Dataset Information

TiO₂ Nanowires with Doped g-C₃N₄ Nanoparticles for Enhanced H₂ Production and Photodegradation of Pollutants.

ABSTRACT: With the rapid consumption of fossil fuels, along with the ever-increasing environmental pollution, it is becoming a top priority to explore efficient photocatalysts for the production of renewable hydrogen and degradation of pollutants. Here, we fabricated a composite of g-C₃N₄/TiO₂ via an in situ growth method under the conditions of high-temperature calcination. In this method, TiO₂ nanowires with a large specific surface area could provide enough space for loading more g-C₃N₄ nanoparticles to obtain C₃N₄/TiO₂ composites. Of note, the g-C₃N₄/TiO₂ composite could effectively photocatalyze both the degradation of several pollutants and production of hydrogen, both of which are essential for environmental governance. Combining multiple characterizations and experiments, we found that the heterojunction constructed by the TiO₂ and g-C₃N₄ could increase the photocatalytic ability of materials by prompting the separation of photogenerated carriers. Furthermore, the photocatalytic mechanism of the g-C₃N₄/TiO₂ composite was also clarified in detail.

SUBMITTER: Jiang L

PROVIDER: S-EPMC7835803 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Publications

TiO2 Nanowires with Doped g-C3N4 Nanoparticles for Enhanced H2 Production and Photodegradation of Pollutants.

Jiang Liushan L Zeng Fanshan F Zhong Rong R Xie Yu Y Wang Jianli J Ye Hao H Ling Yun Y Guo Ruobin R Zhao Jinsheng J Li Shiqian S Hu Yuying Y

Nanomaterials (Basel, Switzerland) 20210119 1

With the rapid consumption of fossil fuels, along with the ever-increasing environmental pollution, it is becoming a top priority to explore efficient photocatalysts for the production of renewable hydrogen and degradation of pollutants. Here, we fabricated a composite of g-C3N4/TiO2 via an in situ growth method under the conditions of high-temperature calcination. In this method, TiO2 nanowires with a large specific surface area could provide enough s ...[more]

PMID: 33478044

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Project description:Background purposePhotocatalytic water splitting for hydrogen evolution is a potential way to solve many energy and environmental issues. Developing visible-light-active photocatalysts to efficiently utilize sunlight and finding proper ways to improve photocatalytic activity for H2 evolution have always been hot topics for research. This study attempts to expand the use of sunlight and to enhance the photocatalytic activity of TiO2 by N doping and Au loading.MethodsAu/N-doped TiO2 photocatalysts were synthesized and successfully used for photocatalytic water splitting for H2 evolution under irradiation of UV and UV-vis light, respectively. The samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and photoelectrochemical characterizations.ResultsDRS displayed an extension of light absorption into the visible region by doping of N and depositing with Au, respectively. PL analysis indicated electron-hole recombination due to N doping and an efficient inhibition of electron-hole recombination due to the loaded Au particles. Under the irradiation of UV light, the photocatalytic hydrogen production rate of the as-synthesized samples followed the order Au/TiO2 > Au/N-doped TiO2 > TiO2 > N-doped TiO2. While under irradiation of UV-vis light, the N-TiO2 and Au/N-TiO2 samples show higher H2 evolution than their corresponding nitrogen-free samples (TiO2 and Au/TiO2). This inconsistent result could be attributed to the doping of N and the surface plasmonic resonance (SPR) effect of Au particles extending the visible light absorption. The photoelectrochemical characterizations further indicated the enhancement of the visible light response of Au/N-doped TiO2.ConclusionComparative studies have shown that a combination of nitrogen doping and Au loading enhanced the visible light response of TiO2 and increased the utilization of solar energy, greatly boosting the photocatalytic activity for hydrogen production under UV-vis light.

Dataset Information

TiO₂ Nanowires with Doped g-C₃N₄ Nanoparticles for Enhanced H₂ Production and Photodegradation of Pollutants.

Publications

TiO<sub>2</sub> Nanowires with Doped g-C<sub>3</sub>N<sub>4</sub> Nanoparticles for Enhanced H<sub>2</sub> Production and Photodegradation of Pollutants.

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