Influence of hole-scavenger and different withdrawn speeds on photocatalytic activity of Co3O4 thin films under sunlight irradiation

Althamthami, Mohammed; Temam, Elhachmi Guettaf; Temam, Hachemi Ben; Hasan, Gamil Gamal; Malfi, Najran

doi:10.1016/j.ceramint.2022.07.078

Cited by 33 publications

(24 citation statements)

References 47 publications

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“…The literature has also reported the use of Co 3 O 4 and MnO 2 against MB dye with a degradation efficiency of 78% and 95.3 %, respectively. 58,59 Ahmad et al 58 studied the photocatalytic degradation of MB by CuO under irradiation of visible light. The synthesized CuO degraded the cationic dye in 120 min with an efficiency of 88%.…”

Section: Resultsmentioning

confidence: 99%

“…reported that increasing the amount of Mg 2+ ions in the ZnO lattice formed a recombination center for the photogenerated electron–hole pairs, decreasing the effective concentration of charge carriers. The literature has also reported the use of Co 3 O 4 and MnO 2 against MB dye with a degradation efficiency of 78% and 95.3 %, respectively 58,59 . Ahmad et al 58 studied the photocatalytic degradation of MB by CuO under irradiation of visible light.…”

Section: Resultsmentioning

confidence: 99%

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Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Bezerra Neta,

Andrade Neto,

Silva

et al. 2023

Int J Ceramic Engine & Sci

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Pure ZnO particles, doped and co‐doped with Cu2+ and Mg2+ ions were obtained by the simple sonochemical method. The wurtzite hexagonal structure was confirmed by X‐ray diffraction (XRD) patterns. The images obtained by field emission scanning electron microscopy (FE‐SEM) showed irregular and more agglomerated particles with the increase of Cu2+ and Mg2+ ions concentration in the ZnO lattice, with the average diameter of particles in the range of 57.23‐170.77 nm. The photocatalytic activity was investigated by decolorizing the methylene blue (MB) dye under UVC light irradiation which indicates that 1% Mg‐doped ZnO particles have better photocatalytic activity than the other samples, and presented the highest kinetic constant value. The co‐doped samples showed a reduced global surface area which did not favor the good photocatalytic performance. The sacrificial agents showed that OH· radicals are the main species involved in the photocatalytic activity of this system and defects generated in the ZnO lattice promoted photoluminescent emission in the red and green regions.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Bezerra Neta,

Andrade Neto,

Silva

et al. 2023

Int J Ceramic Engine & Sci

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“…Equations [3-9] display the mechanism for enhanced photocatalytic activity CuO@Fe 2 O 3 NC under sunlight radiations. Under solar irradiation, the transfer of electrons from the valence band (VB) to the conduction band (CB) of CuO@Fe 2 O 3 NC results in an energy level higher than the band gap of CuO@Fe 2 O 3 NC (1.6 eV), leading to the creation of valence band holes (h + ) and conduction band electrons (e − ) [43]. Photogenerated holes in the valence band may directly oxidize antibiotics (OH − ) while oxygen molecules (O 2 ) adsorbed on the surface of CuO@Fe 2 O 3 NC may be transformed into superoxide radicals by the photoelectrons in the conduction band (O − e).…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…Photogenerated holes in the valence band may directly oxidize antibiotics (OH − ) while oxygen molecules (O 2 ) adsorbed on the surface of CuO@Fe 2 O 3 NC may be transformed into superoxide radicals by the photoelectrons in the conduction band (O − e). As a result, both the antibiotics metronidazole and cephalexin may be destroyed by photocatalytic O 2 and OH [41][42][43].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Enhanced photocatalytic activity and antiviral evaluation of CuO@Fe₂O₃ NC for amoxicillin degradation and SARS-CoV-2 treatment

