Journal of Cleaner Production
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2019
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IF 6.395
Yi Wan,Ze-Yu Liu,Peng Song,Xiao-Qi Zhang,Jiang-Chao Song,Yu-Jie Fu,Xiao-Hui Yao,Jun Wang,Tao Chen,Dong-Yang Zhang,Long Li,Can-Yang Shi
In this study, a three-dimensional porous cellulose-based microsphere material modified with ionic liquid functional groups was prepared. Seven kinds of cellulose microspheres with different ionic liquid groups were successfully produced and were used for the adsorption of Acid Orange 7 dye. Cellulose microsphere modified with 4-methylimidazole, named as CMs4, had the greatest adsorption capacity of 218.6 mg/g and the fastest adsorption rate. CMs4 reached an adsorption capacity of 100 mg/g after only 10 min. Compared with materials in other literatures, CMs4 had an excellent Acid Orange 7 dye adsorption rate. According to the zeta potential analysis, the surface potential of CMs4 depended on the pH. Exploiting this property, cationic and anionic dyes can be separated using CMs4 by changing the pH. Since cellulose materials are renewable and widely available, CMs4 is a promising environmentally friendly material for dye adsorption applications.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Rui Gao,Shan Gao,Ping Wang,Yingming Xu,Xianfa Zhang,Xiaoli Cheng,Xin Zhou,Zoltán Major,Hanyue Zhu,Lihua Huo
Ionic liquid [Bmim][BF 4 ] is used as a templating agent to synthesize ZnO with snowflake morphology by hydrothermal method. Different calcination temperatures make snowflake ZnO retain different content of ionic liquid residual which results in different gas response. The mesoporous ZnO material obtained after calcination at 650 °C shows the best gas response to NO x . The sensor not only has excellent gas selectivity, but also exhibits an optimal response to NO x (S = 73.4) at 170 °C with a response range of 0.05 ∼ 10 ppm. In addition, the sensor has good repeatability and long-term stability and also exhibits good moisture resistance at different humidity levels which may be attributed to an appropriate amount of residual ionic liquid after high temperature calcination. The reaction mechanism of the sensor to NO x is also discussed in detail based on XPS analysis, GC–MS measurement and DFT calculations.
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FUSION ENGINEERING AND DESIGN
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2019
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IF 1.457
Huaxin Sun,Yongzhong Jia,Bing Liu,Yan Jing,Quanyou Zhang,Fei Shao,Ying Yao
A solvent extraction system was selected to separate lithium isotopes by using 1-Ethyl-3-methyl-imidazolium-bis(trifluoromethysulfonyl)-imide ([EMIm][NTf 2 ]) as extraction solvent, Dibenzo-15-crown-5 (DB15C5) as extracting agent and a traditional organic solvent as diluent. The effect of kinds of diluent, the content of ionic liquid in organic solvent, extraction time, extractant concentration and counter anions of lithium salt on the separation of lithium isotopes was studied. The single-stage separation factor α can reach up to 1.031 ± 0.001 and the abundance of the light isotope 6 Li in organic phase can reach 7.76%. The exchange mechanism between the lithium salt and the ionic liquid is cation exchange. Lithium ions and ionic liquid cations are 1:1 exchange in the extraction system. Multistage experiment for separation of lithium isotope was also developed for enrichment of 6 Li as much as possible. The abundance of 6 Li in organic phase can reach 7.80% after 5 stages extraction experiment. Lithium of organic phase was stripped into the aqueous phase by 1 mol L −1 HCl solution.
