ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Xiangyang Yu,Yanying Wang,Xuemin Chen,Kangbing Wu,Danchao Chen,Ming Ma,Zhenjia Huang,Wangze Wu,Chunya Li
ZnCdHgSe quantum dots (QDs) functionalized with N-acetyl-l-cysteine were synthesized and characterized. Through layer-by-layer assembling, the ZnCdHgSe QDs was integrated with a polymerized 1-decyl-3-[3-pyrrole-1-yl-propyl]imidazolium tetrafluoroborate (PDPIT) ionic liquid film modified indium tin oxide (ITO) electrode to fabricated a photoelectrochemical interface for the immobilization of rabbit antihuman neuron specific enolase (anti-NSE). After being treated with glutaraldehyde vapor and bovine serum albumin successively, an anti-NSE/ZnCdHgSe QDs/PDPIT/ITO sensing platform was established. Simplely using a white-light LED as an excitation source, the immunoassay of neuron specific enolase (NSE) was achieved through monitoring the photocurrent variation. The polymerized ionic liquid film was demonstrated to be an important element to enhance the photocurrent response of ZnCdHgSe QDs. The anti-NSE/ZnCdHgSe QDs/PDPIT/ITO based immunosensor presents excellent performances in neuron specific enolase determination. The photocurrent variation before and after being interacted with NSE exhibits a good linear relationship with the logarithm of its concentration (log cNSE) in the range from 1.0 pg mL–1 to 100 ng mL–1. The limit of detection of this immunosensor is able to reach 0.2 pg mL–1 (S/N = 3). The determination of NSE in clinical human sera was also demonstrated using anti-NSE/ZnCdHgSe QDs/PDPIT/ITO electrode. The results were found comparable with those obtained by using enzyme-linked immunosorbent assay method.
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Analytical Methods
·
2017
·Vol. 9
·期 31
·4581-4591
·
IF 1.9
Wei Liu,Jun Zha,Xiaoyan Meng,Jianrong Wu,Cheng Sun,Panzi Qiu,Meriem Fizir,Hua He
Mixed hemi-micelle magnetic solid phase extraction (MHMSPE) based on magnetic graphene oxide nanoparticles (MGONPs) and 1-hexadecyl-3-methylimidazolium bromide (C16mimBr) was developed for the efficient removal and trace determination of chlorophenols (CPs) in water. The adsorption mechanism of three kinds of CP was studied by applying computer simulation and zeta-potential studies. The large surface area and excellent adsorption capacity of the MGONPs after being coated with C16mimBr were exploited adequately in the MHMSPE process. Comparative studies showed that MGONPs were superior to Fe3O4 NPs as an adsorbent for the extraction of more CPs in MHMSPE. Zeta-potential data indicated that mixed hemi-micelles were formed when the amount of C16mimBr was adjusted from 1.8 to 12 mg (MGONPs = 30 mg). Different carbon chain lengths of IL-coated MGONPs were used in a further comparative study. Response surface methodology (RSM) based on Central Composite Design (CCD) was successfully applied to optimize the extraction parameters. Under optimum conditions, good linearity was obtained for the two target analytes, with correlation coefficients (R2) ranging from 0.9945 to 0.9975. The limits of detection (LODs) were in the range of 0.10–0.13 μg L−1. Finally, MGONPs-C16mimBr were successfully applied for both removal and trace determination of two CPs in environmental and tap water samples and the extraction recoveries for 1.00 μg of 2,4-DCP and 2,4,6-TCP were in the range of 78–82% and 87–90%, with high preconcentration factors (PFs) of 410 and 456, respectively.
