Dataset Information

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO₂: Surface-Structure Dependence and Silver-Deposition Effect.

ABSTRACT: Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO₂ catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol-gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the surfaces of these catalysts by using a facile photo-deposition technique. Their physical and chemical properties were evaluated by using scanning electron microscopy (SEM), transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDS), Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), and diffuse reflectance spectra (DRS). The photocatalytic performances of the synthesized catalysts were examined in coumarin and 1,4-hydroquinone solutions. The results showed that the hollow structure of NT-A played an important role in obtaining high specific surface area and appreciable photoactivity. In addition, Ag-loading on the surface of non-hollow structured NT-U could double the photocatalytic performance with an optimum Ag concentration of 10^-6 mol g^-1, while a slight but monotonous decrease was caused in this respect for the hollow surface of NTA upon increasing Ag concentration. Comparing the catalysts with different structures regarding the photocatalytic performance, silverized non-hollow NT-U proved competitive with the hollow NT-A catalyst without Ag-loading for efficient visible-light-driven photocatalytic oxidative degradations. The former one, due to the silver nanoparticles on the catalyst surface, displayed an appreciable antibacterial activity, which was comparable to that of a reference material practically applied for disinfection in polymer coatings.

SUBMITTER: Wafi A

PROVIDER: S-EPMC7697533 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO<sub>2</sub>: Surface-Structure Dependence and Silver-Deposition Effect.

Wafi Abdul A Szabó-Bárdos Erzsébet E Horváth Ottó O Pósfai Mihály M Makó Éva É Juzsakova Tatjána T Fónagy Orsolya O

Nanomaterials (Basel, Switzerland) 20201115 11

Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO<sub>2</sub> catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol-gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the ...[more]

PMID: 33203178

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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

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO₂: Surface-Structure Dependence and Silver-Deposition Effect.

Publications

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO<sub>2</sub>: Surface-Structure Dependence and Silver-Deposition Effect.

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Dataset Information

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect.

Publications

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO<sub>2</sub>: Surface-Structure Dependence and Silver-Deposition Effect.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO₂: Surface-Structure Dependence and Silver-Deposition Effect.