INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Pan Sun,Kun Huang,Weiyuan Song,Zhen Gao,Huizhou Liu
An ionic-liquid-based aqueous two-phase system (iL-ATPS) consisting of an ionic liquid, tributylmethylammonium nitrate (N4441NO3), and NaNO3 aqueous solutions was developed for the extraction and separation of rare-earth ions, for example Nd(III), from transition-metal ions. The excellent selectivity of a green nonfluorinated ionic liquid and the low-viscosity feature of an aqueous two-phase system were combined in our suggested iL-ATPS. The results indicated that efficient separation of Nd(III) from transition-metal ions, Fe(III), Ni(II), and Co(II), could be obtained in our suggested iL-ATPS. Furthermore, different parameters of the separation process, including the concentrations of HNO3 and NaNO3 and the added amount of N4441NO3, were optimized. Notably, the extraction kinetics of Nd(III) could be improved significantly in the present iL-ATPS compared with the conventional organic-solvent-based ionic-liquid extraction systems. The similar environment across the liquid–liquid interface was revealed by the ultralow viscosity and interfacial tension of the ionic-liquid-rich phase in the iL-ATPS. This feature was responsible for the enhanced extraction kinetics of Nd(III). In addition, the structures of the extraction complexes were elucidated by using NMR spectroscopy and molecular simulations. It was demonstrated that NO3– ions were in the inner coordination shell of Nd(III) ions to interact with Nd(III) ions, while N4441+ surrounded Nd(III) ions at the outer coordination shell of Nd(III) ions. Moreover, 2 mol/L HNO3 aqueous solutions could be used to effectively strip Nd(III) from the loaded ionic-liquid-rich phase. After 5 cycles, the extraction performance of the ionic liquid remained nearly unchanged. The present work highlights an environmental method to selectively separate rare-earth ions from the complicated solutions coexisting with other transition-metal impurity ions. It provides a basis for the future application in recycling of rare-earth elements from the spent NdFeB magnets.
研究领域:
环境化学
·
湿法冶金
·
可持续回收
·
分离科学
·
稀土元素
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Meiling Lei,Jing Sun,Yu Chen,Zixian Cai,Yimin Hu
The hydrotalcites were dispersed in the hexagonal lyotropic liquid crystals (LLCs) composed of 1-hexadecyl-3-alkyl imidazolium bromide ([C 16 imC n ]Br, n = 1, 2 and 3) and H 2 O. The effects of the hydrotalcite concentration and the alkyl chain length of the [C 16 imC n ]Br on the properties and the lubricant performance of the [C 16 imC n ]Br/hydrotalcite hexagonal LLCs were studied by small angle X-ray diffraction measurements, rheology and tribology. Compared with the pure hexagonal LLCs, the incorporation of hydrotalcite into the [C 16 imC n ]Br hexagonal LLCs can increase the interlayer distances and the viscoelasticity of the hybrid hexagonal LLCs gradually. However, the friction coefficient and wear volume decrease firstly and then increase with the increasing of hydrotalcite content. With the increase of the alkyl chain length of the [C 16 imC n ]Br, the viscoelasticity, the interlayer distance and the water permeability of the mixed LLCs gradually increase which decreases the friction coefficient and wear volume at the moderate hydrotalcite content. The mechanism of the effective improvement of lubrication performance of the hybrid hexagonal LLCs is the tribofilm formed by the physical adsorption and tribochemical reaction of [C 16 imC n ]Br/hydrotalcite LLCs on the steel surface.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2021
·
IF 2.329
Lei Xu,Jing Lu,Weiqi Meng,Fengjuan Cui
Micellar electrokinetic chromatography (MEKC) with ultraviolet detection was employed for the simultaneous determination of the nucleoside reverse transcriptase inhibitors lamivudine, stavudine and didanosine with the ionic liquid-based cationic surfactant 1-tetradecyl-3-methylimidazolium bromide ([C14MIm]Br) as the pseudostationary phase. The composition, pH, and concentration of running buffer, surfactant concentration, separation voltage, and injection time were optimized. In comparison with conventional cationic surfactants, improved separation was observed using [C14MIm]Br. The applicability of the method was demonstrated by the analysis of human urine. The method exhibited wide linear ranges with limits of quantitation of 0.5, 0.3, and 1.0 μg/mL for lamivudine, stavudine, and didanosine, respectively. The intra-day and inter-day accuracies were from 91.5% to 114.0%. The precision, expressed as relative standard deviation (RSD), was less than 12.6% for the peak area. The recoveries of the analytes in the samples were between 91.8% and 97.3%. This approach is convenient, rapid, and economical for these analytes in biological samples.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Xi Ying,Du Yingxiang,Sun Xiaodong,Zhao Shiyuan,Feng Zijie,Chen Cheng,Ding Wen
