Enhanced photocatalytic behavior of ZnO nanorods decorated with a Au, ZnWO4, and Au/ZnWO4 composite: Synthesis and characterization

Somdee, Assanee; Wannapop, Surangkana

doi:10.1016/j.colcom.2022.100591

Cited by 16 publications

(10 citation statements)

References 49 publications

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“…Nevertheless, to date, only a few works evaluate stability, an important property for feasible applications. In order to identify the reach of our contributions, Table 2 shows the photocatalytic activity from recent works employing Au/ZnO and other nanocomposites based on ZnO as potential catalysts for wastewater remediation testing MB under UV light 24,40,41,49‐58 . As shown in the table, most of the excitation sources used by other researchers have higher power than the lamp used in this work; higher power lamps can accelerate photocatalytic mechanisms.…”

Section: Resultsmentioning

confidence: 99%

“…For example, some works used organic ligands as thiol and amino molecules; 6,7 however, the main disadvantage was that, in order to remove the ligand, an additional process involving high temperatures was needed. Other ‘facile’ chemical methods need long stirring times (12 and 5 h), 8‐10 hazardous reducing agents (such as hydrazine hydrate and NaBH 4 ) 11‐17 or high annealing temperatures (above 450 °C) to obtain ZnO nanostructures, and Au deposition or the removal of any organic residues 16,18‐25 . Even photochemical processes lost their simplicity due long irradiation times (180, 600, and 720 min) 26‐28 .…”

Section: Introductionmentioning

confidence: 99%

“…Other 'facile' chemical methods need long stirring times (12 and 5 h), [8][9][10] hazardous reducing agents (such as hydrazine hydrate and NaBH 4 ) [11][12][13][14][15][16][17] or high annealing temperatures (above 450 °C) to obtain ZnO nanostructures, and Au deposition or the removal of any organic residues. 16,[18][19][20][21][22][23][24][25] Even photochemical processes lost their simplicity due long irradiation times (180, 600, and 720 min). [26][27][28] The stability of Au/ZnO nanocomposites is another important advantage compared with other systems; thus, it is necessary to report this property for any catalyst to be seriously considered for wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Au nanosphere content on ZnO nanoparticle surfaces as reusable and durable plasmonic nanocatalysts

García‐Velasco,

Bizarro,

Báez‐Rodríguez

et al. 2023

J of Chemical Tech & Biotech

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BackgroundAu/ZnO systems have been investigated in recent years as alternative to improve the photocatalytic performance obtained by pure ZnO and other nanocatalysts based on ZnO nanostructures. ZnO nanoparticles and Au/ZnO nanocatalysts were successfully synthesized by facile and low‐cost methods such hydrothermal synthesis and chemical reduction method, respectively. The plasmonic nanocatalysts were fabricated at different Au precursor (HAuCl4) concentrations (0.5 – 5 mM) to obtain different Au contents (0.31‐ 13.9 at.%) on ZnO surface. The influence of Au content on ZnO surface and photocatalytic activity was studied.ResultsPhotocatalytic activity of pure ZnO and Au/ZnO nanocatalysts were evaluated in the photodegradation of methylene blue (MB) solution under UV light. The Au/ZnO nanocatalyst with the lowest Au content (0.31 at.%) showed the best photocatalytic performance, reaching a MB degradation rate of 99.99 % within 60 min (an enhancement of 60% compared with ZnO nanoparticles) and a reaction rate constant of 4.186 min‐1 (x10‐2) that is higher than other novel and complex nanocatalysts based on ZnO. Moreover, 5 cycles of self‐cleaning and outstanding durability of 25 aging months were obtained to progress in photocatalytic applications.ConclusionAs we demonstrate, it is not necessary high amount of Au nanospheres on ZnO surface for enhance the photocatalytic activity. Our synthesis process offers the possibility to obtain the optimum amount of Au loading over ZnO surface for reaching better photocatalytic performance, good self‐cleaning ability and outstanding durability in comparison with other complex and recently reported catalysts (composites based on ZnO nanostructures).This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Au nanosphere content on ZnO nanoparticle surfaces as reusable and durable plasmonic nanocatalysts

