CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Xiaoyu Yang,Xuanxuan Lei,Shaokun Tang
A simple hydrothermal method is utilized to fabricate hierarchically olive-like γ -Al 2 O 3 using ionic liquid [Bmim]BF 4 as the structure directing agent . The olive-like γ -Al 2 O 3 presents uniform morphology with the average diameter of 500 nm and rich mesopores. As template, ionic liquid [Bmim]BF 4 plays a crucial role in the controllable morphology of the product. [Bmim]BF 4 is absorbed on the AlOOH nanoparticles surface via the H-bond interaction and induces crystalline oriented growth. Then the forming AlOOH nanosheets self-assemble into olive-like hierarchical structure through π–π stack interaction. Given that the structure advantage of the olive-like γ-Al 2 O 3 and the limited study concerning cerium-based catalysts in Fenton-like reaction, nano-CeO 2 / γ -Al 2 O 3 supported catalyst is prepared and used in Fenton-like degradation for the first time. The result suggests that the olive-like γ -Al 2 O 3 support not only reduces the surface energy with more uniform CeO 2 (ca. 4–5 nm) dispersion but also improve the concentration of Ce 3+ active sites. The CeO 2 / γ -Al 2 O 3 catalyst displays superior catalytic activity for the degradation of Orange II (AO7) compared with pure CeO 2 nanoparticles.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Huanhuan Wu,Yakai Lin,Wenyan Feng,Tianyin Liu,Lin Wang,Hong Yao,Xiaolin Wang
In order to utilize lithium from brines with high Mg 2+ /Li + ratio, a positively charged nanofiltration (NF) membrane was prepared by grafting amine-functionalized ionic liquid 1-(3-aminopropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([MimAP][Tf 2 N]) onto the surface of polyamide (PA) membrane. The effects of [MimAP][Tf 2 N] contents on the chemical composition, surface morphology , surface charges and separation properties of the modified PA membranes were discussed. The results of chemical composition analyses indicated reaction of the amine group of [MimAP][Tf 2 N] with the residual acyl chloride groups, which was existed on the surface of the nascent PA membrane. The surfaces of all the modified PA membranes were positively charged at pH = 6.4 due to the quaternary ammonium group of [MimAP][Tf 2 N]. In the separation process, the resulting membrane presented high water permeance (37.8 L/(m 2 ⋅h)) and mono-/divalent cation selectivity (Li + and Mg 2+ ) with much higher MgCl 2 rejection (83.8%) than LiCl rejection (24.4%). For a simulative brine with a Mg 2+ /Li + ratio of 20, the rejections to Mg 2+ and Li + by the optimized membrane (NF-IL-2.0%) were around 81.9% and −45.2%, respectively, where the permeate with the Mg 2+ /Li + ratio of 3.5 was obtained and the selectivity ( S Li,Mg ) was 8.12. Additionally, the optimized membrane exhibited a stable performance for Mg 2+ /Li + separation. Therefore, there is a very possibility for utilization of lithium from brine with high Mg 2+ /Li + ratio by using the optimized NF membrane.
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RSC Advances
·
2020
·Vol. 10
·期 7
·3756-3764
·
IF 3.119
Zhixin Zhao,Bei Lei,Wenhao Du,Zhaojie Yang,Danyang Tao,Yuanfang Tian,Jin Xu,Xi Zhang
1-Butyl-3-methylimidazole chloride ([BMIM]Cl) plasticized starch/poly(butylene succinate) (PBS) blends containing inorganic salts with different cations were prepared by a Haake mixer. The compatibility, thermal behaviors including crystallinity, crystallization temperature and melting temperature, thermal stability, and mechanical properties of these blends were systematically investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The results showed that the inorganic salts could interact strongly with [BMIM]Cl plasticized starch/PBS blends to improve their mechanical properties, while the thermal stability of the [BMIM]Cl plasticized starch/PBS blends was simultaneously reduced. The SEM results suggested that the compatibility of [BMIM]Cl plasticized starch and PBS was significantly improved with increasing inorganic salt content. Furthermore, by incorporating inorganic salts, the melting enthalpy (ΔHm), crystallinity (Xc), and cold crystallization temperature (Tcc) of the blends were decreased.
