Facile synthesis of Ag-ZnO core–shell nanostructures with enhanced photocatalytic activity

Kadam, Abhijit N.; Bhopate, Dhanaji P.; Kondalkar, Vijay V.; Majhi, Sanjit Manohar; Bathula, Chinna; Tran, Vy Anh; Lee, Sang−Wha

doi:10.1016/j.jiec.2017.12.003

Cited by 194 publications

(73 citation statements)

References 56 publications

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“…The presence of C1s at 284.8 eV was ascribed to the carbon oxide adsorbed on the samples as mentioned earlier for the EDS spectra. The Zn2p spectra show that Zn2p 1/2 and Zn2p 3/2 peaks are positioned at binding energy of 1044.4 and 1021.3 eV, respectively, indicating that Zn essentially exists as Zn 2+ , similar to that observed in ZnO (Figure b) . Thus, the presence of Ag‐NP in Ag/ZnO‐2 does not change the structure and size of Zn ions.…”

Section: Resultsmentioning

confidence: 70%

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

Liu

Shan

Chen

et al. 2019

Applied Organom Chemis

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Recent advances in photocatalysis focus on the development of materials with hierarchical structure and on the surface plasmon resonance (SPR) phenomenon exhibited by metal nanoparticles (NPs). In this work, both are combined in a material where size-controllable Ag-NPs are uniformly loaded onto the hierarchical microporous and mesoporous and nanocolumnar structures of ZnO, resulting in Ag-NP/ZnO nanocomposites. The embedded Ag-NPs slightly decrease the hydrophobicity of fibrous ZnO, improve its wettability, and increase the absorption of formaldehyde (H 2 CO) onto the photocatalyst, all of this resulting in excellent photodegradation of formaldehyde in aqueous solution. Besides, we found that Ag-NPs with optimal size not only accelerate the charge transfer to the surface of ZnO, but also strengthen the SPR effect in the intercolumnar channels of fibrous ZnO particles combining with high concentration of photo-generated radical species. The micro-to-mesoporous ZnO is like a nanoarray packed Ag-NPs. With Ag-NPs of diameter 2.5 < ϕ < 6.5 nm, ZnO exhibits the most superior photodegradation rate constant value of 0.0239 min −1 with total formaldehyde removal of 97%. This work presents a new feasible approach involving highly sophisticated Ag-NP/ZnO architecture combining the SPR effect and hierarchically ordered structures, which results in high photocatalytic activity for formaldehyde photodegradation.

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Section: Resultsmentioning

confidence: 70%

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

Liu

Shan

Chen

et al. 2019

Applied Organom Chemis

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“…Zhao et al used ZnO particles with different shapes and proportions to adorn reduced graphene oxide and found that an adequate quantity of ZnO nanorings adorning reduced graphene oxide greatly enhanced the absorption of visible light and the intensity of photoluminescent emission [32]. Improvements in the photocatalytic performance of ZnO through doping with other metals or through composite formation have been reported in several other works [33][34][35][36][37]. Furthermore, the repeatable applicability of the nanomaterial in photocatalysis has been demonstrated to be affected by the control of properties of ZnO nanostructures, especially size and shape [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Solar-Light-Driven Efficient ZnO–Single-Walled Carbon Nanotube Photocatalyst for the Degradation of a Persistent Water Pollutant Organic Dye

et al. 2019

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An efficient photocatalyst, ZnO–single-walled carbon nanotube (ZnO–SWCNT) nanocomposite was successfully fabricated through a straightforward one-pot–two-chemical recrystallization technique followed by thermal decomposition. The photocatalytic efficiency of the prepared ZnO–SWCNT composite was investigated by assessing the degradation of a persistent water-pollutant dye (methylene blue, MB) under visible-light irradiation. We found that the synthesized photocatalyst is an effective and recyclable agent for the decomposition of an MB solution. Its photocatalytic performance was substantially better than that of pristine ZnO nanorods or pristine SWCNTs. The reusability of the photocatalyst was also examined, affirming that it could be used repeatedly for five cycles without conspicuous loss of morphology or catalytic performance.

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“…However, electron-hole recombinations inhibit the photocatalytic activity of pristine ZnO. Therefore, many attempts have been made to enhance the photocatalytic performance, such as by modification of the ZnO structure in order to increase the surface area and light absorption (Kadam et al, 2018). Furthermore, doping the ZnO nanoparticles with noble metals (Dermenci et al, 2014), lanthanide groups (Vaiano et al, 2017), natural zeolite (Rahman et al, 2018), and Fe3O4 (Winatapura et al, 2016) have also been reported as promising candidates for enhancing the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, doping the ZnO nanoparticles with noble metals (Dermenci et al, 2014), lanthanide groups (Vaiano et al, 2017), natural zeolite (Rahman et al, 2018), and Fe3O4 (Winatapura et al, 2016) have also been reported as promising candidates for enhancing the photocatalytic activity. In general, Ag nanoparticles are more attractive as dopants compared to other noble metals because of their high electrical and thermal conductivity, non-toxicity, cost-effectiveness, and high work function (Kadam et al, 2018). Kusdianto et al (2017) reported that the addition of Ag nanoparticles enhanced the photocatalytic activity of the nanocomposite produced by up to 35% compared to pristine TiO2 because Ag can be used as an electron acceptor to inhibit the electronhole recombination.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Activity of ZnO-Ag Nanocomposites Prepared by a One-step Process using Flame Pyrolysis

Kusdianto¹,

Widiyastuti²,

Nurtono³

et al. 2019

IJTech

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The degradation of organic pollutants using photocatalysis is more effective than conventional methods, with ZnO being the most widely used of the various semiconductor materials for application in photocatalysis. Unfortunately, degradation efficiency is inhibited by the electronhole recombination. The photocatalytic activity of ZnO can be enhanced by adding noble metals, such as Ag nanoparticles. However, the fabrication of ZnO˗Ag using liquid-phase processes is complicated and often requires multiple steps. In this study, the effects of Ag content, ranging from 0 to 20 wt%, in the photocatalytic activity of ZnO˗Ag nanocomposites are investigated. The nanocomposites were fabricated by a one-step process using flame pyrolysis and with zinc acetate and AgNO3 as the precursors. The nanocomposites were collected using an electrostatic precipitator and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption of the Brunauer-Emmett-Teller (BET) specific surface area. The XRD results confirm the existence of Ag nanoparticles in the prepared nanocomposites, whose crystallite size was not significantly influenced by the presence of the nanoparticles. The SEM indicated that the morphology of the nanocomposites produced was spherical, with some aggregates. Particle size distribution of the nanocomposites increased with higher Ag content. The photocatalytic activity of the produced nanocomposites, estimated by evaluating the degradation of the methylene blue aqueous solution under UV irradiation, showed that the highest photocatalytic performance was attained when the concentration of Ag was equal to 5 wt%.

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Facile synthesis of Ag-ZnO core–shell nanostructures with enhanced photocatalytic activity

Cited by 194 publications

References 56 publications

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

Solar-Light-Driven Efficient ZnO–Single-Walled Carbon Nanotube Photocatalyst for the Degradation of a Persistent Water Pollutant Organic Dye

Photocatalytic Activity of ZnO-Ag Nanocomposites Prepared by a One-step Process using Flame Pyrolysis

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