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JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Sihan Tang,Zhiyue Dong,Xiangwei Zhu,Qiang Zhao
Advanced membranes for pervaporation dehydration of acidic mixtures are demanded since the membrane swelling and stability in acidic feed differ from that in neutral feed. Herein we exploited poly(ionic liquid) complex (PILC) membranes featuring high dehydration performance in acidic conditions versus feed temperature and operation time. A poly(ionic liquid), i.e., poly[1-cyanomethyl-3-vinylimidazolium bromide] (PCMVImBr), was synthesized and complexed with sodium carboxymethyl cellulose (CMCNa) to prepare membranes. Chemical structures , compositions, microstructures and surface properties of PCMVIm-CMCNa PILC membranes were characterized by Fourier-transform infrared spectroscopy, element analysis , scanning electron microscopy, atomic force microscopy and water contact angle. The PILC membranes were efficient in dehydrating 10 wt% acidic water-isopropanol mixtures. Water in permeate for PILC membranes was maintained 99.5 ± 0.3 wt% (feed pH: 7–1, feed temperature: 70 °C), in stark contrast to the pristine CMCNa membrane whose separation factor declined significantly from 1791 to 91.
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ChemPlusChem
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2019
·Vol. 84
·期 3
·281-288
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IF 3.441
Na Li,Rong Qu,Xiaoyu Han,Weiran Lin,Haining Zhang,Zhenyu J. Zhang
Graphical Solitary confinement : The confined structure of poly(ionic liquid)s (PILs) attached to the surfaces of silica nanoparticles can facilitate carbon dioxide transport and thus enhance its adsorption. The carbon dioxide adsorption properties are strongly dependent on the type of counterion associated with the anchored molecules. Imidazolium-based poly(ionic liquid) brushes were attached to spherical silica nanoparticles bearing various functionalities by using a surface-initiated atom transfer radical polymerization (“grafting from” technique). A temperature-programmed desorption process was applied to evaluate and analyze the carbon dioxide adsorption performance of the synthesized polymer brushes. The confined structure of the surface-attached polymer chains facilitates gas transport and adsorption, leading to an enhanced adsorption capacity of carbon dioxide molecules compared with pure polymer powders. Temperature-programmed desorption profiles of the synthesized polymer brushes after carbon dioxide adsorption reveal that the substituent groups on the nitrogen atom at the 3-position of the imidazole ring, as well as the associated anions significantly affect the adsorption capacity of functionalized poly(ionic liquid) brushes. Of the tested samples, amine-functionalized poly(ionic liquid) brushes associated with hexafluorophosphate ions exhibit the highest carbon dioxide adsorption capacity of 2.56 mmol g −1 (112.64 mg g −1 ) at 25 °C under a carbon dioxide partial pressure of 0.2 bar.
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GREEN CHEMISTRY
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2019
·Vol. 21
·期 10
·2699-2708
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IF 9.405
Xiaoqian Li,Xingmei Lu,Jiming Yang,Zhaoyang Ju,Ying Kang,Junli Xu,Suojiang Zhang
Aerogels derived from corn stalks are promising materials for wide use, due to their biodegradability and biocompatibility. However, preparation of cellulose-rich aerogels directly from corn stalks is a tedious and complicated process. In this study, generation of cellulose-rich aerogels was achieved by a facile approach relying on an ionic liquid and amido-sulfonic acid used as solvents. By this method, cellulose-rich aerogels were directly obtained from corn stalks through a process whereby lignin was separated from the other components of the corn stalks in one step, an approach simplifying the traditional fabrication processes. The composition, morphology and thermal stability of the obtained aerogels were investigated as they were related to the ionic liquid solvent systems used. Furthermore, the dye adsorption mechanism of cellulose-rich aerogels was simulated. In the most favourable case, the obtained aerogel was free of lignin and had the cellulose content as high as 88.1%. In addition, the aerogel possessed a porous three-dimensional structure with a high specific area (201 m2 g−1) and good thermal stability. Owing to its excellent properties, this cellulose-rich porous aerogel is expected to have a potential use in dye adsorption and other fields. This aerogel displayed an absorption capacity of 549 mg g−1 for Congo red and 302 mg g−1 for Coomassie brilliant blue.