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2020
·Vol. 43
·期 12
·2459-2466
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IF 2.878
Yuanyuan Liu,Wenjuan Wang,Fenfang Che,Yanzhen Lu,Aoxin Li,Hao Li,Jiangang Liu,Yun Wei
Macleaya cordata (Willd) R. Br. is a medicinal plant. The most important bioactive compounds of M. cordata are alkaloids that have many biological activities including antifungal, anti-inflammatory, and antitumor. In this study, an ionic-liquid-modified high-speed counter-current chromatography method was established to obtain alkaloids from the fruits of M. cordata . The conditions of ionic-liquid-modified high-speed counter-current chromatography, including solvent systems, the content of ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate [C 4 mim][BF 4 ]), and the posttreatment of the ionic liquid, were investigated. Five alkaloids protopine, allocryptopine, sanguinarine, 8-O-demethylchelerythrine, and chelerythrine were separated from the extract of the fruits using a high speed counter-current chromatography with two-phase solvent system composed of dichloromethane/methanol/0.3 mol/L hydrochloric acid aqueous solution/[C 4 mim][BF 4 ] (4:2:2:0.015, v/v). Their purities were 96.33, 95.56, 97.94, 96.22, and 97.90%, respectively. The results indicated that a small amount of ionic liquids as modifier of the two-phase solvent system could shorten the separation time and improve the separation efficiency of the alkaloids from the fruits. The ionic-liquid-modified high-speed counter-current chromatography would provide a feasible way for highly effective separation of alkaloids from natural products.
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Theranostics
·
2020
·
IF 8.579
Chaoli Wang,Peng Chen,Youbei Qiao,Yuan Kang,Chaoren Yan,Zhe Yu,Jian Wang,Xin He,Hong Wu
Background : Biofilm infection caused by multidrug-resistant bacteria is difficult to eradicate by conventional therapies. Photodynamic therapy (PDT) is an effective antibacterial method for fighting against biofilm infection. However, the blocked photosensitizers outside of biofilm greatly limit the efficacy of PDT. Methods : Herein, a novel acid-responsive superporogen and photosensitizer (SiO 2 -P Ce6-IL ) was developed. Because of the protonation of the photosensitizer and the high binding energy of the polyionic liquid, SiO 2 -P Ce6-IL changed to positive SiO 2 -P IL + in an acidic microenvironment of biofilm infection. SiO 2 -P IL + could combine with negatively charged extracellular polymeric substances (EPS) and create holes to remove the biofilm barrier. To strengthen the interaction between SiO 2 -P IL + and EPS, SiO 2 -P IL + of high charge density was prepared by grafting the high-density initiation site of ATRP onto the surface of the SiO 2 base. Results : Due to the rapid protonation rate of COO - and the strong binding energy of SiO 2 -P IL + with EPS, SiO 2 -P Ce6-IL could release 90% of Ce6 in 10 s. With the stronger electrostatic and hydrophobic interaction of SiO 2 -P IL + with EPS, the surface potential, hydrophobicity, adhesion and mechanical strength of biofilm were changed, and holes in the biofilm were created in 10 min. Combining with the release of photosensitizers and the porous structure of the biofilm, Ce6 was efficiently concentrated in the biofilm. The in vitro and in vivo antibacterial experiments proved that SiO 2 -P Ce6-IL dramatically improved the PDT efficacy against MRSA biofilm infection. Conclusion : These findings suggest that SiO 2 -P Ce6-IL could rapidly increase the concentration of photosensitizer in biofilm and it is an effective therapy for combating biofilm infection.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Chaofeng Zhang,Yaozong Yang,Linfeng Li,Jiandong Zhang,Shuangping Huang,Ruifeng Li
Polyoxymethylene dimethyl ether (PODEn) is a promising ether fuel. Especially PODE3–5 can be directly mixed into diesel without modification of the diesel engine’s infrastructure for improving thermal efficiency, and significant reduction in particulate matter (PM) and nitrogen oxides (NOx) emissions. In this paper, a series of heterogeneous catalysts, the imidazole sulfonate ionic liquids (ILs) encapsulated in the cages of metal–organic frameworks (MOFs) MIL-100(Fe), were used successfully and efficiently in the synthesis of polyoxymethylene dimethyl ethers (PODEn) from methanol and trioxane (TOX). These catalysts have exhibited excellent catalytic properties because of strong Brønsted acid sites. MIL-100(Fe)@[BSO3HIm][CF3SO3] shows the best catalytic activity with 96.98% conversation of TOX and 47.49% selectivity of the desired product PODE3–5 under a mild reaction condition. Of importance is that the catalyst is recovered easily and reused.