Legmairi,

Meneceur,

Hasan

et al. 2023

Nanotechnology

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Copper oxide nanoparticles (CuO NPs) and CuO NPs decorated with hematite (Fe2O3) nanocomposites (CuO@Fe2O3 NC) were biosynthesized by a green method using Portulaca oleracea leaves extract. The NC were characterized using various techniques, including X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and UV-Vis spectroscopy. The results showed that the synthesized CuO and CuO@Fe2O3 NC were crystalline with a monoclinic crystal structure and contained functional groups responsible for catalytic activity. The size of the nanocomposites ranged from 39.5 to 45.9 nm, and they exhibited a variety of agglomerated or aggregated shapes. The CuO@Fe2O3 NC showed improved photocatalytic activity for the degradation of antibiotics in water and wastewater and promising antiviral activity against SARS-CoV-2, indicating its potential for use in disinfection applications. The study investigated the impact of irradiation time on the photocatalytic degradation of Amoxicillin and found that increasing the irradiation time led to a higher degradation rate. The band gap energy (Eg) for pure CuO NPs was around 2.4 eV and dropped to 1.6 eV with CuO@Fe2O3 NC. In summary, the CuO@Fe2O3 NC has the potential to be an efficient photocatalyst and promising antiviral agent for environmental remediation. The CuO@Fe2O3 nanocomposites have been found to possess a high degree of efficacy in inactivating SARS-CoV-2 infectivity. The results of the study indicate that the nanocomposites exhibit potent anti-viral properties and hold significant potential for use in mitigating the spread of the virus.

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“…The films exhibited physical stability and excellent adhesion to the substrate, as was determined by using a tape test [56]. The gravimetric approach was employed to ascertain the film thickness (d) of ZnO thin films, using the following relation [57][58][59][60]:…”

Section: Measurement Of Film Thicknessmentioning

confidence: 99%

Effect of film thickness on the electrical and the photocatalytic properties of ZnO nanorods grown by SILAR technique

Yousra,

Guettaf Temam,

Saâd

et al. 2023

Phys. Scr.

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In this work, Zinc oxide (ZnO) thin films were synthesised by the successive ionic layer adsorption and reaction (SILAR) technique at various number of cycles (10–50 cycles). The effect of film thickness on the structural properties, surface morphology, optical and electrical properties, and sunlight assisted photocatalytic activities through photocatalytic degradation of Methylene Blue (MB) dye of ZnO thin films were studied. The energy dispersive x-rays (EDX) analysis confirmed the presence Zn and O elements. The x-rays diffraction (XRD) pattern showed the polycrystalline nature of ZnO thin films and the crystallite size increases with film thickness. The SEM images showed that a greater film thickness resulted in the growth of hexagonal nanorods arrays. Atomic force microscopy (AFM) images revealed that the surface roughness increases with film thickness yielding in an enhanced specific surface area. The UV—visible transmission spectra showed that increasing film thickness results in band gap expansion from 3.15 eV to 3.31 eV together with a reduction in optical transmittance. The estimated sheet resistance and resistivity were found to be in the range of 1.34–7.1 Ω sq−1 and 0.09–2.12 ×10–1 Ω.cm. The photocatalytic studies reveal that increasing film thickness leads to an improved photocatalytic efficiency of ZnO films. The enhanced photocatalytic activity of ZnO films is due to the increased surface area and low recombination rate of carriers charges (e−/h+), resulting from band gap expansion.

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Influence of hole-scavenger and different withdrawn speeds on photocatalytic activity of Co3O4 thin films under sunlight irradiation

Cited by 33 publications

References 47 publications

Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Enhanced photocatalytic activity and antiviral evaluation of CuO@Fe₂O₃ NC for amoxicillin degradation and SARS-CoV-2 treatment

Effect of film thickness on the electrical and the photocatalytic properties of ZnO nanorods grown by SILAR technique

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Influence of hole-scavenger and different withdrawn speeds on photocatalytic activity of Co3O4 thin films under sunlight irradiation

Cited by 33 publications

References 47 publications

Photoluminescent and photocatalytic properties of Cu2+ and Mg2+‐doped ZnO nanoparticles obtained by a facile sonochemical method

Photoluminescent and photocatalytic properties of Cu2+ and Mg2+‐doped ZnO nanoparticles obtained by a facile sonochemical method

Enhanced photocatalytic activity and antiviral evaluation of CuO@Fe2O3 NC for amoxicillin degradation and SARS-CoV-2 treatment

Effect of film thickness on the electrical and the photocatalytic properties of ZnO nanorods grown by SILAR technique

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Product

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Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Photoluminescent and photocatalytic properties of Cu²⁺ and Mg²⁺‐doped ZnO nanoparticles obtained by a facile sonochemical method

Enhanced photocatalytic activity and antiviral evaluation of CuO@Fe₂O₃ NC for amoxicillin degradation and SARS-CoV-2 treatment