Effects of Au and F co-modification by thermal shock method on the photocatalytic activity of ZnO

Vu, Thien Kim Tran; Lê, Tiến Khoa; Hoang, Minh Hien; Dang, Hoang Anh; Nguyen, Dieu; Hoang, Thanh Truc Nguyen; Tsai, De‐Hao; Nguyen, Huu Khanh Hung; Huỳnh, Thị Kiều Xuân

doi:10.1016/j.matchemphys.2020.124092

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…The peak at 82 eV was assigned to the Au 4f7/2 of Au 0 , while the peaks at 87 and 91 eV were assigned to the Au 4f5/2 of Au 3+ (Fig. 5(f)) (Sylvestre et al, 2004;Dillip et al, 2020;Tran Vu et al, 2021). The optical absorption properties of the samples are shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

Photoredox-Catalyzed Decomposition of Nitric Oxide over Au-Enhanced Surface Plasmon Resonance ZnSn(OH)6 Microcubes

Pham

Nguyen²,

You³

et al. 2023

Aerosol Air Qual. Res.

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Air pollution is one of the most concerning issues today because of its adverse effects on living organisms and the environment. Therein, nitric oxide (NO) is the leading cause of the greenhouse effect, acid rain, and respiratory diseases. Therefore, discovering a low-cost, environmentally friendly, highly efficient photocatalysis technique to remove NO is necessary and urgent. In this work, the ZnSn(OH)6 microcubes (cZHS) catalyst was decorated with golden nanoparticles (Au:cZHS) to enhance the photoredox-catalyzed degradation of NO under solar light by surface plasmon resonance (SPR). This work demonstrated the contribution of SPR to the photoredox performance of the ZHS. Herein, the photoredox efficiency of the cZHS increased dramatically under the effecting of SPR from the golden nanoparticles, the photoredox efficiency of the Au:cZHS reached 75%, about four times higher than that of cZHS. In addition, the generation of other nitrogen species, nitrogen dioxide (NO2) conversion, and the reusability of the materials are calculated and discussed carefully by theory and experiment. On the other hand, the contribution and lifespan of radicals are also investigated clearly with trapping experiments and time-dependent electron spin resonance (ESR). This study provided the reader with a clear understanding of the SPR effect on the photocatalytic performance of cZHS, which may be necessary for future related studies.

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Section: Resultsmentioning

confidence: 97%

Photoredox-Catalyzed Decomposition of Nitric Oxide over Au-Enhanced Surface Plasmon Resonance ZnSn(OH)6 Microcubes

Pham

Nguyen²,

You³

et al. 2023

Aerosol Air Qual. Res.

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“…This means that this MB solution is stable under UV irradiation, unlike those in other works that reported a considerable effect of UV light on MB (% deg > 5); 4,[36][37][38] these results could be due to the highpower lamps used during research. Other studies do not report photolysis effects in their MB degradation results; 12,19,25,[39][40][41][42] even when photolysis is measured, their reported degradation percentages are not reliable and comparison with other catalysts is not possible. On the other hand, the adsorption of MB onto ZnO and Au/ZnO surfaces was carried out as expected.…”

Section: Photocatalytic Activitiesmentioning

confidence: 97%

“…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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Industrial Sideline Testing of Photocatalytic Equipment for the Treatment of Volatile Organic Compounds

Hu,

Xiao,

Wang

et al. 2023

Chem Eng & Technol

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Volatile organic compounds (VOCs) are the primary pollutant emitted by chemical laboratories, causing significant damage to the environment and posing a serious threat to human health. In this study, an industrial‐scale photocatalytic device was constructed for the removal of VOCs. The effectiveness of the photocatalytic device in removing gases such as ethyl acetate, dichloromethane, petroleum ether, and formaldehyde was investigated. The effects of gas flow rate, inlet concentration, temperature, and relative humidity on photocatalytic purification efficiency were revealed, which laid an important foundation for the further development of the industrial‐scale photocatalytic device.

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Effects of Au and F co-modification by thermal shock method on the photocatalytic activity of ZnO

Cited by 4 publications

References 42 publications

Photoredox-Catalyzed Decomposition of Nitric Oxide over Au-Enhanced Surface Plasmon Resonance ZnSn(OH)6 Microcubes

Photoredox-Catalyzed Decomposition of Nitric Oxide over Au-Enhanced Surface Plasmon Resonance ZnSn(OH)6 Microcubes

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

Industrial Sideline Testing of Photocatalytic Equipment for the Treatment of Volatile Organic Compounds

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