COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yuerong Wang,Youqing Sun,Yao Zhao,Dan Liu,Baozhong Zhang,Alex T. Kuvarega,Bhekie B. Mamba,Jianzhou Gui
In this study, functionalized carbon dots were synthesized in one step from L-histidine and imidazolyl ionic liquids using an ionic liquid-assisted microwave method as green corrosion inhibitors for steel in a 1 M HCl solution. Different ionic liquid anions (CF 3 COO - and HSO 4 - ) were introduced in the preparation of the carbon dots , and their microstructures and surface properties were characterized. Notably, the corrosion inhibition efficiency of the prepared CDs (assisted by CF 3 COO - ) reached 94.2% at 5 mg‧dm −3 . The corrosion inhibition behavior of CDs on mild steel in 1 M HCl was investigated through DFT calculations . Our investigation revealed that the anions of the selected ionic liquids have a certain influence on the structure of the carbon dots, which correlates with the performance of the carbon dot corrosion inhibitor. Therefore, this study provides guidance for the preparation of functionalized carbon dot corrosion inhibitors using a one-step microwave method and the selection of ionic liquids (as solvents, modifiers, and mediums for microwave conversion).
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Qian Jia,Xiaobo Wang,Zhuang Xu,Chao Ju,Bingbing Lai,Bo Dai,Yongqin Han
Shear thickening fluids (STFs) have attracted increasing attention as smart materials with unique rheological properties. However, the preparation of STFs usually relies on a composite system of spherical nanoparticles with polyethylene glycol . In this work, novel multi-phase STFs (ILSTFs) were prepared in an ionic liquid by incorporating nanosized SiO 2 and rod-shaped calcium metasilicate (CaSiO 3 ) particles as a dispersed phase . Compared to traditional STFs, ILSTFs demonstrate excellent thermal stability. Rheological tests indicate that ILSTFs exhibit continuous shear thickening behavior, resulting in excellent energy absorption and impact wear resistance. In addition, ILSTFs can serve as a new type of lubricant. The tribological properties and impact resistance of ILSTFs were highly correlated with the shear thickening effect, with the multi-phase ILSTF system with CaSiO 3 demonstrating superior impact wear resistance compared to the single-phase system. In this study, finite element analysis (FEA) is further utilized to investigate the local damage evolution and energy absorption rate of STF under impact loading , providing insights into the underlying mechanism. This ionic liquid-based STF holds promise for applications as a flexible filling component in the fields of lubrication technology and impact protection structures.
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FUEL
·
2017
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IF 4.601
Yichun Dong,Chengna Dai,Zhigang Lei
Methylal is used as an important synthetic fuel blended with diesel oil to reduce the particulate emissions of toxic gas pollutants without affecting the energy density. The mixed entrainers (dimethylformamide (DMF) + ionic liquid (IL)) are proposed to replace conventional DMF for the separation of methylal and methanol by extractive distillation. [EMIM] + [Ac] − might be the most promising entrainer screened by COSMO-RS model considering relative volatility and solvent capacity together. Vapor–liquid equilibrium (VLE) experiments demonstrated that the relative volatility of methylal to methanol is obviously improved after the addition of [EMIM] + [Ac] − into DMF. Moreover, the UNIFAC-Lei model was extended to the methylal-methanol-DMF-IL system, and the corresponding interaction parameters were obtained and input into the equilibrium (EQ) stage model established in this work. Based on the thermodynamic study, process simulation was developed. It was found that the overall heat duty of reboilers decreased 9.25% using the proposed mixed entrainers when compared to pure DMF. In addition, the COSMO-RS model and DFT calculation provide some theoretical insights into the separation mechanism.