García‐Velasco,

Bizarro,

Báez‐Rodríguez

et al. 2023

J of Chemical Tech & Biotech

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“…In another study, hydrothermally synthesized ZnO nanorods (ZnONRs) were decorated by ZnWO 4 , followed by deposition of AuNPs to form Au/ZnWO 4 /ZnONRs, and Au/ZnONRs with enhanced photocatalytic activities . Pure ZnO showed a regular excitation of electrons from VB to CB under visible light, while by adding AuNPs, thanks to the SPR feature, an injection of electrons to CB of semiconductor to reduce O 2 and holes to VB to oxidize H 2 O was facilitated.…”

Section: Plasmon-enhanced Photocatalysis For Environmental Remediationmentioning

confidence: 99%

Plasmon-Enhanced Photocatalysis Based on Plasmonic Nanoparticles for Energy and Environmental Solutions: A Review

Amirjani,

Amlashi,

Ahmadiani

2023

ACS Appl. Nano Mater.

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Plasmonic nanoparticles are able to enhance the photocatalytic performance of semiconductor nanoparticles using four main mechanisms of light scattering, light concentration, hot electron injections, and plasmon-induced resonance energy transfer. Pushing the semiconductor nanoparticles' absorption range to the visible and near-infrared and boosting the electron−hole generation quantum yield are the major effects. However, most of the reviewed papers lack a systematic design for conjugation of plasmonic nanoparticles with semiconductor nanoparticles, and they mainly benefited from the general enhancement because of the generated localized surface plasmon resonances. In this Review, we have systematically showed the importance of rational optical design of plasmonic-semiconductor nanoparticle conjugation for an efficient photocatalytic activity. The application of plasmon-enhanced phenomenon for the environmental remediation and green energy production was thoroughly reviewed. The degradation of organic dyes, air pollutants, volatile organic compounds, pesticides, and pharmaceutical compounds were the major reviewed works in environmental applications, while the green energy productions were limited to the role of plasmonic nanoparticles for the enhancement of H 2 /O 2 production, water splitting, and CO 2 reduction. This review can be a useful guideline for researchers working on enhancing the photocatalytic activity of the semiconductor nanoparticles and those interested in plasmon-enhanced phenomena by emphasizing the underlying mechanisms.

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“…Combining WO 3 and ZnWO 4 with matching energy level configuration is known to form a type II (staggered) heterojunction that is useful for increasing the lifetime and number of photogenerated holes compared to pristine WO 3 [40,41]. In addition, Au NP deposition is often used to improve the overall photocatalytic performances of photocatalytic metal oxides MOx [42,43]. The formation of Au-MOx interfaces allows a faster photogenerated charge carrier transfer and, therefore, improves the spatial separation of electron/holes pairs in the material.…”

Section: Photocatalytic Properties Of the Wo 3 -Based Nanocomposites ...mentioning

confidence: 99%

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

et al. 2022

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WO3 is a known photocatalytic metal oxide frequently studied for its depollution properties. However, it suffers from a high recombination rate of the photogenerated electron/holes pair that is detrimental to its performance. In this paper, we present a new chemical method to decorate WO3 nanoleaves (NLs) with a complementary metal oxide (ZnWO4) in order to improve the photocatalytic performance of the composite material for the abatement of 400 ppb NO2 under mild UV exposure. Our strategy was to synthesize WO3·2H2O nanoleaves, then, to expose them, in water-free organic solution, to an organometallic precursor of Zn(Cy)2. A structural water molecule from WO3·2H2O spontaneously decomposes Zn(Cy)2 and induces the formation of the ZnO@WO3·H2O nanocomposite. The material was characterized by electronic microscopy (SEM, TEM), TGA, XRD, Raman and solid NMR spectroscopies. A simple thermal treatment under air at 500 °C affords the ZnWO4@WO3 nanocomposite. The resulting material, additionally decorated with 1% wt. Au, presents a remarkable increase (+166%) in the photocatalytic abatement of NO2 under UV compared to the pristine WO3 NLs. This synthesis method paves the way to the versatile preparation of a wide range of MOx@WO3 nanocomposites (MOx = metal oxide).

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Enhanced photocatalytic behavior of ZnO nanorods decorated with a Au, ZnWO4, and Au/ZnWO4 composite: Synthesis and characterization

Cited by 16 publications

References 49 publications

Evaluation of Au nanosphere content on ZnO nanoparticle surfaces as reusable and durable plasmonic nanocatalysts

Evaluation of Au nanosphere content on ZnO nanoparticle surfaces as reusable and durable plasmonic nanocatalysts

Plasmon-Enhanced Photocatalysis Based on Plasmonic Nanoparticles for Energy and Environmental Solutions: A Review

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

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