A monolithic capillary column was prepared by single-step copolymerization of the ionic liquid 1-vinyl-3-octylimidazolium bromide (VOI) and styrene. The VOI and styrene monomers were introduced to provide multiple interaction sites and increase hydrophobicity and aromaticity of the monolithic column, respectively. The effect of porogen ratio, monomer ratio and reaction temperature on permeability was investigated. The resulting column was characterized by scanning electron microscopy, and the results suggest that the column possesses high porosity and good homogeneity. A relatively strong anodic electroosmotic flow was generated over a wide range of pH values (pH 2.0–10.0), and this facilitates the rapid separation of analytes within 12 min. Alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs), proteins and amino acids were used to evaluate the performance of the monolithic column under capillary electrochromatography mode by UV detection. Mixed-mode retention mechanisms including hydrophobic interaction, π-stacking, ion-exclusion interaction were observed. The monolithic column exhibits high column efficiency (8.72 × 10 4 plates∙m −1 ) and satisfying separation capability (the resolution of four alkylbenzenes: 2.54, 2.86 and 4.62, four PAHs: 2.79, 4.83 and 4.77, three proteins: 4.35 and 2.86, two amino acids: 3.34).
Schematic representation of capillary electrochromatography (CEC) systems with ionic liquid and styrene based organic polymer monolithic column for separation of alkylbenzenes, polycyclic aromatic hydrocarbons, proteins and amino acids.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Jingping Liu,Pan Huang,Qing Feng,Peng Lian,Yipu Liang,Wenjian Huang,Hui Yan,Han Jia
A typical anionic surface active ionic liquid (SAIL), 1-butyl-3-methyl-imidazolium dioctylsulfosuccinate (BMOT), was introduced to chemical enhanced oil recovery. The ability of BMOT to reduce the interfacial tension (IFT) of water/crude oil was evaluated for its potential application in surfactant flooding. Compared with the traditional anionic surfactant AOT and another anionic SAIL 1-butyl-3-methylimidazolium dodecyl sulfate used in the control experiments, the effects of intramolecular electrostatic attraction and size match were employed to interpret the high interfacial activity of BMOT. The effects of salt and temperature on the water/crude oil IFT further verified the proposed mechanisms. Moreover, BMOT exhibited a satisfactory displacement performance to greatly improve the crude oil recovery (12.5% of the initial oil in place) in core flooding tests.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-10
·
IF 5.479
Zhao Shiyuan,Yu Tao,Du Yingxiang,Sun Xiaodong,Feng Zijie,Ma Xiaofei,Ding Wen,Chen Cheng
The preparation of an organic polymer monolithic column modified with an amino acid ionic liquid and graphene oxide (AAIL-GO) and its application to capillary electrochromatography (CEC) was described. The AAIL tetramethylammonium-L-arginine was bonded to a monolithic column that was previously modified with graphene oxide by using an hydrochloride/N-hydroxysuccinimide coupling reaction. The morphology of a poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolith was examined by scanning electron microscopy. The incorporation of AAIL and graphene oxide was detected by infrared spectroscopy and elemental analysis. The resulting monolithic column produced a strong and stable electroosmotic flow from the anode to the cathode in the pH range from 3 to 9. Compared with a column modified with AAIL or graphene oxide only, the AAIL-GO-modified column has a better separation ability for amino acids, β-blockers, and nucleotides (the resolution of three amino acids: 2.231 and 2.036, β-blockers: 2.779 and 2.470 and nucleotides: 8.345 and 3.321). Molecular modeling was applied to demonstrate the separation mechanism of small molecules which showed a good support for experimental results.
