POLYMER BULLETIN
·
2016
·Vol. 74
·期 1
·75-90
·
IF 1.371
Chen Xiuqiong,Yan Huiqiong,Shi Zaifeng,Feng Yuhong,Li Jiacheng,Lin Qiang,Wang Xianghui,Sun Wei
A novel biosensor based on electro-co-deposition of myoglobin (Mb), sodium alginate (SA), Fe 3 O 4 -graphene (Fe 3 O 4 -GR) composite on the carbon ionic liquid electrode (CILE) was fabricated using Nafion as the film forming material to improve the stability of protein immobilized on the electrode surface, and the modified electrode was abbreviated as Nafion/Mb-SA-Fe 3 O 4 -GR/CILE. FT-IR and UV–vis absorption spectra suggested that Mb could retain its native structure after being immobilized in the SA-Fe 3 O 4 -GR composite film. The electrochemical behavior of the modified electrode was studied by cyclic voltammetry, and a pair of symmetric redox peaks appeared in the cyclic voltammograms, indicating that direct electron transfer of Mb was realized on the modified electrode, which was ascribed to the good electrocatalytic capability of Fe 3 O 4 -GR composite, the good biocompatibility of SA and the synergistic effects of SA and Fe 3 O 4 -GR composite. The electrochemical parameters of the electron transfer number ( n ), the charge transfer coefficient ( α ) and the electron transfer rate constant ( k
s ) were calculated as 0.982, 0.357 and 0.234 s −1 , respectively. The modified electrode exhibited good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) with wide linear range from 1.4 to 119.4 mmol/L, low detection limit as 0.174 mmol/L (3 σ ), good stability and reproducibility.
研究领域:
生物传感器
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电化学
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蛋白质电化学
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纳米材料
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生物相容性材料
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分子诊断
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转化医学
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Shuo Xie,Wenbin Zhang,Yike Han,Xinyan Dong,Wanning Li,Penghui Li,Liyun Kong
The accurate determination of pharmaceuticals and personal care products (PPCPs) in wastewater is crucial for comprehensive environmental risk assessment and human exposure evaluation. Given the complex matrices of aqueous environmental samples, efficient sample preparation remains a critical challenge in analytical procedures. This study presents an ionic liquid-based aqueous two-phase system (IL-ATPS) extraction methodology used as a pretreatment step prior to high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) for the simultaneous determination of 38 PPCPs. A mechanistic investigation revealed that target analytes with more hydrogen-bonding sites and higher hydrogen-bond donor (HBD) capacity exhibited enhanced solubility in ILs. In addition, IL anions with stronger hydrogen-bond acceptor (HBA) capacity further improved the solubility of the 38 PPCPs. These findings indicate that hydrogen bonding between analytes and ILs likely played a critical role in the dissolution mechanism. The established IL-salt ATPS extraction method utilized a 15 mL aqueous sample, 0.2 g tetraethylammonium acetate ([N 2222 ][OAc]), and 12 g K 2 HPO 4 , with a 1-minute vortex mixing. Compared with traditional solid phase extraction (SPE), this approach significantly reduced the sample volume from 1 L to 15 mL, avoided the use of volatile organic solvents, simplified the overall processing, and enabled rapid (<15 minutes) pretreatment. The method demonstrated excellent sensitivity with limits of detection (LODs) ranging from 0.00013 to 0.11 ng/mL. Method validation via standard addition experiments demonstrated satisfactory accuracy, yielding recoveries between 74.3 and 129.8 %. Precision was assessed using both intra-day and inter-day measurements. The intra-day relative standard deviations (RSDs) ranged from 0.7 % to 19.9 %, while the inter-day RSDs ranged from 1.4 % to 18.4 %, demonstrating that the method provides consistent and reproducible results under controlled laboratory conditions. These findings underscore the present IL-based ATPS extraction method, followed by HPLC-MS/MS analysis, as an eco-friendly, robust, and scalable approach for PPCPs monitoring in aqueous environmental samples, offering potential applications in environmental monitoring and risk assessment.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Wenyuan Zhang,Ziqiu Ren,Yan Guo,Xiong He,Xin Li
Poor long-term stability of perovskite solar cells (PSCs) in ambient air has hindered the PSC commercialization. In this work, we introduce an ionic liquid (IL) of 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM]PF 6 ) as an inter-layer between the ZnO and perovskite layers. The devices are fabricated in air without any atmosphere controlling. Solar cell with a power conversion efficiency of 13.50% is obtained, and a small J-V hysteresis is accomplished. More importantly, after 90 days (>2000 h) storage in air, our device without encapsulation retains 88.17% of its initial efficiency. Our work provides a simple valid strategy to develop air-processed, stable and efficient PSCs for future applications.
