Nature Communications
·
2021
·Vol. 12
·期 1
·1-12
·
IF 14.919
Han Cuiping,Li Hongfei,Li Yu,Zhu Jiaxiong,Zhi Chunyi
Rechargeable calcium-ion batteries are intriguing alternatives for use as post-lithium-ion batteries. However, the high charge density of divalent Ca 2+ establishes a strong electrostatic interaction with the hosting lattice, which results in low-capacity Ca-ion storage. The ionic radius of Ca 2+ further leads to sluggish ionic diffusion, hindering high-rate capability performances. Here, we report 5,7,12,14-pentacenetetrone (PT) as an organic crystal electrode active material for aqueous Ca-ion storage. The weak π-π stacked layers of the PT molecules render a flexible and robust structure suitable for Ca-ion storage. In addition, the channels within the PT crystal provide efficient pathways for fast ionic diffusion. The PT anode exhibits large specific capacity (150.5 mAh g -1 at 5 A g -1 ), high-rate capability (86.1 mAh g -1 at 100 A g -1 ) and favorable low-temperature performances. A mechanistic study identifies proton-assisted uptake/removal of Ca 2+ in PT during cycling. First principle calculations suggest that the Ca ions tend to stay in the interstitial space of the PT channels and are stabilized by carbonyls from adjacent PT molecules. Finally, pairing with a high-voltage positive electrode, a full aqueous Ca-ion cell is assembled and tested.
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Frontiers of Environmental Science & Engineering
·
2021
·Vol. 16
·期 8
·1-10
·
IF 4.357
Shen Zhichao,Zhan Lu,Xu Zhenming
Current study proposes a green regeneration method of activated carbon (AC) laden with Perfluorochemicals (PFCs) from the perspective of environmental safety and resource regeneration. The defluorination efficiencies of AC adsorbed perfluorooctanesulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutanesulfonate (PFBS) using three molten sodium salts and one molten alkali were compared. Results showed that defluorination efficiencies of molten NaOH for the three PFCs were higher than the other three molten sodium salts at lower temperature. At 700°C, the defluorination efficiencies of PFOS and PFBS using molten NaOH reached to 84.2% and 79.2%, respectively, while the defluorination efficiency of PFOA was 35.3%. In addition, the temperature of molten salt, the holding time and the ratio of salt to carbon were directly proportional to the defluorination efficiency. The low defluorination efficiency of PFOA was due to the low thermal stability of PFOA, which made it difficult to be captured by molten salt. The weight loss range of PFOA was 75°C–125°C, which was much lower than PFOS and PFBS (400°C–500°C). From the perspective of gas production, fluorine-containing gases produced from molten NaOH-treated AC were significantly reduced, which means that environmental risks were significantly reduced. After molten NaOH treatment, the regenerated AC had higher adsorption capacity than that of pre-treated AC.
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IONICS
·
2019
·Vol. 26
·期 1
·449-456
·
IF 2.289
Zheng Li,Zhang Wen,Guo Jun
A modified electrode Ni(II)–ARS/GR/CPE has been fabricated by electrodepositing nickel(II)–alizarin red complex on the surface of graphene-modified carbon paste electrode (GR/CPE) in alkaline solution. The modified electrode is characterized by scanning electron microscopy, Fourier transform infrared spectrometry, x-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. It exhibits the characteristic of improved reversibility and enhanced current responses of the Ni(III)/Ni(II) couple compared with Ni(II)–ARS/CPE. It also shows enhanced electrocatalytic activity toward the oxidation of formamide, which is due to the high surface area and facile charge–transfer ability of graphene and Ni(II)–ARS complex. The mechanisms of film formation and the catalytic process are also discussed. Moreover, the catalytic currents present linear dependence on the concentration of formamide from 0.5 mM to 0.21 M by amperometry; the detection limit is 0.15 mM. The modified electrode for formamide determination is of the property of simple preparation, good stability, fast response, and acceptable sensitivity.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 31
·31250-31261
·
IF 2.8
Wang Liang,Xie Yingjuan,Liu Wenxiu,Wang Qi,Cao Wenbin
TiO 2 microstructures were synthesized via a facile one-step route for enhanced intrinsic photocatalytic performance. The prepared TiO 2 microstructures are featured by both mesoporous core-shell structures and coexposed {001}/{101} facets. Their intrinsic photocatalytic performance were remarkably enhanced due to their high specific surface area, coexposed {001}/{101} facets, and promoted separation of photogenerated carriers. Furthermore, the origin and detailed mechanism for diethylenetriamine (DETA) that served as a high efficient stabilizer of TiO 2 {001} facet have been theoretically investigated. Finally, a new DETA-modified Ostwald ripening mechanism was originally proposed when studying the growth mechanism of the mesoporous core-shell TiO 2 spherical microstructures with coexposed {001}/{101} facets.