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MOLECULES
·
2016
·Vol. 21
·期 3
·262
·
IF 2.465
Zhijian Tan,Yongjian Yi,Hongying Wang,Wanlai Zhou,Chaoyun Wang
Background: Ionic liquids (ILs) are considered as green solvents, and widely applied for the extraction of various compounds.Methods: The present research focuses on the extraction of flavonoids fromApocynumvenetumL. leaves by ultrasound-assisted extraction (UAE). Several major influencing factors were optimized. Then, an aqueous biphasic system (ABS) was applied for further isolation of flavonoids.Results: The flavonoids were mainly distributed in the top phase, while impurities were extracted to the bottom phase. The parameters influencing the extraction, namely type and concentration of salt, temperature, and pH, were studied in detail. Under optimized conditions (72.43% IL extract, 28.57% (NH4)2SO4, 25 °C temperature, pH 4.5), the preconcentration factor and extraction efficiency were found to be 3.78% and 93.35%, respectively.Conclusions: This simple and efficient methodology is expected to see great use in the extraction and isolation of pharmaceutically active components from medicinal plant resources.Keywords:ionic liquids;ultrasonic-assisted extraction;flavonoids;aqueous biphasic system;isolation
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Molecular Catalysis
·
2017
·
IF 0
Wei-Hong Zhang,Jia-Jia Shen,Jing Wu,Xue-Yuan Liang,Jie Xu,Ping Liu,Bing Xue,Yong-Xin Li
Graphene oxide (GO) was utilized as an amphiphilic support to immobilize functionalized ionic liquid containing phosphotungstatic imidazolium (Im-PW) by an anion-exchange method. The physicochemical properties of the synthesized Im-PW/GO material were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, transmission electron microscope, thermogravimetric analysis and contact angle measurements. In selective oxidation of benzyl alcohol to benzaldehyde, Im-PW/GO was determined to be an efficient triphase transfer catalyst, affording a high conversion (>90%) of benzyl alcohol and excellent selectivity (>99%) to benzaldehyde. Owing to the unique amphiphilic nature of GO support, the Im-PW/GO catalyst facilitated the contact between hydrophilic H 2 O 2 and hydrophobic benzyl alcohol, therefore demonstrated superior catalytic activity to the similar catalyst supported on conventional SBA-15. Moreover, it was readily recovered and reused up to four times without any significant loss in terms of its activity.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 28
·18556-18564
·
IF 4.123
Yalan Dai,Peiyi Wu
A new LCST-type thermoresponsive polyelectrolyte P[P4,4,4,4][SS], poly(tetrabutyl phosphonium styrene sulfonate), was introduced to PMEO2MA (poly(2-(2-methoxyethoxy)ethyl methacrylate)) via RAFT polymerization, in order to explore the transition behavior of the block copolymer PMEO2MA-b-P[P4,4,4,4][SS] with two distinct LCST-type segments. A relatively sharp LCST-type phase transition with only one transition point is observed in the turbidity curves, while the whole phase transition is completely different from the micro perspective. The phase transition temperature range is relatively broad, according to the unsynchronized changes of different protons of the two blocks in the temperature-variable 1H NMR analysis. From PCMW analysis, it is found that there exists an obvious two-step phase transition behavior, especially in the region of the C–H groups. Accordingly, we divided the whole transition process into two subregions: 20–40 °C and 40–55 °C in 2Dcos analysis. At the first stage of 20–40 °C, the CH3 groups mainly belonging to the backbones of PMEO2MA blocks have the earliest response to the heating and drive the first step of the dehydration process of PMEO2MA-b-P[P4,4,4,4][SS], resulting in the formation of an intermediate micelle state composed of the collapsed PMEO2MA core and hydrophilic P[P4,4,4,4][SS] corona. In particular, the conformational changes and the more compact structures due to the interaction between the CO groups and P[P4,4,4,4][SS] segments (ν(CO⋯D2O-PILs)) were observed using IR analysis. With the continual increase of the temperature, when the second temperature range of 40–55 °C is reached, the P[P4,4,4,4][SS] segments start to collapse and expel the water molecules, driven by the anions of the poly(ionic liquid)s, with the phosphonium cations being distributed over the relatively hydrophilic outside.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yuanchen Zhu,Gang Liu,Zhenying Cui,Hongwei Yang,Fang Liu,Baolei Jiang,Lei Chen
