Separations
·
2021
·Vol. 8
·期 11
·216
·
IF 2.777
Zhaojin Zhang,Yinan Li,Jing Gao,Alula Yohannes,Hang Song,Shun Yao
Based on above background, quinolinium, 8-hydroxy-quinolinium, and benzothiazolium ionic liquids, containing the acidic anions of methanesulfonate ([CH3SO3]−), phosphate ([H2PO4]−),p-toluenesulfonate ([p-TSA]−), and bisulfate ([HSO4]−) were synthesized. After comparison, the aqueous solution of benzothiazole bisulfate [HBth][HSO4] was selected as the most ideal extractant for removing pyridine and aniline. Meanwhile, benzothiazole bisulfate [HBth][HSO4] solution was found as the best one for removing quinoline from simulated oil. Then, the single stage extraction and two-step extraction were used in the extraction for the simulated oil containing pyridine, quinoline or aniline, and their mixture, respectively. Their denitrogenation performance on their N-removal effect was compared on the basis of structural features, and main extraction conditions were further investigated, including mass ratio of IL to water, mass ratio of IL to oil, and temperature. Furthermore, the extraction process was described by two kinetic equations. Recovery and reuse of IL were realized by back-extraction and liquid-liquid separation, and a related mechanism was speculated, according to all the experimental results. Finally, based on the developed method for preparing complex adsorbent tablets, corresponding immobilized IL was used to remove target objects, by solid phase extraction, in order to extend separation ways, which was more easily recovered after extraction.Keywords:ionic liquids;denitrogenation;extraction;pyridine;quinoline;aniline;simulated oil
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4337-4345
·
IF 3.3
Zhangbin Liao,Yunlong Duan,Liying Guo,Rongrong Zheng,Liyan Wang,Yanming Chen,Linnan Zhang,Xin Qian
Five titanium-centered heteropoly acids with different metal vacancies were prepared first, and then combined with an ionic liquid by ion exchange to prepare heteropoly acid ionic liquid catalysts Bmim4–6[M(H2O)TiMo11O39] (M = Cu2+, Fe2+, Pb2+, Ti4+, and Zn2+). The structure and thermal properties of each catalyst were tested and analyzed by Fourier transform infrared (FTIR) spectroscopy, ultraviolet (UV) spectroscopy, X-ray powder diffraction (XRD), apparent morphology analysis, and thermogravimetric analysis (TGA). Five heteropoly acid ionic liquids were investigated by using waste mineral water bottles as samples for performance in the catalytic degradation of bottle-grade polyethylene terephthalate (PET), and the degradation product, bis(2-hydroxyethyl) terephthalate (BHET), was analyzed for the chemical structure. The results showed that the five heteropoly acid ionic liquid catalysts were successfully prepared, with good thermal stability. Of these catalysts, Bmim4[Ti(H2O)TiMo11O39] showed the optimal catalytic performance. It achieved an alcoholysis rate of 100% and a yield of BHET of 84.73% with a catalyst dosage of 0.6% (percentage in the total mass of the raw materials) at 190 °C for 5 h. Moreover, after six cycles of use, the alcoholysis rate was still as high as 94.36%, and the yield of BHET was 75.65%. The above results indicated that the prepared heteropoly acid ionic liquid catalysts showed good performance in the catalytic degradation of bottle-grade PET, presenting a promising prospect for development.
研究领域:
化学
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yiru Gao,Yanan Hao,Wenxin Zhang,Yanan Wei,Yang Shu,Jianhua Wang
Phototherapy still lacks effectiveness in treating tissue infections due to poor penetration depth of light and laser-induced non-specific thermal diffusion. Microwave thermal therapy (MWTT) is advantageous as characterized by strong tissue penetration, and higher heating rate. In addition, transdermal delivery of drugs helps in the treatment of tissue infections. Herein, we present an all-in-one MW-therapeutic hydrogel for eradicating bacterial infections with transdermal drug delivery. A microwave-responsive ionic liquid (IL), i.e., vinylbenzyl trimethylammonium chloride (VBTMACl), and a transdermal-enhancer IL, i.e., [2-(methacryloyloxy)ethyl] trimethylammonium chloride (ChMACl), are copolymerized with acrylic acid (AA) to form the hydrogel VACPHs. Polyvinylpyrrolidone (PVP) is incorporated with VACPHs to improve their mechanical stability. The model drug levofloxacin (LEVO) is subsequently loaded into the hydrogel, and the VACPHs-LEVO shows strong antibacterial effect. It is attributed to the efficient microwaveocaloric therapy of VBTMACl and enhanced transdermal antibiotic delivery by ChMACl. The drug delivery hydrogel developed in this research exhibits excellent performance for the treatment of deep tissue infections.
