Understanding the Correlation of Crystal Atoms with Photochemistry Property: Zn5(OH)6(CO3)2vs. ZnCO3

Liu, Zhe; Teng, Fei

doi:10.1002/slct.201801420

Cited by 22 publications

(5 citation statements)

References 36 publications

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“…Based on the XPS spectra of ZnO powder and Zn foil (see Supporting Information Figures S3 and S4 and Table S1), the peak at 1022.4 eV is assigned to bulk zinc oxide. The peak at higher binding energy compared with that of the ZnO peak is often observed when other species such as carbonate, 58 acetate, 59 and hydroxide 60 are formed on the surface of ZnO. Thus, we attributed the peak at 1023.3 eV to the adsorbate-derived peak, although the broadness of the Zn 2p peak makes it difficult to deconvolute the overlapping peaks corresponding to those species unambiguously.…”

Section: ■ Resultsmentioning

confidence: 98%

Operando Characterization of Copper–Zinc–Alumina Catalyst for Methanol Synthesis from Carbon Dioxide and Hydrogen by Ambient-Pressure Hard X-ray Photoelectron Spectroscopy

et al. 2023

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Operando spectroscopy is a potent tool for characterizing heterogeneous catalysts under working conditions. In this study, ambient-pressure hard X-ray photoelectron spectroscopy (AP-HAXPES) of an industrial copper–zinc–alumina methanol synthesis catalyst was performed to reveal the surface chemical states of the catalyst and adsorbed intermediates during the catalytic reaction. In situ formation of metallic Cu particles was detected by operando AP-HAXPES during the reduction process of the catalyst under a hydrogen atmosphere, as well as the incorporation of Al atoms into zinc oxide (ZnO). Mass spectrometry analysis of the reaction products in the presence of near ambient-pressure CO2 and H2 gases shows the formation of methanol and CO via the reverse water-gas shift (rWGS). Temperature dependence differs between rWGS and methanol synthesis; the reaction products of rWGS monotonically increased as a function of the sample temperature between 420 and 533 K, whereas the rate of the methanol synthesis reached a maximum at 480 K and decreased at higher temperatures. The observed temperature dependence of methanol synthesis correlates well with the dynamic changes in the chemical state of the catalyst and the reaction intermediates adsorbed on the surface of the catalyst. The interfacial ZnO sites are probably responsible for the methanol synthesis under the present near-ambient pressure conditions. The present AP-HAXPES measurements clearly show the importance of operando characterization of the dynamic nature of heterogeneous catalysts.

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Section: ■ Resultsmentioning

confidence: 98%

Operando Characterization of Copper–Zinc–Alumina Catalyst for Methanol Synthesis from Carbon Dioxide and Hydrogen by Ambient-Pressure Hard X-ray Photoelectron Spectroscopy

et al. 2023

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“…The results of the FTIR evaluation (Figure 3) show that the absorbed peaks between 620 and 1430 cm –1 are related to the C-O (Liu and Teng, 2018; Lopes et al, 2018) bonds related to the various metal (mostly Ca) carbonate compounds (X-CO 3 ) in the travertine. Clearly, these bonds have disappeared with increasing calcination temperature.…”

Section: Resultsmentioning

confidence: 99%

Low-cost biodiesel production using waste oil and catalyst

2020

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With the production of renewable biofuels, concerns about the end of fossil fuels have been partially eliminated. On the other hand, the utilization of low-cost and waste materials to provide the raw essential substances to manufacture these fuels is of paramount importance. Biodiesel is one of these fuels and the required raw materials for the reaction are oil (triglycerides), alcohol and catalyst. In this work, travertine stone powder (as waste in the manufacture of building materials) was used as a catalyst and waste frying oil as a source of triglyceride for biodiesel production. Using thermogravimetric and X-ray diffraction analysis, optimum temperature for catalyst calcination was selected at 900°C. Furthermore, X-ray fluorescence, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, transmission electron microscopy and scanning electron microscopy analyses were performed. Using the design of experiments Response Surface Methodology, the optimum reaction conditions for biodiesel production yield of 97.74% were: reaction temperature 59.52°C (~60°C), time 3.8 h (228 min), catalyst concentration 1.36 wt.% and the methanol to oil molar ratio of 11:6. After reusing four times, the catalyst efficiency was reduced a little, and the biodiesel yield was 89.84%, indicating high strength and stability of the catalyst.

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“…Chemical analysis of the BE-ZnO NPs using EDS and XPS confirmed the presence Zn, O, and C (Table S1 and Figure S2a). A detailed XPS analysis of Zn 2p (Figure 1d) show energies of 1021.8 and 1044.9 eV for BE-ZnO8 and 1021.7 and 1044.7 eV for BE-ZnO12, co firming the exclusive presence of ZnO [33][34][35]. These energies are attributed to Zn 2p1 and Zn 2p3/2 [34], indicating that Zn exists in the form of Zn(II) in both NPs [34].…”

Section: Physicochemical Properties Of "Bravo De Esmolfe" Phytonanoca...mentioning

confidence: 88%

Antibacterial Activity of ZnO Nanoparticles in a Staphylococcus-aureus-Infected Galleria mellonella Model Is Tuned by Different Apple-Derived Phytocargos

Santos,

Andrade,

Mil-Homens

et al. 2023

JFB

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This research investigates pH changes during the green synthesis of ZnO nanoparticles (NPs) and emphasises its importance in their physicochemical, antibacterial, and biological properties. Varying the synthesis pH from 8 to 12 using “Bravo de Esmolfe” apple extracts neither affected the morphology nor crystallinity of ZnO but impacted NP phytochemical loads. This difference is because alkaline hydrolysis of phytochemicals occurred with increasing pH, resulting in BE-ZnO with distinct phytocargos. To determine the toxicity of BE-ZnO NPs, Galleria mellonella was used as an alternative to non-rodent models. These assays showed no adverse effects on larvae up to a concentration of 200 mg/kg and that NPs excess was relieved by faeces and silk fibres. This was evaluated by utilising fluorescence-lifetime imaging microscopy (FLIM) to track NPs’ intrinsic fluorescence. The antibacterial efficacy against Staphylococcus aureus was higher for BE-ZnO12 than for BE-ZnO8; however, a different trend was attained in an in vivo infection model. This result may be related to NPs’ residence in larvae haemocytes, modulated by their phytocargos. This research demonstrates, for the first time, the potential of green synthesis to modulate the biosafety and antibacterial activity of NPs in an advanced G. mellonella infection model. These findings support future strategies to overcome antimicrobial resistance by utilizing distinct phytocargos to modulate NPs’ action over time.

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Understanding the Correlation of Crystal Atoms with Photochemistry Property: Zn₅(OH)₆(CO₃)₂vs. ZnCO₃

Cited by 22 publications

References 36 publications

Operando Characterization of Copper–Zinc–Alumina Catalyst for Methanol Synthesis from Carbon Dioxide and Hydrogen by Ambient-Pressure Hard X-ray Photoelectron Spectroscopy

Operando Characterization of Copper–Zinc–Alumina Catalyst for Methanol Synthesis from Carbon Dioxide and Hydrogen by Ambient-Pressure Hard X-ray Photoelectron Spectroscopy

Low-cost biodiesel production using waste oil and catalyst

Antibacterial Activity of ZnO Nanoparticles in a Staphylococcus-aureus-Infected Galleria mellonella Model Is Tuned by Different Apple-Derived Phytocargos

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