查找使用阿拉丁产品的科研文献

Use of magnetic effervescent tablet-assisted ionic liquid dispersive liquid–liquid microextraction to extract fungicides from environmental waters with the aid of experimental design methodology

Miyi Yang,Xiaoling Wu,Yuhan Jia,Xuefei Xi,Xiaoling Yang,Runhua Lu,Sanbing Zhang,Haixiang Gao,Wenfeng Zhou

In this work, a novel effervescence-assisted microextraction technique was proposed for the detection of four fungicides . This method combines ionic liquid-based dispersive liquid–liquid microextraction with the magnetic retrieval of the extractant. A magnetic effervescent tablet composed of Fe 3 O 4 magnetic nanoparticles , sodium carbonate, sodium dihydrogen phosphate and 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonimide) was used for extractant dispersion and retrieval. The main factors affecting the extraction efficiency were screened by a Plackett–Burman design and optimized by a central composite design. Under the optimum conditions, good linearity was obtained for all analytes in pure water model and real water samples. Just for the pure water, the recoveries were between 84.6% and 112.8%, the limits of detection were between 0.02 and 0.10 μg L −1 and the intra-day precision and inter-day precision both are lower than 4.9%. This optimized method was successfully applied in the analysis of four fungicides (azoxystrobin, triazolone, cyprodinil , trifloxystrobin) in environmental water samples and the recoveries ranged between 70.7% and 105%. The procedure promising to be a time-saving, environmentally friendly, and efficient field sampling technique.

A fast-response and water-resistant flexible humidity sensor based on a composite of ionic liquid and hydrogen-bonded organic frameworks encapsulated with a hydrophobic coating

Xiaodong Huang,Yang Li,Yongfan Zhang,Guangyu Liu,Xing Zhao

Facile preparation of hydrogen-bonded organic framework (HOF-1) @ ionic liquid (IL-1). • Flexible humidity sensor (FHS) of HOF-1@IL-1 encapsulated with hydrophobic coating (POTs). • HOF-1@IL-1@POTs FHS exhibits short response/recovery time (2 s/3 s), minimal hysteresis (∼1% RH). • HOF-1@IL-1@POTs FHS shows good water-resistance. Flexible humidity sensors (FHS) with fast-response and good water-resistance are highly favored for applications in sophisticated scenarios. Herein, a composite of 2D hydrogen-bonded organic framework (HOF) with ionic liquid (IL) was encapsulated with a hydrophobic coating (POTs) to construct FHS. Specifically, a 2D HOF was obtained by self-assembly of 4,4',4''-(1,3,5-triazine-2,4,6-triyl)triphenylamine, and then the IL of 1-ethyl-3-methylimidazolium tetrafluoroborate was anchored onto the HOF as driven by intermolecular hydrogen-bonding interactions. Moreover, POTs was obtained from hydrolysis and condensation of triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane. The IL@HOF@POTs FHS showed fast response (response time: 2 s, recovery time: 3 s), minimal hysteresis (relative humidity of ∼1%) and excellent long-term stability. Furthermore, it demonstrated exceptional water-resistance as revealed by negligible change in humidity response after immersion in water for 30 min. Density functional theory calculations and electrochemical impedance spectroscopy analysis were carried out to explore the sensing mechanism, and it was proposed that the modulation of the interaction energy of the composite with adsorbed water molecules accelerated the response. Meanwhile, the FHS was successfully employed for real-time respiratory monitoring, speech recognition, contactless human-machine interfaces and generation of Morse code. The study reveals that the composite of HOF and IL are promising in the construction of advanced sensors. Download: Download high-res image (145KB) Download: Download full-size image

Dual electromagnetic enhancement engineering of hybrid Au film–poly(ionic liquid) nanohole–SiO2 nanosphere–Au nanosphere substrates integrated with machine learning algorithm for ultrasensitive SERS detection