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GREEN CHEMISTRY
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2018
·Vol. 20
·期 4
·903-911
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IF 8.586
Jian Chen,Mingmei Zhong,Lin Tao,Lina Liu,Sanjeevi Jayakumar,Chunzhi Li,He Li,Qihua Yang
The cooperation of catalyst and co-catalyst, together with efficient recycling, is one of the most important and still big challenges for CO2 cycloaddition reaction. Herein, we report a facile and atom-efficient method to synthesize a porous zinc-porphyrin-based framework (P-POF-Zn) as a catalyst for the synthesis of cyclic carbonates. It was demonstrated for the first time that the combination of P-POF-Zn and thermal-responsive ionic liquid [CPeDMAPy]Br (soluble in PO and PC at high temperature but not at room temperature) could efficiently catalyze the cycloaddition reaction of CO2 and propylene oxide to afford a turnover frequency of 433 h−1. The high catalytic activity is mainly attributed to the efficient cooperation of P-POF-Zn (Lewis acid site) and [CPeDMAPy]Br (nucleophile). Both P-POF-Zn and [CPeDMAPy]Br could be fully recovered after reaction by simple filtration for stable recycling. This work demonstrates the efficiency of the combination of thermal-responsive reagents with solid catalyst for catalyzing chemical reactions via a cooperation activation pathway.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
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IF 6.578
Qian Yang,Chen Xiao Lin,Fang Hua Liu,Ling Li,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To improve the overall performance of anion exchange membranes (AEMs) for fuel cells, a series of composite AEMs was prepared via a facile approach using ionic liquid-functionalized graphene oxide (IL-GO) and imidazolium-functionalized poly (2,6-dimethyl-1,4-phenylene oxide) (ImPPO). The prepared ImPPO/IL-GO-0.5% (0.5% refers to the weight percentage of IL-GO) membranes with an ionic exchange capacity (IEC) of 1.9 meq g −1 achieved a hydroxide conductivity of 78.5 mS cm −1 . The high conductivity of ImPPO/IL-GO-0.5% is due to the fact that the ionic cluster size of composite membranes (3.43–3.58 nm) is larger than that of the pristine membrane (3.30 nm). The ionic cluster morphology is confirmed by atomic force microscopy (AFM) and small angle X-ray scattering (SAXS). Moreover, the AEMs retained approximately 70% of their initial hydroxide conductivity after the alkaline stability test in a 2 M aqueous NaOH at 80 °C for 480 h, indicating a good alkaline stability. A single cell using ImPPO/IL-GO-0.5% exhibits a peak power density of 136 mW cm −2 at 60 °C under 100% related humidity, thereby having a great potential for fuel cells.
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JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 53
·期 7
·4927-4938
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IF 2.599
Liu Ran,Zhang Juan,Xu Zhice,Zhao Dishun,Sun Shuang
Iron phthalocyanine (PcFe) was loaded on Ti-MCM-41 as visible light photocatalyst (R-PcFe/Ti-MCM-41). Dibenzothiophene (DBT) was photooxidized using R-PcFe/Ti-MCM-41 as a photocatalyst, air as an oxidant, and ionic liquid as the extraction agent during visible light irradiation at room temperature and ambient conditions. The results indicated that photocatalytic efficiency of the amino iron phthalocyanine (NH 2 -PcFe)/Ti-MCM-41 was superior to the other substituent groups. The DBT content in the model oil decreased from 1000 to 44 μg/mL with 95.6% removal rate under the optimal reaction conditions (model oil 10 mL, photocatalyst NH 2 -PcFe/Ti-MCM-41 0.02 g, loading amount of NH 2 -PcFe 0.3 g/g, air flow rate 100 mL/min, reaction time 2 h, room temperature). The kinetics of photocatalytic oxidation of DBT follows first-order kinetics with a rate constant of 1.319 h −1 and halftime of 0.525 h. The photocatalyst NH 2 -PcFe/Ti-MCM-41 was reused for five times, and the catalytic activity decreased slightly. The photocatalytic oxidation system demonstrated significant desulfurization effects on different sulfur compounds and real gasoline, and the sulfur content of the actual gasoline could be reduced from 1000 to 78 ppm.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2017
·Vol. 410
·期 2
·595-604
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IF 3.431
Jia Man,Yang Jian,Sun Ya Kun,Bai Xi,Wu Tao,Liu Zhao Sheng,Aisa Haji Akber
We aimed to improve the imprinting effect of ionic liquid molecularly imprinted polymers (MIPs) by use of a molecular crowding agent. The ionic liquid 1-vinyl-3-ethylimidazolium tetrafluoroborate ([VEIm][BF 4 ]) was used as the functional monomer and aesculetin was used as the template molecule in a crowding environment, which was made up of a tetrahydrofuran solution of polystyrene. The ionic liquid MIPs that were prepared in the crowding environment displayed an enhanced imprinting effect. NMR peak shifts of active hydrogen of aesculetin suggested that interaction between the functional monomer and the template could be increased by the use of a crowding agent in the self-assembly process. The retention and selectivity of aesculetin were affected greatly by high molecular crowding, the amount of high molecular weight crowding agent, and the ratio of [VEIm][BF 4 ] to aesculetin. The optimal MIPs were used as solid-phase extraction sorbents to extract aesculetin from Cichorium glandulosum . A calibration curve was obtained with aesculetin concentrations from 0.0005 to 0.05 mg mL −1 (correlation coefficient R
2 of 0.9999, y = 1519 x + 0.0923). The limit of quantification was 0.12 μg mL −1 , and the limit of detection was 0.05 μg mL −1 . The absolute recovery of aesculetin was (80 ± 2)% ( n = 3), and the purity of aesculetin was (92 ± 0.5)% ( n = 5). As a conclusion, molecular crowding is an effective approach to obtain ionic liquid MIPs with high selectivity even in a polar solvent environment.
