MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
YanXiao Zhang,XiaoNing Gao,Nan Ma,Hong Zhou,Lu Feng
Diosgenin is an indispensable intermediate in the production of various steroid drugs. Conventional hydrolysis of sulfuric acid produces large amounts of acidic wastewater and has always faced stringent restrictions from environmental requirements. Here, UiO-66-NH 2 and its derivative of UiO-66-NH 2 -AT (AT = 3-amino-1,2,4-triazole) were synthesized, and these two compounds were further grafted with high-concentration CF 3 SO 3 H molecules to obtain the MOF-based solid superacids, namely UiO-66-NH 2 -[SO 3 CF 3 ] and UiO-66-NH 2 -AT-[SO 3 CF 3 ], respectively. They have been applied to the alcoholysis of total saponins to extract diosgenin, and the alcoholysis conditions, including the solid acid dosage, extraction temperature and extraction time, have been optimized by single-factor experiments. Subsequently, the alcoholysis conditions of UiO-66-NH 2 -AT-[SO 3 CF 3 ] with more prominent catalytic performance and cycle stability were further optimized by the response surface method, and under the optimum conditions, the diosgenin yield reached 20.8 %, which was close to the predicted value of 21.3 % and was superior to the conventional hydrolysis of sulfuric acid and our previously reported solid acids. Additionally, the alcoholysis pathways and alcoholysis mechanism of the total saponins catalyzed by UiO-66-NH 2 -AT-[SO 3 CF 3 ] have been proposed by the analysis of high-resolution electrospray mass spectrometry.
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高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202403878
·
IF 1.9
Haifeng Liao,Jianwei Guo
Graphical Three kinds of heteropoly acid-based ionic liquids with different Hammett acidity were prepared for the catalytic conversion of cellulose to levulinic acid, and the effects of different solvent systems on the catalytic reactions were investigated. The results showed that higher Hammett acidity was beneficial to increase the yield of levulinic acid, and GVL/H 2 O bi-phase solvent system was helpful to extract the product to the organic phase and promote the formation of levulinic acid. Levulinic acid is an important chemical intermediate, which has many applications in organic synthesis, industry, agriculture, and medicine. In this word, three kinds of heteropoly acid based ionic liquids ([IMPS]H 2 PW 12 O 40 、[PyPS] H 2 PW 12 O 40 [TEAPS] H 2 PW 12 O 40) were used to catalyze the one-pot conversion of cellulose to levulinic acid. [IMPS]H 2 PW 12 O 40 has the highest catalytic activity due to its strong Hammett acidity ( H 0 ). In addition, the effect of biphasic solvent systems on the conversion of cellulose to levulinic acid was also studied. The results showed that the GVL/H 2 O system could effectively promote the conversion of cellulose and increase the yield of levulinic acid. The yield of levulinic acid could reach 52.6% and the conversion rate of cellulose was 91.2% at 180 °C for 180 min under the GVL/H 2 O volume ratio of 1:1 with [IMPS]H 2 PW 12 O 40 as a catalyst at 1 Mpa N 2 and cellulose as raw material. And [IMPS]H 2 PW 12 O 40 can be recycled up to five times without significant performance loss. This study provides a promising method for efficiently converting cellulose and other biomass resources to levulinic acid extraction.
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Advanced Materials Technologies
·
2024
·Vol. 9
·期 12
·2400386
·
IF 6.4
Zifeng He,Yijie Liu,Ivan S. Babichuk,Zisen Zhou,Zhaohua Liu,Xiongbang Yang,Ruiliang Zhou,Yan Pu,Shuhao Li,Yu Chang,Terry Tao Ye,Zhaoli Gao,Jian Yang
Cough is a common symptom of various respiratory diseases. However, recognizing a subject's cough using acoustic imaging can be challenging due to the complexity of coughing and the vulnerability of acoustic acquisition to external interference. This research aims to address these issues by utilizing a flexible piezoelectric ionic liquid-doped poly(L-lactic acid) (PLLA) sensor to gather the pressure signals from the human surface. 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIm]TFSI) ionic liquid (IL) can enhance the piezoelectric performance of PLLA thin film, the corresponding output voltage, and impact sensitivity are improved to three times and 105.1% for the PLLA/IL thin film with 1 wt% IL, 140 °C annealing 2 h and four times drawing ratio. The effect of IL on the crystallization behavior and piezoelectric properties of thin films during their preparation is investigated. The flexible PLLA/IL sensor is integrated into a wearable electronic system which collects and transmits piezoelectric signals from cough-induced vibrations to the filter for denoising, then the acquired cough data are decomposed using the Empirical Mode Decomposition method and trained in a multi-layer perception model to detect human coughing. It's evident that the flexible piezoelectric PLLA/IL sensors can be applied to human coughing recognition and show great potential applications in intelligent healthcare.
