Nano-gold decorated ZnO: An alternative photocatalyst promising for NOx degradation

Lux, Kevin Castelló; Hot, Julie; Fau, Pierre; Bertron, Alexandra; Kahn, Myrtil L.; Ringot, Erick; Fajerwerg, Katia

doi:10.1016/j.ces.2022.118377

Cited by 14 publications

(6 citation statements)

References 106 publications

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“…These results agree with the fact that the bactericidal activity of photoactivated ZnO is enhanced when decorated with Au NPs [46]. Moreover, ESR measurements carried out by Kevin Castelló Lux et al showed a generation of radical oxygen species for both ZnO and Au/ZnO), higher for Au/ZnO [28,54].…”

Section: Effects Of Photocatalyts On E Coli Cellssupporting

confidence: 78%

“…The gold precursor (HAuCl 4 •3H 2 O, Sigma Aldrich, Saint-Quentin Fallavier, France) was used without further purification. To synthesize the decorated Au/ZnO material, the photo-deposition method was employed with the HAuCl 4 •3H 2 O precursor in water under UV-A irradiation using a 100W Xenon lamp (λ = 365 nm, 17 W/m 2 ) (UVP, Upland, USA) for one hour, as already described [54,68,69]. The amount of Au decoration was fixed to 1% wt to be comparable to the literature data [70].…”

Section: Synthesis Of the Au/zno Photocatalystmentioning

confidence: 99%

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Comparison of Photocatalytic Biocidal Activity of TiO2, ZnO and Au/ZnO on Escherichia coli and on Aspergillus niger under Light Intensity Close to Real-Life Conditions

Al Hallak,

Verdier,

Bertron

et al. 2023

Catalysts

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Microbial contamination of the surface of building materials and subsequent release of microbial particles into the air can significantly affect indoor air quality. Avoiding the development or, at least, reducing the quantity of microorganisms growing on building materials is a key point to reduce health risks for building occupiers. In that context, the antimicrobial activity of TiO2, ZnO and Au/ZnO was assessed by measuring log reductions of Escherichia coli and Aspergillus niger populations both in the dark and under a light intensity close to real-life conditions. The bactericidal activities (≥2.3 log reduction) of tested products were stronger than their fungicidal activities (≤1.4 log reduction) after 2 h of contact. Different parameters including concentration of photocatalyst, intensity of light (dark vs. 5 W/m2 UV-A), and duration of contact between photocatalyst and microbial cells and spores were investigated. Results of this study confirmed bactericidal activities of TiO2, ZnO and AuZnO on E. coli and brought new insight on their fungicidal activity on the spores of A. niger. They also confirmed the greatest antimicrobial efficiency of ZnO compared to TiO2 and its increased photocatalytic activity when decorated with Au, leading to the highest log reductions detected after 2 h of contact for both tested microorganisms (4 and 1.4 for E. coli and A. niger, respectively). The antimicrobial activity was enhanced by the duration of contact between microorganisms and nanoparticles of the different tested photocatalytic products.

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Section: Effects Of Photocatalyts On E Coli Cellssupporting

confidence: 78%

Section: Synthesis Of the Au/zno Photocatalystmentioning

confidence: 99%

Comparison of Photocatalytic Biocidal Activity of TiO2, ZnO and Au/ZnO on Escherichia coli and on Aspergillus niger under Light Intensity Close to Real-Life Conditions

Al Hallak,

Verdier,

Bertron

et al. 2023

Catalysts

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“…The above result can further be supported by X-ray diffraction (XRD) and Raman spectra. Compared with the TiO 2 /MoS x sample, a new XRD peak of Au at 38.1° and an Au-S Raman peak 41 , 42 confirm the selective deposition of Au nanoparticles on the MoS x surface (Supplementary Figs. 3 and 4 ).…”

Section: Resultsmentioning

confidence: 77%

Enhancing photocatalytic H2O2 production with Au co-catalysts through electronic structure modification

Zhang,

Gao,

Zhu

et al. 2024

Nat Commun

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Gold-based co-catalysts are a promising class of materials with potential applications in photocatalytic H2O2 production. However, current approaches with Au co-catalysts show limited H2O2 production due to intrinsically weak O2 adsorption at the Au site. We report an approach to strengthen O2 adsorption at Au sites, and to improve H2O2 production, through the formation of electron-deficient Auδ+ sites by modifying the electronic structure. In this case, we report the synthesis of TiO2/MoSx-Au, following selective deposition of Au onto a MoSx surface which is then further anchored onto TiO2. We further show that the catalyst achieves a significantly increased H2O2 production rate of 30.44 mmol g−1 h−1 in O2-saturated solution containing ethanol. Density functional theory calculations and X-ray photoelectron spectroscopy analysis reveal that the MoSx mediator induces the formation of electron-deficient Auδ+ sites thereby decreasing the antibonding-orbital occupancy of Au-Oads and subsequently enhancing O2 adsorption. This strategy may be useful for rationally designing the electronic structure of catalyst surfaces to facilitate artificial photosynthesis.

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“…The most extensive research is being conducted on the fabrication of ZnO-based nanocomposites and heterostructures [61,67]. The decoration of ZnO with precious metals such as gold, platinum, and others is also quite popular [68]. In addition, the influence of morphology, porosity, defects, and optical properties on the sensory properties of ZnO-based sensors are also being actively investigated [69].…”

Section: No Xmentioning

confidence: 99%

Metal Oxide-Based Sensors for Ecological Monitoring: Progress and Perspectives

Tereshkov,

Dontsova,

Saruhan

et al. 2024

Chemosensors

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This paper aims to provide a large coverage of recent developments regarding environmental monitoring using metal oxide-based sensors. Particular attention is given to the detection of gases such as H2, COx, SOx, NOx, and CH4. The developments and analyses of the design of sensors and types of metal oxide sensing materials are emphasized. The sensing mechanisms and peculiarities of metal oxides used in chemoresistive sensors are provided. The main parameters that affect the sensitivity and selectivity of metal oxide sensors are indicated and their significance to the sensor signal is analyzed. Modern data processing algorithms, employed to optimize the measurement process and processing of the sensor signal, are considered. The existing sensor arrays/e-nose systems for environmental monitoring are summarized, and future prospects and challenges encountered with metal oxide-based sensor arrays are highlighted.

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Nano-gold decorated ZnO: An alternative photocatalyst promising for NOx degradation

Cited by 14 publications

References 106 publications

Comparison of Photocatalytic Biocidal Activity of TiO2, ZnO and Au/ZnO on Escherichia coli and on Aspergillus niger under Light Intensity Close to Real-Life Conditions

Comparison of Photocatalytic Biocidal Activity of TiO2, ZnO and Au/ZnO on Escherichia coli and on Aspergillus niger under Light Intensity Close to Real-Life Conditions

Enhancing photocatalytic H2O2 production with Au co-catalysts through electronic structure modification

Metal Oxide-Based Sensors for Ecological Monitoring: Progress and Perspectives

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