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

Aslam, M.; Qamar, Muhammad Tariq; Soomro, M. Tahir; Ismail, Iqbal M.I.; Salah, Numan; Almeelbi, Talal; Gondal, M.A.; Hameed, Abdul

doi:10.1016/j.apcatb.2015.06.050

Cited by 178 publications

(60 citation statements)

References 57 publications

(40 reference statements)

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“…The comparison of the resistance both in the high (semi-circular) and low (linear) predicted the comparable charge transfer ability of 0.5, 1 and 3wt% MoO 3 coated ZnO whereas a comparative increase in the resistance was established for 5wt% MoO 3 coated sample. In terms of photocatalysis, the same may be correlated to the better separation of photogenerated excitons (e --h + ), extended lifetime of the excited states and expected an enhanced generation of ROS[38]. The charge-discharge curves, in the dark and under illumination, are presented in the supporting information (Fig.…”

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confidence: 73%

MoO3 altered ZnO: A suitable choice for the photocatalytic removal of chloro-acetic acids in natural sunlight exposure

Qamar

Aslam

Rehan

et al. 2017

Chemical Engineering Journal

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The MoO 3 coated ZnO photocatalysts were synthesized for the optimum harvesting of the absorbed ultraviolet sunlight photons by initially permeating Mo 6+ ions at the surface of presynthesized ZnO and finally transformed to MoO 3 by thermal treatment in the air. The absorption spectra of the synthesized powders revealed the extension of the absorption edge in the visible region whereas, the photoluminescence spectroscopy established the supporting role of the MoO 3 coating in gradually plummeting the excitons recombination. The growth of additional peaks in Raman as well as x-ray photoelectron spectra and the appearance of the corresponding low-intensity reflection substantiated the surface prevalence of MoO 3. The absence of the individual particles of MoO 3 in FESEM and the verification of coated layer by HRTEM images validated the authenticity of the adopted synthetic route. The electrochemical evaluation of the synthesized powders under illumination revealed the complete elimination of photocorrosion and the synergic role of the MoO 3 layer for improved trap and transfer of charge carriers. The evaluation of the flat-band potentials of the coated powders by Mott-Schottky analysis revealed the suitability of the conduction band edges for the generation of superoxide anion radicals. The photocatalytic activity of the synthesized powders was assessed for the removal of chloro derivatives (mono-, di-, trichloroacetic acids) in comparison to pure acetic acid. A significant effect of the stability, polarity and stereochemical structure of the substrate on the photocatalytic removal process was observed and discussed. The experimental evidences from the timescale chemical analysis were interpreted for the identification of the reactive oxygen species (ROS) involved in the degradation/mineralization process. The validation of the Langmuir-Hinshelwood kinetic model was also examined. Efforts were made to estimate the plausible route of the degradation/mineralization process.

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confidence: 73%

MoO3 altered ZnO: A suitable choice for the photocatalytic removal of chloro-acetic acids in natural sunlight exposure

Qamar

Aslam

Rehan

et al. 2017

Chemical Engineering Journal

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“…The EIS spectra provide a deep insight to the resistance offered by the material to the transfer of electrons to the electrode surface and separation of the electron-hole pair [68,69]. The comparison of the EIS Nyquist plots of the exposed and pre-exposed α-Fe 2 O 3 , under illumination, is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

The evaluation of the photocatalytic activity of magnetic and non-magnetic polymorphs of Fe 2 O 3 in natural sunlight exposure: A comparison of photocatalytic activity

Aslam

Qamar

Rehman

et al. 2018

Applied Surface Science

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The non-magnetic and magnetic polymorphs of iron oxide (Fe 2 O 3 ) namely: α-Fe 2 O 3 (hematite) and γ-Fe 2 O 3 (maghemite) respectively, were synthesized by a facile surfactant aided hydrogel route. The synthesized polymorphs were characterized by diffuse reflectance, photoluminescence and raman spectroscopy for optical properties whereas the morphological, structural, chemical and electronic state evaluation were performed by FESEM, HRTEM, XRD, and XPS. The charge transport and the stability of the materials were examined electrochemically. The photocatalytic activity of the synthesized polymorphs was evaluated for the degradation of 2-chlorophenol and 2nitrophenol in the exposure of the visible region and complete spectrum natural sunlight.Both the polymorphs exhibited a significantly high activity for the degradation of the phenolic substrate in the exposure of the complete spectrum of sunlight, however, the activity in the visible region of the sunlight was relatively lower. A substantial increase in the activity in the visible region was noticed when the polymorphs were exposed to complete spectrum sunlight prior to the photocatalytic experiments. The comparison of the exposed and unexposed samples revealed the induction of defects that served as traps for the excited electrons and increased activity of the polymorphs.

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“…The second most cited article (207 citations) also fabricated Cd and Pb free quantum dots for solar cells, while the third most cited (119) article reviewed dynamic light scattering and zeta potential applied to drug delivery and therapuetic relevant nano‐formulations . Applied Catalysis B‐Environmental published the three top cited articles in chemical engineering, all of which concentrated on photocatalysis …”

Section: Applicationsmentioning

confidence: 99%

Experimental Methods in Chemical Engineering: Particle Size Distribution by Laser Diffraction—PSD

Bodycomb³

et al. 2019

Can J Chem Eng

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Particle size is the top cited physical property researchers report in The Canadian Journal of Chemical Engineering and among the top properties in all science disciplines. [1] Techniques to measure particle size distribution (PSD) include physical operations like sieving and sedimentation, and spectroscopic techniques like laser diffraction image analysis based on optical and electron microscopy, and elecro-zone instruments. Here we concentrate on laser diffraction analysis (LDA) and review its basic principles, operations, limitations, uncertainties, and mention how it compares to other techniques. LDA is an instantaneous, user-friendly, convenient, and non-destructive method to assess PSD of inorganic powders. It measures the scattering angle and intensity of light after it passes through diluted particle dispersions suspended in either a gas or liquid. The Mie theory is an exact solution to resolve the diffraction intensity of light caused by particles that applies to while the Fraunhoffer approximation applies only to particles greater than 20 μm. The 95 % confidence interval of five measurements of 56 μm and 0.1 μm irregularly shaped polyhedrons was ± 2.5 %. Based on a bibliometric analysis of LDA of the top 10 000 cited articles in 2016 and 2017, the major research clusters are: particle measurement, powder behaviour, pharmacy, comminution, and adsorption. Future work will continue to introduce more laser sources, combine multiple technologies, implement mobile light sources (dynamic light scattering), and better define characterize irregularly shaped particles.

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

Cited by 178 publications

References 57 publications

MoO3 altered ZnO: A suitable choice for the photocatalytic removal of chloro-acetic acids in natural sunlight exposure

MoO3 altered ZnO: A suitable choice for the photocatalytic removal of chloro-acetic acids in natural sunlight exposure

The evaluation of the photocatalytic activity of magnetic and non-magnetic polymorphs of Fe 2 O 3 in natural sunlight exposure: A comparison of photocatalytic activity

Experimental Methods in Chemical Engineering: Particle Size Distribution by Laser Diffraction—PSD

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