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PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 13
·7179-7185
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IF 2.936
Ruiyun Li,Heyuan Song,Guoqin Wang,Jing Chen
Ketalization of cyclohexanone with glycol has been carried out using molecular sieve SBA-15 immobilized Brønsted acidic ionic liquid catalyst. The properties of the heterogeneous catalysts were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), thermogravimetry/differential scanning calorimetry (TG/DSC), and N2 adsorption–desorption (BET). The results suggested that Brønsted acidic ionic liquid [BSmim][HSO4] had been successfully immobilized on the surface of SBA-15 and the catalytic performance evaluation demonstrated that the catalyst BAIL@SBA-15 exhibited excellent catalytic activities in the ketalization of cyclohexanone with glycol. In addition, the effects of reaction temperature, catalyst loading, reaction time, and reactant molar ratio have also been investigated in detail, and a general reaction mechanism for the ketalization of cyclohexanone with glycol was given. The SBA-15 immobilized ionic liquid can be recovered easily and after reusing for 5 times in the ketalization reaction, the catalyst could still give satisfactory catalytic activity.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Junxi Lei,Limin Deng,Zongda Chen,Xiang Li,Kaixin Li,Jong-Min Lee
Saccharification serves as the entry point for the biomass into biorefinery schemes and plays a vital role in lignocellulose transformation towards bio-fuels and platform molecules. Herein, an efficient in situ saccharification of lignocellulose under the mediation of ionic liquid of [DMIM]DMP is reported, using a series of magnetically-separable biochars as catalyst supports with immobilized endoglucanase Cel5A. The physicochemical properties of these magnetic biochars with immobilized endoglucanase (abbreviated as MBIE) were thoroughly characterized by FTIR, TG, SEM/EDX, XRD, XPS, N 2 physisorption, UV–vis and VSM. The results revealed that the endoglucanase, which functions as the catalytically active species, was immobilized on the biochar via simultaneous physical adsorption and covalent attachment. The extremely high surface area of biochar endows a high loading of endoglucanase and easy diffusion of reactant within the catalyst’s framework. The zeta potential of the catalyst was − 7.06 mV, indicating its excellent stability. MBIE with immobilizing endoglucanase of 484.36 mg/g exhibited the superior performance under a biphasic system (IL/water v/v 5:1), affording a glucose yield of 932.5 mg/g. The activity of MBIE remained constant after 10 consecutive cycles via magnetic recycling. This work demonstrates an efficient in situ saccharification process catalyzed by the developed MBIE with high activity and excellent regeneration ability.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Yankun Li,Airong Xu,Haitao Liu,Chu Cheng,Chen Chen,Kexing Song,Jing Tian,Yingang Guo,Weiwei Lu
In the process of fabricating high-purity copper, the high silver (Ag) content in copper plates poses a significant impurity issue, adversely affecting the quality and appearance of cathode copper, such as purity and surface finish. Moreover, it diminishes the electrolytic efficiency during production and escalates costs. This study successfully reduced the silver content in cathode copper from 7 g/t to 4.5 g/t by employing 1-aminopropyl-3-methylimidazolium chloride ([C 3 NH 2 CIm][Cl]) as an single yet multifunctional additive to regulate the copper electrolytic refining process, thereby enhancing the purity of the cathode copper. The cathode copper products and anode slime prepared were characterized and analyzed using techniques such as SEM, XRD, and XPS. The findings indicated that [C 3 NH 2 CIm][Cl] exerts a flocculation effect on anode slime during electrolysis, mitigating the adhesion and inclusion of suspended anode slime in cathode copper. Furthermore, the silver decreasing efficacy of [C 3 NH 2 CIm][Cl] in the copper electrolytic refining process was investigated through electrochemical characterization. It was observed that [C 3 NH 2 CIm][Cl] can react with Ag + to form precipitates, thereby reducing the concentration of Ag + in the solution. Additionally, [C 3 NH 2 CIm][Cl] can complex with Ag + , elevating the electrode potential of Ag + during the electrolytic refining process, making it less likely for Ag + to be reduced at the cathode under comparable conditions. This research provides an effective additive strategy for improving the purity and production efficiency of copper.