研究领域:
材料科学
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光伏技术
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可再生能源
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纳米技术
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Tingting Chen,Yunfei Zhang,Yingjie Xu
A novel basic anion-functionalized ionic liquid with a 1-methylhydantoin anion ([1-MHy]−) and [P4442]+ cation was synthesized for efficient CO2 capture and catalytic conversion of CO2 to quinazoline-2,4(1H,3H)-dione, and CO2 absorption and conversion mechanisms were investigated by NMR, FT-IR, and DFT calculations. CO2 absorption results show that the capture capacity of [P4442][1-MHy] at 303.15 K and 0.1 MPa is up to 1.58 molCO2/molIL, which is attributed to the multiple-site cooperative interactions between CO2 with N– and C═O of [1-MHy]− originated from the electron conjugation effect, resulting in a decrease in the CO2 absorption enthalpy (−51.4 kJ/mol) and an increase in the activation of CO2. Moreover, the high yield of quinazoline-2,4(1H,3H)-dione obtained by using [P4442][1-MHy] to catalyze 2-aminobenzonitrile with atmospheric-pressure CO2 was 97% and is solvent- and metal-free. The reaction mechanism indicates that [1-MHy]− with the multiple-site cooperative interactions can not only activate CO2 but also can activate 2-aminobenzonitrile by forming two types of hydrogen bonds with −NH2 (N–H···N– and N–H···O═C), thus ensuring the excellent catalytic performance of [P4442][1-MHy]. Furthermore, due to the similar basicity of [1-MHy]− to the quinazolide anion ([Quinazolide]−), it can effectively prevent the deprotonation of the acidic quinazoline-2,4-dione into [Quinazolide]−, thereby improving its yield. In addition, [P4442][1-MHy] has good recycling performance during CO2 capture and conversion. The physicochemical properties of [P4442][1-MHy] are also reported. The obtained results may provide a new strategy for converting CO2 into value-added chemicals under green conditions.
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JOURNAL OF SEPARATION SCIENCE
·
2023
·Vol. 46
·期 16
·2300250
·
IF 3.1
YueYue Zhang,Youfang Huang,Xiaojia Huang
Efficient enrichment is a challenging and indispensable step in the quantification of polar synthetic auxins in complex samples. In the current study, a new magnetic adsorbent based on polymeric ionic liquid/aminated carbon nanotube composite was fabricated with a one-pot precipitation copolymerization strategy and employed as the extraction phase of magnetic solid phase extraction of synthetic auxins. Various characterization techniques were utilized to inspect the morphology, structure, magnetic property, and functional groups of the prepared adsorbent. Under the optimal conditions, the obtained adsorbent displayed satisfactory capture performance towards studied auxins through multiple interactions. Adsorption studies evidenced that the adsorption procedure of the developed method towards analytes was fit for the Freundlich adsorption model and pseudo-second-order kinetics. Combining with high-performance liquid chromatography, sensitive and reliable method for the identification and quantification of trace synthetic auxins in environmental water and fruit juice samples was developed. The obtained limits of detection for water and fruit juice samples located in the ranges of 0.0059–0.013 and 0.018–0.031 μg/L, respectively. Recoveries in actual samples with different fortified contents varied from 82.2% to 117%, with satisfactory reproducibility. The results will evidence that the introduced extraction technique is a useful alternative for the entrapment of trace synthetic auxins from complex samples.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 25
·10141-10150
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IF 3.069
Bin Zhao,Baogang Wang,Hongsheng Lu,Shanshan Dai,Zhiyu Huang
Ionic liquid modified CDs and novel thin nanosheets constructed graphitic carbon nitride (g-C3N4) microspheres were synthesized by the template method and by calcination of a supramolecular precursor, respectively. The CDs were decorated onto the surface of g-C3N4 by solvothermal treatment to tune the visible-light photocatalytic degradation performance of g-C3N4. The CDs could not only form heterojunctions with g-C3N4 by chemical bonding, π–π stacking and electronic attraction interactions, but also change the surface charges of g-C3N4 from negative to positive. The roles played by heterojunctions and surface charges in the photocatalytic performance of CDs (1.6 wt%)/g-C3N4 composites were explored by photocatalytic degradation of anionic (methyl orange, MO), nonionic (p-nitrophenol, p-NP) and cationic (methylene blue/rhodamine B, MB/RhB) pollutants. Compared with g-C3N4, the composite showed obviously higher and lower photocatalytic activity for MO/p-NP and MB/RhB degradation, respectively. These results demonstrated that the surface charges might play a positive or negative but dominant role by enhancing or inhibiting the absorption of pollutant molecules despite the fact that heterojunctions always played a positive role by promoting the light-harvesting ability and separation efficiency of photo-generated electron–hole pairs of g-C3N4.
