ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 22
·1700653
·
IF 12.124
Jia Yan,Marco-Tulio F. Rodrigues,Zhilong Song,Hongping Li,Hui Xu,Huan Liu,Jingjie Wu,Yuanguo Xu,Yanhua Song,Yang Liu,Peng Yu,Wei Yang,Robert Vajtai,Huaming Li,Shouqi Yuan,Pulickel M. Ajayan
Many unique properties arise when the 3D stacking of layered materials is disrupted, originating nanostructures. Stabilization, and further reorganization of these individual layers into complex 3D structures, can be essential to allow these properties to persist in macroscopic systems. It is demonstrated that a simple hydrothermal process, assisted by ionic liquids (ILs), can convert bulk g-C 3 N 4 into a stable hydrogel. The gelation occurs through delamination of the layered structure, driven by particular interactions between the IL and the carbon nitride sheets, forming an amphiphilic foam-like network. This study employs spectroscopic and computational tools to unravel the gelation mechanism, and provides a rational approach toward the stabilization of 2D materials in hydrogels. The solution-processable hydrogels can also be used as building blocks of complex devices. Chemiresistive gas sensors employing g-C 3 N 4 3D hydrogels exhibit superior response at room temperature, enabling effective gas sensing under low power conditions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Zuowang Wu,Chong Chen,Lei Wang,Hui Wan,Guofeng Guan
A magnetically recyclable catalyst was prepared by embedding magnetic nanoparticle in poly(phosphotungstate-based ionic liquid) matrix. The obtained hybrid material was characterized by XRD, FT-IR, SEM, TEM, TGA, and VSM. The results indicated that Fe3O4 was successfully implanted in multilayer poly(ionic liquid), and the catalyst possessed open active sites (see SEM) to reactants and a high magnetization value. The combination of poly(ionic liquid) matrix with magnetic nanoparticle enhanced the structure stability and favored the separation performance. Esterification of oleic acid with ethanol was conducted in the presence of prepared catalyst, and the Box–Behnken response surface methodology was applied for maximizing the oleic acid conversion by optimizing process variables at 90 °C. Under the optimum conditions (reaction time, 5 h; catalyst amount, 13 wt %; alcohol/acid molar ratio, 12:1), the conversion of oleic acid reached 93.4%. Besides, the catalyst presented fine reusability after six runs and could be facilely recovered in magnetic field based on its superparamagnetism property.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Panpan Zhao,Fan Yang,Zhigang Zhao,Qiuxiao Liao,Yang Zhang,Peng Chen,Wanghuan Guo,Ruixi Bai
For the first time, our group has developed a novel, high-flux strategy for shape-controlled synthesis of rare earth nano-materials (CePO 4 ) using ionic liquid(IL)-driven supported liquid membrane (HVHP, DUPAPORE ® ) system. The system contains three phases including a supply phase of rare earth ions, a feed phase of phosphates, and ionic liquid-driven supporting liquid membrane phase. The imidazolium IL-driven supported liquid membrane is promising for nano-synthetic reaction of CePO 4 . The anion types of immersed imidazolium IL have a critical role in the formation rate of CePO 4 nano-materials. Moreover, the adding SO 4 2− anion or adjustment of pH in supply phase containing Ce(III) ions could control effectively the morphology of the CePO 4 nano-materials. The result can be regarded as a good example, the IL:[C 4 mim][Tf 2 N] −driven support liquid membrane systems can be used to prepare nano-wire and nano-sphere structures of CePO 4 with high efficiency and flux. Besides, the IL-driven supported liquid membrane can be cycled many times by using the back flush activation method.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·573-584
·
IF 3.431
Liu Jiawei,Liang Yixun,Shen Jiwei,Bai Quan
Polymeric ionic liquids (PILs) with 1-vinyl-3-ethylimidazolium cations and two different anions of Br − and PF 6
− were assembled onto the surface of graphene (G) nanosheets. The derived two composites, i.e., PIL(Br)-G and PIL(PF 6 )-G, were further efficiently immobilized onto the surface of silica nanoparticles via self-assembly technique. The obtained two PIL-G/SiO 2 nanocomposites exhibited diverse adsorption performances toward proteins through adjusting the anions of PILs. Electrostatic attractions between proteins and the nanocomposites dominated protein adsorption, while the presence of PF 6
− anions weakened electrostatic interactions and deteriorated the selective adsorption of target protein, i.e., bovine serum albumin (BSA) in this case. Specifically, PIL(Br)-G/SiO 2 nanocomposite displayed high selectivity toward BSA and a high adsorption efficiency of ca. 98% was achieved for 100 mg L −1 BSA in a Britton-Robinson (B-R) buffer at pH 5. HPLC analysis demonstrated the selectivity of PIL(Br)-G/SiO 2 nanocomposite toward BSA in the presence of abundant hemoglobin and cytochrome c. The practical applicability was verified by performing selective isolation of human serum albumin (HSA) from human whole blood.
