InVO4-sensitized TiO2 photocatalysts for efficient air purification with visible light

Xiao, Guangcan; Wang, Xinchen; Li, Danzhen; Fu, Xianzhi

doi:10.1016/j.jphotochem.2007.06.027

Cited by 134 publications

(58 citation statements)

References 32 publications

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“…It is notable that the VB edges were found to be in the range of 2.4-3.1 eV with band gaps within the range of 3.67-3.2 eV. [56][57][58] In the case of ZnO, the CB edge was found to be around À0.88 eV according to its typical band gap of 3.3 eV.…”

Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 95%

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

et al. 2014

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Heterojunctions are a well-studied material combination in photocatalysis studies, the majority of which aim to improve the efficacy of the catalysts. Developing novel catalysts begs the question of which photo-generated charge carrier is more efficient in the process of catalysis and the associated mechanism. To address this issue we have fabricated core-shell heterojunction (CSHJ) nanofibers from ZnO and TiO 2 in two combinations where only the 'shell' part of the heterojunction is exposed to the environment to participate in the photocatalysis. Core and shell structures were fabricated via electrospinning and atomic layer deposition, respectively which were then subjected to calcination. These CSHJs were characterized and studied for photocatalytic activity (PCA). These two combinations expose electrons or holes selectively to the environment. Under suitable illumination of the ZnO-TiO 2 CSHJ, e/h pairs are created mainly in TiO 2 and the electrons take part in catalysis (i.e. reduce the organic dye) at the conduction band or oxygen vacancy sites of the 'shell', while holes migrate to the core of the structure. Conversely, holes take part in catalysis and electrons diffuse to the core in the case of a TiO 2 -ZnO CSHJ. The results further revealed that the TiO 2 -ZnO CSHJ shows $1.6 times faster PCA when compared to the ZnO-TiO 2 CSHJ because of efficient hole capture by oxygen vacancies, and the lower mobility of holes.

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Section: Photocatalytic Activity Of Core-shell Heterojunction Nanobersmentioning

confidence: 95%

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

et al. 2014

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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]. The degradation of acetone in the gas phase under a visible light supplied by Sunlite 8 W white LED lamp phase has been achieved by exploiting Bi 2 WO 6 -modified TiO 2 nanoparticles [140].…”

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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“…Among the UV-related processes, the UV/TiO 2 process has been considered to be a promising alternative for the decomposition of various refractory contaminants in gaseous streams in recent decades. In particular, the photocatalytic oxi-dation of benzene in UV-irradiated TiO 2 has been reported by various authors [1][2][3][4][5][6]. Kinetic analysis on photocatalytic degradation of gaseous benzene has also been reported by Doucet et al [2], Zhong et al [7] and Wang and Ku [8].…”

Section: Introductionmentioning

confidence: 98%

“…In addition, a detailed discussion is presented on the influence of the initial concentration and gas flow rates of benzene on the degradation conversion, D p , apparent reaction rate constants, k r , and initial degradation rate, r 1) . Moreover, the adsorption and degradation kinetics of the photocatalytic degradation of benzene are investigated in terms of the Langmuir-Hinshelwood (L-H) kinetic model.…”

Section: Introductionmentioning

confidence: 99%

Investigation into Photocatalytic Degradation of Gaseous Benzene in a Circulated Photocatalytic Reactor (CPCR)

et al. 2008

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Due to the fact that suspended TiO 2 powder enjoys free contact with gaseous pollutant molecules in photocatalytic reactors, it can generally achieve better efficiency than immobilized TiO 2 catalysts. However, difficulties with the separation of this catalyst powder from treated pollutants and its re-use often limit its application. Therefore, a circulated photocatalytic reactor (CPCR) was designed to enhance the performance of the photocatalytic degradation of gaseous benzene. TiO 2 film photocatalysts were prepared by the sol-gel method at low temperatures and coated onto the inner wall of this reactor by a bonding agent composed of poly-(2, 2-dimethyl)-acrylic ethylene ester emulsion in which TiO 2 powder was characterized by FTIR, TEM and SEM. In particular, the influences of initial concentration and gas flow rate of benzene on the degradation conversion, D p , apparent reaction rate constants, k r , initial degradation rate, r, and the deactivation and regeneration of catalyst in the CPCR, were investigated. The results indicated that the degradation conversion, apparent reaction rate constants and initial degradation rate were closely correlated to the initial concentration of benzene. To elucidate the factors governing the observations, the adsorption characteristics and kinetics of the photocatalytic degradation of benzene were analyzed using the Langmuir adsorption isotherm and Langmuir-Hinshelwood kinetic model. It was found that the reaction kinetics were best described by a fixed pseudo-first-order kinetic equation of photocatalytic degradation of gaseous benzene in the CPCR.

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InVO4-sensitized TiO2 photocatalysts for efficient air purification with visible light

Cited by 134 publications

References 32 publications

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

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

Investigation into Photocatalytic Degradation of Gaseous Benzene in a Circulated Photocatalytic Reactor (CPCR)

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