Synthesis of silver-loaded ZnO nanorods and their enhanced photocatalytic activity and photoconductivity study

Pimpliskar, Prashant; Motekar, Shrinivas C.; Umarji, Govind; Lee, Won Young; Arbuj, Sudhir S.

doi:10.1039/c9pp00099b

Cited by 52 publications

(17 citation statements)

References 48 publications

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“…When ZnO is irradiated by the UV light of the simulated solar lamp, electrons in the valence band (VB) get excited to the conduction band (CB), leaving behind holes in the VB 81 . These photogenerated electrons get transferred to the Ag NPs as the CB energy level of ZnO is higher than the Fermi level (E FM ) of metallic Ag, which hinders the recombination and extends the lifetime of photogenerated (e‾/h + ) pairs, whereas Ag NPs in the NCs absorb visible light undergo surface plasmon resonance (SPR), and these excited electrons in the 3d orbit of Ag NPs get easily transferred to CB of ZnO owing to the interface effect of Ag/ZnO heterojunctions, yielding more superoxide anion radicals.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Sharwani

Narayanan

Khan

et al. 2022

Sci Rep

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Different approaches have been developed for the synthesis of various nanostructured materials with unique morphologies. This study demonstrated the photocatalytic and antimicrobial abilities of silver-loaded zinc oxide nanocomposites (Ag@ZnO NCs). Initially, ZnO with a unique mesoporous ellipsoidal morphology in the size range of 0.59 ± 0.11 × 0.33 ± 0.09 µm (length × width) was synthesized using aqueous precipitation in a mild hydrothermal condition (80 °C) with the aqueous fruit extract of goji berry (GB) (as an additive) and calcined in air at 200 °C/2 h and 250 °C/3 h. Powder X-ray diffraction (XRD) revealed the formation of a hexagonal phase of the wurtzite (WZ) structure. The average crystallite size of ZnO was 23.74 ± 4.9 nm as calculated using Debye–Scherrer’s equation. It also possesses higher thermal stability with the surface area, pore volume, and pore size of 11.77 m2/g, 0.027 cm3/g, and 9.52 nm, respectively. Furthermore, different mesoporous Ag@ZnO NCs loaded with face-centered cubic (fcc) silver nanoparticles (Ag NPs) in the range of 90–160 nm were synthesized by GB extract as a reducing and capping agent on the surface of ZnO after calcination in air. The immobilization of Ag NPs was confirmed by XRD, X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), FE-transmission electron microscopy (FE-TEM), and energy-dispersive X-ray spectroscopy (EDS). It was found that Ag0.2@ZnO NC (0.2 wt% of Ag) showed excellent photocatalytic degradation of both methylene blue (MB) (cationic) and congo red (CR) (anionic) dyes under simulated solar irradiation. The photocatalytic degradation of 99.3 ± 0.35% MB and 98.5 ± 1.3% CR occurred in 90 and 55 min, respectively, at room temperature by Ag0.2@ZnO NC. Besides, these NCs also showed broad-spectrum antibacterial activity against both Gram-positive and Gram-negative bacteria. The mechanistic concept of generating reactive oxygen species (ROS) by electron and hole charge (e‾/h+) carriers seems to be responsible for the photocatalytic degradation of commercial dyes and antibacterial activities by Ag@ZnO NCs. Thus, these silver-loaded mesoporous ellipsoidal ZnO NCs are promising candidates as photocatalysts for industrial/wastewater treatment as well as in antimicrobial therapeutics.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Sharwani

Narayanan

Khan

et al. 2022

Sci Rep

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“…O 2− and HO . produced under visible light irradiation are mainly involved in the degradation of MB dye molecules [54] …”

Section: Resultsmentioning

confidence: 99%

Preparation of Reduced ZnO/Ag Nanocomposites by a Green Microwave‐Assisted Method and Their Applications in Photodegradation of Methylene Blue Dye, and as Antimicrobial and Anticancer Agents

Saranya¹,

Alsawalha

Alomayri

et al. 2021

ChemistrySelect

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In this present study, we report a facile microwave assisted green synthesis of ZnO/Ag nanocomposites (denoted as G‐ZnO/Ag NCs) by employing Tridax procumbens leaf extract as a green solvent for photocatalytic, antimicrobial and cytotoxicity activities. The prepared nanocomposites was characterized by various techniques to study its crystallinity, morphology, structure, chemical composition, optical properties, and so on. The nanocomposites exhibited excellent photocatalytic performance (90.2 %) toward methylene blue degradation when irradiated under visible light (120 min). Furthermore, the G‐ZnO/Ag NCs showed good reusable properties up to four consecutive cycles. In addition, the resultant nanocomposites showed significant antimicrobial activity with the zones of inhibition of 9.85±0.12 and 10.51±0.63 mm against gram positive (Staphylococcus aureus) and 11.98±0.22 and 13.76±0.12 mm against gram‐negative (Escherichia coli), bacteria respectively, as measured using the well diffusion method. Although, the in‐vitro cytotoxicity test showed 39.58 % viability of MCF‐7 cells. In summary, this study suggest that G‐ZnO/Ag NCs as a promising tool for wastewater treatment and nano biomedical applications using low cost and eco‐friendly approach.

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“…The Ag decorated CdMoO 4 shows a strong emission peak at 530-540 nm along with some weak peaks also observable at 450-500 nm. 35 The peak could be assigned to the presence of Ag NPs on the surface of CdMoO 4 decreasing surface defects and suppressing charge carrier recombination, which is good for improving the photocatalytic activity. In addition to that, the emission peak intensity of CdMoO 4 is lowered with the addition Ag NPs, which is in accordance with Stern-Volmer quenching.…”

Section: Optical and Electronic Studiesmentioning

confidence: 98%

Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production

et al. 2019

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Synthesis of silver-loaded ZnO nanorods and their enhanced photocatalytic activity and photoconductivity study

Abstract: The photocatalytic activity of ZnO nanorods towards methylene blue dye degradation was enhanced by loading 0.5, 1, 5, and 10 mol% silver nanoparticles on the ZnO.

Cited by 52 publications

References 48 publications

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Preparation of Reduced ZnO/Ag Nanocomposites by a Green Microwave‐Assisted Method and Their Applications in Photodegradation of Methylene Blue Dye, and as Antimicrobial and Anticancer Agents

Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production

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Synthesis of silver-loaded ZnO nanorods and their enhanced photocatalytic activity and photoconductivity study

Abstract: The photocatalytic activity of ZnO nanorods towards methylene blue dye degradation was enhanced by loading 0.5, 1, 5, and 10 mol% silver nanoparticles on the ZnO.

Cited by 52 publications

References 48 publications

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Photocatalytic degradation activity of goji berry extract synthesized silver-loaded mesoporous zinc oxide (Ag@ZnO) nanocomposites under simulated solar light irradiation

Preparation of Reduced ZnO/Ag Nanocomposites by a Green Microwave‐Assisted Method and Their Applications in Photodegradation of Methylene Blue Dye, and as Antimicrobial and Anticancer Agents

Plasmonic Ag decorated CdMoO4 as an efficient photocatalyst for solar hydrogen production

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Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production