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Polymers
·
2018
·Vol. 10
·期 12
·1329
·
IF 2.935
Lingyu Liu,Xudong Zhu,Yanbo Zeng,Hailong Wang,Yixia Lu,Jian Zhang,Zhengzhi Yin,Zhidong Chen,Yiwen Yang,Lei Li
In this paper, we report a new composite of reduced graphene oxide/Fe3O4-ionic liquid based molecularly imprinted polymer (RGO/Fe3O4-IL-MIP) fabricated for diphenylamine (DPA) detection. RGO/Fe3O4-IL-MIP was prepared with RGO/Fe3O4as supporter, ionic liquid 1-vinyl-3-butylimidazolium hexafluorophosphate ([VC4mim][PF6]) as functional monomer, ionic liquid 1,4-butanediyl-3,3’-bis-l-vinylimidazolium dihexafluorophosphate ([V2C4(mim)2][(PF6)2]) as cross-linker, and diphenylamine (DPA) as template molecule. Fourier transform infrared spectroscopy, thermal gravimetric analysis, scanning electron microscopy, and vibrating sample magnetometer were employed to characterize the RGO/Fe3O4-IL-MIP composite. RGO/Fe3O4-IL-MIP was then drop-cast onto a glassy carbon electrode to construct an electrochemical sensor for DPA. The differential pulse voltammetry (DPV) peak current response for 20 μM DPA of RGO/Fe3O4-IL-MIP modified glassy carbon electrode (GCE) was 3.24 and 1.68 times that of RGO/Fe3O4-IL-NIP and RGO/Fe3O4-EGDMA-MIP modified GCEs, respectively, indicating the advantage of RGO/Fe3O4-IL-MIP based on ionic liquid (IL) as a cross-linker. The RGO/Fe3O4-IL-MIP sensor demonstrated good recognition for DPA. Under the optimized conditions, the RGO/Fe3O4-IL-MIP sensor exhibited a DPA detection limit of 0.05 μM (S/N = 3) with a linear range of 0.1–30 μM. Moreover, the new RGO/Fe3O4-IL-MIP based sensor detected DPA in real samples with satisfactory results.Keywords:reduced graphene oxide;Fe3O4;molecularly imprinted polymer;ionic liquid cross-linker;electrochemical sensor;diphenylamine
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Xuzhao Yang,Jun Wang,Yun Fang
A novel asymmetrical gemini ionic liquid, 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis(dicyanamide) ([N 111 C 3 MIM][N(CN) 2 ] 2 ), was synthesized and characterized by 1 H NMR, 13 C NMR. Thermal stability of [N 111 C 3 MIM][N(CN) 2 ] 2 was investigated through thermogravimetric analysis under pure nitrogen atmosphere. Heat capacity of pure [N 111 C 3 MIM][N(CN) 2 ] 2 was measured using differential scanning calorimetry in the temperature range 298.15–423.15 K and enthalpy H T -H 298.15K , and entropy S T -S 298.15K were obtained. Densities and viscosities were measured for the binary system of [N 111 C 3 MIM][N(CN) 2 ] 2 and isopropanol (IPA) over the entire range of mole fractions at various temperatures from 283.15 to 333.15 K under the pressure of 0.101 MPa. Moreover, the excess molar volumes ( V m E ) and the viscosity deviations (Δ η ) for the binary mixtures were determined and well fitted to the Redlich−Kister polynomials. The negative values of V m E and Δ η result from strong self-association and weak hydrogen bonding interaction between the molecules of [N 111 C 3 MIM][N(CN) 2 ] 2 and IPA. Excess Gibbs energy of activation (Δ G *E ) of viscous flow for the present binary mixtures were also calculated. Results have been discussed in terms of molecular interactions and structures.
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FOOD CHEMISTRY
·
2018
·
IF 4.946
Li Yao,Haitao Liu,Xie Wang,Wenzhi Xu,Yongqun Zhu,Hong Wang,Liangyu Pang,Chaowen Lin
A novel ultrasound-assisted surfactant-enhanced emulsification microextraction (UASEME) using a magnetic ionic liquid (MIL) coupled with micro-solid phase extraction was developed for the preconcentration of cadmium and lead in edible vegetable oils prior to analysis by graphite furnace atomic absorption spectrometry. MIL [C 4 mim] [FeCl 4 ] was used as the extractant, non-ionic surfactant Triton X-100 as the emulsifier and Fe 3 O 4 nanoparticles as the sorbent, while ultrasound was applied to assist the dispersion of the extractant and accelerate the mass transfer process. By mixing Fe 3 O 4 nanoparticles with the MIL after UASEME, the phase separation time was shortened and the separation can be simplified by applying an external magnetic field. Under the optimized conditions, the proposed method was validated and the results demonstrated that the method can produce satisfactory linearity, sensitivity, reproducibility and recovery for the analytes. Finally, the method was successfully applied for the determination of Cd and Pb in edible vegetable oil samples.
