Electron trapping energy states of TiO 2 –WO 3 composites and their influence on photocatalytic degradation of bisphenol A

Žerjav, Gregor; Arshad, Muhammad Shahid; Djinović, Petar; Zavašnik, Janez; Pintar, Albin

doi:10.1016/j.apcatb.2017.02.059

Cited by 69 publications

(16 citation statements)

References 58 publications

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“…In our previous work, we could see that amorphous TiO 2 nanorods have higher specific surface area in comparison to the same TiO 2 nanorods that were calcined at 500 • C. By calcination, the amorphous TiO 2 transformed into anatase TiO 2 . The results of photocatalytic activity tests under UV-light illumination showed that calcined TiO 2 nanorods with better crystallinity and lower specific surface area exhibited higher photocatalytic activity [33]. On the other hand, there are some studies stating that disordered or amorphous or materials can display higher photocatalytic activity in comparison to their crystalline counterparts.…”

Section: Introductionmentioning

confidence: 99%

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Žerjav

Pintar

2020

Catalysts

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Solution combustion synthesis was used to produce a junction between different TiO2 supports (anatase TiO2 nanorods (TNR) and nanoparticles (TNP) and TiO2 with anatase core and amorphous shell (a-TNR)) and narrow bandgap (BG) semiconductor β-Bi2O3. β-Bi2O3 acted as a visible-light photosensitizer and enabled us to carry out photocatalytic oxidation of water dissolved bisphenol A (BPA) with TiO2 based catalysts under visible-light illumination. Heterojunction between TiO2 and β-Bi2O3 in TNR + Bi and TNP + Bi composites enables the transfer of visible-light generated holes from the β-Bi2O3 valence band (VB) to the upper lying TiO2 VB. A p–n junction, established upon close chemical contact between TiO2 and β-Bi2O3, enables the transfer of visible-light generated electrons in the β-Bi2O3 conduction band (CB) to the TiO2 CB. In TNR + Bi and a-TNR + Bi composites, the supplied heat energy during the synthesis of samples was not sufficient to completely transform (BiO)2CO3 into β-Bi2O3. A p–n junction between (BiO)2CO3 and β-Bi2O3 enables the transfer of electrons generated by β-Bi2O3 to (BiO)2CO3. Hindered charge carrier recombination originating from the crystallinity of TiO2 is a more important factor in the overall kinetics of BPA degradation than high specific surface area of the amorphous TiO2 and reduction/oxidation of surface adsorbed substrates.

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Section: Introductionmentioning

confidence: 99%

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Žerjav

Pintar

2020

Catalysts

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“…In our previous studies [4][5][6], we used different approaches to overcome the drawbacks of TiO 2 , thus improving its use as a photo-catalyst in heterogeneous photocatalytic oxidation of organic pollutants dissolved in water. We combined TiO 2 with the low band gap semiconductor, Bi 2 O 3 , to obtain a visible-light active photo-catalyst [3], or decorated different types of anatase TiO 2 nanorods with reduced graphene oxide (rGO) [4] to slow down the electron-hole recombination.…”

Section: Introductionmentioning

confidence: 99%

“…According to [17,18], increasing the exposure of (001) facets in TiO 2 nanocrystals decreases their photocatalytic activity in the decomposition of water. For photodegradation of phenol [19] and CO 2 methanation [6], increasing the exposure of (001) facets in TiO 2 anatase nanocrystals increased the catalytic activity to a maximum value. These differences are strongly dependent on the type of photocatalytic reaction, and are explained by synergistic effects in photocatalysis between (001) and (001) facets of anatase nanocrystals [6,18,20].…”