研究领域:
生物医学工程
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药剂学
·
治疗学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 2
·315-324
·
IF 3.815
Luo Huan,He Xi,Liu Gang,Niu Yan-Hua,Li Guang-Xian
The dynamic behavior of entangled poly(methyl methacrylate) (PMMA) chains in both the traditional monocationic ionic liquid (MIL) and synthetic dicationic ionic liquid (DIL) with the same anion bis[(trifluoromethyl)sulfonyl]imide ([TFSI] − ) has been examined over the wide composition range using differential scanning calorimetry and rheological measurements. PMMA/DIL and PMMA/MIL systems exhibit two glass transitions in the midrange of composition due to self-concentration effects. PMMA in DIL shows slower relaxation behavior, however, after the iso-free-volume correction, the terminal relaxation time τ 0 of PMMA in both the DIL and MIL presents the power law behavior τ 0 ∼ ϕ v with exponent v conforming to experimental results for conventional polymer solutions ( v =2.0±0.2). At high ILs concentration (70%), the entanglement molecular weight M e of PMMA/DIL system is lower than that of PMMA/MIL system owing to the formation of additional physical network in DIL, while the difference of M e is reversed at low ILs content. The composition dependence might be related to the fact that the probability of formation of physical cross-linking points in linked double imidazolium ring increases with the increase of DIL content. The recovered creep strain of PMMA/DIL is almost 18 times of PMMA/MIL, exhibiting significantly better viscoelastic behavior.
研究领域:
高分子科学
·
材料科学
·
化学物理
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4198-4211
·
IF 3.925
Na Liu,Juan Teng,Alula Yohannes,Hang Song,Shun Yao
For the extraction of theophylline from a water phase, four hydrophobic ionic liquids (ILs) were designed and synthesized which included various amino acid ester cations and the same bis(trifluoromethyl)sulfonimide anion. After screening, L-phenylalanine ethyl ester bis(trifluoromethyl)sulfonimide ([PheC2][Tf2N]) showed the highest distribution coefficient and it was then applied to further investigations focused on the extraction conditions. It was also immobilized through a simple procedure and used for the adsorption of theophylline for comparison. The new sorbent was characterized via infrared spectroscopy (IR), scanning electron microscopy (SEM), elemental analysis, thermogravimetric analysis, and particle size analysis. In addition, thorough investigations into the adsorption conditions, kinetics, isotherms, and thermodynamics were carried out, together with selective separation studies. The post-treatment and reuse of the IL were also explored using the two separation approaches. A comprehensive comparison was made between these approaches and reported methods.
研究领域:
化学
·
药学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Fan Zhang,Yong Li,Lele Zhang,Zhiyong Zhou,Wei Sun,Zhongqi Ren
The separation of aromatics and aliphatic hydrocarbons is one of the most challenging and energy consuming operations in the petrochemical industry. In this study, two ionic liquids (ILs), N-benzyl-N-methylimidazoium bis(trifluoromethylsulfonyl)imide (IL-a) and N-benzyl-N-vinylimidazolium bis(trifluoromethylsulfonyl)imide (IL-b), were synthesized. Six ternary systems, i.e., toluene–heptane–IL (IL-a or IL-b), benzene–hexane–IL (IL-a or IL-b), and benzene–cyclohexane–IL (IL-a or IL-b), were studied in terms of both quantum chemical calculation and liquid–liquid extraction (LLE). The quantum calculation results showed that both ILs had stronger interaction with aromatics than that with alkanes. For both ILs, stronger binding energy was obtained with toluene than that with benzene. The liquid–liquid extraction experiments were conducted at 298.2 K and atmospheric pressure. The distribution coefficients of aromatic compounds (benzene and toluene) were over 0.72 when IL-a was used as extractant and above 0.75 when IL-b was used. When IL-a was used in the ternary system with benzene and hexane, the selectivity was more than 30, and the distribution coefficient of benzene was over 2.2. Both ILs could be reused more than 10 times without significant loss of selectivity and decrease of distribution coefficients. Better separation performance was obtained at 298.2 K than that at 318.2 K. Another three ternary systems with long-chain alkanes were also tested. Experimental LLE data of these studied ternary systems could be correlated adequately using the NRTL thermodynamic model.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Nuclear Engineering and Technology
·
2021
·
IF 2.341
Hao Wu,Tatsuya Kudo,Seong-Yun Kim,Misako Miwa,Shigeo Matsuyama
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C 2 mim + NTf 2 − ) as the materials to remove cesium(I) (Cs + ) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs + ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs + adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs + and C 2 mim + . In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs + ion species on the adsorbent was in the form of both CsCl and CsBr.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Yue Wang,Xiaohe Wang,Saisai Wang,JiaWei Zhao,Yang Wu,Tao Zhang,Zhigang Zhang,Wenxiu Li