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MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Chi Chen,Zhuang Fu,Weiying Zhou,Qiushi Chen,Chenzhao Wang,Lu Xu,Zhibing Wang,Hanqi Zhang
The ionic liquid-immobilized NaY zeolite was prepared by means of impregnation approach and used as the dispersant of matrix solid phase dispersion for the extraction of aloe-emodin, emodin, chrysophanol and physcion in Rheum palmatum L.. High performance liquid chromatography coupled with diode-array detection was used for the separation and determination of target analytes. The ionic liquid-immobilized NaY zeolite was further characterized by SEM, FT-IR, TG, XRD and BET. The experimental parameters, such as type and content of ionic liquid, mass ratio of sample to dispersant, type of washing solvent, and type and volume of elution solvent, were optimized. The results revealed that the prepared ionic liquid-immobilized NaY zeolite presents suitable properties and can be used as the dispersant of matrix solid phase dispersion for the extraction of anthraquinones. Good linearities ( r > 0.9995) were obtained in the range of analyte concentration investigated. The recoveries were 73–98% with the relative standard deviations lower than 6%. Compared with ultrasound-assisted extraction and heat reflux extraction, the present method requires less sample, organic solvent and extraction time. The present method can be applied to the determination of anthraquinones from medicinal plant.
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ANALYST
·
2019
·Vol. 144
·期 24
·7468-7477
·
IF 4.019
Xiaofei Ma,Zigui Kan,Yingxiang Du,Jiangxia Yang,Zijie Feng,Xinqi Zhu,Cheng Chen
This study deals with the nonaqueous capillary electrophoretic enantioseparation of twenty-two amino alcohol drugs with a maltobionic acid (MA)-based ionic liquid (tetramethylammonium maltobionic acid, TMA-MA) as the novel chiral selector. In consideration of the poor solubility of MA in organic solvents, we managed to transform MA into ionic liquids (ILs) for the first time. Interestingly, this chiral selector exhibited powerful enantioselectivity towards the model analytes in company with boric acid. Systematical experiments were carried out to investigate the influence of concentration of TMA-MA, boric acid and tris (hydroxymethyl) aminomethane (Tris) as well as applied voltage on the enantioseparation. A great majority of enantiomers (except labetalol) were baseline separated under the optimized conditions and the effect of the molecular structure of amino alcohol drugs on the chiral separation was discussed. In addition, electrophoretic experiments, nuclear magnetic resonance (NMR), mass spectrometry (MS) and molecular modeling with the Gaussian program were employed to demonstrate the mechanism of chiral recognition. Based on the formation of an ionic liquid-boric acid-analyte complex, hydrogen binding was mainly responsible for enantioseparation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Zi-ang Zhang,Quan Zhou,Yi-xin Lu,Run-ze Yang,Ge-bo Pan
The structure and morphology of foam-like GaN (F-GaN) was significant to the performances of nanodevices, especially optoelectronic devices. Here we present a reasonable way to regulate the surface roughness on F-GaN, by the change of H 2 O concentration in the etching system. Ionic liquid (ILs) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTF]) was used as the etchant for the photoelectrochemical etching (PECE) process. With the H 2 O concentration changed from 0 to 5 % in the etchant solution, the surface roughness of F-GaN was reduced from 57.6 to 34.6 nm. In addition, to describe the role of H 2 O in the etching procedure, a physical impact etching mechanism was proposed. These results further promoted the potential value of F-GaN in the optical field.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2023
·
IF 4.1
Guangzheng Ma,Zihan Zhang,Mei Chen,Yifei Zhang,Binbin Nian,Yi Hu