Blending hydrogen into existing natural gas pipelines is a cost-effective method for large-scale hydrogen transportation. However, high hydrogen ratios cause hydrogen embrittlement in pipeline steel, limiting transportation efficiency. Due to complex structures and harsh application conditions, existing coatings are difficult to apply on pipelines. To tackle such issues, we propose an ionic liquid-polymer composite coating using epoxy resin as coating substrate, based on the competitive adsorption of methane and hydrogen on pipeline steel. Ionic liquids with high methane selectivity were selected via quantum chemical calculation. The protective effect of coatings was characterized using hydrogen pre-charging constant strain tensile tests. Simulation and experimental results demonstrate that epoxy resin coatings reduce hydrogen embrittlement in X80 steel. Modified with selective CH 4 /H 2 permeability ionic liquids, the epoxy resin coating enhances methane and hydrogen competitive adsorption on the steel surface, improving hydrogen embrittlement resistance. This novel coating offers a viable solution for achieving safe and high ratio hydrogen blended transportation in natural gas pipeline.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kexin Li,Yumei Liu,Shuang Wei,Bin He,Ruiyi Yan,Ruirui Zhang,Ruixia Liu
The adoption of photothermal synergistic catalysis for cyclohexane oxidation can balance the advantages of high conversion of thermal catalysis and high selectivity of photocatalytic technology to achieve better catalytic performance. Here, we prepared functional carbon nitride (BCA-CN) by self-assembly strategy of ionic liquid [Bmim]CA (1-Butyl-3-methylimidazole citrate) with melamine and cyanuric acid utilizing abundant elements and anionic/cationic hydrogen bonding interactions. The introduction of [Bmim]CA embeds C-C (carbon and carbon band) and C-O-C (ether bond) structures into graphitic carbon nitride (g-C 3 N 4 ) framework, significantly improving light absorption capacity and migration of photo generated charge carriers. Compared to g-C 3 N 4 , both BCA-CN increases cyclohexane conversion and KA oil (the mixture of cyclohexanol and cyclohexanone) selectivity by 1.3 times under photothermal catalysis. The surface reactions are facilitated by changing adsorption sites of cyclohexane to increase adsorption energy and obtaining more hydroxyl radicals and superoxide radicals. Furthermore, the enhanced selectivity is attributed to the difficulty in generating cyclohexanone radicals. This work offers the reference scheme for the development of efficient photothermal catalysts in the selective oxidation of cyclohexane.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 14
·6180-6186
·
IF 3.269
Zeyang Xiang,Yan Zheng,Hong Zhang,Yan Yan,Xiaoyu Yang,Xia Xin,Yanzhao Yang
Microemulsions consisting of ionic liquid-type imidazolium gemini surfactants with different spacer lengths ([C14-n-C14im]Br2, n = 2, 4, 6), cyclohexane, n-hexyl alcohol and hydrochloric acid solution, were investigated for Au(III) extraction. [C14-n-C14im]Br2 in the microemulsion played a dual role as surfactant and extractant. The extraction efficiency (E%) of the [C14-n-C14im]Br2/cyclohexane/n-hexyl alcohol/HCl microemulsion system for Au was above 99% under optimal conditions. The results of our study indicated that the Au(III) extraction ability of the three different [C14-n-C14im]Br2 with different spacer lengths was better with longer a spacer. The mechanism for the Au(III) extraction by [C14-n-C14im]Br2 was confirmed to be based on an anion-exchange process by the continuous variation method and spectroscopic analysis (UV-Vis, FT-IR, 1H-NMR). The FT-IR spectra indicated that the better extraction ability of [C14-n-C14im]Br2 for Au(III) was positively correlated with the spacer length, due to a less significant steric effect of the methylene groups in surfactants with longer spacers. The electric conductivity values of the [C14-n-C14im]Br2 microemulsions indicated that surfactants with longer spacers can ionize to a higher extent to give more [C14-n-C14im]2+ cations and Br− anions, thus promoting anion-exchange and further increasing E%.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Lunbo Xu,Yu Liu,Wei Wang,Shusu Shen,Ganwei Zhang,Renbi Bai
Metal-organic frameworks (MOFs) possess various beneficial potentials, including the ability to enhance the porosity and water flux of membranes, and assist in the catalysis of the photodegradation of organic compounds such as dyes, through the interactions of the metal ions within MOFs. In this study, a MOF-808/polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) was constructed using the non-solvent induced phase separation (NIPS) method, in which, an ionic liquid, 1-butyl-3-methylimidazolium chloride was introduced as the co-solvent in the casting solution solvent, to increase the dispersibility and blending ratio of MOF-808 particles in the mixture. The optimal membrane with 1.5 wt% MOF-808 exhibited ultra-high water permeability (58.08 L·m⁻²·h⁻¹·bar⁻¹) and excellent rejection for various dyes (>90 %). The ESR spectroscopy test has proved the existence of •O 2 - and •OH in MOF-808/PVDF membrane under light irradiation, and the membrane exhibited outstanding photocatalytic self-cleaning ability, achieving a Congo Red (CR) degradation efficiency of 96.57 % under light exposure. Moreover, even after five photocatalytic self-cleaning cycles, the membrane flux almost recovered to its initial state, and the membrane maintained good CR rejection (>90 %). These observations provide ideas for developing high flux membrane technologies with photocatalytic capabilities, which will be applied for efficient treatment of practical dye wastewater.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qi Xiao,Jiawen Li,Shuai Liu,Mingli Yang,Yi Fang,Shan Huang