Shiqiang Wang,Changkun Qiu,Huiyun Jiang,Yan Jin,Haozhi Wang,Liang Zhu

An Au film–PIL nanohole–SiO 2 nanosphere–Au nanosphere SERS substrate integrated with machine learning was fabricated. • Dual electromagnetic enhancement was realized by waveguide modes of hybrid structure and LSPR of Au nanospheres. • PIL nanoholes around Au nanospheres promoted PAHs adsorption through hydrophobic effect and π-π stacking interaction. • The PCA-SVM model achieved over 95% prediction accuracy for PAHs of various concentrations and species in river water. Surface-enhanced Raman spectroscopy (SERS) is a promising trace detection technique, yet its practical application in environmental pollutant analysis remains severely restricted by insufficient electromagnetic enhancement and weak adsorption capacity toward target analytes. Herein, a novel hybrid SERS substrate with dual electromagnetic enhancement and highly efficient molecular enrichment was facilely fabricated, featuring a hierarchical structure of Au film–poly(ionic liquid) (PIL) nanohole–SiO 2 nanosphere–Au nanosphere. In this system, the waveguide optical modes of the Au film–PIL nanohole–SiO 2 nanosphere structure induce the primary electromagnetic enhancement, while Au nanospheres are precisely positioned in the primary enhancement regions to deliver a secondary electromagnetic enhancement through localized surface plasmon resonance (LSPR), thereby realizing a high enhancement factor of 2.35 × 10 7 for pyrene. Meanwhile, PIL nanoholes facilitate specific adsorption and enrichment of polycyclic aromatic hydrocarbons (PAHs) within hotspots via the hydrophobic effect and π-π stacking interactions, significantly amplifying the SERS response of analytes. The hybrid substrate exhibits excellent analytical performance, with limits of detection (LODs) as low as 5.33 × 10 −10  mol/L for pyrene and 3.97 × 10 −10  mol/L for anthracene, respectively. Furthermore, a combined principal component analysis (PCA) and support vector machine (SVM) algorithm was employed to efficiently extract spectral features and reduce data dimensionality, achieving a prediction accuracy exceeding 94% for varying concentrations and species of PAHs in actual river water samples. Taken together, the combination of this hybrid SERS substrate and the PCA-SVM algorithm provides a novel sensing platform, enabling ultrasensitive, accurate, and intelligent trace-level detection of environmental pollutants in complex matrices. Download: Download high-res image (185KB) Download: Download full-size image

In-situ ionic liquid dispersive liquid-liquid microextraction using a new anion-exchange reagent combined Fe3O4 magnetic nanoparticles for determination of pyrethroid pesticides in water samples

Chen Fan,You Liang,Hongqiang Dong,Guanglong Ding,Wenbing Zhang,Gang Tang,Jiale Yang,Dandan Kong,Deng Wang,Yongsong Cao

In this work, in-situ ionic liquid dispersive liquid-liquid microextraction combined ultrasmall Fe 3 O 4 magnetic nanoparticles was developed as a kind of pretreatment method to detect pyrethroid pesticides in water samples. New anion-exchange reagents including Na[DDTC] and Na[N(CN) 2 ] were optimized for in-situ extraction pyrethroids, which showed enhanced microextraction performance. Pyrethroids were enriched by hydrophilic ionic liquid [P 4448 ][Br] (aqueous solution, 200 μL, 0.2 mmol mL −1 ) reaction in-situ with anion-exchange reagent Na[N(CN) 2 ] (aqueous solution, 300 μL, 0.2 mmol mL −1 ) forming hydrophobic ionic liquid as extraction agent in water sample (10 mL). Ultrasmall superparamagnetic iron oxide nanoparticles (30 mg) were used to collect the mixture of ionic liquid and pyrethroids followed by elution with acetonitrile. The extraction of ionic liquid strategies was unique and efficiently fulfilled with high enrichment factors (176–213) and good recoveries (80.20–117.31%). The method was successively applied to the determination of pyrethroid pesticides in different kinds of water samples with the limits of detection ranged from 0.16 to 0.21 μg L −1 . The proposed method is actually nanometer-level microextraction (average size 80 nm) with the advantages of simplicity, rapidity, and sensitivity.

