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Structural, optical and photocatalytic properties of erbium (Er³⁺) and yttrium (Y³⁺) doped TiO₂ thin films with remarkable self-cleaning super-hydrophilic properties.

ABSTRACT: The self-cleaning and super hydrophilic properties of pristine TiO₂ and of TiO₂ doped with Er³⁺ or Y³⁺ transparent thin films deposited onto glass substrates were investigated. The thin films prepared by multiple dipping and drying cycles of the glass substrate into the pristine TiO₂ sol and Er³⁺ or Y³⁺-doped TiO₂ sol were characterized by X-ray diffraction, UV-vis spectrophotometry, and atomic force microscopy (AFM). The self-cleaning photocatalytic activity of the thin films towards the removal of oleic acid deposited on the surface under UVA irradiation was evaluated. A remarkable enhancement was observed in the hydrophilic nature of the TiO₂ thin films under irradiation. The optical properties and wettability of TiO₂ were not affected by Er³⁺ or Y³⁺ doping. However, the photocatalytic degradation of oleic acid under UVA irradiation improved up to 1.83 or 1.95 fold as the Er³⁺ or Y³⁺ content increased, respectively, due to the enhanced separation of the photogenerated carriers and reduced crystallite size. AFM analysis showed that the surface roughness increased by increasing the Er³⁺ or Y³⁺ content due to the formation of large aggregates. This in turn contributes to the increase of the active surface area enhancing the photodegradation process. This study demonstrates that TiO₂ doped with low amounts of Er³⁺ or Y³⁺ down to 0.5 mol% can produce transparent, super-hydrophilic, thin film surfaces with remarkable self-cleaning properties.

SUBMITTER: da Silva Cardoso R

PROVIDER: S-EPMC9053396 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Structural, optical and photocatalytic properties of erbium (Er3+) and yttrium (Y3+) doped TiO2 thin films with remarkable self-cleaning super-hydrophilic properties.

da Silva Cardoso Raquel R Maria de Amorim Suélen S Scaratti Gidiane G Moura-Nickel Camilla Daniela CD Muniz Moreira Rodrigo Peralta RP Li Puma Gianluca G Moreira Regina de Fatima Peralta Muniz RFPM

RSC advances 20200401 29

The self-cleaning and super hydrophilic properties of pristine TiO2 and of TiO2 doped with Er3+ or Y3+ transparent thin films deposited onto glass substrates were investigated. The thin films prepared by multiple dipping and drying cycles of the glass substrate into the pristine TiO2 sol and Er3+ or Y3+-doped TiO2 sol were characterized by X-ray diffraction, UV-vis spectrophotometry, and atomic force microsco ...[more]

PMID: 35521462

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Project description:Flexible fiber membranes for pollutant removal have received increasing attention due to their high adsorption performance and easy recycling characteristics. However, due to the lack of environmentally friendly regeneration, some adsorption membranes have low regeneration efficiency, especially in terms of chemical adsorption, so they lack reusability. This study prepares a series of conducting polymer [PAn (polyaniline) or PPy (polypyrrole) or PTh (polythiophene)] graphene quantum dots (GQDs, the size of GQDs is about 20 nm)/TiO2 ternary fiber membranes via a facile electrospinning method with chemical deposition. Remarkably, this creates an anatase TiO2 and π-conjugated system. The combination is beneficial to the photocatalytic degradation of organic pollutants, showing synergistic promotion in both the degradation rate and the degree of decomposition. The UV-vis test shows that the combination of GQDs broadens the optical response threshold of TiO2, from near ultraviolet region excitation to visible region excitation. At the same time, the conductive polymer load further reduces the energy required for photogenerated electron transfer, which theoretically improves the degradation effect. Photocatalytic degradation tests showed that the PTh/GQDs/TiO2 fiber membrane exhibited significant high photocatalytic activity of visible-light in the methylene blue (MB) and TC degradation. The degradation rate level is 92.90% and 80.58%, respectively and the MB removal is more than 4 times that of bare TiO2 membrane. After photocatalytic regeneration four times, the regeneration efficiency can be maintained above 95%. Notably, various experimental results show that the interface charge transfer mechanism between GQDs/TiO2 and PTh follows the Z-scheme heterojunction, which maximizes the retention of strong reducing electrons and oxidation holes. In the degradation, the active species of ·O2 - and ·OH, make different contributions in the photocatalysts, which oxidize and break down the pollutant molecules into small molecules and then to harmless substances. According to the electronegativity difference of the material itself, PTh acts as electron acceptor in the degradation system, and TiO2 fiber membrane doped with GQDs acts as electron donor. The present research, not only offers feasibility of the PTh/GQDs/TiO2 flexible fiber membrane as an environment-friendly catalyst, but also motivates researchers to develop flexible fiber materials for future photocatalytic technology.

Dataset Information

Structural, optical and photocatalytic properties of erbium (Er³⁺) and yttrium (Y³⁺) doped TiO₂ thin films with remarkable self-cleaning super-hydrophilic properties.

Publications

Structural, optical and photocatalytic properties of erbium (Er<sup>3+</sup>) and yttrium (Y<sup>3+</sup>) doped TiO<sub>2</sub> thin films with remarkable self-cleaning super-hydrophilic properties.

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