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Wen-Li Bao,Jie Kuai,Hai-Yang Gao,Meng-Qi Zheng,Zhong-Hua Sun,Ming-Yang He,Qun Chen,Zhi-Hui Zhang
The synthesis of cyclic carbonates through cycloaddition reactions between epoxides and carbon dioxide (CO2) is an important industrial process. Metal–Organic Frameworks (MOFs) have functional and ordered pore structures, making them attractive catalysts for converting gas molecules into valuable products. One approach to enhance the catalytic activity of MOFs in CO2 cycloaddition reactions is to create open metal sites within MOFs. In this study, the amino-functionalized rare earth Gd-MOF (Gd-TPTC-NH2) and its ionic liquid composite catalysts (Gd-TPTC-NH-[BMIM]Br) were synthesized using 2′-amino-[1,1′:4′,1′′-terphenyl]-3,3′′,5,5′′-tetracarboxylic acid (H4TPTC-NH2) as the ligand. The catalytic performance of these two catalysts was observed in the cycloaddition reaction of CO2 and epoxides. Under the optimized reaction conditions, Gd-TPTC-NH-[BMIM]Br can effectively catalyze the cycloaddition reaction of a variety of epoxide substrates with good to excellent yields of cyclic carbonate products. Comparatively, epichlorohydrin and epibromohydrin, which possess halogen substituents, promote higher yields of cyclic carbonates due to the electron-withdrawing nature of Cl and Br substituents. Additionally, the Gd-TPTC-NH-[BMIM]Br catalyst demonstrated good recyclability and reproducibility, maintaining its catalytic activity without any changes in its structure or properties after five reuse cycles.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Xiaomin Li,Mingxia Sun,Yang Feng,Yanming Liu,Yanli Wang,Juanjuan Feng,Min Sun
A covalent organic framework (COF) was gown on porous silica with 1,3,5-tri(4-aminophenyl)benzene and 2,5-divinyl-1,4-phenyldiformaldehyde as monomers, and two ionic liquids were grafted to COF by a click reaction. The materials before and after the modification of ionic liquids were separately packed into solid-phase extraction columns (10 × 4.6 mm, i.d.), which were coupled with liquid chromatography to construct online analysis systems. The extraction mechanisms of polycyclic aromatic hydrocarbons, bisphenols, diphenylalkanes and benzoic acids were investigated on these materials. There were π-π, hydrogen-bond and electrostatic interactions on ionic liquid-functionalized sorbents. After the comparison among these materials, the best sorbent was used, and the analytical method was established and successfully applied to the detection of some estrogens from actual samples. For the analytical method, the detection limit was as low as 0.005 μg L −1 , linear range was as wide as 0.017–10.0 μg L −1 , and enrichment ratio was as high as 3635. The recoveries in actual samples were 70 %-129 %.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kaige Jia,Shaojuan Zeng,Guilin Li,Wei Liu,Yinge Bai,Xiangping Zhang,Tao Wang,Mengxiang Fang
As one of the main greenhouse gases, carbon dioxide (CO 2 ) excessive emission has brought a series of climate change and environmental concerns, especially vast majority of CO 2 emission from coal-fired flue gas due to characteristics of energy structure in China, so CO 2 capture from flue gas is crucial to achieve carbon neutrality and mitigate these problems. Functionalized ionic liquid (IL) hybrid solvents have been regarded as potential absorbents for CO 2 capture, but they still face great challenge how to simultaneously realize high CO 2 mass uptake, low energy consumption and great tolerance under flue gas situation. In this study, the diazole-functionalized IL (DZIL) 1-ethyl-3-methylimidazolium triazole ([Emim][Triz]) was synthesized and blended with N-methylimidazole (N-MI) to form novel DZIL binary anhydrous solvents for CO 2 capture from flue gas. The results indicated that the DZIL solvent ([Emim][Triz]/N-MI) with mass ratio of 90 wt%/10 wt% can not only absorb 0.112 g CO 2 /g absorbent under a feed of 15 % CO 2 in N 2 at 40 °C and 1 bar, but also shows lower regeneration energy consumption of 1.49 GJ/t CO 2 , which is 65 % less than that of 30 wt% MEA solution (4.28 GJ/t CO 2 ). Meanwhile, the results of impurities effect demonstrated that the presence of H 2 O can improve CO 2 capacity and keep good