Au-nanoparticle-supported ZnO as highly efficient photocatalyst for H2O2 production

Meng, Xianguang; Zong, Peixiao; Wang, Liang; Yang, Fan; Hou, Weishu; Zhang, Songtao; Li, Bingdong; Guo, Zhaoliang; Liu, Shanshan; Zuo, Guifu; Du, Yi; Wang, Tao; Roy, Vellaisamy A. L.

doi:10.1016/j.catcom.2019.105860

Cited by 46 publications

(27 citation statements)

References 23 publications

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“…Meng et al compared the activity of 0.1% Au/ZnO and 0.1% Au/TiO 2 in photocatalytic H 2 O 2 production and found the 0.1% Au/ZnO delivered an activity (1.5 mmol L −1 h −1 ) nearly an order of magnitude higher than the 0.1% Au/TiO 2 . [105] The higher performance was attributed to the selectivity of 0.1% Au/ZnO toward the concerted 2e − ORR pathway and the surface inertness of ZnO. Interestingly, the 0.1% Au/ZnO with small and well-dispersed Au NPs also outperformed the 1% Au/ZnO with larger NPs, because large Au NPs tended to promote the less efficient two-step singleelectron ORR and accelerate H 2 O 2 decomposition.…”

Section: Zinc Oxide (Zno)mentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

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Hydrogen peroxide (H 2 O 2 ) is a mild but versatile oxidizing agent with extensive applications in bleaching, wastewater purification, medical treatment, and chemical synthesis. The state-of-art H 2 O 2 production via anthraquinone oxidation is hardly considered a cost-efficient and environment-friendly process because it requires high energy input and generates hazardous organic wastes. Photocatalytic H 2 O 2 production is a green, sustainable, and inexpensive process which only needs water and gaseous dioxygen as the raw materials and sunlight as the power source. Inorganic metal oxide semiconductors are good candidates for photocatalytic H 2 O 2 production due to their abundance in nature, biocompatibility, exceptional stability, and low cost. Progress has been made to enhance the photocatalytic activity toward H 2 O 2 production, however, H 2 O 2 photosynthesis is still in the laboratory research phase since the productivity is far from satisfaction. To inspire innovative ideas for boosting the H 2 O 2 yield in photocatalysis, the most well-studied metal oxide photocatalysts are selected and the modification strategies to improve their activity are listed. The mechanisms for H 2 O 2 production over modified photocatalysts are discussed to highlight the facilitating role of the modification methods. Besides, methods for the quantification of H 2 O 2 and associated radical intermediates are provided to guide future studies in this field.

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Section: Zinc Oxide (Zno)mentioning

confidence: 99%

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Wang

Zhang

et al. 2021

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“…Thus, it is very common to find examples of applications of noble or rare metals (Ag-, Au-, Pt-, Ir-, etc.) that are doped onto or composited with different materials to produce highly efficient photocatalysts (Cao et al, 2020;Ibukun and Jeong, 2020;Meng et al, 2020;Xu et al, 2020) that may not be either sustainable or economically viable for most technological applications. Besides, the use of nanoparticles as catalysts is quite extended as the surface area increases when the particle size decreases, with the subsequent effect on efficiency for surface-based processes (Retamoso et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Stability Is Key for Large-Scale Implementation of Photocatalytic Surface-Attached Film Technologies in Water Treatment

et al. 2021

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Replacement of classical tertiary water treatment by chemical-free sunlight-driven photocatalytic units has been often proposed. Photocatalysts are required to be cost-effective, inert, chemically stable, reusable, and easy to separate and also that they are mechanically stable. The effect of mechanical stress on a photoactive TiO2 layer, and on its effectivity for degradation of phenol as a model pollutant, has been studied during photocatalytic water treatment using NUV–vis light. Sol–gel (SG) and liquid phase deposition (LPD) methods have been used to coat spherical glass beads with the photocatalyst (TiO2). Physicochemical characterization of coated glass beads has been performed by N2 adsorption–desorption isotherms, SEM, EDXS, and AFM. Phenol photocatalyzed degradation was carried out both in stirred batch and flow reactors irradiated with a medium-pressure Hg-vapor lamp (λ > 350 nm). Phenol concentration was determined by HPLC, and its photoproducts were identified using HPLC/MS. In the stirred batch reactor, all LPD-coated glass beads displayed higher catalytic activity than SG-coated ones, which increased with calcination temperature, 700°C being the most efficient temperature. Preliminary etching of the glass beads surface yielded dissimilar results; whereas, phenol photodegradation with SG-coated etched glass beads is twice faster than with unetched SG ones, the rate reduces to one-third using LPD etched instead of unetched LPD glass beads. Phenol photodegradation using LPD is similar both in stirred batch and flow reactors, despite the latter uses a lower catalyst load. LPD-etched catalyst was recovered and reused in the stirred batch reactor; its activity reduced sharply after the first use, and it also lost activity in successive runs, ca. 10% of activity after each “use and recover” cycle. In the flow reactor, activity loss after the first experiment and recycling (ca. 30%) was much larger than in the following runs, where the activity remained rather constant through several cycles. LPD is more adequate than SG for TiO2 immobilization onto glass beads, and their calcination at 700°C leads to relatively strong and reactive photocatalytic films. Still, TiO2-coated glass beads exhibited very low photoactivity compared to TiO2-P25 nanoparticles, though their separation is much easier and almost costless. The durability of the catalytic layer increases when using a flow reactor, with the pollutant solution flowing in a laminar regime through the photocatalyst bed. In this way, the abrasion of the photocatalytic surface is largely reduced and its photoactivity is better maintained.

