JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Cai-bin Zhou,De-song Zhan
The extraction process of rhenium was investigated in the room-temperature ionic liquid 1-pentyl-3-methylimidazolium bis((trifluoromethane)-sulfonyl)imide ([C5mim][NTf2]) containing N235. At ionic strength ranging from 0.2 to 2.0 mol·kg–1 and temperatures ranging from 293.15 to 318.15 K, the molalities of perrhenate in the aqueous phase were obtained at an extraction equilibrium. The standard extraction constants K0 at diverse temperatures were gained by the Pitzer polynomial approximation method. Thermodynamic characters for the extraction procedure were calculated.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2015
·Vol. 308
·期 2
·573-578
·
IF 1.034
Xie Zong-Bo,Kang Hai-Tao,Chen Zhong-Sheng,Zhang Sui-Hong,Le Zhang-Gao
The extraction behavior of U(VI) from nitric acid medium by a solution of N , N -dimethyl- N , N -diphenylmalonamide (DMPMA) in the ionic liquid, BmimPF 6 , was studied. The extractability was measured as a function of various parameters such as kinetics, phase ratio, the concentration of DMPMA, nitric acid and sodium nitrate, alkyl chain length of ionic liquid. The extractability from 5 M nitric acid by 0.35 M DMPMA/BmimPF 6 was found to be almost 100 %. Slope analysis of the experimental data suggests that the probable molecular structure of the extraction species is [UO 2 NO 3 (DMPMA) 2 ] + , and the mechanism likely occurs by a cation exchange mode.
研究领域:
化学
·
核化学与放射化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·349-359
·
IF 3.431
Sun Ya Kun,Jia Man,Yang Jian,Huang Yan-Ping,Liu Zhao-Sheng,Aisa Haji Akber
A method of preparing molecularly imprinted polymers (MIPs) with Zn(II) as a metallic pivot was adopted to solve the problem of imprinting compound with intramolecular hydrogen bonds by forming stronger coordination binding interaction among the template–functional monomer-Zn 2+ complex. A ternary porogenic system including dimethyl sulfoxide, dimethylformamide, and room temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate was employed to fabricate imprinted monolith with high porosity and good flow-through properties, in which chicoric acid (CA), zinc acetate, 4-vinylpyridine (4-VP), and ethylene glycol dimethacrylate (EDMA) was the template, metallic ion, functional monomer, as well as crosslinker, respectively. The influence of polymerization factors including the 4-VP-CA ratio, monomer-crosslinker ratio, template-Zn 2+ ratio on imprinting factors was systematically investigated. When the ratio of 4-VP to CA was 24:1, the greatest IF value (24.81) was achieved on the CA-MIP prepared with zinc acetate. In addition, off-line SPE with the optimal MIPs monolith led to high purity of CA (98.0% ± 0.5%) from extraction of Cichorium intybus L. roots with the recovery of 77.5% ± 2.5% ( n = 6). As a conclusion, the strategy of introducing metal ions as metal pivot to prepare MIPs was a powerful method for the MIPs synthesis to the template molecules with intramolecular hydrogen bonds.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 6
·1261-1271
·
IF 3.286
Sun Ya Kun,Sun Guang-Ying,Jia Man,Yang Jian,Liu Zhao-Sheng,Huang Yan-Ping,Aisa Haji Akber
One of the main challenges in large-scale applications of molecularly imprinted polymers (MIPs) is the significant amount of template needed in polymer preparation. A new strategy based on room-temperature ionic liquids (RTILs) was suggested to solve this problem by reducing the amount of template in the polymerization recipe. The MIP was synthesized with a mixture of dimethyl sulfoxide and RTIL (1-butyl-3-methylimidazolium tetrafluoroborate) as porogen, in which chlorogenic acid (CGA) was used as template, 4-vinylpyridine (4-VP) as functional monomer, and ethylene glycol dimethacrylate (EDMA) as cross-linker. The influence of polymerization variables, including CGA concentrations, and the ratio of 4-VP to EDMA on imprinting effect were investigated comprehensively. Moreover, the properties involving the column permeability, the number of binding sites, and the polymer morphology of the CGA-MIP monoliths were studied thoroughly. The MIP monolith had an excellent column permeability (1.53 × 10 −13 m 2 ) and allowed an ultra-fast on-line SPE, which dramatically shortens the separation time (< 10 min) and improves the separation efficiency. At high flow velocity (5.0 mL min −1 ), 50 μL of the extract from Eucommia ulmoides leaves can be loaded directly on the CGA-MIP monoliths and CGA with high purity can be obtained with a recovery of 89.01 ± 0.05%. As a conclusion, the resulting RTIL-induced approach of preparing MIP may be an effective tool in fabricating MIP in a low-cost way.