Schematic representation of capillary electrochromatography (CEC) systems with an amino acid ionic liquid-graphene oxide modified organic polymer monolithic column as stationary phases for separation of amino acids, β-blockers, and nucleotides.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·95283-95291
·
IF 3.289
Lu Hu,Heng Qian,Xiaoling Yang,Songqing Li,Sanbing Zhang,Runhua Lu,Wenfeng Zhou,Haixiang Gao
A novel and simple method for effervescence-assisted dispersive liquid–liquid microextraction based on the solidification of a floating ionic liquid using a special collection method combined with high-performance liquid chromatography is developed for the determination of four benzoylureas in water samples. In this method, the ionic liquid (IL), trihexyl(tetradecyl)phosphonium tetrafluoroborate, is used rather than organic drops, which have limitations, as the extraction solvent for the first time in dispersive liquid–liquid microextraction based on the solidification of floating organic drops (DLLME-SFO). Due to the high viscosity of the IL, it can be quickly collected in the lid of the centrifuge tube after solidification, which combines the advantages of both dispersive liquid–liquid microextraction and liquid phase microextraction based on the solidification of a floating IL. Furthermore, effervescence is used to disperse the IL, thereby avoiding the use of an organic dispersant. The influence of various experimental factors, such as the form of the effervescent material, IL quantity, base to acid ratio in the effervescent tablet, weight ratio of IL to effervescent tablet, ultrasonication time, centrifugation time, extraction temperature, sample pH, extraction time and salt addition, are optimized using a central composite design and the one-factor-at-a-time approach. Under the optimal conditions, good linearity was obtained for the four BUs from 2 to 500 μg L−1, with correlation coefficients ranging from 0.9994 to 0.9995. The recoveries were 90.2–100.2% with relative standard deviations ranging from 1.3–4.4%. The limits of detection for the analytes were between 0.77 to 1.58 μg L−1, and the enrichment factors ranged from 206 to 228. Additionally, this method was successfully applied for the determination of four BUs in real water samples.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Huixiang Yan,Xiaodi Tang,Xudong Zhu,Yanbo Zeng,Xing Lu,Zhengzhi Yin,Yixia Lu,Yiwen Yang,Lei Li
Herein we report a sandwich-type electrochemical immunosensor for sensitive detection of cardiac troponin I (cTnI) using a new composite of carboxyl-terminated ionic liquid and helical carbon nanotubes (CIL-HCNTs) as platform and ferrocenecarboxylic acid (Fc-COOH) as signal label. The composite of CIL-HCNTs was prepared by a simple and convenient one-step ultrasound method and was then characterized by Fourier transform infrared spectroscopy, scanning electron microscope, cyclic voltammetry and chronocoulometry. CIL-HCNTs, possessing large surface area and high electrical conductivity, provide a good platform for anti-cTnI monoclonal antibody immobilization through the carboxyl groups of CIL-HCNTs. The Fc-COOH, as a signal label based on the oxidation process, was combined with the CIL-HCNT platform to construct the electrochemical immunosensor for cTnI determination. Under optimal conditions, the electrochemical immunosensor exhibited desirable performance for cTnI determination with a wide range of linearity from 0.01 to 60.0 ng mL −1 and a relatively low detection limit of 0.006 ng mL −1 . Importantly, the immunosensor showed excellent specificity and acceptable reproducibility as well as satisfactory reliability for human serum sample analysis.
✓ 已验证
DOI
高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2019
·Vol. 30
·期 4
·973-984
·
IF 2.125
Wang Ting,Zhou Qingcheng,Ren Xiaoyu,Zhou Yunshan,Zhang Lijuan,Shehzad Farooq K.,Iqbal Arshad
Single wall carbon nanotube substituted ionic liquids were synthesized successfully by esterification reaction of the carboxylated single wall carbon nanotubes (SWNTs) with hydroxyl ammonium ionic liquids (ILs) of the formula CH 3 N(CH 2 CH 2 OH) 2 (C n H 2n+1 )Br (n = 4, 8, 12), which subsequently reacted with molybdophosphoric acid (PMo 12 ) to form three new ternary composite materials (SWNTs-ILC n -PMo 12 ) (n = 4, 8, 12). The composites modified glass carbon electrodes were used to study electrochemical properties systematically through cyclic voltammetry method. The results showed that electronic conductivity of SWNTs moiety and ionic conductivity of ILs moiety in the composite materials played important roles in the electrochemistry and electrocatalysis. The length of alkyl carbon chain of the ionic liquids in the composite materials was also found to influence the electrochemical properties. The experimental results also showed that all the composites modified electrode can catalytically reduce and detect IO 3 − , BrO 3 − and NO 2 − with very high efficiency (low detection limit, short response time and wide linear range).
