BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Jun Cheng,Jiabei Zhang,Richen Lin,Jianzhong Liu,Li Zhang,Kefa Cen
An ionic liquid of N-methylmorpholine-N-oxide (NMMO) was used to effectively pretreat cassava residues for the efficient enzymatical hydrolysis and cogeneration of fermentative hydrogen and methane. The reducing sugar yield of enzymolysed cassava residues with NMMO pretreatment improved from 36 to 42 g/100 g cassava residues. Scanning electron microscopy images revealed the formation of deep grooves (∼4 μm wide) and numerous pores in the cassava residues pretreated with NMMO. X-ray diffraction patterns showed that the crystallinity coefficient of NMMO-pretreated cassava residues decreased from 40 to 34. Fourier transform infrared spectra indicated that crystal cellulose I was partially transformed to amorphous cellulose II in the NMMO-pretreated cassava residues. This transformation resulted in a reduced crystallinity index from 0.85 to 0.77. Hydrogen yield from the enzymolysed cassava residues pretreated with NMMO increased from 92.3 to 126 mL/g TVS, and the sequential methane yield correspondingly increased from 79.4 to 101.6 mL/g TVS.
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高影响因子
Small
·
2016
·Vol. 12
·期 14
·1935-1944
·
IF 8.315
Jingyue Zhu,Dan Xu,Wenjing Qian,Jinyu Zhang,Feng Yan
A simple strategy for the synthesis of heteroatom-doped porous carbon materials (CMs) via using ionic liquid (IL)-doped alkali organic salts as small molecular precursors is developed. Doping of alkali organic salts (such as sodium glutamate, sodium tartrate, and sodium citrate) with heteroatoms containing ILs (including 1-butyl-3-methylimidazolium chlorine and 3-butyl-4-methythiazolebromination) not only incorporates the heteroatoms into the carbon frameworks but also highly improves the carbonization yield, as compared with that of either alkali organic salts or ILs as precursors. The porous structure of CMs can be tuned by adjusting the feed ratio of ILs. The porous CMs derived from 1-butyl-3-methylimidazolium chlorine-doped sodium glutamate exhibit high charge storage capacity with a specific capacitance of 287 F g −1 and good stability over 5000 cycles in 6 m KOH at a current density of 1 A g −1 for supercapacitors. This strategy opens a simple and efficient method for the synthesis of heteroatom-doped porous CMs.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 3
·823-831
·
IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2016
·
IF 3.299
Nawshad Muhammad,Yanan Gao,Farasat Iqbal,Pervaiz Ahmad,Rile Ge,Umar Nishan,Abdur Rahim,Girma Gonfa,Zahoor Ullah
In this study the waste fish scales (FS) were dissolved in 1-butyl-3-methylimidazolium acetate ionic liquid to obtain a valuable product of hydroxyapatite (HAp). The HAp was obtained in the yield of 32 ± 2%. The obtained HAp was characterized using Fourier Transform Infrared Spectroscopy (FTIR), Powder X-rays Diffraction (PXRD), Thermal Gravimetric Analysis (TGA), Field Emission Scanning Microscopy (FE-SEM), Energy Dispersive X-rays spectroscopy (EDX), and Brunauer–Emmett–Teller (BET). The results of FTIR and XRD showed the characteristic peaks of the HAp. The thermal degradation temperature of the extracted HAp was relatively high. Furthermore, low weight loss was measured which confirmed the removal of organic part of FS during ionic liquid treatment. The FE-SEM result showed the particles with different morphologies and EDX analysis showed a Ca/P ratio of 1.60 for the extracted HAp. The biocompatibility of the extracted HAp was assessed through MTT cell viability assay using known Human Embryonic Kidney 293 cells (HEK cells) and epidermoid carcinoma cells (A431 cells).
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SOLID STATE IONICS
·
2016
·
IF 2.38
Wei Zhai,Yi-wei Zhang,Long Wang,Feng Cai,Xiao-min Liu,Yu-jun Shi,Hui Yang
A series of novel nano-composite polymer electrolytes (NCPEs) are prepared with the ionic liquid of N-methyl-N-methoxyethylpiperidiniumbis(trifluoromethanesulfonyl)imide (PP 12O1 TFSI) as plasticizer and nano-sized TiO 2 as additive. The effect of the ratio of TiO 2 to Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) on the properties of the NCPEs are studied, such as the crystallinity and ionic conductivity . The results indicate that the nano-composite polymer electrolyte NCPE-2, that the ratio of TiO 2 to PVDF-HFP is 10%, exhibits the highest ionic conductivity of 2 × 10 − 3 S·cm − 1 with the lowest crystallinity. The LiFePO 4 /NCPE-2/Li coin-typed cell cycled at 0.5 C shows the 1st discharge capacity of 127.9 mAh g − 1 and remains 97.6% of the initial discharge capacity on the 50th cycle.
