CELLULOSE
·
2020
·Vol. 27
·期 12
·6897-6908
·
IF 4.21
Guo Weihao,Zuo Minghui,Zhao Jian,Li Chao,Xu Qiaoliang,Xu Chunzhao,Wu Hongfeng,Sun Zhizhong,Chu Wenyi
A series of Brønsted–Lewis acidic di-cationic ionic liquids ( BLAILs ) were synthesized and the catalytic properties of glucose conversion to 5-hydroxymethylfurfural (5-HMF) were investigated. The experimental results showed that the ionic liquid with aluminum trichloride as Lewis acid anion ( BLAIL - 5 ) exhibited good catalytic performance. Under the best reaction conditions, the yield of the glucose conversion into 5-HMF and 5-EMF were 71% and 66%, respectively. In addition, the yield of cellulose to 5-HMF is 41%. The optimized catalytic system could be reused for 5 times without significant catalytic performance loss. In addition, the mechanism of BLAIL - 5 promoting glucose conversion to 5-HMF was studied by density functional theory calculation (DFT).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Qi,Junhui He,Mengjie Li,Maolin Zhai,Long Zhao
Rhenium has important applications in metallurgy, military, aviation, chemical, and petrochemical industries and related fields. Because the average concentration of rhenium in the Earth’s crust is just one part per billion (ppb), it is necessary to research the separation and extraction of rhenium from its associated minerals or related solutions. In this study, rhenium extraction through demulsification of an alkyl imidazolium ionic liquid-based microemulsion was explored. Alkyl chain length, components of microemulsion, temperature, acid concentration, and competitive ions affecting rhenium extraction were thoroughly considered. The components of the microemulsion had a significant effect on the extraction process. Extraction efficiency improved with the increase in the alkyl chain length, but it decreased with the rising concentration of nitric acid. The concentration of alkyl imidazole cations in the continuous phase had obvious effects on extraction efficiency. Thermodynamic studies showed the process was endothermic and spontaneous. The extraction mechanisms were an anion exchange and electrostatic attraction between the two N atoms of the imidazole ring and water (H 2 O) or perthenate (ReO 4 − ) forming the complex ([Omim]ReO 4 )•(HReO 4 ). Thus, the extraction efficiency of the microemulsion system was about 1.6 times greater than that of the performance of ionic liquids alone. A microemulsion system can be damaged by a strong electrostatic repulsion and steric hindrance effect between the adjacent imidazole rings on the interface of the microemulsion droplet after rhenium extraction. The extraction system is a potential application for the selective separation and extraction of rhenium from simulated radionuclide liquid waste through adjustments to the acidity concentration. Findings of this study provide some basic data regarding the technology for separating and extracting rhenium in future.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Huan Wang,WenWen Wu,DanYi Wei,ZhiYong Guo,Sui Wang
Three-phase hollow fiber based liquid phase microextraction (HF-LPME) was developed for the preconcentration of kanamycin sulfate combined with electrochemiluminescence detection. The extractant was 1-octyl-methylmidazolium hexafluorophosphate ([OMIM]PF 6 ). A hollow fiber supported liquid membrane was used between phosphate buffer solution (PBS) containing analyte (kanamycin sulfate) as donor phase and aqueous solution (pH 10) as acceptor phase. The effects of various parameters on the extraction efficiency were studied, such as pH of ECL working solution, extraction temperature, pH of donor phase, extraction time and salt content of sample. Under the optimized conditions, the linear range was 0.002–0.1 μg mL −1 , and the limit of detection (LOD) was 0.00067 μg mL −1 . No expensive equipment is necessary to perform this assay which makes it a viable replacement.
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RSC Advances
·
2012
·Vol. 2
·期 29
·10840-10843
·
IF 0
Qiu-Ping Li,Bing Yan
A novel GaN-based luminescent hybrid material has been prepared by covalently functionalizing the GaN matrices with an ionic liquid (IL), and then exchanging the anion of the IL with lanthanide complexes. 1-Methyl-3-[3-(trimethoxysilyl)propyl]imidazolium chloride, a kind of multi-functional room temperature IL, is used to silanize the hydroxylated surfaces of the GaN sample. After that, an anion exchange measurement is performed to introduce the tetrakis β-diketonate europium(III) complex anion to the GaN matrices. The FTIR spectra, UV-vis diffuse reflection absorption spectra, scanning electron micrograph, XRD patterns and photoluminescent properties (luminescence, lifetime and quantum efficiency) for the resulting material were studied in detail. The results suggest that our method is an effective way for constructing novel functional GaN based hybrid materials.