Cu(II) coordinated N-bearing heteropolyacid-based poly(ionic liquid)s for allylic oxidation of cyclohexene to 2-cyclohexene-1-one with O2 under mild conditions

Binxiong Guang,Yiwei Zhang,Yahui Xiao,Miaojun Su,Yong Liu

To bridge transition metal complexes and heterogeneous catalysts for allylic oxidation of cyclohexene to 2-cyclohexene-1-one with O2 under mild conditions, Cu(II) coordinated N-bearing heteropolyacid-based poly(ionic liquid)s (Cu-PDVD-PW) were herein synthesized as novel heterogeneous catalysts. The physicochemical properties of the catalysts were investigated by BET, TG, XPS, FT-IR and SEM/EDS analysis. The results indicated that the as-prepared Cu-PDVD-PW catalyst inherited appreciable mesopores and excellent thermal stability from the N-bearing poly(ionic liquid)s, which could increase the mass transfer rate and provide more accessible active sites. Significantly, the Cu2+ cations were homogeneously and stably coordinated on the N-bearing poly(ionic liquid)s, which greatly improved the catalytic performance for cyclohexene oxidation toward 2-cyclohexene-1-one with O2 under mild conditions. Specifically, the 3% Cu-PDVD-PW catalyst exhibited 75.9% conversion of cyclohexene with a selectivity towards 2-cyclohexene-1-one of 45.5% and no activity loss within five cycles under the optimum reaction conditions.

Gold Nanoparticle (Au NP)-Decorated Ionic Liquid (IL) Based Liposome: A Stable, Biocompatible, and Conductive Biomimetic Platform for the Fabrication of an Enzymatic Electrochemical Glucose Biosensor

Hongzhuang Chen,Jialin Fan,Xue Chen,Zhenkuan Ma,Ling Zhang,Xuwei Chen

A novel liposomal nanocomposite with biocompatibility and conductivity, Au@ILs-polysome, was fabricated and first utilized as the electrode material to immobilize the redox enzyme glucose oxidase (GOD) for the sensitive determination of glucose. Ionic liquids (ILs)-based polysome (ILs-polysome) was prepared via the radical polymerization of ILs based liposome (ILs-liposome) and improved by ion exchange with chloroauric acid to prepare Au nanoparticles (Au NPs) modified ILs based polysome (Au@ILs-polysome). The morphology, surface properties, and structure of Au@ILs-polysome were characterized; the results suggest that the nanocomposite exhibited excellent stability on the surface of solid electrodes without fusion. Electrochemical impedance spectroscopy (EIS) demonstrated that the nanocomposite had enhanced conductivity. Cyclic voltammetry (CV) shows that the direct electron transfer of GOD was achieved on the GOD/Au@ILs-polysome/GCE electrode since the Au@ILs-polysome provided a biocompatible microenvironment that made the immobilized enzyme stay natural and active. Differential pulse voltammetry (DPV) demonstrates that the GOD/Au@ILs-polysome/GCE electrode exhibited improved electrocatalytic activity compared with the GOD/ILs-polysome/GCE electrode. The electrochemical sensor exhibited a low detection limit of 0.02 mM, high sensitivity of 32.52 µA mM−1 cm−2, high selectivity toward glucose, and good stability. The practical application of the sensor was verified by the determination of glucose in human serum. The multi-component liposomal nanocomposites possess universal significance in protein-based direct electrochemical devices while offering a facile route to fabricating a highly sensitive glucose sensor for practical clinical diagnosis.

Preparation and Characterization of Protein Molecularly Imprinted Poly (Ionic Liquid)/Calcium Alginate Composite Cryogel Membrane with High Mechanical Strength for the Separation of Bovine Serum Albumin

Jie-Ping Fan,Wen-Ya Dong,Xue-Hong Zhang,Jia-Xin Yu,Cong-Bo Huang,Li-Juan Deng,Hui-Ping Chen,Hai-Long Peng

In order to improve the mechanical strength and imprinting efficiency, a novel bovine serum albumin (BSA) molecularly imprinted poly(ionic liquid)/calcium alginate composite cryogel membrane (MICM) was prepared. The results of the tensile test indicated that the MICM had excellent mechanical strength which could reach up to 90.00 KPa, 30.30 times higher than the poly (ionic liquid) membrane without calcium alginate; the elongation of it could reach up to 93.70%, 8.28 times higher than the poly (ionic liquid) membrane without calcium alginate. The MICM had a very high welling ratio of 1026.56% and macropore porosity of 62.29%, which can provide effective mass transport of proteins. More remarkably, it had a very high adsorption capacity of 485.87 mg g−1at 20 °C and 0.66 mg mL−1of the initial concentration of BSA. Moreover, MICM also had good selective and competitive recognition toward BSA, exhibiting potential utility in protein separation. This work can provide a potential method to prepare the protein-imprinted cryogel membrane with both high mechanical strength and imprinting efficiency.Keywords:molecularly imprinted cryogel membrane;poly (ionic liquid);alginate;separation;bovine serum albumin