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研究领域:
化学工程
·
药物化学
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产品关联
DOI
PubMed
高影响因子
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.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2014
·
IF 1.019
Ou Sha,Xiashi Zhu
A new simplified extraction of gold(III) using a room-temperature ionic liquid prior to determination by flame atomic absorption spectrometry has been developed. The extraction method uses 1-butyl-3-methylimidazolium hexafluorophosphate without a chelating agent. The parameters of the extraction system were investigated in detail. Under the optimized conditions, a linear range of 0.19 to 38.20 µg · mL−1, a limit of detection of 0.072 µg · mL−1, an enrichment factor of 10.0, and an extraction capacity of 6.6 mg · g−1 were obtained. The extraction mechanism and the selectivity of 1-butyl-3-methylimidazolium hexafluorophosphate for gold(III) were also investigated. The method was applied for the determination of gold(III) in water samples with satisfactory results.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Bing Liu,Yongzhong Jia,Zezheng Zhang,Huaxin Sun,Ying Yao,Yan Jing,Mixiang Qi,Quanyou Zhang
The solvent extraction separation of lithium isotopes has become of growing interest due to the need for 6 Li and 7 Li isotopes in the nuclear industry. A one-step synthesis of room temperature ionic liquid with low viscosity 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][NTf 2 ]) (with reaction yields of 87.47%) was used by the ultrasonic method. The addition of ionic liquid [EMIm][NTf 2 ] in the system significantly improved the extraction efficiency and separation factor compared to the traditional organic solvent anisole for extraction separation of lithium isotopes. The distribution ratio increased from 0.00145 (with the single stage separation factor of 1.024 ± 0.001) to 0.134 (with the single stage separation factor of 1.034 ± 0.001). Furthermore, a multi-stage extraction process was intended to enhance lithium isotope separation performance. Each stage of stripping can be considered as an extraction separation equilibrium process, in which the strip liquor from the load organic phase is used for separation in the next stage as the “original aqueous solution”. The abundance of 6 Li + gradually improved with an increase in the extraction stages. The relative abundance of 6 Li + increased by 1.492% at the 20-stage extraction separation (from 7.53% to 9.022%). This new and simple approach (stripping cross-flow multistage method (SCFM)) was to achieve large enrichment of lighter isotopes of lithium ( 6 Li + ) by combined extraction and stripping process. In summary, the present study offers the possibility for the enrichment of 6 Li + during lithium isotope extraction separation.
研究领域:
化学
·
核工业
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·8783-8790
·
IF 3.201
Xuezhi Dai,Xiaolian Qiang,Jing Gao,Juan Teng,Huimin Zang,Hang Song
Microemulsions with magnetic properties were formulated and optimized at 25 °C by using a series of pentaalkylguanidinium-based magnetic room-temperature ionic liquids (MRTILs) 1,1,3,3-tetramethyl-4-alkylguanidinium bromotrichloroferrate(III) [CnTMG][FeCl3Br] (n = 2, 4, 6, and 8) as a polar phase, different aliphatic oils as a nonpolar phase, and an optimal mixture of nonionic surfactant Triton X-100 (TX-100) and different short-chain aliphatic alcohols as a cosurfactant. The phase behaviors of these microemulsions were investigated by a cloud titration method. The results revealed that cyclohexane (as the nonpolar phase) coupled with TX-100/1-pentanol (mole ratio of 1 : 3) showed the best ability to formulate MRTILs-based microemulsions and the range of monophasic region was expanded with an increase in the length of alkyl chain attached to the NRH+ group of MRTILs cation. Based on conductivity measurements, the classical structural sequence of oil-in-MRTILs (O/MRTILs), bicontinuous sponge structure (BC), and inverse MRTILs-in-oil (MRTILs/O) microemulsions was observed with an increase of m(Oil)/m(MRTILs) ratio. Dynamic light scattering (DLS) and cryo-high resolution scanning electron microscopy (Cryo-SEM) measurements showed that microemulsion droplets with the size of about 3 to 7 nm were formed in the MRTILs/O subregions and the droplet size increased with an increase in the concentrations of MRTILs. Magnetic susceptibility and rheological measurements revealed that these MRTILs-based microemulsions had strong magnetic susceptibility and low viscosity over the entire optically clear range of composition. This comprehensive investigation provides useful information for formulating analogous MRTILs-based microemulsions and these magnetic microemulsions should have interesting potential applications by simply manipulating the external magnetic field.