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2016
·
IF 1.411
Huili Ma,Li Wang,Zhiguang Liu,Yujing Guo
In this work, ionic liquid–graphene nanosheets (IL–GNs) were synthesised and used as an enhanced material for sensitive detection of methyl parathion (MP) by electrochemical method. IL–GNs were characterised by UV–Vis spectroscopy, transmission electron microscopy (TEM), X-ray photo-electron spectroscopy (XPS), Fourier transform Infrared (FT-IR) spectroscopy and Raman spectroscopy, which confirmed that IL was successfully covered on the surface of GNs. Significantly, due to the coupling of excellent properties of GNs and IL, the IL–GNs-modified glassy carbon electrode (IL–GNs/GCE) showed higher signals for MP response than the GNs/GCE and bare GCE. At the IL–GNs/GCE, the peak currents increase linearly with the concentration of MP in the range of 5.3 ng/mL to 2.6 μg/mL with the detection limit of 1.1 ng/mL, which was better than other enzyme-based and enzymeless sensors. The IL–GNs-based electrochemical sensor was also successfully demonstrated for the detection of water sample with satisfactory results. Furthermore, the proposed electrochemical sensor exhibited satisfied stability and reproducibility. The simple sensing platform can be extended to detect other organophosphate pesticide.
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高影响因子
AICHE JOURNAL
·
2017
·Vol. 63
·期 9
·4115-4123
·
IF 2.836
Peng Guo,Changfeng Zeng,Chongqing Wang,Lixiong Zhang
Surfactant-free magnetic ionic liquid (MIL)-water Janus microdroplets with adjustable structures and morphologies are prepared in capillary-based microfluidic devices. Their morphologies (e.g., sizes, curvatures of the interfaces, and structures from Janus to core/shell) can be adjusted in a wide range by changing the flow rate ratio of water to MIL, adding different mass fractions of polyethylene glycol in water, and using soybean oil rather than liquid paraffin as the continuous phase. MIL-water-MIL ternary Janus magnetic microdroplets with adjustable symmetric and asymmetric structures are also prepared. These Janus microdroplets can be manipulated by magnetic attraction, leading to easy formation of water-MIL-water, MIL-water-oil, necklace-structured MIL-water alternative Janus droplets as well as more complex Janus droplets, such as MIL-CO 2 -in-water and MIL-water-water droplets. Such preparation strategy is simple and can be applied in fields like pharmaceuticals, multi-drug chemotherapies, and catalysis with expensive materials. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4115–4123, 2017
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BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Ken-Lin Chang,Xi-Mei Chen,Xiao-Qin Wang,Ye-Ju Han,Laddawan Potprommanee,Jing-yong Liu,Yu-Ling Liao,Xun-an Ning,Shui-yu Sun,Qing Huang
This work describes an environmentally friendly method for pretreating rice straw by using 1-Allyl-3-methylimidazolium chloride ([AMIM]Cl) as an ionic liquid (IL) assisted by surfactants. The impacts of surfactant type (including nonionic-, anionic-, cationic- and bio-surfactant) on the ionic liquid pretreatment were investigated. The bio-surfactant + IL-pretreated rice straw showed significant lignin removal (26.14%) and exhibited higher cellulose conversion (36.21%) than the untreated (16.16%) rice straw. The cellulose conversion of the rice straw pretreated with bio-surfactant + IL was the highest and the lowest was observed for pretreated with cationic-surfactant + IL. Untreated and pretreated rice straw was thoroughly characterized through SEM and AFM. In conclusion, the results provided an effective and environmental method for pretreating lignocellulosic substrates by using green solvent (ionic liquid) and biodegradable bio-surfactant.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Jianwei Li,Xiang Li,Yan Liu,Jie Zhang
The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac] − > [OH] − ≈ [Br] − > [BF 4 ] − . The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac − ionic liquids and NaOH (aq) at a volume ratio of 40:1 ( V (oil): V (ionic liquid)) and a short equilibrium time within 10 min.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Hai Su,Haitao Zhang,Fangyan Liu,Fengjun Chun,Binbin Zhang,Xiang Chu,Haichao Huang,Weili Deng,Bingni Gu,Hepeng Zhang,Xiaotong Zheng,Minhao Zhu,Weiqing Yang
