Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation

Bielan, Zuzanna; Dudziak, Szymon; Sulowska, Agnieszka; Pelczarski, Daniel; Ryl, Jacek; Zielińska‐Jurek, Anna

doi:10.3390/ma13122763

Cited by 18 publications

(3 citation statements)

References 73 publications

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“…As mentioned in the Introduction, contrary results on the defective/hydrogenated/self-doped titania have been published, showing both activity increase and decrease under UV irradiation. For example, Bielan et al observed a decrease in activity for phenol degradation [67], whereas Zywitzki et al reported an activity enhancement for hydrogen evolution [68]. It has been proposed that Ti 3+ species might also reduce protons to H 2 or platinum cations (Pt 2+ ) to form Pt nanoparticles (NPs).…”

Section: Resultsmentioning

confidence: 99%

Is Black Titania a Promising Photocatalyst?

et al. 2022

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Five different (commercial and self-synthesized) titania samples were mixed with NaBH4 and then heated to obtain black titania samples. The change in synthesis conditions resulted in the preparation of nine different photocatalysts, most of which were black in color. The photocatalysts were characterized by various methods, including X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), photoacoustic and reverse-double beam photoacoustic spectroscopy (PAS/RDB-PAS). The photocatalytic activity was tested for oxidative decomposition of acetic acid, methanol dehydrogenation, phenol degradation and bacteria inactivation (Escherichia coli) under different conditions, i.e., irradiation with UV, vis, and NIR, and in the dark. It was found that the properties of the obtained samples depended on the features of the original titania materials. A shift in XRD peaks was observed only in the case of the commercial titania samples, indicating self-doping, whereas faceted anatase samples (self-synthesized) showed high resistance towards bulk modification. Independent of the type and degree of modification, all modified samples exhibited much worse activity under UV irradiation than original titania photocatalysts both under aerobic and anaerobic conditions. It is proposed that the strong reduction conditions during the samples’ preparation resulted in the partial destruction of the titania surface, as evidenced by both microscopic observation and crystallographic data (an increase in amorphous content), and thus the formation of deep electron traps (bulk defects as oxygen vacancies) increasing the charge carriers’ recombination. Under vis irradiation, a slight increase in photocatalytic performance (phenol degradation) was obtained for only four samples, while two samples also exhibited slight activity under NIR. In the case of bacteria inactivation, some modified samples exhibited higher activity under both vis and NIR than respective pristine titania, which could be useful for disinfection, cancer treatment and other purposes. However, considering the overall performance of the black titania samples in this study, it is difficult to recommend them for broad environmental applications.

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Section: Resultsmentioning

confidence: 99%

Is Black Titania a Promising Photocatalyst?

et al. 2022

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“…Titanium dioxide is a kind of semiconductor material with three crystal forms of anatase, rutile and brookite. Titanium dioxide has the characteristics of stable chemical properties, non-toxic, strong light stability, high oxidation efficiency and environmental friendliness [4][5][6][7] . However, in the practical application of photocatalysis technology, different materials and different preparation methods have certain effects on their photocatalytic properties, such as their composition, morphology, structure and other physical properties, thus affecting their chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Study on properties of zinc ferrite, titanium dioxide and their composites

Yang

Huo

et al. 2023

E3S Web Conf.

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In this paper, the methods of sulfuric acid leaching and chemical coprecipitation were used to prepare products such as purified zinc ferrite, synthetic zinc ferrite, synthetic titanium dioxide and its complex with purified zinc ferrite. The morphology and microstructure of the above samples were characterized and analyzed by XRD and SEM. The results showed that the purified zinc ferrite contained a small amount of ZnO, SiO2, Al2O3 and PbSO4. Its particle size was the largest and the crystallinity was the best, but the surface was not smooth, the particle size distribution was not uniform and there was agglomeration phenomenon. The purchased zinc ferrite had high purity, the smallest particle size and the worst crystallinity. Its surface was smooth, particle size distribution was uniform, and it was loose and porous. The synthetic zinc ferrite had high purity, smooth surface, uniform particle size distribution and obvious agglomeration. The prepared titanium dioxide had no other impurities, good crystallinity, smooth surface and certain agglomeration phenomenon. For the zinc ferrite/titanium dioxide composite, adding a small amount of purified zinc ferrite would change the crystallinity of titanium dioxide, but it had little effect on the grain size of titanium dioxide. The surface was rough, the particle size distribution was not uniform, and there was agglomeration phenomenon.

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“…Thus far, many studies have been performed to investigate the stability of TiO 2 nanofluids with different concentrations and under various pH and ionic strength conditions [ 20 , 25 , 26 , 27 , 28 , 29 , 30 ]. The final objective of such research works is to define the best conditions for optimal performance of TiO 2 -based composites, whatever the field of application.…”

Section: Introductionmentioning

confidence: 99%

TiO2 Nanoparticles Dispersion in Block-Copolymer Aqueous Solutions: Nanoarchitectonics for Self-Assembly and Aggregation

Nibali

D’Angelo

Arena

et al. 2022

JFB

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Achieving homogenous dispersion of nanoparticles inside a polymeric matrix is a great challenge for numerous applications. In the present study, we aim at understanding the role of different factors on the dispersion properties of TiO2 in pluronic F-127 mixtures. The mixtures were prepared with different pH and guest/host ratios and investigated by UV-Vis spectroscopy, dynamic light scattering, infrared spectroscopy and electrical conductivity. Depending on the preparation conditions, different amounts of TiO2 were loaded within the copolymer as quantitatively determined by UV-Vis spectroscopy. The different content of nanoparticles has direct implications on the gelation and micellization of pluronic analyzed by dynamic light scattering. The information derived on the self-assembly behavior was interpreted in relation to the infrared and conductivity measurements results. Together, these results shed light on the most favorable conditions for improving the nanoparticle dispersion inside the copolymer matrix and suggest a possible strategy to design functional nanoparticle-polymer systems.

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Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation

Cited by 18 publications

References 73 publications

Is Black Titania a Promising Photocatalyst?

Is Black Titania a Promising Photocatalyst?

Study on properties of zinc ferrite, titanium dioxide and their composites

TiO2 Nanoparticles Dispersion in Block-Copolymer Aqueous Solutions: Nanoarchitectonics for Self-Assembly and Aggregation

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