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 43
·36223-36230
·
IF 3.289
Lu Hu,Wanyu Shan,Ying Zhang,Songqing Li,Haixiang Gao,Runhua Lu,Sanbing Zhang,Wenfeng Zhou
A novel liquid phase microextraction method based on the solidification of floated ionic liquids (SFIL-LPME) was developed to determine four phthalate esters (diethyl phthalate, diallyl phthalate, benzyl butyl phthalate, and dicyclohexyl phthalate) in environmental waters and bottle beverages and subsequently separate them using high-performance liquid chromatography. In this work, we customized a tributyldodecylphosphonium tetrafluoroborate ([P4 4 4 12][BF4]) ionic liquid (IL) to obtain a low density such that it can be solidified at a low temperature, and then used as an extraction solvent in liquid-phase microextraction based on the solidification of floated organic drops (SFO-LPME). This means that more potential ILs can be customized to broaden extraction solvents in SFO-LPME. To identify the significant factors that affect extraction efficiency, parameters such as the volume of [P4 4 4 12][BF4], the extraction time, the rotation speed, the extraction temperature and the ionic strength were optimized using a Plackett–Burman design. A central composite design was then used to optimize the identified significant factors to study the effect of interactions on the experiment. Under these optimized conditions, the extraction recoveries of the four phthalate esters in water samples ranged from 73.0 to 94.6% and in bottled beverage were from 70.2 to 101.3%, with relative standard deviations (RSDs) ranging from 0.6 to 8.2% and 0.6 to 7.8%. Good linearity for both water samples and bottled beverages were obtained in the range of 5–500 μg L−1, with correlation coefficients greater than 0.9993. The limits of detection for the four phthalate esters varied from 0.27 to 1.1 μg L−1 for water samples and 1.22 to 2.36 μg L−1 for bottled beverages. The two developed methods were then successfully applied to the determination of phthalate esters in environmental waters and bottled beverages.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2014
·
IF 4.258
Mei-Qiang Cai,Xiao-Qing Wei,Chun-Hui Du,Xu-Ming Ma,Mi-Cong Jin
A novel amphiphilic polymeric ionic liquid membrane containing a hydrophilic bromide anion and a hydrophobic carbonyl group was synthesized in dimethylformamide (DMF) systems using the ionic liquid 1-butyl-3-vinylimidazolium bromide (BVImBr) and the methylmethacrylate (MMA) as monomers. The prepared amphiphilic ploy-methylmethacrylate-1-butyl-3-vinylimidazolium bromide (MMA-BVImBr) was characterized by a scanning electron microscope and an infrared spectrum instrument. The results of solid-phase micro-extraction membrane (SPMM) experiments showed that the adsorption capacity of membrane was about 0.76 μg μg −1 for aniline. Based on this, a sensitive method for the determination of trace aniline, as a degradation product of azo dye Orange G under sonication, was developed by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The calibration curve showed a good linearity ranging from 0.5 to 10.0 μg L −1 with a correlation coefficient value of 0.9998. The limit of quantification was 0.5 μg L −1 . The recoveries ranged from 90.6% to 96.1%. The intra- and inter-day relative standard deviations were less than 8.3% and 10.9%. The developed SPMM-LC–MS/MS method was used successfully for preconcentration of trace aniline produced during the sonication of Orange G solution.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Xiaoling Yang,Kexin Qiao,Fang Liu,Xiaoling Wu,Miyi Yang,Jing Li,Haixiang Gao,Sanbing Zhang,Wenfeng zhou,Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C 16 mimBr-coated attapulgite/polyaniline-polypyrrole/Fe 3 O 4 (ATP/PANI-PPY/Fe 3 O 4 ) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples. ATP/PANI-PPY/Fe 3 O 4 nanocomposites were successfully synthesized using a one-pot method. The as-prepared nanocomposite sorbents were characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental factors affecting the extraction efficiency including the sorbent type, amount of ATP/PANI-PPY/Fe 3 O 4 nanocomposites, volume of ILs , sonication time, pH, and desorption conditions were optimized. Under the optimal conditions, good linearity was observed for all target analytes, with correlation coefficients (r 2 ) ranging from 0.9994 to 0.9999; the limits of detection (LOD) were in the range of 0.16–0.57 μg L −1 , and the recoveries of analytes using the proposed method ranged between 88.67% and 95.10%. The sorbents exhibited excellent repeatability in the range of 1.83–4.24% in extracting the three target analytes. In addition, the intra-day and inter-day precision values were found to be in the range of 0.19–6.24% and 2.23–8.36%, respectively. The method was successfully applied to analyze fruit juice samples by rapid preconcentration of acaricides.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）