Supercapacitors with ionic liquid (IL) electrolytes can reach high work voltage and accompanied high energy density, which are the critical parameters for supercapacitors’ rapid development. However, supercapacitors with IL electrolytes usually suffer from low power density due to low conductivity, large ionic size and high viscosity of the electrolytes. Herein we reported hierarchically porous sheet-like nanocarbons (HPSNCs) prepared by direct activation of graphene oxide and polytetrafluoroethylene (PTFE) polymer are promising electrode materials for high power supercapacitors with also high energy density. During the activation process, the PTFE particles as a spacer that can effectively hinder the restack of graphene oxide and simultaneously transformed into sheet-like nanocarbons at high temperatures. As a result, the as-prepared samples exhibit highest surface area of ∼2000 m 2 g −1 and largest pore volume of 1.90 cm 3 g −1 . Benefit from hierarchically porous structure from micro-to-macro-pores, which largely shorten the diffusion distance of electrolyte ions, the HPSNC electrodes show a high energy density of 51.7 Wh kg −1 at a power density of 35 kW kg −1 in symmetric supercapacitors with IL electrolyte. In addition, the HPSNC-based supercapacitors also possess an excellent cycling stability with 88% capacitance retention after 5000 cycles. Unambiguously, this work demonstrated the potential of HPSNCs for high power supercapacitors with high energy density and application in integrated energy management electronics.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Baohao Yang,Jianhui Zeng,Ting Liang,Meng Han,Chenxu Zhang,Jian-Bin Xu,Yimin Yao,Rong Sun
The rapid advancements in high-density packaging underscore the critical demand for advanced thermal interface materials (TIMs). Developing TIMs with exceptional mechanical flexibility, robust interfacial adhesion, minimal thermal resistance, and superior thermal stability presents a significant challenge. Here, we introduce poly(ionic liquid)s (PILs) as the matrices for TIMs, representing an initial investigation into the feasibility of PIL-based TIMs. Specifically, poly(1-octyl-3-vinylimidazole) bis(trifluoromethanesulfonyl)imide (P[OVIm]NTf2) shows a remarkable tensile elongation (>2300%), strong interfacial adhesion (6.9 MPa with steel, 6.6 MPa with copper), elevated thermal decomposition temperature (>240 °C in air), excellent thermal stability (no mass loss at 150 °C), rapid self-healing capability, and reprocessability. As a proof of concept, liquid metal (LM) was utilized as a filler within P[OVIm]NTf2 matrix to fabricate TIMs containing a substantial LM content (>60 vol%). The P[OVIm]NTf2/LM visco-elastomers achieve a remarkable thermal conductivity of 3.2 W m−1 K−1. Furthermore, the composites display an elongation of 109% while maintaining strong interfacial adhesion (0.95 MPa) with steel. In a practical application scenario, the P[OVIm]NTf2/LM visco-elastomers efficiently disperse heat, highlighting their potential practical utility. This study presents a novel approach by advocating the use of PILs as an alternative to conventional silicone matrices, thereby validating the potential application of PILs in the TIM domain.
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Molecular Catalysis
·
2025
·
IF 4.9
Rui Li,Lipeng Wang,Meilin Yin,Yangyang Lei,Shaokun Tang
CO 2 capture and utilization has received worldwide attention in view of the goals of sustainable development and carbon neutrality. Ionic liquid-functionalized covalent-organic frameworks (IL-COFs) possess high adsorption performance and catalytic activity, which overcome the drawbacks of cycling difficulty for pure ILs as homogeneous catalysts and deficient catalytic active sites for COFs. In this work, BpCOF is first rapidly synthesized by solvothermal-scCO 2 -assisted activation method. Afterwards, poly(ionic liquid)s and metal sites are introduced into BpCOF to obtain Zn-R-PIL-BpCOF (R = COOH, CH 3 ) materials through two-step modification including free radical polymerization and metallization. Then the CO 2 adsorption performance, catalytic activity for CO 2 cycloaddition with epichlorohydrin and catalytic recyclability of the materials are investigated. The excellent diffusion behavior of supercritical CO 2 and extremely low surface tension contribute to the rapid synthesis of highly crystalline BpCOF. The crystal structure and micromorphology of the materials are preserved after the two-step modification while the specific surface area and pore volume are decreased. The isosteric heat of adsorption of CO 2 for the typical sample Zn-COOH-PIL-BpCOF is higher than that of BpCOF, indicating the enhanced interaction with CO 2 by the integrated poly(ionic liquid)s and metal sites. Then Zn-COOH-PIL-BpCOF serves as catalyst and the yield of cyclic chloropropylene carbonate reaches 99.3 % at 90 °C and 2.0 MPa for 16 h under solvent-free and co-catalyst-free conditions. The carboxyl hydrogen-bond donors (HBDs), Zn 2+ Lewis acidic sites and Br − nucleophilic group in Zn-COOH-PIL-BpCOF play the roles synergistically. Zn-COOH-PIL-BpCOF exhibits excellent catalytic sustainability and reusability with the product yield exceeding 95 % after six cycles.
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