Visible-light photocatalytic degradation of methylene blue with laser-induced Ag/ZnO nanoparticles

Recently, zeolitic imidazolate framework-8 (ZIF-8) has been widely studied and used as a catalyst in various fields, due to its high specific surface area, tunable channels and thermal and chemical stability. In this paper, ZIF-8 was used as a precursor to fabricate a Ag/ZnO photocatalyst, and the influence of Ag on the photocatalytic activity of ZnO has been explored. All samples were characterised using XRD, SEM, TEM, and UV-vis diffuse reflectance spectra. The photocatalytic activity of all samples was evaluated by the degradation of a rhodamine B solution under UV light. The results show that ZIF-8 was completely transformed into ZnO when it was calcined at 550 C for 6 h, and Ag was well loaded onto ZnO. The photocatalytic efficiency of ZnO is 92.32%. When ZnO was doped with Ag, its photocatalytic efficiency was highly improved (99.64%). Furthermore, Ag/ZnO exhibited high photocatalytic stability. After five repeated cycles, the photocatalytic activity of Ag/ZnO was highly retained at 97.48%.

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“…Fig. 2a 18 These results indicate that ZIF-8 is absolutely transformed into ZnO, and that Ag is well loaded onto the ZnO.…”

Section: Resultsmentioning

confidence: 60%

ZIF-8 derived Ag-doped ZnO photocatalyst with enhanced photocatalytic activity

2018

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“…In this relation, A is absorption, k is constant, h is Planck's constant, ν is light frequency, n = 1 for direct electronic transition, n = 4 for indirect electron transition and E g is energy gap 45 . The A sample's optical energy gap was 3.25 eV that was smaller than the energy gap of the bulk samples of ZnO.…”

Section: Optical Studiesmentioning

confidence: 99%

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Hosseini

Sarsari

Kameli

et al. 2015

Journal of Alloys and Compounds

271

126

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Silver-doped ZnO nanoparticles were successfully fabricated at 400• C via a simple and rapid method based on short time solid state milling and calcination of precursor powders. The effect of Ag dilute doping on the structural, optical, and photocatalytic properties of ZnO nanoparticles was investigated by X-ray diffraction (XRD), UV-vis spectrophotometer and photoluminescence (PL) spectroscopy. X-ray analysis revealed that Ag doped ZnO solidified in hexagonal wurtzite structure. The intensity of deep level emission was reduced with increasing silver doping in PL measurement. The X-ray photoelectron spectroscopy (XPS) measurement predicted that Ag was mainly in the metallic state and ZnO was in the wurtzite structure. This metallic state accompanied by unique zinc oxide properties decolorized the methyl violet, efficiently. The first-principles calculation represented Ag deep level in ZnO with an n-type behavior, while in ZnO structure with grain boundary p-type nature via shallow states is dominant same as powder samples as studied in this present work. It was suggested that these Ag-doped ZnO nanoparticles may have good applications in optoelectronics, spintronics and wastewater treatment.

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“…In order to treat the dye effluents photocatalysis is one of the feasible methodologies that can be effectively exploited for the complete degradation of various dye pollutants [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photocatalytic Degradation of Methylene Blue Using V2O5 Nanoparticles

2017

ICDET-17, FABMS-17, RIECAE-17, RTET-17, ABMS-17 Feb. 2017

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Visible-light photocatalytic degradation of methylene blue with laser-induced Ag/ZnO nanoparticles

Cited by 155 publications

References 26 publications

ZIF-8 derived Ag-doped ZnO photocatalyst with enhanced photocatalytic activity

ZIF-8 derived Ag-doped ZnO photocatalyst with enhanced photocatalytic activity

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Visible Light Photocatalytic Degradation of Methylene Blue Using V2O5 Nanoparticles

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