Section: Introductionmentioning

confidence: 99%

“…For photodegradation of phenol [19] and CO 2 methanation [6], increasing the exposure of (001) facets in TiO 2 anatase nanocrystals increased the catalytic activity to a maximum value. These differences are strongly dependent on the type of photocatalytic reaction, and are explained by synergistic effects in photocatalysis between (001) and (001) facets of anatase nanocrystals [6,18,20]. They may also be caused by the different chemical functionality of the corresponding crystallographic facets contributing to the surface transformation of substrates, i.e., Lewis and Brønsted acid sites [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Chemistry and Crystallographic Parameters of TiO2 Anatase Nanocrystals on Photocatalytic Degradation of Bisphenol A

et al. 2019

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The photocatalytic activity of a series of anatase TiO2 materials with different amounts of exposed (001) facets (i.e., 12% (TiO2-1), 38% (TiO2-3), and 63% (TiO2-3)) was tested in a batch slurry reactor towards liquid-phase bisphenol A (BPA, c0(BPA) = 10 mg/L, ccat. = 125 mg/L) degradation. Photo-electrochemical and photo-luminescence measurements revealed that with the increasing amount of exposed anatase (001) facets, the catalysts generate more electron-hole pairs and OH∙ radicals that participate in the photocatalytic mineralization of pollutants dissolved in water. In the initial stages of BPA degradation, a correlation between % exposure of (001) facets and catalytic activity was developed, which was in good agreement with the findings of the photo-electrochemical and photo-luminescence measurements. TiO2-1 and TiO2-3 solids achieved 100% BPA removal after 80 min in comparison to the TiO2-2 sample. Adsorption of BPA degradation products onto the TiO2-2 catalyst surface was found to have a detrimental effect on the photocatalytic performance in the last stage of the reaction course. Consequently, the global extent of BPA mineralization decreased with the increasing exposure of anatase (001) facets. The major contribution to the enhanced reactivity of TiO2 anatase (001) surface is the Brønsted acidity resulting from dissociative chemisorption of water on a surface as indicated by FTIR, TPD, and MAS NMR analyses.

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“…It is noteworthy that WO 3 can not only absorb visible light, accelerate electrons transfer, improve photons yield and photocatalytic efficiency, but also store photogenerated electrons and release these electrons in the absence of light source, making catalytic materials possess catalytic activity without light. Some studies have reported that WO 3 nanostructure can both improve photocatalytic activity and possess optical memory ability …”

Section: Introductionmentioning

confidence: 99%

WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

Zhao

Fang

Chen

et al. 2018

Applied Organom Chemis

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Graphene oxide/Mg‐doped ZnO/tungsten oxide quantum dots composites (WQGOMZ) were prepared through co‐precipitation method, and were studied by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), Fluorescence spectra (FL), and UV–vis diffuse reflection spectra. Furthermore, the photocatalytic activity of resultant WQGOMZ was evaluated under nature sunlight. Experimental results showed that WO3QDs can remarkably heighten the photocatalytic activity of GOMZ composite, in which is nearly 6.58 times higher than that of GOMZ composite. Simultaneously, WQGOMZ composites possess optical memory ability and maintain high photocatalytic stability for more than 40 days. The enhanced photocatalytic activity and optical memory ability are attributed to the effective synergistic effect between ZnO and WO3QDs.

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Electron trapping energy states of TiO 2 –WO 3 composites and their influence on photocatalytic degradation of bisphenol A

Cited by 69 publications

References 58 publications

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Effect of Surface Chemistry and Crystallographic Parameters of TiO2 Anatase Nanocrystals on Photocatalytic Degradation of Bisphenol A

WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

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Electron trapping energy states of TiO 2 –WO 3 composites and their influence on photocatalytic degradation of bisphenol A

Cited by 69 publications

References 58 publications

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Influence of TiO2 Morphology and Crystallinity on Visible-Light Photocatalytic Activity of TiO2-Bi2O3 Composite in AOPs

Effect of Surface Chemistry and Crystallographic Parameters of TiO2 Anatase Nanocrystals on Photocatalytic Degradation of Bisphenol A

WO3 Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

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WO₃ Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight