Nanostructured cerium-doped ZnO for photocatalytic degradation of pharmaceuticals in aqueous solution

The quest for improved visible light absorption in ZnO-based photocatalysts and photodetectors is a prevailing research problem. One method of solving this problem is by narrowing the band gap of this material well into the range of visible light energy. In this work, we have demonstrated considerable band narrowing into the visible region in our electrospun ternary ZnO-Zn 2 SnO 4 nanofibres. We also showed that band narrowing is highly dependent on the amount of Sn in the synthesized composite which could be attributed to the creation of localized states in the ZnO band and the attendant structural changes. However, beyond 15%wt doping there were observed changes in the trend of the bandgap reduction, crystallite sizes, and width of the localized states in the ternary ZnO-Zn 2 SnO 4 band. The details of experimental procedures and discussion of results have been included in this paper.

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“…This relation is given by Gadallah and Nahass [40] in Equation (5). The extinction coefficient of the material was determined using Equation (5).…”

Section: Refractive Index and Extinction Coefficientmentioning

confidence: 99%

“…ZnO is one of the most explored materials for photocatalysis and photodegradation applications [1][2][3][4][5]. However, the bandgap energy of pure zinc oxide makes it only favourable for ultraviolet-assisted photocatalytic and photodegradation despite its versatility.…”

Section: Introductionmentioning

confidence: 99%

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Bolarinwa

Onuu

Animashaun

et al. 2020

Journal of Taibah University for Science

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“…Transition metals such as Fe, Ni, Cu, and Ce are used to improve the properties of ZnO [ 20 ]. Cerium receives special attention for enabling the formation of oxygen vacancies and acting as an electron-capturing agent [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

et al. 2021

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Ibuprofen (IBU) is one of the most-sold anti-inflammatory drugs in the world, and its residues can reach aquatic systems, causing serious health and environmental problems. Strategies are used to improve the photocatalytic activity of zinc oxide (ZnO), and thosethat involvethe inclusion of metalhave received special attention. The aim of this work was to investigate the influence of the parameters and toxicity of a photoproduct using zinc oxide that contains cerium (ZnO-Ce) for the photodegradation of ibuprofen. The parameters include the influence of the photocatalyst concentration (0.5, 0.5, and 1.5 g L−1) as well as the effects of pH (3, 7, and 10), the effect of H2O2, and radical scavengers. The photocatalyst was characterized by Scanning Electron Microscopy-Energy Dispersive Spectroscopy, Transmission electron microscopy, Raman, X-Ray Diffraction, surface area, and diffuse reflectance. The photocatalytic activity of ibuprofen was evaluated in an aqueous solution under UV light for 120 min. The structural characterization by XRD and SEM elucidated the fact that the nanoparticle ZnO contained cerium. The band gap value was 3.31 eV. The best experimental conditions for the photodegradation of IBU were 60% obtained in an acidic condition using 0.50 g L−1 of ZnO-Ce in a solution of 20 ppm of IBU. The presence of hydrogen peroxide favored the photocatalysis process. ZnO-Ce exhibited good IBU degradation activity even after three photocatalytic cycles under UV light. The hole plays akey role in the degradation process of ibuprofen. The toxicity of photolyzed products was monitored against Artemia salina (bioindicator) and did not generate toxic metabolites. Therefore, this work provides a strategic design to improve ZnO-Ce photocatalysts for environmental remediation.

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“…Thus, the development of advanced materials of promising adsorption and photocatalytic properties to remove levofloxacin from water is of great interest to the environmental and the scientific communities 5 . Numerous materials were applied for this target including MoS 2 nanosheet decorated by Ag 2 Mo 2 O 7 5 , goethite 6 , Bi 3 O 4 Cl/BiOCl composite 7 , BiVO 4 -CeVO 4 4 , biochar 2 , MnO@MnOx 8 , cerium-doped ZnO 9 , graphene oxide-CdS 10 , Ag/AgCl@ZIF-8 modified g-C 3 N 4 11 , and MoS 2 /TiO 2 12 . Unfortunately, most of the introduced materials suffer from some disadvantages that may include the high preparation cost, low removal capacities, and complex preparation techniques.…”

Section: Introductionmentioning

confidence: 99%

“…, goethite 6 , Bi 3 O 4 Cl/ BiOCl composite 7 , BiVO 4 -CeVO 4 4 , biochar 2 , MnO@MnOx 8 , cerium-doped ZnO 9 , graphene oxide-CdS 10 , Ag/ AgCl@ZIF-8 modified g-C 3 N 4 11 , and MoS 2 /TiO 2 12 . Unfortunately, most of the introduced materials suffer from some disadvantages that may include the high preparation cost, low removal capacities, and complex preparation techniques.…”

mentioning

confidence: 99%

Enhanced decontamination of levofloxacin as toxic pharmaceutical residuals from water using CaO/MgO nanorods as a promising adsorbent

Abukhadra

Basyouny

AlHammadi

et al. 2020

Sci Rep

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Novel MgO/CaO nanocomposite (MgO/CaO NRs) was synthesized by the hydrothermal method using diatomite porous frustules as a substrate under the microwave irradiation. The composite appeared as well crystalline rod-like nanoparticles with 52.3 nm as average particle size and 112.8 m2/g as BET surface area. The synthetic MgO/CaO NRs were addressed as a novel adsorbent for promising removal of levofloxacin (LVX) as pharmaceutical residuals. The adsorption studies revealed effective uptake of levofloxacin by MgO/CaO NRs with theoretical qmax of 106.7 mg/g and the equilibrium time of 720 min considering the best pH value (pH 7). The equilibrium studies highly fitted with the Langmuir model of monolayer adsorption considering the values of Chi-squared (χ2) and determination coefficient. The estimated adsorption energy from Dubinin–Radushkevich (0.2 kJ/mol) signifies physisorption mechanisms that might be coulombic attractive forces considering the kinetic studies. The thermodynamic addressing for the reactions verified their spontaneous and exothermic nature within a temperature range from 303 to 333 K. Additionally, the prepared MgO/CaO NRs show significant recyclability properties to be used in realistic remediation process and its uptake capacity is higher than several studied adsorbents in literature.

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Nanostructured cerium-doped ZnO for photocatalytic degradation of pharmaceuticals in aqueous solution

Cited by 73 publications

References 59 publications

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

Enhanced decontamination of levofloxacin as toxic pharmaceutical residuals from water using CaO/MgO nanorods as a promising adsorbent

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Nanostructured cerium-doped ZnO for photocatalytic degradation of pharmaceuticals in aqueous solution

Cited by 73 publications

References 59 publications

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn2SnO4 electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn2SnO4 electrospun nanofibre composite

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

Enhanced decontamination of levofloxacin as toxic pharmaceutical residuals from water using CaO/MgO nanorods as a promising adsorbent

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Product

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Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite

Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite