ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Wang Yang,Hansheng Li,Qin Wu,Yujing Ren,Daxin Shi,Yun Zhao,Qingze Jiao
A supported alkaline imidazolium ionic liquid catalyst with an ionic liquid shell and polystyrene core was synthesized. The core–shell structure was achieved by swelling polymerization of 4-vinylbenzyl chloride and divinylbenzene around polystyrene particles followed by quaternization reaction with 1-propyl-1H-imidazole and ion exchange. The results obtained from FTIR, SEM, TEM, TGA, DLS, and elemental analysis indicated that the ionic liquid shell was successfully coated on polystyrene spheres. The core–shell catalyst displayed excellent activity and solvent tolerance for Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate because of its good dispersion, low mass-transfer resistance, and good swelling property. Meanwhile, it exhibited superb stability and recyclability, benefitting from the active species being anchored to the highly cross-linked polymer carrier. The catalyst was reused 10 times in water or methanol without significant change in catalytic activity, composition, and microstructure. Moreover, the catalytic performance of the prepared catalyst was weakened by the increased mass-transfer resistance with the movement of active sites from the surface to the interior of the carrier.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiaoyu Lin,Xi He,Ling Lei,Yufeng Zhao,Longzhe Cui,Guiping Wu
Cr(VI)-contaminated water poses a serious threat to the environment. In this study, capsule-type biosorbent Aliquat-336-filled chitosan capsules (AFCCs) were prepared by a simple and gentle method for more efficient and eco-friendly removal of Cr(VI). The experimental results show that the uptake of Cr(VI) by AFCCs increased with increasing Aliquat-336 content. The AFCCs show excellent stability under acidic conditions, and the maximum adsorption capacity was reached at a pH of 2. The maximum adsorption capacity of AFCCs for Cr(VI) was 110.94 ± 5.07 mg/g at 20 °C, which was calculated based on the Langmuir model. The kinetic results show that the adsorption rate control process changed from liquid film diffusion to a chemical reaction with increasing shaking rate. In addition, the AFCCs and adsorption-reduction mechanism of Cr(VI) were characterized by digital photography, electron microscope , zeta potential , Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results indicated that the electrostatic attraction between quaternary amine groups in Aliquat-336 and Cr(VI) anions plays a major role in the removal of Cr(VI). Subsequently, the adsorbed Cr(VI) obtained electrons from C C/C H and NH 3 + / NH 2 + were reduced to Cr(III), while C C/C H and NH 3 + / NH 2 + were oxidized to C O, C O, =NH + , =N and N O, respectively.
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Wenjuan Fang,Yaqin Zhang,Zifeng Yang,Zhencai Zhang,Fei Xu,Weiwei Wang,Hongyan He,Yanyan Diao,Yanqiang Zhang,Yunjun Luo
Herein, an efficient synthetic strategy for synthesis of bio-based polycarbonate has been developed by using tetramethylammonium-based amino acid ionic liquids (AAILs) as catalysts for the melt polymerization of isosorbide (ISB) and dimethyl carbonate (DMC). These AAILs exhibited outstanding catalytic activity towards DMC, enabling the selectivity of carboxymethyl intermediates greater than 99 %. By modifying the anionic structure of AAIL catalysts, the conversion of ISB and the molecular weight of PIC could be remarkably improved. Tetramethylammonium arginine ([N 1111 ][Arg]) showed the highest catalytic activity due to its multiple active sites and high basicity. Combining experimental results and DFT calculations, a plausible reaction mechanism involved synergistic dual activation catalysis of [N 1111 ][Arg] was proposed, which indicated that DMC and ISB were simultaneously activated by forming H-bonds with [N 1111 ][Arg]. In addition to providing a green and economical strategy for preparation of PIC, this work also supplied an in-depth understanding of the structure-property-catalytic performance relationship of ILs.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Fengxiang Liu,Shuang Wang,Hao Chen,Jinsheng Li,Xue Tian,Xu Wang,Tiejun Mao,Jingmei Xu,Zhe Wang
A series of composite cross-linked membrane based on fluorine-containing polybenzimidazole (6FPBI) and a cross-linkable polymeric ionic liquid (cPIL) have been prepared for high temperature proton exchange membrane (HT-PEM) applications. Particularly, the obtained composite cross-linked membranes showed excellent phosphoric acid doping ability and proton conductivity. On the basis of the trade-off between mechanical strength and proton conductivity of composite membranes, the optimal content of cPIL is 20 wt % (6FPBI-cPIL 20 membrane). For instance, the 6FPBI-cPIL 20 membrane with a PA doping level of 27.8 exhibited a proton conductivity of 0.106 S cm–1 at 170 °C, which is much higher than that of pristine 6FPBI membrane. The most outstanding contribution of this work is that the 6FPBI-cPIL membranes showed improved phosphoric acid retention and long-term conductivity stability under harsh conditions (80 °C/40% RH) for 96 h. In particular, the proton conductivity and PA doping level of the 6FPBI-cPIL 20 membrane remained at a high level of 0.064 S cm–1 and 8.5 after 96 h of the test, respectively.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xiang Qiu,Shushu Wang,Shanshan Miao,Hongbo Suo,Huajin Xu,Yi Hu
This work aims to achieve the co-immobilization of laccase and 2,2-binamine-di-3-ethylbenzothiazolin-6-sulfonic acid (ABTS) to improve removal capability of the biocatalyst for pollutants while avoiding potential pollution caused by ABTS. The laccase was immobilized on magnetic chitosan nanoparticles modified with amino-functionalized ionic liquid containing ABTS (MACS-NIL) based on Cu ion chelation (MACS-NIL-Cu-lac). The carrier was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, x-ray diffraction and etc., and electron paramagnetic resonance confirmed the mediator molecule ABTS on the carrier could also play the role of electron transmission. MACS-NIL-Cu-lac presented relatively high immobilization capacity, enhanced activity (1.7-fold that of free laccase), improved pH and temperature adaptability, and increased thermal and storage stability. The removal performance assay found that MACS-NIL-Cu-lac had a good removal efficiency with 100.0 % for 2,4-dichlorophenol in water at 25 °C, even when the concentration reached 50 mg/L. Reusability study showed that after six catalytic runs, the removal efficiency of 2,4-dichlorophenol by MACS-NIL-Cu-lac could still reach 93.2 %. Additionally, MACS-NIL-Cu-lac exhibited higher catalytic efficiencies with 100.0 %, 70.5 % and 93.3 % for bisphenol A, indole, and anthracene, respectively. The high catalytic performance in pure water system obtained by the novel biocatalyst co-immobilizing laccase and electron mediator ABTS showed greater practical application value.
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Hongpeng Yang,Lei Zhang,Li Chen,Cunshan Zhou,Xiaojie Yu,Abu El-Gasim A. Yagoub,Haile Ma
Aqueous biphasic system (ABS) has been proposed as an alternative technique for the extraction, separation and/or purification of diverse biomolecules. ABS composed of polyethylene glycol (PEG) and sodium salts, using ILs ([C n mim]Cl) as additives were studied. Phase diagrams of PEG 800 + sodium salts (Na 2 HPO 4 , Na 3 C 6 H 5 O 7 , Na 2 CO 3 , Na 2 SO 4 , NaH 2 PO 4 ) + H 2 O + 5 wt% [C 4 mim]Cl at 298.15 K were used to study the effect of different salts on the ABS. Binodal curves for the ABS composed of PEG (molecular weights of 400, 600, 800, 1000 and 2000 g·mol −1 ) + Na 2 SO 4 + H 2 O + 5 wt% IL ([C 2 mim]Cl, [C 4 mim]Cl, [C 6 mim]Cl, [C 8 mim]Cl, [C 10 mim]Cl) at 298.15 K were determined to study the effect of the polymer size and the IL alkyl side chain length on ABS. Ability of the various salts to form ABS follows the trend: Na 3 C 6 H 5 O 7 > Na 2 HPO 4 > Na 2 CO 3 > Na 2 SO 4 > NaH 2 PO 4 . The increase in the molecular weight of PEG increases the phase separation ability of the system. [C 6 mim]Cl shows the best phase separation at PEG400 + Na 2 SO 4 . [C 8 mim]Cl and [C 10 mim]Cl improves the phase separation of PEG-Na 2 SO 4 . The phase diagram is not affected at 288.15–308.15 K. The phase separation increases at 318.15–328.15 K and decreases at >318.15 K. These results illustrate the ability of the IL to tune the polarity of the PEG-rich phase. PEG–Salt–IL ABS could be an interesting advance in separation processes and could lay the basis for future studies in extraction processes.
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高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Rong Qu,Zijie Ren,Na Li,Fangfang Zhang,Zhengyu Jason Zhang,Haining Zhang
Design and synthesis of effective catalysts for the conversion of epoxy compounds to cyclic carbonate under the presence of carbon dioxide molecules is essential for the utilization of carbon dioxide. Herein, we report that the surface-attached imidazolium-type poly(ionic liquid) bearing amine moieties is an efficient catalyst for the conversion of epoxy compound and carbon dioxide to cyclic carbonate. The effect of chemical structure of the synthesized catalyst and the reaction conditions on the catalytic efficiency is systematically studied. The results show that the catalyst with bromide anion can effectively catalyze the reaction under 1.5 MPa carbon dioxide pressure at 120 °C with the catalyst content of 10 mg mL −1 , reaching the conversion rate up to 90 %. Moreover, the synthesized catalyst can be separated from the cyclic carbonate products by centrifugation. The recyclability and reversibility measurements reveal that the decay of the catalytic activity is mainly resulted from the adsorption of the cyclic carbonate products on the catalysts. The catalytic activity of the synthesized catalyst towards conversion of epichlorohydrin and carbon dioxide to cyclic carbonate can be recovered after extraction of the adsorbed cyclic carbonate products.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Xinxin Ruan,Huanyi Chen,Chengcheng Jiao,Xianzhe Wei,Yandong Wang,Ping Gong,Lexin Song,Kazuhito Nishimura,Jinhong Yu,Nan Jiang,Tao Cai
Bio-based protic ionic liquids (bio-PILs) based on 2,5-Furandicarboxylic acid and polyetheramine was synthesized, which was explored as a neat lubricant and lubricant additive for different alcohols that has different hydroxyl numbers under varied test conditions. Long-term service performance testing showed that the bio-PILs could achieve ultra-low coefficient of friction and wear simultaneously, which decreased coefficient of friction of 95.94% and wear rate of 99.87% compared to dry friction under Si 3 N 4 -to-steel tribo-pairs. The distinguished tribological performance is contributed to the bio-PILs can absorb on the rubbing surface and form a lubricating protective film to avoid direct contact of super hard upper Si 3 N 4 ball against lower steel plate. This work presents a facile approach to synthesize high-performance bio-based protic ionic liquids using biomass as bridging agent and provides new insight into the underlying lubricating mechanism, which might help guide the development of novel bio-based lubricants in the future.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 65
·60709-60716
·
IF 3.289
Xuenan Li,Xiao Zhang,Qiwei Yang,Zongbi Bao,Qilong Ren,Zhiguo Zhang,Huabin Xing,Yiwen Yang
The effective separation and utilization of high value-added unsaturated fatty acid methyl esters from model bio-oils could make full use of the biomass resources and greatly improve the economic feasibility of bio-fuels. Selective separation of unsaturated fatty acid methyl esters was performed by liquid–liquid extraction, using ionic liquids (ILs) as extractants in the presence of cosolvent. The results showed that the mixture of 1-ethyl-3-methylimidazolium dicyanamide ([EMIm][N(CN)2]) and N,N-dimethylformamide (DMF) demonstrated excellent separation selectivity, reaching up to an outstanding value of 11.7, when the mole ratio of [EMIm][N(CN)2] to DMF was 1 : 9, at least twice the value (5.6) using DMF as the extractant. In addition, the effects of the structure, the mole fraction of ILs, the feedstock concentration and temperature, on extraction equilibrium were studied. By calculating the fractional extraction, the feasibility of liquid–liquid extraction for practical application was confirmed.
