Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures

Dudziak, Szymon; Kowalkińska, Marta; Karczewski, Jakub; Pisarek, Marcin; Siuzdak, Katarzyna; Kubiak, Adam; Siwińska-Ciesielczyk, Katarzyna; Zielińska‐Jurek, Anna

doi:10.1016/j.apsusc.2021.150360

Cited by 28 publications

(18 citation statements)

References 74 publications

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“…In the case of photoreaction with alkali earth scheelite-type compounds, by HPLC analysis, catechol (CT) and hydroquinone (HQ) were detected as the main intermediate products during the phenol photodegradation reaction. The production of CT and HQ during the reaction is typical for many photocatalysts. ,, Some works also suggest the formation of benzoquinone (BQ) being in possible equilibrium with hydroquinone. , However, in this study, BQ presence and the slowdown of the photocatalytic process were not observed. The evolution of phenol removal with the monitored formation of catechol and hydroquinone concentration as a function of photoreaction time using different photocatalysts is presented in Figure S6 in the Supporting Information.…”

Section: Resultscontrasting

confidence: 52%

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Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

et al. 2021

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In the present study, alkaline earth metal scheelite-type ABO4 compounds (A = Ca, Sr, and Ba; B = Mo and W) synthesized by a hydrothermal method were systematically studied. The as-obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, UV–vis diffuse reflectance (DR/UV–vis) spectroscopy, photoluminescence, and thermoluminescence (TL) spectroscopy together with charge carrier lifetime measurements, electron paramagnetic resonance (EPR) spectroscopy, and electrochemical impedance spectroscopy (EIS). The photocatalytic activity was studied in the reaction of phenol degradation under simulated solar light. The obtained tungstates and molybdates revealed excellent photocatalytic activity despite the low surface area and wide bandgap typical for insulators. The mechanism of phenol degradation proceeded through hydroquinone and catechol formation in the presence of hydroxyl and superoxide radicals. The presence of electron traps allowed absorption of light with lower energy than resulting from the absorption edge. BaWO4 and SrWO4, with the most extended average carrier lifetime, were the most efficient photocatalysts from the obtained series. In general, molybdates exhibited lower photocatalytic activity toward phenol degradation due to deeper trap states and lower average charge carrier lifetimes than tungstates. Additionally, electrochemical studies demonstrated that molybdates exhibit more insulating behavior than tungstates. The overall results showed that wide-bandgap semiconductors, mainly tungstates, can be applied as earth-abundant photocatalytic materials for the degradation of persistent organic pollutants.

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Section: Resultscontrasting

confidence: 52%

“…The production of CT and HQ during the reaction is typical for many photocatalysts. 30,68,76 Some works also suggest the formation of benzoquinone (BQ) being in possible equilibrium with hydroquinone. 77,78 However, in this study, BQ presence and the slowdown of the photocatalytic process were not observed.…”

Section: Fabrication Of Metalmentioning

confidence: 99%

Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

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“…The same relation was also observed previously for the series of different {0 0 1} exposed anatase nanosheets. 42 Ultimately, Figure 7 presents the detailed results of the phenol degradation and formation of its aromatic byproducts, including ortho and para-hydroxylated species. As observed, the amount of degraded phenol strictly correlates with the amount of the oxidized species, proving that the observed kinetics of phenol removal represents its chemical transformation rather than a photo-stimulated adsorption.…”

Section: Photocatalytic Degradation In Water and Gas Phasesmentioning

confidence: 99%

Surface and Trapping Energies as Predictors for the Photocatalytic Degradation of Aromatic Organic Pollutants

et al. 2022

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In this study, anatase samples enclosed by the majority of three different crystal facets {0 0 1}, {1 0 0}, and {1 0 1} were successfully synthesized. These materials were further studied toward photocatalytic degradation of phenol and toluene as model organic pollutants in water and gas phases. The obtained results were analyzed concerning their surface structure, reaction type, and surface development. Moreover, the regression model was created to find the correlation between the possible predictors and the photodegradation rate constants (k). From the studied factors, the trapping energy of charge carriers at the surface was found to be the most significant one, exponentially affecting the observed k. This resulted in the overall persurface activity between the samples being in the order {1 0 1} > {1 0 0} > {0 0 1}. Further introduction of the surface energy (E surf ) to the regression model and the number of possible trapping centers per number of pollutant's molecules (n trap •n −1 ) improved the model accuracy, simultaneously showing the dependence on the reaction type. In the case of phenol photocatalytic degradation, the best accuracy was observed for the model including E surf •(n trap •n −1 ) 1/2 relation, while for the toluene degradation, it included E surf 2 and the S•n −1 ratio, where S is the simple surface area. Concerning different surface features which influence photocatalytic performance and are commonly discussed in the literature, the results presented in this study suggest that trapping is of particular importance.

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“…[4]. In order to be able to control the above parameters, it is necessary not only to apply innovative synthesis techniques (e.g., microwave route [110]) but also to use morphology-determining agents (e.g., hydrofluoric acid [111]). Despite the undoubted advantages resulting from the high photoactivity of titania, researchers are still looking for novel materials with similar or better parameters than TiO 2 .…”

Section: Other Magnetic-photocatalytic Compositesmentioning

confidence: 99%

“…Since water purification from organic pollutants remains the most investigated application of the magnetic photocatalysts, these details, as well as the possible factors that affect them, are considered as crucial for further studies to better understand the interactions between hexaferrites, other photocatalysts, and pollutants. Moreover, the surface structure of the magnetic materials is usually not considered, though many reports on other photocatalysts have proven how important it is for efficient photocatalytic performance [111,144]. In this regard, surface-based studies of such materials are highly recommended as another direction for further research.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

et al. 2021

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Semiconducting materials display unique features that enable their use in a variety of applications, including self-cleaning surfaces, water purification systems, hydrogen generation, solar energy conversion, etc. However, one of the major issues is separation of the used materials from the process suspension. Therefore, chemical compounds with magnetic properties have been proposed as crucial components of photocatalytic composites, facilitating separation and recovery of photocatalysts under magnetic field conditions. This review paper presents the current state of knowledge on the application of spinel and hexagonal ferrites in heterogeneous photocatalysis. The first part focuses on the characterization of magnetic (nano)particles. The next section presents the literature findings on the single-phase magnetic photocatalyst. Finally, the current state of scientific knowledge on the wide variety of magnetic-photocatalytic composites is presented. A key aim of this review is to indicate that spinel and hexagonal ferrites are considered as an important element of heterogeneous photocatalytic systems and are responsible for the effective recycling of the photocatalytic materials.

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Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures

Cited by 28 publications

References 74 publications

Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

Surface and Trapping Energies as Predictors for the Photocatalytic Degradation of Aromatic Organic Pollutants

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

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Solvothermal growth of {0 0 1} exposed anatase nanosheets and their ability to mineralize organic pollutants. The effect of alcohol type and content on the nucleation and growth of TiO2 nanostructures

Cited by 28 publications

References 74 publications

Scheelite-Type Wide-Bandgap ABO4 Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

Scheelite-Type Wide-Bandgap ABO4 Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

Surface and Trapping Energies as Predictors for the Photocatalytic Degradation of Aromatic Organic Pollutants

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

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Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment

Scheelite-Type Wide-Bandgap ABO₄ Compounds (A = Ca, Sr, and Ba; B = Mo and W) as Potential Photocatalysts for Water Treatment