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2011
·Vol. 5
·期 4
·409-415
·
IF 0
Cao Hongfei,Feng Yakai,Wang Heyun,Zhang Li,Khan Musammir,Guo Jintang
By using the corresponding L -amino acid sodium as initiator, ɛ -caprolactone-depsipeptides CL-Ala and CL-Leu were prepared by the reactions of ɛ -caprolactone (CL) with L -alanine and L -leucine, respectively, and p -dioxanone-depsipeptide (PDO-Leu) was prepared by the reaction of p -dioxanone (PDO) with L leucine. Two poly( ɛ -caprolactone) oligomers (PCL-Ala and PCL-Leu) of different molecular weights with depsipeptide unit were synthesized by controlling the feed ratio of L -amino acid sodium and CL. The presence of the depsipeptide structure in these obtained products was confirmed by 1 H NMR spectra and the molecular weight of the poly( ɛ -caprolactone) oligomers was measured by gel permeation chromatography (GPC). These products contain a hydroxyl group and a carboxyl group in one molecule, which means they could act as bifunctional monomers for further polymerization to prepare high molecular weight polymers. By this way, the depsipeptide unit could be introduced into the polymers and the biodegradation rates of the novel polymers could be well controlled in vivo by the tailored molecular structures.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 5
·2747-2761
·
IF 2.87
Ren Xu,Hao Jie,Guo Lingli,Sathishkumar Gnanasekar,Xu Liqun
The persistence of bacterial infections in humans causes severe adverse health consequences and uncertainties in the global economy. It is of great advantage to develop a rapid tool for the earlier diagnosis and treatment of pathogenic infections. In this work, an active polythiophene derivative containing reactive pentafluorophenyl (PFP) ester groups was prepared via Fe 3+ -catalyzed oxidative polymerization using PFP thiophene-3-acetate as the monomer. The active polythiophene derivative was conjugated with N , N -dimethyl-1,3-propanediamine via ester-amine reaction, followed by quaternization with 1-bromobutane. The resultant polythiophene derivative (QPDMAPTA) possesses the quaternary ammonium salt groups on its side chain and shows cationic zeta potential of + 12.79 eV at neutral pH. The as-prepared QPDMAPTA exhibits high-level antibacterial action against gram-positive bacteria ( Staphylococcus aureus ( S. aureus ), Staphylococcus epidermidis ( S. epidermidis ), and methicillin-resistant S. aureus ) as compared with gram-negative bacteria ( Escherichia coli ( E. coli ) and Pseudomonas aeruginosa ( P . aeruginosa )). Furthermore, the zeta potential measurements show higher uptake of QPDMAPTA by gram-positive bacteria than the gram-negative bacteria, which depicts the active role of the biological interactions with the charged QPDMAPTA in its differential uptake and bactericidal effect. This phenomenon also facilitates the identification of gram-positive bacteria by observing the color changes of collected bacterial cakes before and after treatment with QPDMAPTA. The fluorescent nature of QPDMAPTA can be used for imaging and detection of gram-positive bacteria via adopting a fluorescent technique.
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BULLETIN OF MATHEMATICAL BIOLOGY
·
2023
·Vol. 85
·期 10
·1-27
·
IF 3.5
Wang Mengshou,Li Gao,Peng Liangrong,Hong Liu
Epigallocatechin-3-gallate, as a representative amyloid inhibitors, has shown a promising ability against A \(\beta \) fibrillation by directly degradating the mature fibrils. Most previous studies have been focusing on its functional mechanisms, meanwhile its optimal dosage has been seldom considered. To solve this critical issue, we refer to the generalized Logistic model for amyloid fibrillation and inhibition and adopt the optimal control theory to balance the effectiveness and cost (or toxicity) of inhibitors. The optimal control trajectory of inhibitors is analytically solved, based on which the influence of model parameters, the difference between the optimal control strategy and several other traditional drug dosing strategies are systematically compared and validated through experiments. It is found that the strategy of multiple-times adding is more suitable for a long-term disease treatment, while single high-dose therapy is preferred for a short-term treatment. We hope our findings can shed light on the rational usage of amyloid inhibitors in clinic.