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ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Min Wang,Qi Wang,Junzheng Wang,Ronghao Liu,Guanju Zhang,Yanzhao Yang
Two ionic liquid (IL) thermomorphic systems were designed. The thermoregulated property exhibited by the IL systems was utilized for the recovery of Au(III) from acidic medium. The cloud point order of the two ILs was proposed and evidenced via a combination of experimental measurements and quantum chemical calculations. The impacts of salt ions and acid on the thermomorphic phase behavior of the IL–H2O binary mixture system were investigated. After comprehensive comparison, a systematic study of Au(III) extraction by the [Suc][Tf2N]2 (succinyl bis(trifluoromethylsulfonyl)imide) system was carried out because of its outstanding hydrophobicity and extraction ability. Then, a comparison between traditional liquid–liquid extraction (TLLE) and homogeneous liquid–liquid extraction (HLLE) was made during the process of optimization of various extraction parameters. In addition, the anion-exchange mechanism in the extraction process was revealed. The thermoregulated [Suc][Tf2N]2 system presented an excellent selectivity for Au(III) in a solution of coexisting multimetallic ions. Finally, Au(III) was almost completely stripped from the loaded IL phase by oxalic acid. The extraction efficiency of Au(III) using regenerated IL still maintains a surprising stability after five turns of cycling experiments. Hence, the dicationic IL [Suc][Tf2N]2 was regarded as a potential extractant for the recovery of gold.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Xin Qiu,Jian Ke,Wenbei Chen,Huixian Liu,Xiaoping Bai,Yibing Ji,Jianqiu Chen
With the development of pharmaceutical field, the demand for single enantiomer drugs is gradually increasing. Recently, chiral membrane separation technology has great potential in the field of enantioseparation due to its simple preparation, continuous operation and easy scale-up. In this study, a novel β-cyclodextrin-ionic liquid thin film composite membrane (β-CD-IL TFCM) was fabricated by interfacial polymerization method to achieve the enantioseparation of chiral drugs. Various fabrication conditions of the membrane were optimized with tryptophan as a model molecule to improve its enantioselectivity. Under optimal fabrication conditions, the percent enantiomeric excess (e.e.%) of tryptophan was 100.0% and the solute flux (J S ) was 8.0 nmol cm −2 h −1 . Enantioseparation of various chiral drugs was achieved using β-CD-IL TFCM, including propranolol (e.e.% = 73.4%), warfarin (e.e.% = 11.4%), metoprolol (e.e.% = 3.4%), ibuprofen (e.e.% = 17.8%) and terbutaline (e.e.% = 3.3%). In addition, molecular docking simulation was applied to investigate the separation mechanism of chiral drugs, demonstrating that multiple interactions promote the separation of drug enantiomers. These results reveal the excellent enantioseparation performance of β-CD-IL TFCM, which has a wide prospect in realizing industrial application of chiral membranes.
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Sensor Letters
·
2014
·Vol. 12
·期 10
·1462-1468
·
IF 0.558
Liu Zhi-Min,Zheng Ying-Ying,Jing Yan-Feng,Li Jie,Zhan Hai-Jun,Shen Qi
A facile, one-step synthesis of ionic liquid-functionalized graphene (IL-GR) nanocomposite using graphene oxide (GO) and amine-terminated ionic liquid (NH2-IL) was first presented through an epoxide ring-opening reaction, then acetylcholinesterase (AChE) was immobilized onto
IL-GR nanocomposite film modified glassy carbon electrode to prepare a highly sensitive AChE biosensor. The morphologies and electrochemistry properties of the composite were investigated by using scanning electron microscopy, transmission electron microscopy and cyclic voltammetry, respectively.
The nanocomposite not only provided a biocompatible microenvironment to keep the bioactivity of AChE, but also exhibited a strong synergetic effect on improving the sensing properties of phoxim. The immobilized AChE showed favorable affinity to acetylthiocholine (ATCl) and could catalyze the
hydrolysis of ATCl with a Kapp
m
value of 0.143 mM. The proposed biosensor exhibited a detection limit of 6.0 × 10–11 M (S/N = 3) towards phoxim. Besides, the biosensor is easy to prepare, have good stability, and will have potential application
in organophosphate pesticides.