recyclability of DZIL solvents, CO 2 absorption and recyclability performance have almost no change in the presence of O 2 , but a decrease less than 10 % in the presence of SO 2 occurs due to strong interaction between SO 2 and DZIL. The mechanism analysis revealed that both cation [Emim] + and anion [Triz] − of the DZIL can react with CO 2 to form Emim-CO 2 and [Triz-CO 2 ] − , respectively, and the former plays a dominant role in CO 2 absorption. The presence of H 2 O attenuates the formation of Emim-CO 2 but promotes CO 2 absorption capacity by introducing a new pathway of [Triz] − reacting with H 2 O and CO 2 to form [HCO 3 ] − . This study provides a feasible thought for CO 2 capture from flue gas with functionalized IL as energy-efficient absorbents to solve environmental problems.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Ningbo Liu,Qinglun Che,Yi Li,Litian Hu,Jianjun Zhang,Songwei Zhang
In this work, two kinds of hydroxyl functionalized ionic liquids (ILs) 1-butyl-3-methylimidazole salicylate [BMIM][SA] and 1-butyl-3-methylimidazole caffeate [BMIM][CA] were synthesized as additives for titanium complex grease (TCG). Two ILs can effectively improve the physicochemical properties of TCG. Among them, [BMIM][CA] significantly improves the yield stress of TCG and improved its ability to resist deformation. Tribological tests showed that both ILs improved the friction reduction and antiwear properties. And [BMIM][CA] containing two adjacent phenolic hydroxyl group performed the best. This may be because it can effectively participate in tribochemical reactions, forming a large number of organic tribochemical products, which play a key role in promoting lubrication.
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CHIRALITY
·
2024
·Vol. 36
·期 4
·e23665
·
IF 2.8
Luzheng Dong,Jun Wu,Xiashi Zhu
In this paper, the amino acid chiral ionic liquid (AACIL) was prepared with L-phenylalanine and imidazole. It was characterized by CD, FT-IR, 1 H NMR, and 13 C NMR spectrum. The chiral recognition sensor was constructed with AACIL and Cu(II), which exhibited different chiral visual responses (solubility or color difference) to the enantiomers of glutamine (Gln) and phenylalanine (Phe). The effects of solvent, pH, time, temperature, metal ions, and other amino acids on visual chiral recognition were optimized. The minimum concentrations of Gln and Phe for visual chiral recognition were 0.20 mg/ml and 0.28 mg/ml, respectively. The mechanism of chiral recognition was investigated by FT-IR, TEM, SEM, TG, XPS, and CD. The location of the host-guest inclusion or molecular placement has been conformationally searched based on Gaussian 09 software.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yi Liu,Shaoyan Wang,Jiarui Liang,Lirong Lu,Yi Xie,Chengrong Qin,Chen Liang,Caoxing Huang,Shuangquan Yao
Demethylation modification of lignin is an effective strategy to overcome the barrier to its high-value conversion. The purpose of this study focuses on the new proton-based ionic liquid (PIL) 1, 2-propanediamine/glycolic acid (PD/GA) as a catalyst and solvent to achieve the targeted oxidation of lignin. The PD/GA solvents have higher selectivity and efficiency. Optimal phenolic hydroxyl (PH)-increment was achieved, demonstrating enhanced demethylating effect on lignin by modulating the acid-base molar ratio, reaction temperature, and reaction time. Compared to ethanolamine/acetic acid (CE/AC) treatment, the PD/GA treatment at molar ratio 1.25, temperature 60 °C, and 3 h increased the PH-content from 37.74 to 59.91 %. Additionally, the lignin treated with PD/GA exhibited excellent recyclability, featuring a larger Brunauer-Emmett-Teller surface area (1.45 m 2 .g −1 ), total pore volume (9.51*10 −3 cm 3 .g −1 ), and mesoporous size (26.15 nm). The treated lignin yielded maximum ultraviolet resistance and antioxidant activity. These results present new avenues for the development of green and efficient lignin demethylation methods.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen Li,Fang Wang,Jiaqi Liu,Jiajun Wang,Lingqi Deng
