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Enhanced active oxidative species generation over Fe-doped defective TiO₂ nanosheets for boosted photodegradation.

ABSTRACT: Semiconductor photocatalysis is widely proposed for decomposing multiple pollutants via photo-generated oxidative species. However, the photocatalytic degradation performance in practical settings still remains unsatisfactory due to the limited production of active oxidative species (AOS). In this work, a defect engineering strategy was developed to explore the superiority of oxygen vacancies (Vo) and their structural regulation to enhance AOS production for boosting photodegradation. Taking anatase TiO₂ as a model photocatalyst, ultrathin TiO₂ nanosheets containing abundant Vo and appropriate Fe doping exhibited an unprecedented 134 times higher activity in the degradation of Rhodamine B (RhB) (rate as high as 0.3073 min^-1) than bulk anatase and were superior to most reported photocatalysts. The defect-rich ultrathin TiO₂ nanosheets could be further applied in high-efficiency degradation of tetracycline hydrochloride (TC-HCl) with the degradation rate of 0.0423 min^-1. The in situ electron paramagnetic resonance, advanced spectroscopic characterization and electrochemical measurement revealed the key role of Vo and Fe doping in facilitating the production of photo-generated holes and superoxide radicals (˙O₂ ^-) that were identified to be effective to decompose both RhB and TC-HCl. This research provides insight into defect engineering promoting AOS generation and gives inspiration for the design of efficient photocatalysts for photooxidation applications.

SUBMITTER: Gao X

PROVIDER: S-EPMC9057696 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Enhanced active oxidative species generation over Fe-doped defective TiO<sub>2</sub> nanosheets for boosted photodegradation.

Gao Xintong X Zhang Shuai S Liu Jingchao J Xu Shiqi S Li Zenghe Z

RSC advances 20201109 67

Semiconductor photocatalysis is widely proposed for decomposing multiple pollutants <i>via</i> photo-generated oxidative species. However, the photocatalytic degradation performance in practical settings still remains unsatisfactory due to the limited production of active oxidative species (AOS). In this work, a defect engineering strategy was developed to explore the superiority of oxygen vacancies (Vo) and their structural regulation to enhance AOS production for boosting photodegradation. Tak ...[more]

PMID: 35519198

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Project description:Waste from the sugar cane industry and alcohol distilleries is one of the sources of water pollution, and the degradation of this effluent is a very challenging task. Photocatalytic degradation can be an attractive alternative to conventional degradation processes. A vanadium-doped TiO2 (V-TiO2) photocatalyst for the degradation of spent wash and industrial dyes has been studied and reported here. V-doped TiO2 nanoparticles were prepared using a sol-gel method based on aqueous titanium peroxide with titanium isopropoxide as the Ti precursor and V2O5 as the V precursor. In order to observe the effect of the dopant on sol-gel behaviour, physicochemical and structural properties, the concentration of V was varied between 1.0% and 5% by weight. The crystallization temperature and time were optimized to obtain the required phase of V-TiO2. The physicochemical and structural characteristics of the V-doped TiO2 catalyst were determined using Brunauer-Emmett-Teller (BET), X-ray diffraction, FESEM, TEM, TG, FT-IR, Raman, PL and UV-visible spectroscopic techniques. UV-visible analysis showed a red shift in the absorption edge of TiO2 upon doping with V metal, which suggested an increase in the absorption of visible light due to a decrease in the effective band gap. The application potential of the V-TiO2 catalyst was studied via the degradation of sugar industry waste (spent wash) and Jakofix red dye (HE 8BN) under natural sunlight, as well as a standard artificial solar energy source (Xe lamp). The highest activity was observed for a 1% V-TiO2 photocatalyst for the degradation of spent wash and Jakofix red dye under natural sunlight. The degradation of coloured compounds in spent wash was monitored by gel permeation chromatography (GPC), which showed the degradation of high-molecular-weight compounds into low-molecular-weight fractions. The catalyst decomposed 90% of Jakofix red dye (HE 8BN) in 3.5 h and 65% of spent wash in 5 h under irradiation with natural sunlight, whereas Degussa P-25 TiO2 was only able to decompose 35% of the dye and 20% of spent wash under identical reaction conditions. A cycling stability test showed the high stability and reusability of the photocatalyst for degradation reactions, with a recovery of around 94-96%.

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Enhanced active oxidative species generation over Fe-doped defective TiO₂ nanosheets for boosted photodegradation.

Publications

Enhanced active oxidative species generation over Fe-doped defective TiO<sub>2</sub> nanosheets for boosted photodegradation.

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Enhanced active oxidative species generation over Fe-doped defective TiO2 nanosheets for boosted photodegradation.

Publications

Enhanced active oxidative species generation over Fe-doped defective TiO<sub>2</sub> nanosheets for boosted photodegradation.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Enhanced active oxidative species generation over Fe-doped defective TiO₂ nanosheets for boosted photodegradation.