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Xian‐Juan Meng

Bio: Xian‐Juan Meng is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Materials science & Chemistry. The author has co-authored 1 publications.

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TL;DR: In this paper, the quenching processes of the excited singlet state of pyrene by triphenylamine, diphenylamines and N,N-dibenzylaniline in various solvents at room and lower temperature have been studied with both static state fluorescence spectroscopy and fluorescence lifetime techniques.
Abstract: The quenching processes of the excited singlet state of pyrene by triphenylamine, diphenylamine and N,N-dibenzylaniline in various solvents at room and lower temperature have been studied with both static state fluorescence spectroscopy and fluorescence lifetime techniques. On the basis of experimental data, a preliminary quenching mechanism has been discussed. The geometrical configuration models of the exciplexes formed between the excited pyrene and aromatic amines in nonpolar solvents were proposed.
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TL;DR: In this article , the antimicrobial potency of imidazole chloride ILs (CnMIMCl) on Staphylococcus aureus (S. anaphylaxis) was evaluated.
Abstract: Ionic liquids (ILs) have garnered increasing attention in the biomedical field due to their unique properties. Although significant research has been conducted in recent years, there is still a lack of understanding of the potential applications of ILs in the biomedical field and the underlying principles. To identify the antibacterial activity and mechanism of ILs on bacteria, we evaluated the antimicrobial potency of imidazole chloride ILs (CnMIMCl) on Staphylococcus aureus (S. aureus). The toxicity of ILs was positively correlated to the length of the imidazolidinyl side chain. We selected C12MIMCl to study the mechanism of S. aureus. Through the simultaneous change in the internal and external parts of S. aureus, C12MIMCl caused the death of the bacteria. The production of large amounts of reactive oxygen species (ROS) within the internal parts stimulated oxidative stress, inhibited bacterial metabolism, and led to bacterial death. The external cell membrane could be destroyed, causing the cytoplasm to flow out and the whole cell to be fragmented. The antibacterial effect of C12MIMCl on skin abscesses was further verified in vivo in mice.
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TL;DR: In this paper , an easily prepared catalyst-loaded Au on NiO-decorated MgO-Al2O3 was reported, which resulted in 97.7% MAL conversion and 91.9% MMA selectivity.
Abstract: Supported Au catalysts have been the focus of oxidation esterification of methylacrolein (MAL) to methyl methacrylate (MMA) in recent years, but most of them have difficulty in achieving both high conversion and high selectivity. Here, we report an easily prepared catalyst-loaded Au on NiO-decorated MgO–Al2O3, using which resulted in 97.7% MAL conversion and 91.9% MMA selectivity. XPS showed that Au existed mainly as Au0, while Ni existed as NiO. The addition of appropriate amounts of Ni reduced the binding energy of Au and the percentage of Auδ+ and enhanced the interaction between Au and the support, so as to obtain high reaction activity. In situ FTIR showed that the high selectivity for MMA formation was attributed to a special η1-(C,O) mode. Furthermore, the mechanism of the reaction was deduced from the above experimental results and different adsorption modes. We anticipate that the results provide ideas for the design of oxidation esterification catalysts.

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TL;DR: In this article , a combination of precipitation and solvent extraction was used to study the separation and recovery of nickel, cobalt, manganese and lithium from the acid leach solution of wasted ternary lithium-ion battery cathode materials.

2 citations

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TL;DR: In this paper , MoSi2-modified LiNi0.6Co0.3O2 (NCM-0.5MoSi2) was applied to LiNi 0.1Mn 0.5Co 0.
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TL;DR: In this paper , the effects of NaOH concentration, liquid-solid ratio, dissolution temperature, and time on the traditional NaOH dissolving pretreatment process were systematically studied, and a green and facile ultrasonic-assisted-enhanced dissolving pre-treatment method was proposed.
Abstract: ABSTRACT It is always a challenge to separate cathode materials and aluminum foil collector efficiently in the pretreatment process of spent lithium-ion batteries (LIBs) recycling. In this work, the effects of NaOH concentration, liquid-solid ratio, dissolution temperature, and time on the traditional NaOH dissolving pretreatment process were systematically studied. Under the optimal conditions, the traditional dissolving process shows a limited aluminum dissolution rate of 83.59%. Through characterization and thermodynamic analysis, the fact that the traditional dissolving process results in the dissolution loss of lithium (5.5%) has been proved. The lost lithium may come from the free lithium ion and SEI layer on the cathode surface. Furthermore, a green and facile ultrasonic-assisted-enhanced dissolving pretreatment method was proposed. The dissolution rate of aluminum increases from 83.59% to 94.8% under the optimal conditions of NaOH concentration of 10 wt%, liquid-solid ratio of 10:1 ml/g, dissolution temperature of 30°C, dissolution time of 60 min and ultrasonic power of 288 W. Due to the mechanical and cavitation effects of ultrasonic, the efficient separation of cathode materials and aluminum foil and the decomposition of binder PVDF are completed in one step, which reduces energy consumption and avoids HF gas emissions. GRAPHICAL ABSTRACT