Preparation of biacidic tin-based ionic liquid catalysts and their application in catalyzing coupling reaction between ethylene carbonate and dimethyl succinate to synthesize poly(ethylene succinate)

Xiudan Zhao,Liying Guo,Tiejun Xu,Haiyue Wang,Rongrong Zheng,Zezhong Jiang

Three biacidic tin-based functional ionic liquid catalysts were prepared, including [HO3S-(CH2)3-mim]Cl-SnCl4, [HOOC-(CH2)2-mim]Cl-SnCl4, and [HO-(CH2)2-mim]Cl-SnCl4. A Fourier transform infrared (FT-IR) spectrometer, a nuclear magnetic resonance instrument (1H NMR), an X-ray diffractometer (XRD), and a thermal gravimetric analyzer (TGA) were used to test and analyze the structures, molecular structure, crystal structures, and thermal performance of the three catalysts. And investigate their performance in catalyzing the coupling reaction between ethylene carbonate (EC) and dimethyl succinate (DMSu) to synthesize poly(ethylene succinate) (PES). Orthogonal tests were performed to optimize process parameters, explore the effect of polycondensation temperature on the intrinsic viscosity number ([η]) of PES, and discuss the effect of acidic groups on catalytic performance and the mechanism of the catalytic action. An FT-IR spectrometer and a TGA were used for structural characterization and thermal performance tests on polymer PES, and biodegradability tests (enzymolysis tests) on PES. The results showed that the three biacidic tin-based functional ionic liquid catalysts prepared in this study had a satisfactory catalytic effect. Among them, the sulfonic acid imidazole tin-based ionic liquid catalyst ([HO3S-(CH2)3-mim]Cl-SnCl4) manifested the best catalytic performance. The catalytic mechanism of the biacidic tin-based ionic liquid catalysts was further explained and discussed. Under the optimal process conditions for the transesterification reaction (temperature: 227 °C; material ratio: EC : DMSu = 1; catalyst consumption: 1.0 wt%; time: 5.5 h), PES had a yield of 67.12%, a selectivity of 82.47%, and an intrinsic viscosity number of [η] = 1.052 dL g−1, and had good thermal stability and biodegradability.

Ionic liquid-based dispersive liquid–liquid microextraction followed by dispersive solid phase extraction coupled with HPLC-DAD for the determination of sulfonylurea herbicides in soymilk samples

Jilong Li,Weili Xu,Xiujuan Wang,Fengze Wu,Lin Wang,Ji Feng,Zhibing Wang,Hanqi Zhang

Flexible, thermostable and flame-resistant epoxy-based thermally conductive layered films with aligned ionic liquid-wrapped boron nitride nanosheets via cyclic layer-by-layer blade-casting

Gaojie Han,Di Zhang,Chuiming Kong,Bing Zhou,Yongqian Shi,Yuezhan Feng,Chuntai Liu,De-Yi Wang

Increasing power density and excess heat production in integrated electronic devices create the strong demand for polymeric thermal management materials with excellent thermal stability, flame retardancy and thermal conductivity. To this end, high-performance ionic liquid-wrapped boron nitride nanosheets (BNNS@IL) were firstly simultaneously exfoliated and flame-retardant functionalized via one-step ball milling process based on the strong mechanochemical action. Epoxy (EP)-based layered films with highly in-plane oriented BNNS@IL were then fabricated by a novel, effective and solvent-free cyclic layer-by-layer (CLbL) blade-casting method. Arising from the highly flat oriented structure and rich flame-retardant functional groups of BNNS@IL, as well as the high compatibility between filler and matrix, the as-fabricated EP/BNNS@IL films exhibited high anisotropic thermal conductivity (K ∥ of 8.3 and K ⊥ of 0.8 W m −1  K −1 ), outstanding thermal stability and flame retardancy with a dramatic decrease in PHRR (104.2 W/g) and THR (8.1 kJ/g) corresponding to reductions of 72.9% and 75.7% compared with neat EP, respectively. Additionally, the flat oriented structure and strong interfacial interaction also endow EP/BNNS@IL films with high flexibility and excellent mechanical properties. Therefore, the high-effective CLbL casting method and the obtained high-performance EP-based film exhibit a significant potential application in high power flexible electrical devices and thermal management products.

