Efficient Degradation of Benzene over LaVO<sub>4</sub>/TiO<sub>2</sub> Nanocrystalline Heterojunction Photocatalyst under Visible Light Irradiation

Huang, Hanjie; Li, Danzhen; Lin, Qiang; Zhang, Wenjuan; Shao, Yu; Chen, Yibin; Sun, Meng; Fu, Xianzhi

doi:10.1021/es900393h

Cited by 268 publications

(124 citation statements)

References 28 publications

(35 reference statements)

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“…LaVO 4 /TiO 2 heterostructures prepared by the sol-gel method have been reported to efficiently degrade benzene in the gaseous phase in a fixed-bed reactor under irradiation with a 500 W Xe arc lamp [138]. Efficient air purification has been proposed by Xiao et al The InVO 4 -modified mesoporous nanocrystalline TiO 2 heterostructures prepared by the sol-gel method and the degradation of up to five organic pollutants (e.g., benzene, toluene, cyclohexane, acetone and/or ethylbenzene) have been investigated under 500 W Xe arc lamp irradiation [139].…”

Section: Photocatalytic Degradation Of Vocsmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.

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Section: Photocatalytic Degradation Of Vocsmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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“…The flat band potentials are summarised in table 3. . It is known that for n-type materials the flat band is located ~0.1 V anodically from the conduction band minimum 50,51 . Each shows a ~265 mV cathodic shift from the TiO2, indicating that the SILAR deposited BiVO4 is shifting the flat band upwards in energy by ~265 mV.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

BiVO₄‐TiO₂ Composite Photocatalysts for Dye Degradation Formed Using the SILAR Method

Odling

Robertson

2016

ChemPhysChem

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Composite photocatalyst films have been fabricated by depositing BiVO4 upon TiO2 via a sequential ionic layer adsorption reaction (SILAR) method. The photocatalytic materials were investigated by XRD, TEM, UV/Vis diffuse reflectance, inductively coupled plasma optical emission spectrometry (ICP-OES), XPS, photoluminescence and Mott-Schottky analyses. SILAR processing was found to deposit monoclinic-scheelite BiVO4 nanoparticles onto the surface, giving successive improvements in the films' visible light harvesting. Electrochemical and valence band XPS studies revealed that the prepared heterojunctions have a type II band structure, with the BiVO4 conduction band and valence band lying cathodically shifted from those of TiO2 . The photocatalytic activity of the films was measured by the decolourisation of the dye rhodamine 6G using λ>400 nm visible light. It was found that five SILAR cycles was optimal, with a pseudo-first-order rate constant of 0.004 min(-1) . As a reference material, the same SILAR modification has been made to an inactive wide-band-gap ZrO2 film, where the mismatch of conduction and valence band energies disallows charge separation. The photocatalytic activity of the BiVO4 -ZrO2 system was found to be significantly reduced, highlighting the importance of charge separation across the interface. The mechanism of action of the photocatalysts has also been investigated, in particular the effect of self-sensitisation by the model organic dye and the ability of the dye to inject electrons into the photocatalyst's conduction band.

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“…The photocatalytic experimental results indicated that most of the TiO 2 /Mo-TiO 2 heterostructures exhibited improved photocatalytic activity over pure TiO 2 and Mo-TiO 2 . As an n-type semiconductor, TiO 2 dominates the electronic conduction due to its oxygen vacancies, which is also true for Mo-TiO 2 [23,33]. During the preparation of composite TiO 2 /Mo-TiO 2 semiconductors, the prepared Mo-TiO 2 powders were fully dispersed into the pure TiO 2 sol, and the two were thoroughly combined through the drying and calcinating processes.…”

Section: Xps Analysismentioning

confidence: 99%

“…Recently, heterostructures (e.g. TiO 2 /ZnO, TiO 2 /CdS, TiO 2 /BiO 3 , TiO 2 / CeO 2 , and TiO 2 /LaVO 4 ) [19][20][21][22][23] have been investigated for the purpose of degrading aqueous waste dyes (e.g. rhodamine B, methylene blue, and bisphenol A), but few have been examined for the elimination of VOCs [24].…”

Section: Introductionmentioning

confidence: 99%

Physiochemical properties of n-n heterostructured TiO₂/Mo-TiO₂ composites and their photocatalytic degradation of gaseous toluene

Cui

Pan

Tang

et al. 2017

Chemical Speciation & Bioavailability

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The composite TiO 2 /Mo-TiO 2 were prepared by a modified sol-gel method. The prepared catalysts were characterized by X-ray diffraction, BET analysis, SEM, X-ray photoelectron spectroscopy, and UV-vis diffused reflectance spectroscopy techniques. The structural characterization results demonstrated that Mo was successfully doped into the TiO 2 lattice and caused slight changes in the physiochemical properties. The UV-vis DRS showed a red shift of the adsorption edge to the visible region. The photocatalytic decomposition efficiencies of the catalysts were examined with toluene as a typical VOC in a continuous flow reactor. The photocatalytic activity of the n-n heterogeneous TiO 2 /Mo-TiO 2 was greater than that of pure TiO 2 and Mo-TiO 2 , and the catalyst containing a Mo/Ti mole ratio of 2.5% exhibited optimum photocatalytic properties. In general, a relative humidity of 35%, a higher oxygen content, a lower initial toluene concentration, and a higher UV intensity were beneficial for toluene decomposition.

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Efficient Degradation of Benzene over LaVO₄/TiO₂ Nanocrystalline Heterojunction Photocatalyst under Visible Light Irradiation

Cited by 268 publications

References 28 publications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

BiVO₄‐TiO₂ Composite Photocatalysts for Dye Degradation Formed Using the SILAR Method

Physiochemical properties of n-n heterostructured TiO₂/Mo-TiO₂ composites and their photocatalytic degradation of gaseous toluene

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Efficient Degradation of Benzene over LaVO4/TiO2 Nanocrystalline Heterojunction Photocatalyst under Visible Light Irradiation

Cited by 268 publications

References 28 publications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

BiVO4‐TiO2 Composite Photocatalysts for Dye Degradation Formed Using the SILAR Method

Physiochemical properties of n-n heterostructured TiO2/Mo-TiO2 composites and their photocatalytic degradation of gaseous toluene

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Efficient Degradation of Benzene over LaVO₄/TiO₂ Nanocrystalline Heterojunction Photocatalyst under Visible Light Irradiation

BiVO₄‐TiO₂ Composite Photocatalysts for Dye Degradation Formed Using the SILAR Method

Physiochemical properties of n-n heterostructured TiO₂/Mo-TiO₂ composites and their photocatalytic degradation of gaseous toluene