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SENSORS
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2019
·Vol. 19
·期 3
·640
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IF 3.031
Meng Li,Jing Wu,Haiping Su,Yan Tu,Yazhuo Shang,Yifan He,Honglai Liu
In this work, three different aqueous solutions containing imidazole-based ILs with different alkyl chain lengths ([Cnmim]Br,n= 2, 6, 12) were adopted as the medium for the synthesis of ionic liquid-polypyrrole (IL-PPy) composites. Herein, the ILs undertook the roles of the pyrrole solvent, the media for emulsion polymerization of PPy and PPy dopants, respectively. The electrochemical performances of the three IL-PPy composites on a glassy carbon electrode (GCE) were investigated by electrochemical experiments, which indicated that [C12mim]Br-PPy (C12-PPy) composites displayed better electrochemical performance due to their larger surface area and firmer immobilization on the GCE. Further, C12-PPy/GCE were decorated with Au microparticles by electrodeposition that can not only increase the conductivity, but also immobilize sufficient biomolecules on the electrode. Then, the obtained C12-PPy-Au/GCE with outstanding electrochemical performance was employed as a horseradish peroxidase (HRP) immobilization platform to fabricate a novel C12-PPy-Au-HRP/GCE biosensor for H2O2detection. The results showed that the prepared C12-PPy-Au-HRP/GCE biosensor exhibited high sensitivity, fast response, and a wide detection range as well as low detection limit towards H2O2. This work not only provides an outstanding biomolecule immobilization matrix for the fabrication of highly sensitive biosensors, but also advances the understanding of the roles of ILs in improving the electrochemical performance of biosensors.Keywords:ionic liquids (ILs);polypyrrole (PPy);gold particles;horseradish peroxidase (HRP);enzyme immobilization;hydrogen peroxide sensor
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ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Xiaomin Zhang,Wenjie Xiong,Zhuoheng Tu,Lingling Peng,Youting Wu,Xingbang Hu
Selective separation of CO2 from flue gas conforms to the criterion of sustainable society. Herein, a series of imidazolium-based phenolate ionic liquids (ILs) that have dual-site interaction centers to isolate CO2 from N2 by supported ionic liquid membranes (SILMs) is designed and prepared. Density, viscosity, and CO2 solubility in these ILs were measured. The effects of the electron-withdrawing or electron-donating ability of the substituents on the anion, the operation temperature and partial pressure on the permeability of CO2, and the ideal selectivity of CO2/N2 were investigated systematically. High permeability (up to 2540 barrers) and selectivity of CO2/N2 (up to 127) are achieved in 1-butyl-3-methylimidazolium phenolate ([bmim][PhO]) containing 15 wt % H2O under humidified condition. A novel facilitated transport mechanism, transfer of CO2 from carbene to phenolated anion, is proposed based on NMR, FT-IR, and theoretical calculation results. The new pathway is believed to offer an alternative opportunity for designing novel CO2 separation materials.
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Journal of Materials Chemistry B
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2019
·Vol. 7
·期 36
·5520-5527
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IF 5.047
Lunqiang Jin,Zhenqiang Shi,Xiang Zhang,Xiaoling Liu,Huiling Li,Jingxia Wang,Feng Liang,Weifeng Zhao,Changsheng Zhao
The prevention of bacteria-induced infections has been increasing in importance in both clinical surgery and biomedical engineering. Although great attention has been paid to designing intelligent antibacterial surfaces, the fabrication processes are still not facile and universal enough, and the antibacterial efficiencies of these surfaces are also not ideal. Herein, ionic liquid (IL) molecules of 3-(12-mercaptododecyl)-1-methyl-1H-imidazol-3-ium bromide (IL(Br)) were synthesized with the minimum inhibitory concentrations as low as 4 and 8 μg mL−1 against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), respectively. By simply immersing a polymeric substrate into the IL(Br) solution, an antibacterial surface with high killing efficiency of 99% against S. aureus (94% against E. coli) was achieved via a mussel-inspired approach. Subsequently, 97% S. aureus and 95% E. coli on the substrate could be released by simple ion-exchange of Br− with (CF3SO2)2N− due to the ion sensitivity of the IL molecular brushes. Thus, the proposed facile strategy towards a superior efficiency surface could be potentially used in intelligent antibacterial fields.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Ning Wang,Qi Wang,Wenjuan Lu,Miaoyan Ru,Yanzhao Yang