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“…At present, the anthraquinone method for industrial H 2 O 2 production requires massive energy and organic solvents [ 6 ]. Compared with the anthraquinone method, the photocatalytic H 2 O 2 production over semiconductors, such as TiO 2 [ 7 , 8 ], ZnO [ 9 , 10 ], BiVO 4 [ 11 , 12 ], and carbon nitride (CN) [ 13 , 14 , 15 , 16 , 17 ] is an ideal pathway that only uses solar light as driving force. In particular, metal-free CN has attracted great attention due to its visible light-responsive, environmentally friendly, and easy-synthesis features [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…At present, the anthraquinone method for industrial H 2 O 2 production requires massive energy and organic solvents [6]. Compared with the anthraquinone method, the photocatalytic H 2 O 2 production over semiconductors, such as TiO 2 [7,8], ZnO [9,10], BiVO 4 [11,12], and carbon nitride (CN) [13][14][15][16][17] is an ideal pathway that only uses solar light as driving force. In particular, metal-free CN has attracted great attention due Typically, 12 g of β-CD (Yongda Chemical Reagent Co., Ltd, Tianjin, China) and 0.4228 g of NaOH (Yongda Chemical Reagent Co., Ltd, Tianjin, China) were mixed in 100 mL of water under vigorous stirring at 90 • C to remove the residual water.…”

Section: Introductionmentioning

confidence: 99%

A β-cyclodextrin Modified Graphitic Carbon Nitride with Au Co-Catalyst for Efficient Photocatalytic Hydrogen Peroxide Production

et al. 2020

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Photocatalytic hydrogen peroxide (H2O2) production has attracted considerable attention as a renewable and environment-friendly method to replace other traditional production techniques. The performance of H2O2 production remains limited by the inertness of graphitic carbon nitride (CN) towards the adsorption and activation of O2. In this work, a photocatalyst comprising of β-cyclodextrin (β-CD)-modified CN with supporting Au co-catalyst (Au/β-CD-CN) has been utilized for effective H2O2 production under visible light irradiation. The static contact angle measurement suggested that β-CD modification increased the hydrophobicity of the CN photocatalyst as well as its affinity to oxygen gas, leading to an increase in H2O2 production. The rate of H2O2 production reached more than 0.1 mM/h under visible-light irradiation. The electron spin resonance spectra indicated that H2O2 was directly formed via a 2-electron oxygen reduction reaction (ORR) over the Au/β-CD-CN photocatalyst.

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Au-nanoparticle-supported ZnO as highly efficient photocatalyst for H2O2 production

Cited by 46 publications

References 23 publications

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Mechanical Stability Is Key for Large-Scale Implementation of Photocatalytic Surface-Attached Film Technologies in Water Treatment

A β-cyclodextrin Modified Graphitic Carbon Nitride with Au Co-Catalyst for Efficient Photocatalytic Hydrogen Peroxide Production

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Au-nanoparticle-supported ZnO as highly efficient photocatalyst for H2O2 production

Cited by 46 publications

References 23 publications

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

Inorganic Metal‐Oxide Photocatalyst for H2O2 Production

Mechanical Stability Is Key for Large-Scale Implementation of Photocatalytic Surface-Attached Film Technologies in Water Treatment

A β-cyclodextrin Modified Graphitic Carbon Nitride with Au Co-Catalyst for Efficient Photocatalytic Hydrogen Peroxide Production

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Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production

Inorganic Metal‐Oxide Photocatalyst for H₂O₂ Production