Fabrication, characterization and high photocatalytic activity of Ag–ZnO heterojunctions under UV-visible light

Zhu, Xiaodong; Wang, Juan; Yang, Daixiong; Liu, Jiawei; He, Lili; Tang, Mao; Feng, Wei; Wu, Xiaoqiang

doi:10.1039/d1ra05060e

Cited by 74 publications

(40 citation statements)

References 53 publications

(91 reference statements)

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“…However, a subsequent decrease in the average crystal size of Ag-ZnO with an increase in Ag content might be ascribed to the dispersion of Ag nanoparticles in or near the boundary of ZnO lattice, which limits the alliance and diffusion of ZnO, thus hinders the growth of the nanocomposite. A similar scenario was reported elsewhere [57,58]. No further peaks were identi ed, suggesting no linked work function between Ag and ZnO and thus the synthesized Ag-ZnO nanocomposite is pure.…”

Section: X-ray Diffractionsupporting

confidence: 86%

“…The peaks intensity gradually increases with an increase in the Ag content, which signi es the successful formation of Ag nanoparticles on the ZnO surface. While the Ag peaks intensity increases, as the Ag concentration increases, the peak intensity of ZnO decreases, implying a decrease in the crystallinity and particle size in Ag-ZnO nanocomposites [57]. The average grain sizes (D) calculated from Scherrer's Eq.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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In situ facile green synthesis of Ag-ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection

Mtavangu

Machunda

Bruggen

et al. 2022

Preprint

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In this work, Ag-ZnO nanocomposites were prepared by a green synthesis route using aqueous leaf extract of Tetradenia riperia and investigated for antibacterial activity against Escherichia coli and Staphylococcus aureus. To optimize the synthesis of the Ag-ZnO, the effects of precursor concentrations, pH, and temperatures were studied. The Ag-ZnO nanocomposites were characterized by XRD, ATR-FTIR, FESEM, and TEM. Results show that the concentration of 8% Ag, the temperature of 80 oC, and a pH of 7–8 were optimal for the synthesis of Ag-ZnO nanocomposites. The XRD analysis showed the decrease in particle size of Ag-ZnO from 23.6 to 14.8 nm with an increase in Ag concentrations, which was further supported by FESEM analysis. TEM image of 8% Ag provides more information on the coexistence of Ag on ZnO where an average particle size of 14.8 nm was determined. The ATR-FTIR analysis confirmed the presence of phenolic compounds, which work as reducing and stabilizing agents. The antimicrobial activity results show that Ag-ZnO nanocomposite demonstrated a higher antimicrobial potency on Escherichia coli than on Staphylococcus aureus. Therefore, Tetradenia riperia leaf extract is a viable route for the synthesis of Ag-ZnO nanocomposites to be used for various applications, including water disinfection.

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Section: X-ray Diffractionsupporting

confidence: 86%

Section: X-ray Diffractionmentioning

confidence: 99%

In situ facile green synthesis of Ag-ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection

Mtavangu

Machunda

Bruggen

et al. 2022

Preprint

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show abstract

“…33 Under the SPR effect, the hot-electrons at the CB of semiconducting materials assist the photo-reduction of O 2 to produce superoxide ions (˙O 2 − ). 34,35 The holes accumulated on the surface of metal nanoparticles assist the photo-oxidation of H 2 O molecules to generate hydroxyl radicals (OH˙). 34…”

Section: Structures and Charge Separation Mechanisms Of Schottky-like...mentioning

confidence: 99%

“…34,35 The holes accumulated on the surface of metal nanoparticles assist the photo-oxidation of H 2 O molecules to generate hydroxyl radicals (OH˙). 34…”

Section: Structures and Charge Separation Mechanisms Of Schottky-like...mentioning

confidence: 99%

“…58 The variation in the trend of surface area may be dependent on different methods of synthesis and processes. 34 The band-gap of the Ag/TiO 2 underwent a red shift and was reduced to 2.2 eV due to typical band alignment causing band bending in Schottky-like structures (Table 1, entry 2). 56 Ag/TiO 2 supported the photo-catalytic degradation of Rhodamine B, leading to a kinetic constant of 16 × 10 −3 min −1 , while bare TiO 2 microspheres exhibited a lower catalytic efficiency with a kinetic constant of 5 × 10 −3 min −1 .…”

Section: Structures and Charge Separation Mechanisms Of Schottky-like...mentioning

confidence: 99%

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Engineering Schottky-like and heterojunction materials for enhanced photocatalysis performance – a review

et al. 2022

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Facile Synthesis of ZnO/Ag Nanostructure with Enhanced Photocatalytic Activity

et al. 2023

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A series of x%Ag/ZnO (x: 0; 1; 2; 5; 10) nanostructures were successfully synthesized through the facile method. The material's structures were confirmed through X‐ray diffraction, while their morphology, elemental distribution, and components were analyzed using cross‐sectional transmission electron microscopy (XTEM), Field‐emission scanning electron microscopy (FESEM). The optical properties of Ag/ZnO revealed a decrease in band gap from 3.2 eV to 2.83 eV and a significant reduction in photoluminescence intensity with increasing Ag nanoparticle loading on the surface of ZnO. The photocatalytic activity of synthesized Ag/ZnO flower‐like nanostructure was evaluated in the photodegradation of methylene blue (MB) under UV‐Vis irradiation. The photocatalytic results indicated that decorating Ag nanoparticles on the surface of ZnO improved the photodegradation of MB. Interestingly, the 5%Ag/ZnO showed the highest effectiveness, achieving a 99% removal efficiency of MB for 60 minutes under UV‐Vis irradiation. Notably, the ultra performance liquid chromatography‐ tandem mass spectroscopy (UPLC‐MS/MS) confirmed the structure of intermediates, while total organic carbon (TOC) removal was 47%. Moreover, the proposed mechanism for the charge transfer process was based on the results of radical scavenging experiments, which showed that superoxide was the dominant reactive species. Finally, the 5%Ag/ZnO was stable and reused at least five times.

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Fabrication, characterization and high photocatalytic activity of Ag–ZnO heterojunctions under UV-visible light

Abstract: Ag–ZnO heterojunction promotes the separation of photogenerated pairs and thus exhibits high catalytic activity under UV-visible light.

Cited by 74 publications

References 53 publications

In situ facile green synthesis of Ag-ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection

In situ facile green synthesis of Ag-ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection

Engineering Schottky-like and heterojunction materials for enhanced photocatalysis performance – a review

Facile Synthesis of ZnO/Ag Nanostructure with Enhanced Photocatalytic Activity

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