EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Xue Lv,Aowei Lv,Song Tian,Ting Xie,Shulin Sun
The design and fabrication of functional hydrogel materials for catalysis environmental pollutants has gained immense interest. However, fabricating a hydrogel with both excellent mechanical and catalytic properties remains a challenge. Herein, we successfully achieved polyacrylamide/dimethylaminoethyl methacrylate bromododecane p(AM/DMLB) hydrogel with poly(ionic liquids) microspheres as toughened point and catalytic sites. Under the dual effect of ionic crosslinking network and hydrophobic association network, p(AM/DMLB)/PILs-MPs hydrogels exhibit excellent mechanical properties, such as the tensile strength (1.38 MPa), elongation (2000%), and toughness (1.15 MJ∙m −3 ). Simultaneously, the hydrogel could act as a template for loading of Pd nanoparticles without the addition of other additives and crosslinking agents. The metal-loaded composite hydrogels exhibits excellent catalytic property in the reduction of 4-nitrophenol (4-NP) reaction, and reduction rate constants (K app ) was 0.226 min −1 . The strategy offers a novel economically feasible route to catalytic use in the sewage-disposal industry.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 47
·24975-24984
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IF 14.511
Lili Gong,Zhili Cai,Qi Wu,Lu Liu,Can Wang,Linglong Shan,Xianghai Meng,Shuangjiang Luo,Zhichang Liu,Suojiang Zhang
Mixed matrix membranes (MMMs) are highly promising for natural gas sweetening due to their high microporosity and outstanding gas separation performance. However, MMMs are frequently challenged by the polymer/filler interfacial incompatibility, leading to the deterioration of gas separation performance. In this study, the mixed-linker ZIF-7-8 was employed as a filler by finely tuning the molecular sieving for CO2/CH4 separation. An amino-functionalized ionic liquid ([C3NH2Mim][Cl]) was introduced for constructing the interface connection between the ZIF-7-8 filler and polymer matrix through coordination and hydrogen bonding, which was verified by extended X-ray absorption fine structure (EXAFS) and electron paramagnetic resonance (EPR). The design of interface interaction through an IL is crucial to improve the interface compatibility and the CO2/CH4 separation performance. The newly developed 20% ZIF-7-8-IL (1%)/PI and 25% ZIF-7-8-IL (1%)/PI MMMs displayed a dramatic improvement of CO2 permeability by 244.2% and 291.6%, from 308 to 1060 and 1206 barrer, respectively, for pure-gas separation, compared to the pristine polyimide matrix. Moreover, the 25% ZIF-7-8-IL (1%)/PI MMM also demonstrated outstanding low-temperature mixed-gas CO2/CH4 separation performance in the temperature range of −45–35 °C, far beyond the 2018 mixed-gas CO2/CH4 upper bound.