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Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Dong,Gao Hongquan,Hua Guomin,Zhou Haitao,Wu Jianchun,Zhu Bowei,Liu Chao,Yang Jianhong,Chen De
Carbon-ionic liquid (C-IL) supercapacitors (SCs) promise to provide high capacitance and high operating voltage, and thus high specific energy. It is still highly demanding to enhance the capacitance in order to achieve high power and energy density. We synthesized a high-pore-volume and specific-surface-area activated carbon material with a slit mesoporous structure by two-step processes of carbonization and the activation from polypyrrole. The novel slit-pore-structured carbon materials provide a specific capacity of 310 F g−1 at 0.5 A g−1 for C-IL SCs, which is among one of the highest recorded specific capacitances. The slit mesoporous activated carbons have a maximum ion volume utilization of 74%, which effectively enhances ion storage, and a better interaction with ions in ionic liquid electrolyte, thus providing superior capacitance. We believe that this work provides a new strategy of engineering pore structure to enhance specific capacitance and rate performance of C-IL SCs.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19824-19833
·
IF 3.925
Xiaoxia Liu,Yang Wu,Yangyang Wang,Huiying Wei,Jinxin Guo,Yanzhao Yang
Liquid–liquid extraction technology based on ionic liquids (ILs) is an efficient and environmentally friendly method to recover Au(III). This work aims to separate Au(III) from hydrochloric acid media using a novel IL [DBA-Pyr][NTf2], which is a pyrrolidinium-based IL functionalized with amide groups. Firstly, experiments have been carried out under optimal conditions, including the concentration, acidity and temperature. It turns out that low concentrations of hydrochloric acid help in Au(III) extraction, while the increase of chloride ion concentrations has an adverse effect. Then, through Job's method, extraction complexes with a molar ratio of [DBA-Pyr][NTf2]-to-Au(III) of 1 : 1 were determined. And, the anion exchange extraction mechanism was confirmed by FT-IR, UV-Vis, and 13C NMR spectroscopies and an electrostatic potential energy (ESP). Under the optimal extraction conditions, it has excellent selectivity to Au(III) compared to both base metal ions and platinum group metals (PGMs). Furthermore, Au(III) could also be recovered from the IL phase using an aqueous solution of thiourea in 95.6% with high selectivity. After 4 cycle experiments, an extraction efficiency of more than 90% is still maintained. The results show that [DBA-Pyr][NTf2] has potential application prospects in Au(III) recovery from hydrochloric acid media.
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JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yanrong Liu,Yi Nie,Fengjiao Pan,Le Zhou,Xiaoyan Ji,Zhaoqing Kang,Suojiang Zhang
In this work, the cellulose phase separation behavior was investigated by using ionic liquids (ILs) as novel solvents to acquire a green process for cellulose fiber spinning. The cloud point titration method combined with the turbidity correlation equation was used to obtain the ternary diagram of IL/cellulose/coagulator throughout the whole compositional range. The effects of the type of ILs, the cellulose materials, the kind of coagulators and the regeneration temperatures for cellulose fiber manufacturing process on the phase separation behavior were studied systematically. It was found that the linearized cloud point (LCP) curve correlation fits to experimental data well and can be used to quantify the optimized coagulator, and among the studied cases, the system of [EMIM]DEP, cotton pulp and water with the regeneration temperature at 298.15 K is the best. Meanwhile, COSMO-RS was used to predict the interaction between solvent, cellulose and coagulator, and the comparison with the LCP correlation shows good agreement. The crystal structure of the regenerated cotton pulp was determined with XRD, and the result evidences that the crystal structure of the regenerated cellulose transforms from cellulose I to cellulose II. The crystallinity decreases from 96.0% (raw cotton pulp) to 85.6% after 24 h dissolution in [EMIM]DEP at 363.15 K, and it has a slight deviation from 24 h to 72 h, which illustrates that the spinning process can run continuously at 363.15 K when using [EMIM]DEP as the solvent.
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MATERIALS RESEARCH INNOVATIONS
·
2015
·
IF 0.83
X. L. Zou,S. L. Gu,G. Q. Lai,C. Y. Lu,X. L. Xie,X. G. Lu,Z. F. Zhou
The electrodeposition of nano-iron films from Fe2O3 precursor in an ionic liquid composed of 33·3 mol-% choline chloride (ChCl) and 66·7 mol-% ethylene glycol (EG) has been investigated. The electrodeposition process was carried out at 1·5–1·9 V and 60–120°C for 3 hours. The influences of experimental parameters on the electrodeposition process and the morphology of the deposited nano-iron films were studied. The results show that compact and uniform nano-iron (particle size is approximately 100–200 nm) films can be electrodeposited in the Fe2O3-saturated ChCl-EG ionic liquid at 1·8–1·9 V and 60–120°C. The electrodeposition temperature and applied potential have significant influences on the characteristics of the deposited nano-iron films and the electrodeposition process. It is suggested that the controllable electrodeposition process can be used to prepare nano-iron films with various particle sizes from Fe2O3 in CHCl-EG eutectic melt.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yimeng Yang,Jiaqi Lou,Duo Qi,Chengji Zhao
The rapid development of wearable electronics is driving the exploration of flexible and transparent humidity sensors . However, the limited humidity response and mechanical flexibility of sensitive materials hinder the normal operation of the device. In this research, flexible humidity sensors with a fast response time (1 s) were prepared using transparent imidazolium-based hyperbranched poly(ionic liquid)s (HPIL). The sensor performance was improved by regulating the counter anions with different hydrophobicity , such as trifluoromethanesulfonimide ion (TFSI - ). The HPIL-TFSI sensor featured an improved response under low humidity condition (6%∼33% RH) with good linearity, excellent bending humidity response, mechanical stability , and long-term stability over a wide humidity range from 6% to 98% RH. Moreover, accurate sensing was achieved for respiratory monitoring, non-contact sensing, and detecting moisture on patched skin. The HPIL-TFSI sensor paves the way for the production of high-performance wearable sensor platforms.
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危险品化学品经营许可证（带存储）