Selective isolation of human serum albumin from blood by polymeric ionic liquid assembled graphene immobilized silica nanocomposite with tunable anions
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Lijun He,Wenhang Cui,Yali Wang,Wenjie Zhao,Guoqiang Xiang,Xiuming Jiang,Pu Mao,Juan He,Shusheng Zhang
In this study, layer-by-layer assembly of polyelectrolyte multilayer films on magnetic silica provided a convenient and controllable way to prepare polymeric ionic liquid-based magnetic adsorbents. The resulting particles were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and magnetic measurements. The data showed that the magnetic particles had more homogeneous spherical shapes with higher saturation magnetization when compared to those obtained by free radical polymerization method. This facilitated the convenient collection of magnetic particles, with higher extraction repeatability. The extraction performance of the multilayer polymeric ionic liquid-based adsorbents was evaluated by magnetic solid-phase extraction of four pesticides including quinalphos, fenthion, phoxim, and chlorpropham. The data suggested that the extraction efficiency depended on the number of layers in the film. The parameters affecting the extraction efficiency were optimized, and good linearity ranging from 2 to 250 μg L −1 was obtained with correlation coefficients of 0.9994–0.9998. Moreover, the proposed method presented low limit of detection (0.5 μg L −1 , S/N = 3) and limit of quantification (1.5 μg L −1 , S/N = 10), and good repeatability expressed by the relative standard deviation (2.0%–4.6%, n = 5). The extraction recoveries of four pesticides were found to range from 58.9% to 85.8%. The reliability of the proposed method was demonstrated by analyzing environmental water samples, and the results revealed satisfactory spiked recovery, relative standard deviation, and selectivity.
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ENERGY CONVERSION AND MANAGEMENT
·
2017
·
IF 5.589
Heng Zhang,Hu Li,Hu Pan,Xiaofang Liu,Kaili Yang,Shan Huang,Song Yang
In the present study, catalytic production of biodiesel from a new alternative non-edible feedstock Koelreuteria integrifoliola ( K. integrifoliola ) with a Brönsted-Lewis acidic ionic liquid (IL) immobilized on a magnetic support Fe 3 O 4 @SiO 2 (FS-B-L-IL) was investigated for the first time. Excitingly, K. integrifoliola contains a high oil content (54.05%) with an average acid value (AV) of 4.66 mg KOH/g. Furthermore, the FS-B-L-IL catalyst was characterized with XRD, FT-IR, SEM, HR-TEM, TG, pyridine-IR and VSM. It was found that FS-B-L-IL possessed a uniform core-shell structure with strong magnetic responsiveness, and showed high activity in simultaneously catalytic transesterification and esterification of crude K. integrifoliola seed oil (CKISO), giving fatty acid methyl ester (FAME) yield of 93.7% under optimal conditions. The reaction followed pseudo-first order kinetics and the activation energy was calculated to be 62.6 kJ/mol. In addition, FS-B-L-IL exhibited a heterogeneous catalytic behavior and could be recycled for at least five times with negligible loss of activity. The main fuel properties of the obtained K. integrifoliola biodiesel were also evaluated, which were comparable to specifications prescribed in the ASTM D6751 and EN 14214.
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Catalysis Science & Technology
·
2012
·Vol. 3
·期 4
·1102-1107
·
IF 0
Leqin He,Shenjun Qin,Tao Chang,Yuzhuang Sun,Xiaorui Gao
A long-chain Brønsted acid ionic liquid (IL), 3-(N,N-dimethyldodecylammonium)propanesulfonic acid p-toluenesulfonate ([DDPA][Tos]), was prepared and characterized by FT-IR, 1H NMR, 13C NMR, UV/vis and TGA. The H0 (Hammett function) value of the IL was also determined. The IL as catalyst was applied to the catalytic synthesis of biodiesel from free fatty acids (FFAs). The influencing factors, such as the type and amount of catalyst, reaction time, molar ratio of fatty acid to methanol and reaction temperature, were investigated. The results indicated that the long-chain Brønsted acid IL showed high catalytic activity and fair reusability. Esterification was accomplished under the following optimized conditions: molar ratio of alcohols to FFA at 1.5 : 1, mole fraction of ionic liquid at 10%, 60 °C, and 3 h. The products could be separated from the catalyst system by liquid–liquid biphase separation at room temperature with good yields of 92.5% to 96.5%. The catalyst could be reused nine times after the removal of water and alcohol. Therefore, the long-chain Brønsted acid IL has good potential for the synthesis of biodiesel from low-cost feedstocks such as waste oil and woody plant oils.