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MOLECULES
·
2022
·Vol. 27
·期 20
·6800
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IF 4.927
Moju Li,Xusheng Dai,Aifeng Li,Qi Qi,Wenhui Wang,Jia Cao,Zhenting Jiang,Renmin Liu,Hongbo Suo,Lili Xu
Enzymes are difficult to recycle, which limits their large-scale industrial applications. In this work, an ionic liquid-modified magnetic metal–organic framework composite, IL-Fe3O4@UiO-66-NH2, was prepared and used as a support for enzyme immobilization. The properties of the support were characterized with X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) spectra, transmission electron microscopy (TEM), scanning electronic microscopy (SEM), and so on. The catalytic performance of the immobilized enzyme was also investigated in the hydrolysis reaction of glyceryl triacetate. Compared with soluble porcine pancreatic lipase (PPL), immobilized lipase (PPL-IL-Fe3O4@UiO-66-NH2) had greater catalytic activity under reaction conditions. It also showed better thermal stability and anti-denaturant properties. The specific activity of PPL-IL-Fe3O4@UiO-66-NH2was 2.3 times higher than that of soluble PPL. After 10 repeated catalytic cycles, the residual activity of PPL-IL-Fe3O4@UiO-66-NH2reached 74.4%, which was higher than that of PPL-Fe3O4@UiO-66-NH2(62.3%). In addition, kinetic parameter tests revealed that PPL-IL-Fe3O4@UiO-66-NH2had a stronger affinity to the substrate and, thus, exhibited higher catalytic efficiency. The results demonstrated that Fe3O4@UiO-66-NH2modified by ionic liquids has great potential for immobilized enzymes.Keywords:metal–organic framework;magnetic nanoparticles;lipase;ionic liquids;immobilization
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TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Bairun Chen,Lisha Liu,Chunli Zhang,Shengmao Zhang,Yujuan Zhang,Pingyu Zhang
Protic ionic liquid-modified nanosilica (SiO 2 -PIL) hybrid with excellent dispersion stability and thermal stability was prepared. The SiO 2 -PIL hybrid was used as a high temperature antiwear additive for pentaerythritol ester (PE) base oil, which exhibited better antiwear ability and load-carrying capacity at high temperature compared with triphenyl phosphate (TCP). This is attributed to the synergistic friction-reducing and antiwear effects of nanosilica and ionic liquid during sliding at elevated temperatures. Findings indicate that a protective tribofilm with sandwich structure composed of phosphate and amorphous carbon as the outer layer and silica nanoparticles as the interlayer was formed on the worn surface. Finally, combined with the adsorption behavior and the results of worn surface analysis, the high-temperature lubrication mechanism of SiO 2 -PIL was proposed.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yuanchao Pei,Yaxin Zhang,Jie Ma,Yang Zhao,Zhiyong Li,Huiyong Wang,Jianji Wang,Ran Du
Development of porous adsorption materials tethered with functional groups was favorable to establish a more efficient, stable and broad-spectrum metal ions removal strategy from water. In this work, carboxyl functional poly(ionic liquid)s@MOF composites were prepared through in situ polymerization of ILs monomers inside MOF pores. Their thermophysical property, structure and morphology were characterized by different techniques. These PILs@MOF composites were proposed as universal and efficient adsorbents to remove selected rare earth metal ions (La 3+ , Sm 3+ , Nd 3+ ) and heavy metal ions (Pb 2+ , Cd 2+ ) from water medium. Effect of pH value and composite dosage on the adsorption efficiency were studied in detail. The optimized adsorption efficiency as high as 99.8 % could be found for the selected metal ions by PIL@MIL-101. In addition, the isotherms, kinetics and thermodynamic parameters of the adsorption process were also determined, and these results imply that the Langmuir model and pseudo-second-order model fitted well with the experimental data. Thermodynamic parameters revealed spontaneous and exothermic nature of the adsorption process. A plausible mechanism for the adsorption process was suggested by the electrostatic interaction and coordination between the carboxyl group and metal ions with the aid of FTIR and XPS measurements. Finally, recycling experiments were performed to demonstrate the recyclability and stability of PIL@MOF composites undergoes at least five adsorption–desorption runs. The current research presented a series of poly(ionic liquid)s@MOF composites as a universal adsorption platform that demonstrated great potential for removing metal ions with remarkable efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qiang Li,Chao Wu,Bingjian Zhang
