Evaluation of sunlight induced structural changes and their effect on the photocatalytic activity of V2O5 for the degradation of phenols

Aslam, M.; Ismail, Iqbal M.I.; Salah, Numan; Chandrasekaran, S.; Qamar, Muhammad Tariq; Hameed, Abdul

doi:10.1016/j.jhazmat.2014.12.022

Cited by 106 publications

(68 citation statements)

References 52 publications

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“…37 In general, ROS can be generated using the incident photon energy and interfacial electron (e cb •− generation. 39 As an N-type semiconductor, 40 nFe 2 O 3 may have an upward-bending conduction band owing to the accumulation of positive charge within the space charge region of the electrostatic double layer. 34 Thus, the actual E c could be lower than −0.2 eV, and would allow electron transfer to the adsorbed O 2 molecules 22 Notably, conventional understanding precludes photoexcitation of nAl 2 O 3 owing to its high E g value.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Quantitative Analysis of Reactive Oxygen Species Photogenerated on Metal Oxide Nanoparticles and Their Bacteria Toxicity: The Role of Superoxide Radicals

Wang

Zhao

et al. 2017

Environ. Sci. Technol.

169

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Ecotoxicity of engineered nanoparticles (NPs) has become the focus of considerable attention because of their wide applications. Reactive oxygen species (ROS) play important roles in the toxicity mechanisms of engineered metal oxide NPs. This work aimed to understand quantitatively the contribution of photogenerated ROS on metal oxide NPs to their toxicity. The dynamic generation of O 2•− , • OH, and H 2 O 2 in aqueous suspensions of photoilluminated metal oxide nano-and bulk particles (TiO 2 , ZnO, V 2 O 5 , CeO 2 , Fe 2 O 3 , and Al 2 O 3 ) was measured by a continuous-flow chemiluminescence (CFCL) detection system. Superoxides were generated on all six nanoparticles as well as bulk TiO 2 and ZnO, with nano TiO 2 producing the highest concentration (180 nM). Hydroxyl radicals were detected on both nano-and bulk TiO 2 and ZnO, whereas H 2 O 2 was detected only on TiO 2 and ZnO nanoparticles. The generation of ROS can in general be interpreted by the electronic structures and surface defects of the NPs and the ROS redox potentials. Furthermore, acute toxicity of the six metal oxide particles to a luminescent bacterium, P. phosphoreum 502 was assessed after photoillumination. The toxicity effect was attributed to the long-lived O 2 •− radicals on the nanoparticlce, and its potency follows the order of TiO 2 > ZnO > V 2 O 5 > Fe 2 O 3 > CeO 2 > Al 2 O 3 , which is the same as the order of the O 2•− concentration measured by CFCL. Our work revealed quantitatively the important role superoxide radicals play in the toxicity of various metal oxide nanoparticles after photoillumination.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Quantitative Analysis of Reactive Oxygen Species Photogenerated on Metal Oxide Nanoparticles and Their Bacteria Toxicity: The Role of Superoxide Radicals

Wang

Zhao

et al. 2017

Environ. Sci. Technol.

169

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“…In some available studies, Bi 2 O 3 , WO 3 and V 2 O 5 [12][13][14][15] has established their candidacy as suitable sunlight active photocatalysts therefore, in this study, we evaluated the photocatalytic activity of pure CeO 2 in sunlight exposure for the degradation of stable phenolic substrates.…”

Section: Introductionmentioning

confidence: 99%

The effect of sunlight induced surface defects on the photocatalytic activity of nanosized CeO2 for the degradation of phenol and its derivatives

Aslam

Qamar

Soomro

et al. 2016

Applied Catalysis B: Environmental

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190

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“…It is believed that the photocatalysis can achieve its optimum utilization and commercial viability by replacing the existing expensive and technically complicated artificial light sources with the cheap and ever renewable natural excitation source such as sunlight. Except for the few reports available in the literature [11][12][13][14], almost all the photocatalytic studies are performed by artificial light sources. Such evolutions require either the development of new sunlight active photocatalysts or modifying the existing catalysts like TiO 2 and ZnO for optimum photocatalytic activity in natural sunlight.…”

Section: Introductionmentioning

confidence: 99%

The assessment of the photocatalytic activity of magnetically retrievable ZnO coated γ-Fe2O3 in sunlight exposure

Qamar

Aslam

Ismail

et al. 2016

Chemical Engineering Journal

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Evaluation of sunlight induced structural changes and their effect on the photocatalytic activity of V2O5 for the degradation of phenols

Cited by 106 publications

References 52 publications

Quantitative Analysis of Reactive Oxygen Species Photogenerated on Metal Oxide Nanoparticles and Their Bacteria Toxicity: The Role of Superoxide Radicals

Quantitative Analysis of Reactive Oxygen Species Photogenerated on Metal Oxide Nanoparticles and Their Bacteria Toxicity: The Role of Superoxide Radicals

The effect of sunlight induced surface defects on the photocatalytic activity of nanosized CeO2 for the degradation of phenol and its derivatives

The assessment of the photocatalytic activity of magnetically retrievable ZnO coated γ-Fe2O3 in sunlight exposure

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