BACKGROUND The relative low stability, reusability and activity of enzymes made the industrial production of vitamin E succinate (VES) can only be performed with complex processes and high cost using chemical methods. To address these issues, in the present study, an ionic liquids (ILs) modification strategy was developed to improve the activity and stability of lipases in VES synthesis. RESULTS The results showed that the [1-butyl-3-methyl imidazole] [ N -acetyl- l -proline] ILs modified Candida rugosa lipase (CRL) has the highest modification degree (48.28%), activity (774 U g −1 ), thermostability and solvent tolerance in three selected modifiers. Additionally, after reaction condition optimization, the highest yield of VES can be improved to 95.18% at 45 °C for 15 h, which was significantly improved compared to some previous studies. CONCLUSION In the present study, a high-efficiency VES synthesis strategy was successfully developed via modification of lipase. Moreover, the mechanism by which ILs modification can enhance the activity and stability of lipase was investigated via both experimental and computational-aided methods. Molecular dynamics simulation suggested that ILs modification changed the geometry of Phe344 from flat to upright, which significantly reshaped and enhanced the size of substrate binding pocket of CRL. It is also agreement with our circular dichroism and fluorescence spectroscopy results, which suggested that the modification changed the secondary structure of CRL to a certain extent. The larger pocket also endowed the suitable binding pose of succinate, which made the hydrogen bonds between succinate and active site Ser209 become stronger, and thus improving the yield of VES. © 2023 Society of Chemical Industry.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qiuyu Xu,Mohan Hou,Lifang Wang,Xuepeng Zhang,Lifang Liu
The rapid development of the times has aroused the concern for the full usage of renewable resources and the sustainable development of the environment. Meanwhile, complex social activities have also put forward many requirements for sensor industry. Traditional hydrogel sensors are easy to lose water in daily environment and freeze at low temperatures, as well as being attacked by bacterial during repeated use, thus affecting the service life of the device, which are all problems to be solved by hydrogel flexible equipment. These urgent problems are crucial to the development of hydrogel flexible devices. In this work, starch/polyvinyl alcohol (PVA) is used as dual-network hydrogel substrate due to the advantages of renewable and biocompatibility. The internal compatibility of starch/PVA hydrogel is greatly improved by regulating the ratio of ionic liquid/ethylene glycol/water ternary solvent system. Multiple hydrogen bonding endows starch/ionic liquid/PVA ionic conductive hydrogel with high mechanical properties (tensile strain, modules and toughness of 1250.29 %, 1324.43 kPa, 9008.88 kJ m −3 , respectively), and excellent anti-freezing (-128.9℃), anti-bacterial and electrical conductivity. The assembled hydrogel sensor could effectively detect external stimulations such as strain/pressure. It also has high sensitivity characteristics over an ultra-wide strain range (GF = 0.99 below 55 %, 2.19 at 55 %–250 %, 2.49 at 250 %–650 %, and 3.28 at 650 %–1000 %), as well as stably recognize human movements and physiological signals. All in all, this work brings new inspiration for low-cost, environmentally adaptable, sustainable wearable flexible devices.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Ya Chu,Weiqiang Zhang,Yurong Guo,Guangjiu Zhao
Silica-coated perovskite quantum dots (QDs), which exhibit exceptional photophysical properties, hold great promise for various optoelectronic applications. Nonetheless, the issue of insufficient stability poses a significant challenge to their continued advancement and widespread adoption. Herein, we present a novel approach for the synthesis of silica-coated CH 3 NH 3 PbBr 3 (CH 3 NH 3 = MA) QDs with exceptional stability and luminescence, which utilized hydrophobic ionic liquids (ILs) with unlike alkyl chain lengths as surface ligands. As the alkyl chain length of the hydrophobic ILs increased, we observed a blue-shift in the wavelength and a reduction in the time required to reach maximum fluorescence for the silica-coated perovskite QDs . It not only effectively prevents QD aggregation but also accelerates the formation rate of the SiO 2 shell. The introduction of ILs generated the enhancement of photoluminescence quantum yield (PLQY) from 85% for the pristine sample to 92.83% for ILs treated C 16 -QDs@SiO 2 . Furthermore, the stability of the ILs-treated C 16 -QDs@SiO 2 was notably enhanced, with the fluorescence intensity retaining 80.5% after 40 days of storage. The as-prepared white light emitting diode (LED) displayed a high color rendering index (CRI) of 75.3 and a correlated color temperature (CCT) of 7529 K. This work provides an alternative strategy to solve the challenging stability issue of silica-coated perovskite QDs and promote the silica-coated perovskite QDs to the practical application in solid-state LEDs.
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危险品化学品经营许可证（带存储）