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PubMed
高影响因子
MOLECULAR DIVERSITY
·
2018
·Vol. 23
·期 2
·299-306
·
IF 2.229
Lv Xian-Hai,Liu Hao,Ren Zi-Li,Wang Wei,Tang Feng,Cao Hai-Qun
Abstract A series of novel Mannich base derivatives of flavone containing benzylamine moiety was synthesized using the Mannich reaction. The results of antifungal activity are not ideal, but its antifungal effect has a certain increase compared to flavonoids. After that, four bacteria were used to test antibacterial experiments of these compounds; compound 5g (MIC = 0.5, 0.125 mg/L) showed significant inhibitory activity against Staphylococcus aureus and Salmonella gallinarum compared with novobiocin (MIC = 2, 0.25 mg/L). Compound 5s exhibited broad spectrum antibacterial activity (MIC = 1, 0.5, 2, 0.05 mg/L) against four bacteria. The selected compounds 5g and 5s exhibit potent inhibition against Topo II and Topo IV with IC 50 values (0.25–16 mg/L). Molecular docking model showed that the compounds 5g and 5s can bind well to the target by interacting with amino acid residues. It will provide some valuable information for the commercial antibacterial agents. Graphical Abstract
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PubMed
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 7
·2107-2114
·
IF 2.936
Zhao Wenli,Niu Xiaopo,Liu Guangni,Zhang Xiurong,Wang Qingfa
Three kinds of Pt nanocrystals with different morphologies (5 nm cubes, 10 nm cubes and 5 nm truncated octahedrons) were synthesized and employed to fabricate Pt/CNT-USY catalysts for selective ring opening of decalin. The 5 nm truncated octahedral Pt/CNT-USY with exposed (100) and (111) facets exhibited higher yield of ring-opening products (53.9 wt%) than the CNT-USY-supported 5 nm cubic Pt catalyst enclosed by the (100) facets (39.6 wt%). Moreover, the 5 nm cubic Pt showed better catalytic activities compared to the 10 nm cubic Pt/CNT-UST catalyst, which ascribed to the smaller size of Pt NCs enriched more revealable metal active sites. DFT calculations demonstrated that the adsorption of decalin on Pt (111) was stronger than that on Pt (100) facets, which was profitable for the selective ring-opening reaction. Graphical Abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 3
·1-12
·
IF 2.132
Ma Wenzhong,Li Taiyu,Zhang Qi,Zhong Jing,Matsuyama Hideto
Hydrophilic UiO-66 crystals with superior water adsorption ability were synthesized and incorporated into the polyimide (PI) membrane for efficient aprotic solvent separation via pervaporation. The effect of the different UiO-66 addition in the pyromellitic dianhydride (PMDA)-2, 2-bis[4-(4-amlnophenoxy)phenyl]propane (BAPP)-based PI membrane on the membrane structure, thermal stability, surface hydrophilicity, solvent-resistant, and pervaporation performance was systematically studied. The UiO-66/PI hybrid membranes with small amount content (2 wt%) exhibited high hydrophilicity and excellent swelling resistance due to the superb dispersion benefiting from the excellent complexation of UiO-66 and PI chain. The effects of operational variables such as operating temperature and concentration of feed solution on the pervaporation separation performance of the hybrid membranes with different UiO-66 loadings were investigated. When the mass fraction of UiO-66 was 2 wt%, the hybrid membranes show the permeation flux of 109.7 and 57.1 g/(m 2 h) and separation factor of 34.1 and 133.9, respectively, for DMF/H 2 O and DMAc/H 2 O systems.
Graphical abstract
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-11
·
IF 3.998
Zhou You,Qin De Qiang,Zhang Pei Wen,Chen Xiao Tian,Liu Ben Ju,Cheng Dong Mei,Zhang Zhi Xiang
Azadirachtin exhibits excellent bioactivities against several hundred arthropods. However, current knowlege of its biochemical effect on B . dorsalis larvae is not deep enough. In this study, integrated LC-MS and GC-MS-based untargeted metabolomics were used to analyze the changes of endogenous metabolites and the biochemical effects of azadirachtin on B . dorsalis larvae. Azadirachtin has excellent bioactivities against B . dorsalis larvae in this study, leading to a longer developmental duration, lower survival rate, and low pupa weight. The effect of azadirachtin was investigated on a total of 22 and 13 differentially abundant metabolites in the LC–MS and GC–MS-based metabolomics results, are selected respectively. Pathway analysis indicated that 14 differentially enriched metabolic pathways, including seven influential pathways, are worthy of attention. Further integrated key metabolic pathway analysis showed that histidine metabolism, d -glutamine and d -glutamate metabolism, biotin metabolism, ascorbate and aldarate metabolism, pentose and glucuronate interconversions, and alanine, aspartate and glutamate metabolism in B . dorsalis larvae are significantly relevant pathways affected by azadirachtin. Although extrapolating the bioactivity results in this study to the practical project of B . dorsalis pest management in the field has limitations, it was found that azadirachtin has a significant effect on the primary metabolism of B . dorsalis larvae.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 10
·10336-10341
·
IF 1.798
Wu Shuang,Liu Pei,Lai Yuanming,Guan Weiming,Huang Zihan,Han Jiao,Xiang Yao,Yi Wei,Zeng Yiming
The Ba 2+ doped ceramics of Ca 1−x Ba x Cu 3 Ti 4 O 12 (x = 0.005, 0.01, 0.03, 0.05 and 0.1) were sintered via conventional solid-state reaction at 1050 °C for 8 h in air. The microstructure and electric properties of Ba 2+ doping ceramics were investigated. The lattice parameters of Ca 1−x Ba x Cu 3 Ti 4 O 12 (CBCTO) ceramics decreased with the Ba 2+ doping, and Ba 1.31 Ti 8 O 16 as secondary phase was confirmed at x = 0.1. The doping of Ba 2+ resulted in uniformly distribution of small size grain (~4 μm). All the doped samples showed lower value of dielectric constant than CaCu 3 Ti 4 O 12 (CCTO), due to low resistivity of the grain boundary with the Ba 2+ doped samples. The nonlinear coefficient and breakdown field were significantly enhanced by Ba 2+ doping.
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