Exploring effective and sustainable antibacterial agents to combat the bacterial contamination of cultural-heritage objects is an important issue. In this work, inspired by the broad applications of hydrogels in the biomedical field, a hybrid hydrogel was fabricated from the supramolecular assembly of polyvinyl alcohol (PVA), branched polyethylenimine (PEI), polydopamine nanoparticles (PDA NPs), and a phosphonium-based ionic liquid (IL), which was denoted as PVA-PDA@PEI-IL. Branched polycationic PEI interacted electrostatically with the negatively charged bacterial membranes, ultimately resulting in cell lysis and death. The released phosphonium-based IL disrupted the bacterial membranes and subsequently eradicated adhered and nearby bacteria. Although the PDA NPs displayed a high photothermal conversion efficiency, local hyperthermia did not appear to enhance the antibacterial activity of the prepared hydrogel. In addition, we also verified the significant antibacterial activity of the resulting hydrogel against the bacterial biofilms that adhered to the different substrate material surfaces. Therefore, our work presented the possibility of potential applications of these antibacterial hydrogels for cultural heritage conservation.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shuangfei Xiang,Xiaojie He,Feng Zheng,Qinghua Lu
Ionogel, with high transparency, excellent mechanical properties, and notable recoverability is an up-and-coming material for making skin-like iontronic devices. Herein, a pure ionic liquid design strategy is proposed for preparing tough ionogel material by one-pot copolymerization of two polymerizable ionic liquids, 1-vinyl-3-butylimidazolium tetrafluoroborate ([VBIm][BF 4 ]) and 1-dodecyl-3-vinylimidazolium tetrafluoroborate ([C 12 VIm][BF 4 ]), in a non-polymerizable ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF 4 ]). Experiments and theoretical simulations confirm the important role of an ionic liquid-phobic “microdomain” made-up of the long alkyl chains of [C 12 VIm] + in the improvement of mechanical properties. Due to a synergistic effect of the ionic liquid-phobic microdomains, ionic bond interactions, and molecular entanglement, the resultant ionic-liquid-based ionogels (IL-PILs-IG) show good mechanical properties (tensile stress ca. 4.5 MPa, tensile modulus ca. 3.2 MPa), excellent transparency (91%), high thermal stability (>300 °C), and good recoverability. Several IL-PILs-IG-based sensors are further developed. IL-PILs-IG-based resistive-type sensors show diverse sensory capabilities towards temperature, strain, and humidity. Capacitive-type sensors based on IL-PILs-IG exhibited a low detection limit as low as 25 Pa, and showed no deviation over 1,000 loading/unloading cycles. This study might provide a new path for designing and fabricating ionogels with good mechanical properties, transparency, and excellent fatigue resilience for skin-inspired ionic conductive sensors in detecting complex human motions.
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HYDROMETALLURGY
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2022
·
IF 4.217
Yu Deng,Yi Zhang,Yigang Ding
Recovery and separation of rare earth elements was highly crucial but difficult. In this study, a well-designed new ionic liquid named as benzyltributylammonium decanedioate ([N 444Bn ] 2 [SA]) was developed to extract rare earths and separate Sm(III) from the spent SmCo magnets in acetate medium for the first time. To exhibit the superiority of acetate medium, the extraction of Nd(III) and La(III) in three different media were comparatively investigated under different conditions, including equilibrium time, initial pH of aqueous solution, rare earth concentration, extractant concentration, salting-out agent concentration and extraction temperature. The results revealed that the better extractabilities of La(III) were observed in acetate medium rather than those in chloride medium (i.e., 97.6% versus 78.6%), which may be attributed to the low-hydrated nature of acetate ions. Importantly, the back-extraction experiments indicated that 91.4% Nd(III) can be stripped from [N 444Bn ] 2 [SA] by using 1.5 mol/L HOAc, revealing the outstanding reusability of ionic liquid in the industrial separation-stripping cycles. Furthermore, the ion association mechanism was proposed to describe the extraction behavior and confirmed by the slope analysis and FT-IR characterizations in three media. In terms of the SmCoCu mixture separation, the maximal separation factor of Sm(III)/Co(II) was calculated as 3078 in simulated solution. Impressively, the recovery of Sm(III) from the actual SmCo magnets by our dicarboxylate-type ionic liquid was also successfully achieved with a recycling rate of 96.8% and a Sm(III)/Co(II) selectivity of 148, which exhibited the potential application in the separation of Sm(III) from the spent SmCo magnets.