Encapsulation of ionic liquid, phosphotungstic acid inside the nanocages of MIL-101(Cr): Effective and reusable catalyst for efficient solvent-free oxidative desulfurization from fuel oil

Bo-Long Jiang,Dong-Xu Zhang,Dan-Dan Yuan,Yan-Guang Chen,Tian-Zhen Hao,Hua Song

Oxidative desulfurization from fuel oil is one of the important methods for deep desulfurization. The development of efficient oxidative desulfurization catalysts is crucial for improving the desulfurization performance. Successful encapsulation of phosphotungstic acid (HPW) and ionic liquid (BMImBr) inside the mesoporous cages of MIL-101(Cr) was accomplished through a combination of “bottle around ship” and “ship in bottle” methods. The obtained BMImPW@MIL-101(Cr) composite was characterized by XRD, FTIR, BET, SEM, XPS and ICP methods. Results indicated that the BMImPW@MIL-101(Cr) composites with PW 3− loading of 23.1–50.7 wt% were obtained, demonstrating that the “bottle around ship” method is beneficial to make full use of nanocages of MIL-101(Cr) to obtain expected high loading of active PW 3 − . The BMImPW@MIL-101(Cr) exhibits excellent reusability with no evidence of leaching of active PW 3 − and BMIm + , and well-preserved structure after successive cycles of regeneration and reuse. The significantly improved stability of BMImPW@MIL-101(Cr) as compared to HPW@MIL-101(Cr) is possibly because the leaching of the active PW 3 − − sites can be greatly suppressed by forming large size of BMImPW owing to introduction of BMIm + cation. The BMImPW@MIL-101(Cr) exhibited excellent catalytic activity for solvent free oxidative desulfurization of refractory sulfides. The enhanced oxidative desulfurization activity as compared to HPW@MIL-101(Cr) can be explained by the intimate contact of sulfides with active PW 3 − sites owing the strong attraction of BMIm + cation with the sulfides.

Installation of synergetic binding sites in β-Cyclodextrin-Bipyridine ionic liquid based magnetic sorbent for simultaneous removal of anionic PFAS and Cr (Ⅵ) in water matrix

Muhammad Usman,Adeel Ahmed,Bing Yu,Muhammad Rafiq,Zhijian Ji,Youqing Shen,Hailin Cong

Herein, we develop a versatile strategy for developing a Fe 3 O 4 -NH-β-CD-BP ILs based sorbent by installing synergistic bonding sites for simultaneous removal of per- and polyfluoroalkyl substances (PFASs) and heavy metals from contaminated water. This sorbent with its quaternary ammonium cation achieved remarkable removal efficiency (∼99 %)for both short and long chain anionic PFASs in pure water as compared to previous β-CD based materials. Moreover, when subjected to a challenging metal salt matrix, the adsorbents revealed that long-chain PFASs primarily relied on electrostatic and hydrophobic interactions, while short-chain PFASs depended solely on electrostatic attractions. The results indicate that the sorbent exhibits outstanding adsorption capacities for PFCAs, PFSAs and Cr (VI) coupled with fast adsorption kinetics featuring equilibrium times 5, 4 and 2 h, respectively. The simultaneous removal of PFOA, PFOS and Cr (VI) in multi-component systems (electroplating plant wastewater) was also determined due to their dual sites rendered by cationic and β-CD groups. The adsorption of PFCAs and Cr (VI) was significantly influenced by the initial pH compared to the sorption of PFSAs. Additionally, the viologen based sorbent also showed better photocatalytic hydrogen evolution activity. In summary, these results revealed the outstanding adsorption capacity and convenient regeneration process make the adsorbent as a promising candidate for efficient and rapid removal of PFASs from other pollutants.