研究领域:
化学
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材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Jun Jing,Zhiyong Li,Yuanchao Pei,Huiyong Wang,Jianji Wang
In this work, a series of novel room temperature ionic liquids (ILs) have been synthesized with cheap, naturally α-amino acid ester as cations and bis(trifluoromethylsulfonyl)imide as anion. The glass transition temperature and thermal decomposition temperature of these ILs, partition coefficients of some coumarins and purine alkaloids between water and the amino acid ester-based ILs at T = 298.15 K, and Gibbs energy, enthalpy and entropy changes for the transfer of caffeine and 6,7-dihydroxycoumarin from water to [LeuC 2 ][Tf 2 N] have been determined. It is shown that these ILs are highly effective materials for the extraction of drug compounds like coumarin, 4-hydroxycoumarin, 7-hydroxycoumarin, 3-aminocoumarin, coumarin-3-carboxylic acid, 6,7-dihydroxycoumarin, 6,7-dihydroxy-4-methylcoumarin, caffeine, theobromine, theophylline, inosine, and 2,6-diaminopurine. The partition process is driven by enthalpy term, and partition coefficients of the drug molecules increase with the increase of hydrophobicity of both the drug molecules and the ILs. Furthermore, the possible partition mechanism has been investigated from 13 C NMR measurements.
研究领域:
药学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 20
·4951-4958
·
IF 5.256
Xiaofeng Sun,Keyang Yin,Baoyong Liu,Shengju Zhou,Jiamei Cao,Geping Zhang,Hongguang Li
Carbon quantum dots (CQDs) have appeared as attractive photoluminescent (PL) materials that overcome the poor photostability of organic dyes and the environmental hazards of heavy metal-containing quantum dots. Engineering CQDs into PL inks that can find applications in anti-counterfeiting and information encryption is promising. However, current methodologies are limited by several disadvantages, including blocking of the writing/printing tools caused by the slow evaporation of the solvent and the aggregation-induced quenching of CQDs in their dry state, when practical applications are concerned. Herein, a new generation of CQD-based PL inks applying room-temperature ionic liquids (RTILs) as the solvent was prepared. The concept presented herein relies on functionalizing the CQDs with the same or similar cationic moieties as those involved in RTILs and facilely obtaining the PL inks through a one-step phase transfer of the as-prepared water-soluble CQDs to the hydrophobic RTILs. The so-obtained CQDs/RTILs inks are highly photoluminescent and compatible with most commonly used writing and templating tools including gel ink pens, brush pens and stamps. Letters or patterns obtained by these PL inks show impressive photostability under various harsh conditions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2013
·Vol. 57
·期 3
·397-401
·
IF 1.327
Zhang QiBo,Hua YiXin,Wang Rui
Direct electroreduction of solid cuprous chloride to prepare copper powder in a “neutral” ambient-temperature ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (BMIMBF 4 ) was investigated. Cyclic voltammetry of the CuCl powder in a Pt-powder cavity microelectrode exhibited that solid CuCl can be electrochemical reduced in the ionic liquid. Chronoamperometry of the salt powder filled Mo-cavity electrode (current collector) in the ionic liquid further demonstrated the conversion of chloride-to metal inside the cavity, as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra.
研究领域:
电化学
·
材料科学
·
无机化学
·
绿色化学
·
冶金工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 61
·16407-16417
·
IF 5.16
Ting Chen,Yanqiao Xu,Lianjun Wang,Weihui Jiang,Wan Jiang,Zhixiang Xie
Graphical Water-soluble quantum dots (QDs) consisting of Cu-In-Zn-S (CIZS) have been prepared by microwave treatment with the assistance of room-temperature ionic liquid. During the process, the instantaneous nucleation rate can be improved, which results in the rapid synthesis of CIZS QDs at low temperature. The weakly coordinating BF 4 − is prone to produce F − , which can passivate the surface dangling bonds effectively and thereby improve the photoluminescence (PL) intensity significantly. A facile approach towards photoluminescent (PL) Cu-In-Zn-S quantum dots (CIZS QDs) has been developed, comprising microwave treatment with the assist of room-temperature ionic liquid (RTIL). Because of its high polarizability, RTIL served as a microwave absorbent, which resulted in the increase of the instantaneous nucleation rate and the rapid synthesis of CIZS QDs at low temperature. Moreover, the surface decoration of QDs with RTIL can passivate the surface defects greatly. The PL intensity of the CIZS QDs depends on the anion species, alkyl chain length of the RTIL, and the metal element ratios of the QDs. On the basis of the variable PL peak position and extended luminescence lifetime of the CIZS QDs, the superior emission behavior of the QDs was confirmed by surface etching with fluoride produced by the hydrolysis of RTIL 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ). Moreover, the intermediate alkyl chain length of the RTIL can avoid aggregation, which results in the construction of CIZS QDs with homogenous size distribution. The shape-controlled CIZS QDs show a broadened tunable emission peak from 677 to 579 nm compared with that of QDs prepared by a conventional one-pot method by mixing the raw materials. CIZS QDs also exhibit a high quantum yield (QY) of 24.1 % after coating with a ZnS shell. This method is expected to be a useful technique for the rapid synthesis of multiple QDs with a wider range of emission wavelengths and higher QY for a variety of applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）