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ULTRASONICS SONOCHEMISTRY
·
2018
·
IF 6.012
Xuedong Wang,Mei Wang,Xuran Wang,Liyang Du,Fangyu Chu,Weinan Ding,Haidong Gu,Huili Wang
A microextraction method was developed based on utilization of a novel ionic liquid (IL) [C 4 MIM][NCA] as disperser and conventional ILs as extractor (IL-IL-DLLME). This method was integrated with an in-situ metathesis reaction to achieve high extraction efficiency by eliminating the loss of analytes in the discarded disperser after microextraction. Ultrasonic energy was compared to traditional mechanical shaking to accelerate the in-situ metathesis reaction. A 3-min ultrasonic treatment provided similar extraction efficiency as a 120-min mechanical shaking. Due to their strong acidity and lower solubility than traditional hydrophilic ILs, utilization of [C 4 MIM][NCA] in the IL-IL-DLLME procedure increased extraction recoveries (ERs) for triclosan (TCS) and methyltriclosan (MTCS) by 10–12% and also avoided an extra pH adjustment step. A series of operational parameters were optimized using single-factor screening and central composite design as follows: 65 µL extraction solvent, 150 µL [C 4 MIM][BF 4 ] and [C 4 MIM][NCA] (132/18, v/v, μL) as dispersive solvent, 0.16 g NH 4 PF 6 and 3.3 min ultrasonic time. Under optimized conditions with a fortification of 100 µg kg −1 , ERs were 92.6–93.4% for TCS and 92.7–94.2% for MTCS in bovine milk and chicken egg samples. LODs for TCS and MTCS were 0.16–0.24 µg kg −1 and the enrichment factors were 21.8–23.1. Inter- and intra-day precisions had relative standard deviations of 3.3–5.4% for the optimized method. Overall, this newly developed IL-IL-DLLME method was effective for detecting trace levels of TCS and MTCS in real-world, animal-based foods. Prominent advantages of the new method include high precision and accuracy, high extraction efficiency, simple analytical operations, and no use of organic solvents making the procedure environmentally benign.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xikun Zhang,He Zhang,Xue Lv,Ting Xie,Junzheng Chen,Di Fang,Shurui Yi
Dye wastewater poses a serious threat to the environment and human health, necessitating sustainable degradation methods. In this study, Na-based Montmorillonite (MMT) was exfoliated using different ionic liquids ([C16MIM][Cl], [C16MIM][BF 4 ], [C16MIM][PF 6 ]), and silver nanoparticles (Ag NPs) were green-synthesized using hydroxypropyl cellulose (HPC). The HPC significantly enhanced the dispersion of MMT in the hydrogel. By introducing lauryl methacrylate (LMA), a hydrophobic associative network was constructed in PAM/LMA/HPC/MMT@ILs&Ag NPs hydrogel. This hydrogel demonstrated outstanding mechanical properties, with a stress of 833.21 kPa, strain of 3300 %, and toughness of 14.36 MJ/m 3 . It also exhibited excellent catalytic activity, with a rate constant of 0.83 min −1 for 4-nitrophenol degradation at 28 °C. The effects of temperature and catalyst concentration on the catalytic reaction were systematically investigated. This study presents a simple green synthesis approach for Ag NPs using HPC, achieving superior mechanical performance and stable MMT dispersion in aqueous solutions.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Shanshan Wang,Chao Han,Sisi Wang,Lijuan Bai,Shanshan Li,Jianguang Luo,Lingyi Kong
Cu(II) complexed amino acid ionic liquid , Cu(II)-[1-butyl-3-methylimidazolium][L-Pro] (Cu(II)-[BMIm][L-Pro]), was successfully adopted as chiral ligand to improve the enantioseparation efficiency in high speed counter-current chromatography (HSCCC). For the enantioseparation of intractable naringenin (NRG) racemic mixtures, Cu(II)-[BMIm][L-Pro] coupled with hydroxypropyl-β-cyclodextrin (HP-β-CD) was successfully applied as dual chiral selectors in HSCCC. The influence of important parameters, including the concentration of the chiral selectors, the pH value, and the temperature were investigated. Under optimal conditions, 4.5 mg of (+)-NRG and 4.1 mg of (−)-NRG were successfully separated from 10 mg NRG racemic mixtures with the purity of 98%. The chiral recognition mechanism of dual chiral selectors was illuminated by the UV–vis and NMR spectra, suggesting that the enantioseparation was upon the difference of the thermodynamic stability of the quaternary complexes of Cu(II), [BMIm][L-Pro], HP-β-CD, and NRG. The results illustrated that the developed HSCCC system, based on the synergistic mechanism of Cu(II)-[BMIm][L-Pro] and HP-β-CD, exhibited better performance on enantioseparation and had great application potential in preparative chiral separation of natural products.
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危险品化学品经营许可证（带存储）