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高影响因子
CARBOHYDRATE POLYMERS
·
2010
·Vol. 83
·期 4
·1631-1635
·
IF 3.167
Kun Huang,Jianling Xia,Mei Li,Jianwei Lian,Xiaohua Yang,Guifu Lin
Cellulose stearates with different degrees of substitution (DS) were prepared homogeneously in ionic liquid 1-butyl-3-methylimidazolium chloride ([C 4 mim] + Cl − ) solution. Cellulose stearates with DS values of 2.15, 2.19 and 2.57 exhibited good solubility in nonpolar organic solvents . It was indicated by differential scanning calorimetry (DSC) that the melting temperatures of the three cellulose stearates ranged from 38.66 to 56.63 °C. Thermogravimetric (TG) analysis showed that the commencing degradation temperature of the three cellulose stearates were 300 °C, 325 °C and 370 °C, respectively. The cellulose stearate with the DS value of 2.57 has better thermal stability than cellulose.
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高影响因子
HYDROMETALLURGY
·
2025
·
IF 5.3
Feng Feng,Heda Ding,Jiaying Zhang,Lu Yu,Yuxue Yue,Yanxia Sun,Lingling Guo,Xiaoliang Xu,Chunshan Lu,Qunfeng Zhang,Xiaonian Li
The development of industrial technology has significantly promoted the production and accumulation of spent precious metal-based catalysts. This work describes the synthesis of an ionic liquid – [BIim][Cl 3 ] and its application as an alternative to toxic and corrosive reagents for precious metal leaching from waste catalysts. The leaching process using [BIim][Cl 3 ] is proved to be safe and green. It offers a higher stability and higher leaching efficiency compared to other reagents used in previous publications. The ionic liquid [BIim][Cl 3 ] enabled the efficient leaching of Pd and Au, as well as the extremely stable precious metals Pt, Rh under mild conditions. The highest leaching efficiencies achieved by [BIim][Cl 3 ] were 99.9 %, 98.5 %, 98.6 % and 90.6 % for Pd, Au, Pt and Rh under the optimal leaching conditions, respectively. In order to reveal the leaching mechanism, XPS, far infrared (FIR), NMR, and EDS were used to demonstrate the importance of imidazolium cations in the leaching process. The leaching pathway was proposed based on the DFT calculation results on transition state energy barrier.
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Ying Kang,Yu-Hao Shi,Xiao-Man Huang,Jian-Zhong Guo,Bing Li
Environmentally friendly hydrochar demonstrates excellent performance in the treatment of cationic pollutants, yet its capability to address anions is limited. Cationic imidazolium ionic liquids carry a positive charge, and modification of the surface of hydrochar can increase its positive charge, thereby improving its ability to remove anions. Herein, bis-imidazolium-based poly(ionic liquid)-functionalized hydrochar (BIPIL-HC) was prepared using hydrochar derived from the hydrothermal carbonization of bamboo powder and N,N’-methylene-bis(1-(3-vinylimidazolium)) chloride via free radical polymerization and characterized using different instruments. The behavior of BIPIL-HC in adsorbing methyl orange (MO) and sodium 2,4-dichlorophenoxyacetate (2,4-D Na) was studied by using batch adsorption experiments, including the effects of initial concentration and temperature, solution pH, contact time on adsorption, and regeneration experiments. The adsorption kinetics and isotherms conformed to pseudo-second-order kinetics and Langmuir models. The adsorbing capacity of BIPIL-HC for MO and 2,4-D Na reached 554.91 and 565.50 mg·g–1, respectively. BIPIL-HC is also effective in removing MO and 2,4-D Na under diverse pH values and is highly reusable. Mechanism analysis shows that hydrogen bonding, ion exchange, electrostatic, and π-π interactions promote the adsorption of the two pollutants by BIPIL-HC. Particularly, the imidazolium group of BIPIL-HC is decisive in its capture ability of the two anionic pollutants through anion exchange and electrostatic interaction. These results confirm that the use of ionic liquid functionalization as a method for modifying hydrochar can effectively enhance the treatment capacity of hydrochar for anionic wastewater, and the obtained BIPIL-HC shows promising value in anionic wastewater handling.
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DOI
PubMed
高影响因子
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