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CATALYSIS LETTERS
·
2012
·Vol. 143
·期 2
·200-205
·
IF 2.242
Zeng Yan,Wang Yanhua,Xu Yicheng,Song Ying,Jiang Jingyang,Jin Zilin
Abstract A thermoregulated ionic liquid and organic biphasic system composed of ionic liquid [CH 3 (OCH 2 CH 2 ) 16 N + Et 3 ][CH 3 SO 3
− ] (IL PEG750 ) with IL PEG750 -stabilized Pd nanoparticles and organic solvents, which allows for not only a highly efficient homogeneous catalytic reaction, but also an easy biphasic separation and reuse of catalyst attributed to the thermoregulated phase-transition property of the system, was employed for Heck reaction. The IL PEG750 -stabilized Pd nanoparticle catalyst exhibited high efficiency, more importantly, after reaction the Pd nanoparticle catalyst could be separated from products by simple phase separation and recycled for six times without evident loss of activity. Graphical Abstract A thermoregulated ionic liquid and organic biphasic system containing [CH 3 (OCH 2 CH 2 ) 16 N + Et 3 ][CH 3 SO
- 3
] (IL PEG750 )-stabilized Pd nanoparticles was applied to Heck reaction for the first time. The Pd nanoparticle catalyst exhibited high efficiency and good recyclability.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Yuanchao Pei,Yanjie Huang,Lin Li,Jianji Wang
In this paper, micro-emulsions composed of cholinium-based ionic liquids (ILs), octylphenol ethoxylate (Triton X-100) and water were prepared. These ternary systems were found to be stable over 12 months at room temperature. Their phase behaviour was investigated by using cloud titrations, and their microstructures were characterised by means of cyclic voltammetry and electrical conductance measurements at T = 298.15 K. It was shown that the micro-emulsions exhibited IL-in-water, bi-continuous and water-in-IL microstructures. Dynamic light scattering data suggest that Triton X-100 forms micelles in water, which were swelled by the ILs added. Droplets with the size about 20 nm were formed in these IL-based micro-emulsions, and the droplet size increased with the increase of the IL concentrations. These IL-based micro-emulsions may have potential in drug delivery, chemical reactions and nanomaterial preparation as a new type of nanoreactors.
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ANALYST
·
2014
·Vol. 139
·期 22
·5964-5969
·
IF 3.906
Meina Li,Yingzi Liu,Shushu Ding,Anwei Zhu,Guoyue Shi
A novel approach for in situ synthesizing poly(ionic liquid)–Pt nanoparticle (PIL–Pt) composite in a glass capillary for fabricating filling-type electrode is reported in this work. XRD and TEM were used to characterize the as-synthesized PIL–Pt composite. Because of the modification of poly(ionic liquid)s (PILs), the PIL–Pt composite can not only be dispersed well to form a homogeneous suspension of Pt nanoparticles, but also be synthesized directly in a glass capillary with a tip radius ranging from 250 nm to 2.5 µm. By simple heating at 130 °C, the PIL–Pt composite capillary electrode was fabricated under mild conditions. With the advantages of both PILs and glass capillary, a PIL–Pt capillary electrode can provide a favourable microenvironment for the encapsulated Pt nanoparticles and promote the mass transfer rate; thus, showing a high electrocatalytic activity and stability for an oxygen reduction reaction (ORR). The present study provided a novel method for the development of high performance electrocatalysts based on the construction of PIL–Pt composite in a glass capillary for fuel cell or electrochemical sensors.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2014
·Vol. 15
·期 4
·6161-6168
·
IF 2.339
Runqiang Liu,Yijun Zhang,Lianyang Bai,Mingxian Huang,Jun Chen,Yuping Zhang
A chiral selector of cellulose-2,3-bis(3,5-dimethylphenylcarbamate) (CBDMPC) was synthesized by reacting 3,5-dimethylphenyl isocyanate with microcrystalline cellulose dissolved in an ionic liquid of 1-allyl-3-methyl-imidazolium chloride (AMIMCl). The obtained chiral selector was effectively characterized by infrared spectroscopy, elemental analysis and1H NMR. The selector was reacted with 3-aminopropylsilanized silica gel and the CBDMPC bonded chiral stationary phase (CSP) was obtained. Chromatographic evaluation of the prepared CSPs was conducted by high performance liquid chromatographic (HPLC) and baseline separation of three typical fungicides including hexaconazole, metalaxyl and myclobutanil was achieved using n-hexane/isopropanol as the mobile phase with a flow rate 1.0 mL/min. Experimental results also showed that AMIMCl could be recycled easily and reused in the preparation of CSPs as an effective reaction media.Keywords:1-allyl-3-methyl-imidazolium chloride;synthesis;Cellulose-2,3-bis(3,5-dimethylphenylcarbamate);high performance liquid chromatography;chiral stationary phase;enantioseparation
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Yue Wang,Wenguang Leng,Yanan Gao,Jiansheng Guo
Thermo-sensitive polymer-grafted carbon nanotubes were prepared by surface-initiated atom transfer radical polymerization and carefully characterized. A reversible, temperature-induced phase transfer behavior of these organic–inorganic hybrids between water (with a decrease in temperature to 20 °C) and a hydrophobic ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim]NTf2) (with an increase in temperature to 90 °C), was observed. Mechanism analysis suggests that this reversible phase transfer between water and [Emim]NTf2 is due to the relative affinity of the two solvents for the poly(ethylene oxide) units grafted on the carbon nanotubes. Our results pave the way for further design of carbon nanotube-based, recyclable phase transfer vehicles as well as heterogeneous catalysts suited for a water–hydrophobic ionic liquid biphasic system.
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