Progress of 3d metal-doped zinc oxide nanoparticles and the photocatalytic properties

Muktaridha, Omar; Adlim, Muhammad; Suhendrayatna, Suhendrayatna; Ismail, Ismail

doi:10.1016/j.arabjc.2021.103175

Cited by 47 publications

(13 citation statements)

References 189 publications

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“…The photocatalytic efficiency of ZnO is, however, greatly reduced by its high recombination rate of photogenerated electrons and holes and also the serious photocorrosion effect in the aqueous medium . Hence, several modifications have been considered for increasing the efficiency of ZnO, such as doping with metals, − nonmetals, , or rare-earth elements or by making composite materials. In particular, composites of ZnO with materials, such as Al 2 O 3 , SiO 2 , glass, graphene, reduced graphene oxide, carbon nanotubes, etc., have recently attracted significant attention for improving the photocatalytic activity by overcoming individual limitations. − …”

Section: Introductionmentioning

confidence: 99%

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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For achieving unified functionalities of rare-earth free materials, the development of innovative zinc oxide and β-silicon carbide (ZnO@β-SiC) composites by a solid-state reaction method is presented. The evolution of zinc silicate (Zn2SiO4) is evidenced by X-ray diffraction when annealed in air beyond 700 °C. Detailed X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analyses reveal the involvement of silicon dioxide in forming Zn2SiO4. Transmission electron microscopy and the associated energy-dispersive X-ray spectroscopy elucidate the evolution of the zinc silicate phase at the ZnO/β-SiC interface, though it can be averted by vacuum annealing. These results manifest the importance of air in oxidizing SiC before a chemical reaction with ZnO from 700 °C. Finally, ZnO@β-SiC composites are found to be promising for methylene blue dye degradation under ultraviolet radiation, but the annealing above 700 °C is detrimental due to the evolution of a potential barrier in the presence of Zn2SiO4 at the ZnO/β-SiC interface.

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Section: Introductionmentioning

confidence: 99%

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

et al. 2023

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“…In Figure 2d, the exterior morphology of Co and Gd dual-added ZnO nanoparticles is shown, which indicates that the design has less shape of highly bound nanoparticles with a high increase in agglomeration. Doping caused a decrease in the average size of the spherical entity, as dopants filled the gaps within the ZnO nanostructure, resulting in smaller nanostructures [28]. The incorporation of Co and Gd into ZnO nanoparticles can cause a number of changes in their structure and properties, including alterations to their dimensional characteristics.…”

Section: Scanning Electron Microscope Analysismentioning

confidence: 99%

Tuning the Optical Properties of ZnO by Co and Gd Doping for Water Pollutant Elimination

Safeen

Safeen²,

Arif³

et al. 2023

Water

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In the present study, pure, Co, Gd, and Co/Gd di-doped ZnO nanoparticles were synthesized via the co-precipitation synthesis route. The prepared samples were characterized through different techniques such as the X-ray diffraction method (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, photoluminescence (PL)spectroscopy, and an impedance analyzer and vibrating sample magnetometer (VSM). The XRD pattern shows ZnO’s wurtzite hexagonal crystal structure; moreover, the shifting of characteristic peaks toward the lower angle indicates the inclusion of Co and Co/Gd in the ZnO host lattice. SEM micrographs show various morphologies such as rods, the agglomeration of particles, and spherical nanoparticles. The UV-Vis spectroscopy reveals that the absorption increased in the visible region and there was a substantial redshift for the doped samples. The bandgap decreased from 3.34 to 3.18 eV for the doped samples. The PL spectra show near-edge and inter-band transitions; the origin of inter-band transitions is attributed to the defect states present within the bands. The dielectric constant is strongly frequency dependent and decreases with Co and Co/Gd doping, while the electrical conductivity increases. A VSM study indicates that pure ZnO is diamagnetic, while the Co and Co/Gd doped ZnO nanoparticles showed ferromagnetic behavior. Under UV-visible light irradiation, the Co/Gd-ZnO nanoparticles showed higher photocatalytic activity than the ZnO nanoparticles. The enhanced photocatalytic activity may be attributed to a decreased bandgap with doping.

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“…Presumably, the dopants can increase the concentration of oxygen vacancies in the structure which further enhances the bactericidal effect of the photocatalyst [69]. It was reported that transition metal-doped ZnO particles have a synergistic effect on photocatalytic and antibacterial performances [15,47,70]. On the other hand, the EDS mapping showed some spots of Ni in the areas where ZnO film is thinner or cracked.…”

Section: Inactivation Of the Mixture Of M Luteus And S Typhimurium Ba...mentioning

confidence: 99%

“…Our previous studies [28,44] showed that the metallic underlayer can positively affect photocatalytic performance under both UV-B and visible light irradiation. Additionally, some studies suggest that the recombination rate of electron-hole can be reduced and photocatalytic efficiency improved using metallic substrates and transition metals dopants [45][46][47]. Another study reported that photocatalytic performance (including charge separation and absorption of visible light) can be enhanced by coupling semiconductors (such as TiO 2 , ZnO, Cu 2 O, CdS, etc.)…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Driven Photocatalytic Inactivation of Bacteria, Bacteriophages, and Their Mixtures Using ZnO-Coated HDPE Beads as Floating Photocatalyst

et al. 2022

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Semiconductor materials used as photocatalysts are considered among the most effective ways to treat biologically polluted water. Certainly, efficiency depends on the selection of photocatalyst and its substrate, as well as the possibility of its application in a broader spectrum of light. In this study, a reactive magnetron sputtering technique was applied for the immobilisation of ZnO photocatalyst on the surface of HDPE beads, which were selected as the buoyant substrates for enhanced photocatalytic performance and easier recovery from the treated water. Moreover, the study compared the effect on the inactivation of the microorganism between ZnO-coated HDPE beads without Ni and with Ni underlayer. Crystal structure, surface morphology, and chemical bonds of as-deposited ZnO films were investigated by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. Visible-light-induced photocatalytic treatment was performed on the Gram-negative and Gram-positive bacteria and bacteriophages PRD1, T4, and their mixture. Higher bacteria inactivation efficiency was obtained using the ZnO photocatalyst with Ni underlayer for the treatment of S. Typhimurium and M. Luteus mixtures. As for infectivity of bacteriophages, T4 alone and in the mixture with PRD1 were more affected by the produced photocatalyst, compared with PRD1.

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Progress of 3d metal-doped zinc oxide nanoparticles and the photocatalytic properties

Cited by 47 publications

References 189 publications

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

Tuning the Optical Properties of ZnO by Co and Gd Doping for Water Pollutant Elimination

Visible-Light-Driven Photocatalytic Inactivation of Bacteria, Bacteriophages, and Their Mixtures Using ZnO-Coated HDPE Beads as Floating Photocatalyst

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