH2 with H2O2. In this way, exfoliated O-g-C3N4 and Ti3+-TiO2 nanoparticles were obtained. Simultaneously, strong bonding was formed between Ti3+-TiO2 nanoparticles and exfoliated O-g-C3N4 during the hydrothermal process. Charge transfer and recombination processes were characterized by transient photocurrent responses, electrochemical impedance test, and photoluminescence spectroscopy. The photocatalytic performances were investigated through rhodamine B degradation test under an irradiation source based on 30 W cold visible-light-emitting diode. The highest visible-light photoelectrochemical and photocatalytic activities were observed from the heterojunction with 1:2 mass ratio of Ti3+-TiO2 to O-g-C3N4. The photodegradation reaction rate constant based on this heterojuction is 0.0356 min-1, which is 3.87 and 4.56 times higher than those of pristine Ti3+-TiO2 and pure g-C3N4, respectively. Here, the remarkably high photoelectrochemical and photocatalytic performances of the heterojunctions are mainly attributed to the synergetic effect of efficient photogenerated electron-hole separation, decreased electron transfer resistance from interfacial chemical hydroxy residue bonds, and oxidizing groups originating from Ti3+-TiO2 and O-g-C3N4.},
doi = {10.1021/acsami.6b16191},
journal = {ACS Applied Materials and Interfaces},
number = 13,
volume = 9,
place = {United States},
year = {Tue Mar 07 00:00:00 EST 2017},
month = {Tue Mar 07 00:00:00 EST 2017}
}

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Cited by: 9works
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  • A simple one-step calcination route was used to prepare Ti3+ self-doped TiO2/g-C3N4 heterojunctions by mixture of H2Ti3O7 and melamine. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR) spectroscopy, and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS) technologies were used to characterize the structure, crystallinity, morphology, and chemical state of the as-prepared samples. The absorption of the prepared Ti3+ self-doped TiO2/g-C3N4 heterojunctions shifted to a longer wavelength region in comparison with pristine TiO2 and g-C3N4. The photocatalytic activities of the heterojunctions were studied by degrading methylene blue under a 30more » W visible-light-emitting diode irradiation source. The visible-light photocatalytic activities enhanced by the prepared Ti3+ self-doped TiO2/g-C3N4 heterojunctions were observed and proved to be better than that of pure TiO2 and g-C3N4. The photocatalysis mechanism was investigated and discussed. The intensive separation efficiency of photogenerated electron-hole in the prepared heterojunction was confirmed by photoluminescence (PL) spectra. The removal rate constant reached 0.038 min(-1) for the 22.3 wt % Ti3+ self-doped TiO2/g-C3N4 heterojunction, which was 26.76 and 7.6 times higher than that of pure TiO2 and g-C3N4, respectively. The established heterojunction between the interfaces of TiO2 nanoparticles and g-C3N4 nanosheets as well as introduced Ti3+ led to the rapid electron transfer rate and improved photoinduced electron-hole pair's separation efficiency, resulting in the improved photocatalytic performance of the Ti3+ self-doped TiO2/g-C3N4 heterojunctions.« less
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