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Applied Water Science
·
2022
·Vol. 12
·期 3
·1-11
·
IF 5.411
He Ting,Li Xiaogang,Wang Qian,Zhou Yue,Wang Xiaozu,Wang Zhaohui,Tavajohi Naser,Cui Zhaoliang
In this paper, ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate was the first time successfully utilized as single solvent in preparing the PVDF membrane with a good performance by N-TIPs method. The effects of quenching temperature and hydrophilic additive content on the morphology, permeability, and strength of the membranes were studied. All the prepared PVDF membranes were proved to be a pure β phase by FTIR and XRD, possessing a narrow pore size distribution. By adjusting quenching temperature and additive content, membranes with a flux of 383.2 L/m 2 h and concentrated pore diameter of 26 nm obtained.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Chengjie Wang,Tian Lan,Jimin Xu,Hui Liu,Xiangyang Liu,Maogang He
Thermal conductivity plays a critical role in the screening and designing of ionic liquids (ILs) with good thermoelectric performance. With the newly developed two-wire 3ω method proven to eliminate the end effect by introducing a reference wire to the traditional 3ω method, the influence of additional polar solvents (water, ethylene glycol and ethanol) and temperature on the thermal conductivity of three ILs (1-ethyl-3-methylimidazolium dicyanoamide, 1-butyl-3-methylimidazolium dicyanamide and 1-butyl-3-methylimidazolium trifluoromethansulfonate) are investigated. It shows that the thermal conductivity of the three ILs can be reduced by the polar solvents with lower thermal conductivity. The negative temperature dependence of the thermal conductivity of three ILs is changed to be positive by water and weakened by ethylene glycol, but hardly affected by ethanol which also exhibits the negative trend. Experimental thermal conductivities are correlated by the second-order Scheffé polynomial with the average absolute relative deviations lower than 1.9%.
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Biomaterials Science
·
2022
·Vol. 10
·期 7
·1795-1802
·
IF 7.59
Pan Liu,Kai Jin,Yuange Zong,Meng He,Chunfeng Lu,Huiyue Li,Yanying Wang,Chunya Li
The treatment and care of diabetic wounds remains a global challenge due to the high rates of amputation, recurrence, and mortality. It has been proven that electrical stimulation has a positive effect on promoting diabetic wound healing. Hyaluronic acid is an acidic mucopolysaccharide that exhibits important physiological functions in the body. However, it is not an ideal electrical substrate because of its poor electrical conductivity. In this work, a series of novel ionic liquid functionalized injectable and conductive hydrogels was prepared based on hyaluronic acid. The obtained hydrogels exhibited excellent electrical conductivity, flexibility and mechanical properties, and conferred significant antibacterial effects without the need for additional antibiotics. These hydrogels coupled with exogenous electrical stimulation can significantly accelerate diabetic wound healing compared with the commercial Tegaderm™ film.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuyan Guan,Lulu An,Yumei Chen,Mingbin Li,Jianchao Shi,Xianyun Liu,Yanping Fan,Baojun Li,Baozhong Liu
The design and construction of transition metal catalysts with high performance and low-cost characteristics are imperative for liquid hydrogen storage materials. In this study, we prepared ultrathin carbon-stabilized Co-doped Co x O y nanofilms (C–Co/Co x O y NFs) using an ionic liquid/water interface strategy for sodium borohydride (NaBH 4 ) hydrolysis. Owing to its two-dimensional (2D) NF structure and the protective effects of the composite carbon, the C–Co/Co x O y NF catalyst exhibited remarkable activity and durability for hydrogen generation from NaBH 4 hydrolysis. The hydrogen generation rate reached 8055 mL·min −1 ·g Co −1 (5106 mL·min −1 ·g Cat −1 ) and the catalyst could be recycled more than 20 times, surpassing most reported metal-based catalysts under comparable conditions. In addition, the exceptional 2D Co-based NF structures, with numerous active sites, assisted in the activation of NaBH 4 and water molecules, promoting hydrogen production. Thus, these results provided an in-depth understanding of hydrogen generation from NaBH 4 hydrolysis, and an effective strategy for rationally designing highly active and durable 2D NF catalysts.
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