Given the pivotal role of hydrogen peroxide (H 2 O 2 ) in numerous biological progresses, there has been a recent surge in the development of highly effective electrochemical sensors for H 2 O 2 detection. In this article, we propose an enzyme-free amperometric system for the sensitive and selective recognition of H 2 O 2 , leveraging ultrafine PtPd alloy/ionic liquid-carbon dots (IL-CDs) nanocomposites modified flexible carbon fiber. The IL-CDs were synthesized through the direct electrodeposition of ionic liquid [BMIM][PF 6 ] using Pt sheets as electrodes. Subsequently, a sequential electrodeposition of IL-CDs, H 2 PtCl 6 , and PdCl 2 onto the activated carbon fiber (ACF) yielded the PtPd/IL-CDs/ACF microelectrode. This microelectrode serves as an enzyme-free amperometric sensor for H 2 O 2 detection, exhibiting an improved response with a significantly lower detection limit of 0.29 μM and a relatively broad linear range spanning from 2 to 6561 μM. Furthermore, this enzyme-free amperometric H 2 O 2 sensor demonstrates remarkable stability over extended periods and exceptional performance in practical applications, such as the analysis of commercially available milk, human serum, human urine, and living cancer cells analysis. This study offers a fresh perspective on amperometric sensors based on metal alloys and CDs electrode, highlighting the potential of enzyme-independent detection for hydrogen peroxide in biological systems.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 12
·1-11
·
IF 5.3
Mei Lin,Shi Yanmei,Ding Xueke,Li Jing
Surface functionalization and the combined utilization of zero‐dimensional and two‐dimensional nanomaterials is an effective method to achieve highly sensitive detection for electrochemical analysis. Using an all-in-one strategy, phthalocyanine, gold nanoparticles, and ionic liquid were successively modified on the graphene surface as a highly integrated electrode modification material. Phthalocyanine can repair the defects of reduced graphene oxide by binding to the graphene structure surface through non-covalent functionalization. The combination of ionic liquid on the surface of gold nanoparticles can enhance their physical and chemical activity while preserving their stability. The obtained phthalocyanine-coated graphene nanosheets decorated with ionic liquid-functionalized gold nanoparticles nanocomposites had enhanced electrocatalysis and conductivity ability, and were used for highly sensitive electrochemical detection of ascorbic acid in fruit juices. Excellent results were obtained for the detection of ascorbic acid in the linear range 0.05 to 50 µmol/L with a detection limit of 6.80 nmol/L ( S/N = 3) and a sensitivity of 2.68 μA μM −1 cm −2 , indicated that the proposed sensor strategy with multiple signal amplification can achieve higher detection sensitivity. Furthermore, the sensor was used to quantify ascorbic acid content in grapefruit and orange juice with good selectivity and accuracy. The highly integrated electroactive nanocomposites construction method described may also be used with other electrode modification materials and is anticipated to yield fresh perspectives on the advancement of ultrasensitive detection. Graphical
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yuchen Hu,Ziyu Gao,Huidong Wang,Li Yang,Jiaxu Zhang,Jianmin Sun
A novel protic ionic liquid di-tertiary ammonium bromide ionic liquid (DTAB-IL) was synthesized by one-step condensation at 0 ℃ with 85 % yield. DTAB-IL also exhibited effective catalytic activity for CO 2 cycloaddition without cocatalyst and solvent. The catalytic reaction conditions were optimized to 90 ℃, 4 h, 1 MPa, and the yield of propylene carbonate was obtained 96 % with high selectivity 99 %. Under the optimal conditions, DTAB-IL catalyst exhibited good recyclability and universality to various epoxides. Furthermore, temperature influence and kinetic investigation for propylene carbonate synthesis were studied. The activation energy for DTAB-IL catalyzing CO 2 cycloaddition reaction was 43.93 kJ/mol, and the reaction was found to follow first-order for propylene oxide. Efficient cycloaddition reaction of CO 2 and epoxide was attributed to the activation of epoxide and CO 2 by di-tertiary ammonium and epoxide ring-opening by bromide anion in DTAB-IL.
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危险品化学品经营许可证（带存储）