Hydrogels are widely used as functional smart materials in wearable electronics and other applications. However, limitations in certain properties restrict their broader utility. In this paper, halometallate ionic liquids, synthesized by combining ionic liquids (ILs) with metal Zn salts, were incorporated into glycerol to create supramolecular liquids. These served as functional auxiliaries for a composite hydrogel synthesized by combining a p(AM-co-HEMA) copolymer network with a macromolecular carboxymethylcellulose (CMC) interpenetrating network. Meanwhile, lignin nanoparticles (LNPs) facilitated the redox reactions with Zn ions and accelerated free radical polymerization. The composite hydrogel, exhibiting tunable mechanical properties due to abundant metal coordination and hydrogen bonding, demonstrates high tensile elongation at break (1300 %), excellent adhesion (462.3 kPa), freezing resistance (−60 °C), high moisture retention, significant temperature sensitivity (TCR = −11.47 %/°C at 20–35 °C), and good electrical conductivity (1.56 S/m). Its high sensitivity (gauge factor, GF = 5.78; pressure sensitivity = 13.74 kPa −1 ) and fast response time (0.1 s) further enhance its capabilities. Consequently, these multifunctional hydrogels find applications in strain, pressure, and temperature sensors, as well as in capacitive pens and energy generation. This research offers a pathway for integrating hydrogel-based electronics into intelligent human-computer interaction, information transmission, health monitoring, and traffic detection systems.
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ACS Catalysis
·
2025
·
IF 13.1
Shilun Wang,Wei Peng,Heliang Ma,Xingdi Pan,Yao Shen,Jingkai Zhao,Jiexu Ye,Qiaoli Wang,Pengfei Xie,Shihan Zhang,Xiang Gao
The electrocatalytic reduction of carbon dioxide (CO2RR) by copper oxide-based materials is conducive to the formation of high value-added products, but their activities and selectivities remain unsatisfactory. Organic ligand modification is a promising strategy to achieve a high CO2RR activity. Here, the modification of Cu2O with 1-butyl-3-methylimidazolium chloride (Bmim-Cu2O) enhanced the adsorption of reaction intermediates and improved the stability of the catalyst in the CO2RR, which displays a high Faradaic efficiency of ≈85% to C2+ products with a current density as large as ≈352.5 mA cm–2. In situ characterization reveals a stronger *CO signal with bridge configuration and a stronger *OCCHO signal over Bmim-Cu2O than unmodified Cu2O and can improve the stability during electrochemical CO2 reduction. Density functional theory calculations show that local molecular modulation can effectively regulate the electronic structure of Cu2O and enhance the adsorption of *CO and *CHO intermediates through the stabilization of a noncovalent interaction, which can greatly promote the asymmetric *CO–*CHO coupling in the electrochemical reaction process.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2316788
·
IF 18.5
Mingyang Zhong,Yang Wang,Yihua Xie,Shouyi Yuan,Kai Ding,Elijah J. Begin,Yingjie Zhang,Junwei Lucas Bao,Yonggang Wang
Owing to the intrinsically high safety, low cost, natural abundance, and high energy density of Zn metal, aqueous Zn ion batteries (AZIBs) have become a promising candidate for large-scale energy conversion and storage. However, the practical application of AZIBs is hampered by the severe Zn dendrites growth and the poor low-temperature performance due to the elevated freezing point of aqueous electrolyte. Herein, the study proposes a new kind of room-temperature liquid Zn salt, which is called Zn coordinated ionic liquid (i.e., (EMIM) 5 Zn(OTF) 7 ), for all-temperature AZIBs. The aqueous electrolyte containing 0.261 mol kg −1 (EMIM) 5 Zn(OTF) 7 in Ethylene Glycol (EG) / H 2 O (6:4) exhibits ultralow freezing point below −100 °C. The liquid Zn salt and EG molecules not only modulate the solvation structure of Zn 2+ ion, reducing the coordinated H 2 O in the first solvation sheath, but also suppresses the parasitic side reaction. As a proof of concept, Zn || Zn symmetric cells and Zn || PANI full cells with the designed electrolyte achieve improved cycling stability and can operate under wide temperature (from −40 to 60 °C). Even with high Zn utilization ratio of 40%, long cycle life over 70 times with capacity retention of 80% is achieved.
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危险品化学品经营许可证（带存储）