The extraction and stripping behaviors of Pt(IV) from acidic chloride media by 2,2-diheptyl-1,1,3,3-tetramethylguanidinium bromide were investigated. The extraction of Pt(IV) was carried out by modulating various parameters such as concentration of the extractant, temperature, and concentration of HCl solution. Based on the characterization of experimental results such as Job's method data, UV–vis spectra and fourier transform infrared spectra analysis, the anion exchange mechanism was confirmed. Quantum chemical calculations were performed to provide theoretical support for the mechanism. The ionic liquid showed outstanding selectivity for Pt(IV) over the base metals. Furthermore, the organic phase could be easily used for four extraction-stripping cycles by reductive stripping process using 0.5 M CS(NH 2 ) 2 /0.5 M HCl. The numbers of theoretical stages needed for the effective extraction and stripping of Pt(IV) has been determined by McCabe Thiele's diagram. Under the selected counter-current extraction and stripping stages, the extraction efficiency and stripping efficiency could reach 99.5% and 99.0%, respectively. Therefore, the system is highly effective, selective and recyclable to extract Pt(IV). On the basis of the extraction protocol, the system may be a promising candidate for highly selective extraction of Pt(IV).
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TALANTA
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2019
·
IF 4.916
Wei Zhou,Wenqi Sun,Yikun Liu,Zhenkun Mao,Zilin Chen
Developing novel capillary electrochromatography (CEC) column with high separation efficiency and capacity is an essential work in CEC. In this work, porous layer open tubular (PLOT) column has been developed by co-polymerization of quaternary ammonium typed ionic liquid (IL), 1-allyl-methylimidazolium chloride (AlMeIm + Cl − ) with styrene (IL-styrene) and ethylene dimethacrylate (EDMA) for CEC-MS analysis. The PLOT-CEC column possesses high separation efficiency and capacity while keeping the inherent advantages of open tubular (OT) column unaltered, which is suitable for CEC analysis. Due to the uniform branch-like structure with large specific surface area, the IL-styrene based PLOT-CEC column showed excellent separation efficiency towards multiple kinds of analytes with theoretical plates up to N = 322,277 N/m for phloroglucinol . And thanks to the high permeability and large EOF mobility generated by positively charged ionic liquid, the PLOT-CEC column showed good performance in CEC-MS analysis of parabens , amino acids and peptides with stable separation and ESI spray . Good repeatability with relative standard deviations for intra-day, inter-day runs and between tubes less than 4.94% was obtained.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Xiyu Zang,Mingfeng Chang,Lan Zheng,Yingying Zhou,Yuqi Wang,Jiahao Ren,Le Wu,Xiaolong Han,Qian Wang,Jinqiao Wu
Three novel quaternary ammonium based poly(ionic liquid)s (PILs) were prepared and developed, expecting to increase the viscosity of liquid CO 2 (LCO 2 ). The Vinyl benzoate and various quaternary ammonium salts was used to provide CO 2 -philicity group and viscosity-increasing groups respectively. And the PILs products (TDBAS, HDBAS and SDBAS) were synthesized with three processes consisting of polymerization, sulfonation and ion exchange. The characterization results of gel permeation chromatography (GPC), nuclear magnetic resonance spectrum (NMR), fourier transform infrared spectrometer (FT-IR), element analysis (EA) and thermogravimetric analysis (TGA) confirmed the successful synthesis of the PILs. Based on the discussion of reverse micelle microstructures and interfacial tension of prepared PILs systems, the viscosity-increasing mechanisms of the prepared PILs were analyzed and explicated. The experimental results indicated that the HDBAS presented an outstanding viscosity-increasing effect and acceptable water solubility among all the PILs, which may have a prosperous prospect in the near future.
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