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POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Yi Zhou,Zhiliang Huang,Bangjun Deng,Chunli Gong,Hai Liu
Anion exchange membranes (AEMs) are the core components of fuel cells, playing a dual role in blocking anode/cathode and conducting OH − ions. In order to address the trade-off between ion conductivity and mechanical property of AEMs, imidazole ionic liquid-grafted cellulose nanocrystals (IL@CNC) was prepared and used as a novel one-dimentional nanofiller to modify quaternized chitosan (QCS) and polyvinyl alcohol (PVA) blend polymer matrix to obtain IL@CNC/QCS-PVA composite membranes. The uniform dispersion of IL@CNC and the strong interaction between nanofillers and polymer matrix significantly increased the tensile strength and toughness. Moreover, with the help of 1D shape of CNC together with the grafted imidazole groups, highly-effective ion transport channels were formed inside the membrane, and ion exchange capacity was also increased, thereby sharply improving the ionic conductivity of the composite membranes. The membrane containing 4% IL@CNC demonstrated the ionic conductivities of as high as 29.3 and 76.5 mS cm −1 at room temperature and 80°C, respectively, which were 4.0 times and 3.6 times higher than those of the pure membrane under the same condition. The as-prepared composite membranes containing the biopolymer and functionalized natural nanocellulose are expected to be used as a novel type of biomass-based AEMs. Highlights Imidazole IL grafted CNC was used as a novel 1D nanofiller to modify QCS-PVA. The membrane had high ionic conductivity and mechanical properties. Providing a new way to design biomass-based AEMs with high performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Han Sun,Shuang Wang,Xiaorui Wang,Feng Pan,Chenglong Li,Di Yu,Yu Luo,Zhe Wang
For further enhance the proton conductivity and long-term performance of the BOPBI (branching ratio of 6%) with rigid triazine structure with large free volume, a large volume of positive polymeric ionic liquid that can be crosslinked is introduce into the system, and then KH-560 crosslinker with 3% quality fraction is introduced into the system. When the CBOPBI-PIL-X membranes are soaked in KOH solution, The proton conductivity of CBOPBI-PIL-X membranes (X = 0%–40%) was great enhanced due to the formation of ion-pairs (X + - H 2 PO 4 − ), which can be used as both a proton donor and receptor, providing a binding site for proton transmission. Since the high free volume provided by the branched structure can help the membrane absorb more phosphoric acid, and the unique mechanism of action of PIL can provide new proton transport channels, among these membranes, the ultimate tensile strength (4.68 MPa) of PA-doped CBOPBI-PIL-30% film was great and the membrane can also gain excellent proton conductivity (155.8 mS cm −1 at 180 °C). Due to the addition of KH-560, the Si-O-Si crosslinking network can resist the oxidative free radical attack effectively, which substantially improves the oxidation stability of membranes. After 144 h of testing, all CBOPBI-PIL-X membranes are not broken. And after 240 h of acid retention testing at 160 °C/0% RH condition, the best PA retention ratio of CBOPBI-PIL-X membranes can still reach 83.7%, which can prove that the membranes have excellent performance. Therefore, CBOPBI-PIL-X membranes are expected to be used in high-temperature proton exchange membranes (HT-PEMs).
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危险品化学品经营许可证（带存储）