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Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO₂ in optically transparent aqueous dispersions.

ABSTRACT: In this study, the preparation of anatase TiO₂ nanocrystals via a facile non-aqueous sol-gel route and their characterization are reported. The 3-4 nm particles are readily dispersable in aqueous media and show excellent photoreactivity in terms of rhodamine B degradation. The catalytic performance can be further increased considerably by doping with iron and UV-light irradiation as a pre-treatment. The effect of surface ligands (blocked adsorption sites, surface defects etc.) on the photoreactivity was thoroughly probed using thermogravimetric analysis combined with mass spectrometry. Photoelectrochemical characterization of thin-film electrodes made from the same TiO₂ nanocrystals showed the opposite trend to the catalytic experiments, that is, a strong decrease in photocurrent and quantum efficiency upon doping due to introduction of shallow defect states.

SUBMITTER: Einert M

PROVIDER: S-EPMC8417263 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

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Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO<sub>2</sub> in optically transparent aqueous dispersions.

Einert Marcus M Hartmann Pascal P Smarsly Bernd B Brezesinski Torsten T

Scientific reports 20210903 1

In this study, the preparation of anatase TiO<sub>2</sub> nanocrystals via a facile non-aqueous sol-gel route and their characterization are reported. The 3-4 nm particles are readily dispersable in aqueous media and show excellent photoreactivity in terms of rhodamine B degradation. The catalytic performance can be further increased considerably by doping with iron and UV-light irradiation as a pre-treatment. The effect of surface ligands (blocked adsorption sites, surface defects etc.) on the ...[more]

PMID: 34480048

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Project description:Dyes in wastewater are a serious problem that needs to be resolved. Adsorption coupled photocatalysis is an innovative technique used to remove dyes from contaminated water. Novel composites of TiO2-Fe3C-Fe-Fe3O4 dispersed on graphitic carbon were fabricated using natural ilmenite sand as the source of iron and titanium, and sucrose as the carbon source, which were available at no cost. Synthesized composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and diffuse reflectance UV-visible spectroscopy (DRS). Arrangement of nanoribbons of graphitic carbon with respect to the nanomaterials was observed in TEM images, revealing the occurrence of catalytic graphitization. Variations in the intensity ratio (I D/I G), L a and L D, calculated from data obtained from Raman spectroscopy suggested that the level of graphitization increased with an increased loading of the catalysts. SEM images show the immobilization of nanoplate microballs and nanoparticles on the graphitic carbon matrix. The catalyst surface consists of Fe3+ and Ti4+ as the metal species, with V, Mn, and Zr being the main impurities. According to DRS spectra, the synthesized composites absorb light in the visible region efficiently. Fabricated composites effectively adsorb methylene blue via π-π interactions, with the absorption capacities ranging from 21.18 to 45.87 mg/g. They were effective in photodegrading methylene blue under sunlight, where the rate constants varied in the 0.003-0.007 min-1 range. Photogenerated electrons produced by photocatalysts captured by graphitic carbon produce O2 •- radicals, while holes generate OH• radicals, which effectively degrade methylene blue molecules. TiO2-Fe3C-Fe-Fe3O4/graphitic carbon composites inhibited the growth of Escherichia coli (69%) and Staphylococcus aureus (92%) under visible light. Synthesized novel composites using natural materials comprise an ecofriendly, cost-effective solution to remove dyes, and they were effective in inhibiting the growth of Gram-negative and Gram-positive bacteria.

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Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO₂ in optically transparent aqueous dispersions.

Publications

Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO<sub>2</sub> in optically transparent aqueous dispersions.

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Dataset Information

Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO2 in optically transparent aqueous dispersions.

Publications

Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO<sub>2</sub> in optically transparent aqueous dispersions.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO₂ in optically transparent aqueous dispersions.