There is a large amount of ethanol (EtOH) and a small amount of furfural (FF) in the ethanol pulping waste liquid. How to separate FF, a high value-added product, efficiently and cleanly and at the same time recover EtOH effectively and save energy is an urgent problem. This article describes the phase equilibrium process of extracting FF from wood pulp waste liquor by ionic liquids (ILs) 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6])/1-pentyl-3-methylimidazolium hexafluorophosphate ([PMIM][PF6]) as the extractant. Two ILs have excellent distribution coefficients (D) and selectivity (S) for FF, which can separate EtOH and FF well. A set of extraction performance evaluation methods based on the COSMO-RS model, liquid–liquid extraction method, and NRTL simulation were proposed. Combined with quantum chemical calculations such as interaction energy (ΔE), electrostatic potential analysis, and interaction region indicator, analysis of internal interaction and extraction mechanism between different molecules is realized.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Kun Yue,Jiani Lu,Peiyu Chen,Shaonan Gu,Guowei Zhou
Vapor–liquid equilibrium (VLE) data for the ternary system of acetonitrile + ethanol + ionic liquids (ILs) were obtained at 101.3 kPa, and used ILs were 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf2]), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][NTf2]), and 1-butyl-3-methylimidazolium diethylphosphate ([BMIM][DEP]). The nonrandom two-liquid (NRTL) model was used to correlate the VLE data and fitted well, indicating that the minimum mole fractions of [BMIM][NTf2], [EMIM][NTf2], and [BMIM][DEP] to eliminate the azeotrope was 0.053, 0.063, and 0.065, respectively. These ILs led to an outstanding “salting-in” effect on ethanol, and the salting effect on acetonitrile was inapparent. Higher concentrations of ILs signified a stronger salt effect as well as higher equilibrium temperatures. The results indicated that [BMIM][NTf2], [EMIM][NTf2], and [BMIM][DEP] could be used as good candidate entrainers to separate acetonitrile and ethanol in extractive distillation.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Mengping Liu,Ling Zhu,Xiaoxian Zhang,Wenhui Han,Yuping Qiu
The association of the cation and anion of ionic liquids (ILs) dominates the absorbability of ILs by activated carbon (AC). Nevertheless, the mechanism behind the role of ion-pairs is largely unknown. In this study, the adsorption of a series of imidazolium derivative-based ILs by AC was involved in response to the octanol-water partition coefficient ( K OW ), hydrogen bonding acidity ( α ), ion-pair binding constants ( K IP ), binding energy of ion-pairs ( E binding ) and density functional theory (DFT) calculation of ILs. A significant positive correlation between lg K OW and K d and between K IP and lg K OW was observed ( p < 0.05). However, both E binding and α was inversely proportional to K IP . Hence, the substitution of oxygen-containing functional groups, such as carboxyethyl, 1-methoxyethyl, and 1-(ethoxycarbonyl)methyl, on imidazolium ring enhanced the hydrogen bond interaction with water molecules and then weakened the binding of imidazolium cation and [NTf 2 ] − , thereby reducing the adsorption of ILs to AC. DFT calculation further revealed that the polar substitution improved the electron density and electronegativity of imidazolium skeleton. By contrast, the ILs functionalized with non-polar groups (e.g., butyl, allyl , and benzyl) generally displayed high K IP values and low α values. Consequently, the formation of hydrogen bond between the oxygen-containing functional groups of IL cation and water would facilitate the dissociation of IL ion-pairs and then decrease the adsorption of ILs on AC.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
World Journal of Engineering
·
2014
·Vol. 11
·期 3
·271-278
·
IF 0
Leqin He,Jiquan Zhao,Shenjun Qin,Tao Chang,Yuecheng Zhang,Guangqing Zhang,Xiaorui Gao
Five halogen-free amphiphilic Brønsted acidic ionic liquids (ILs) based on 3-(N,N-dimethylalkylammonium)-propanesulphonate quaternary ammonium zwitterions andp-toluene sulphonic acid monohydrate were synthesized. The IL structures were characterized using1H NMR,13C NMR and (ESI)-MS. The IL thermal instability was characterized using TG-DSC. The ILs were used as dual-solvent catalysts for esterification of several carboxylic acids, with different alcohols under mild conditions to study relevant structure-activity relationships. Results showed that the miscibility of the acidic IL, which is affected by the length of the carbon chain in the cation, is an important factor influencing the activity of the catalyst for the esterification reaction. Post-processing steps were simple, and the catalyst could be reused easily.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Fenghua Geng,Rui Zhang,Luo Wu,Zheng Tang,Han Liu,Haiyan Liu,Zhichang Liu,Chunming Xu,Xianghai Meng
N -alkyl imidazolium carbonate ionic liquids were employed to separate and recover naphthenic acid from model oils. The effects of the cationic and anionic structures of ionic liquids and operating conditions on the deacidification performance were investigated. The deacidification performance of traditional organic solvents was also investigated for comparison. The results indicated that the naphthenic acid could be completely removed from the model oil with a small mass ratio of ionic liquid to oil. The extracted naphthenic acid was regenerated with a recovery of up to 92%. In addition, imidazolium carbonate ionic liquids could be successfully regenerated and recycled. The mechanism of interaction between imidazole ionic liquids and the naphthenic acid molecules were explained by Gauss calculation.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）