Photocatalytic activity of TiO2-WO3 mixed oxides in relation to electron transfer efficiency

Dozzi, Maria Vittoria; Marzorati, Stefania; Longhi, Mariangela; Coduri, Mauro; Artiglia, Luca; Selli, Elena

doi:10.1016/j.apcatb.2016.01.004

Cited by 135 publications

(43 citation statements)

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“…Moreover, the decrease of the interfacial charge space of the WO 3 /TiO 2 NTs with increasing W content was also responsible for the reduction of photocurrent. Dozzi et al synthesized a series of titanium–tungsten mixed oxides through coupling of TiO 2 with varying WO 3 percentage by a base-catalyzed sol–gel method [175]. WO 3 plays a vital role in inhibiting charge recombination for efficient charge transfer to enhance the Cr(VI) reduction.…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

112

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

112

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“…5b, the strong O 1s peaks at 529.8 eV are attributed to the Ti-O bonds in the TiO 2 lattice, and the shoulder peaks at around 531.6 eV are related to surface hydroxyl groups. 5,[36][37][38] All samples exhibit identical Ti 2p and O 1s spectra, which indicates the oxidation states (Ti 4+ ) and oxygen species (lattice oxygen and surface hydroxyl groups of TiO 2 ) are the same for TiU1 through TiU4. The difference in surface chemistry, however, resides in the oxidation state of U.…”

Section: Xpsmentioning

confidence: 92%

“…5a shows core level binding energies at around 463.9 eV and 458.2 eV, which can be indexed to Ti 2p 1/2 and Ti 2p 3/2 of the Ti 4+ state in TiO 2 . 5,[36][37][38][39] In Fig. 5b, the strong O 1s peaks at 529.8 eV are attributed to the Ti-O bonds in the TiO 2 lattice, and the shoulder peaks at around 531.6 eV are related to surface hydroxyl groups.…”

Section: Xpsmentioning

confidence: 99%

Photocatalytic decomposition of Rhodamine B on uranium-doped mesoporous titanium dioxide

et al. 2017

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“…The photoreactions occur continually with electron accepting or donating species adsorbed on the surface of the semiconductor photocatalyst. Therefore, electron-hole recombination must be minimized for photocatalytically induced redox reactions to take place [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effective Carbon Dioxide Photoreduction over Metals (Fe-, Co-, Ni-, and Cu-) Incorporated TiO₂/Basalt Fiber Films

Yeon

Kwak

Park

et al. 2016

International Journal of Photoenergy

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Mineralogical basalt fibers as a complementary adsorbent were introduced to improve the adsorption of CO2over the surfaces of photocatalysts. TiO2photocatalysts (M-TiO2) incorporated with 5.0 mol.% 3d-transition metals (Fe, Co, Ni, and Cu) were prepared using a solvothermal method and mixed with basalt fibers for applications to CO2photoreduction. The resulting 5.0 mol.% M-TiO2powders were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible spectroscopy, photoluminescence, Brunauer, Emmett, and Teller surface area, and CO2-temperature-programmed desorption. A paste composed of two materials was coated and fixed on a Pyrex plate by a thermal treatment. The 5.0 mol.% M-TiO2/basalt fiber films increased the adsorption of CO2significantly, indicating superior photocatalytic behavior compared to pure TiO2and basalt fiber films, and produced 158~360 μmol gcat-1 L−1CH4gases after an 8 h reaction. In particular, the best performance was observed over the 5.0 mol.% Co-TiO2/basalt fiber film. These results were attributed to the effective CO2gas adsorption and inhibition of photogenerated electron-hole pair recombination.

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Photocatalytic activity of TiO2-WO3 mixed oxides in relation to electron transfer efficiency

Cited by 135 publications

References 50 publications

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Photocatalytic decomposition of Rhodamine B on uranium-doped mesoporous titanium dioxide

Effective Carbon Dioxide Photoreduction over Metals (Fe-, Co-, Ni-, and Cu-) Incorporated TiO₂/Basalt Fiber Films

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Photocatalytic activity of TiO2-WO3 mixed oxides in relation to electron transfer efficiency

Cited by 135 publications

References 50 publications

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Photocatalytic decomposition of Rhodamine B on uranium-doped mesoporous titanium dioxide

Effective Carbon Dioxide Photoreduction over Metals (Fe-, Co-, Ni-, and Cu-) Incorporated TiO2/Basalt Fiber Films

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Product

Resources

About

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Effective Carbon Dioxide Photoreduction over Metals (Fe-, Co-, Ni-, and Cu-) Incorporated TiO₂/Basalt Fiber Films