MICROCHIMICA ACTA
·
2012
·Vol. 177
·期 1
·237-243
·
IF 3.033
Fan Yunchang,Zhang Sheli,Yang Fanming,Niu Haibo,Shi Jiajia
We have prepared the hydrophobic amino-functionalized ionic liquid (IL) 1-(2-aminoethyl)-3-butylimidazolium hexafluorophosphate and investigated its extraction behavior for copper(II) ion as a model cation. The IL, due to the presence of an amino group, is capable of complexing Cu(II) in a ratio of 6:1. The parameters affecting the extraction efficiency were optimized. The IL-based liquid–liquid microextraction was successfully applied to the analysis of Cu(II) in an environmental water standard reference material. The results are promising in terms of liquid–liquid microextraction, separation, and preconcentration of Cu(II).
A hydrophobic amino-functionalized ionic liquid (IL) [NH 2 C 2 C 4 im][PF 6 ] was synthesized. The IL exhibits good extractability for copper (II) ion due to the presence of an amino group.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 16
·e55270
·
IF 2.7
Yongliang Guo,Haojun Zhang,Jinfeng Cui,Junhong Guo,Baoping Yang
It is of great importance to enhance ability of charring formation for polystyrene (PS) to overcome non-charring feature during burning. Here, we demonstrate a kind of ternary intumescent flame retardant composition composed by a novel ionic liquid butyltriphenylphosphonium-chelated orthoborates (IL) with self-expanded flame retardant, ammonium polyphosphate (APP) and expandable graphite (EG), to improve flame retardancy of PS. This ternary composition promotes limited oxygen index (LOI) value to 26.6 ± 0.5% and UL-94 V0 level for PS composite with 15 wt% total loading. In addition, the peak value of heat release rate and smoke production rate of PS composite with ternary composition are separately reduced by 79.7% and 70.7% comparing to neat PS as well as 44.4% and 29.2% to its IL-free binary counterpart in cone calorimeter test. Meanwhile, the ternary composition displays compact charring bulk constructed by large-expansion-volume vermiform expanded graphite. The TG-FTIR technique is used to analyze gaseous profiles. The rheological property discloses that expansion behavior of the ternary composition contributes to robust viscoelasticity of composite and advantageous network construction at high temperature. Given the fire performance of the ternary composition, the combination of IFR and IL provides an opportunity for rational design and fabrication of functional flame-retardant system.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Huangda Li,Jinhe Sun,Yongzhong Jia,Pengrui Zhang,Huiqun Ju,Lianjing Mao,Zhiyu Zhao,Xiao Li,Bo Li,Yan Jing,Fei Shao
Lithium isotopes with high abundances (6Li and 7Li) are crucial for the advancement of nuclear energy. In order to achieve the effective separation of 7Li, a Sudan I-[HMIm][BF4]-anisole extraction system was built employing Sudan I (1-benzeneazo-2-naphthol) as the extractant and hydrophobic ionic liquid [HMIm][BF4] as the co-extractant. By optimizing the organic and aqueous phase components, the extraction rate of the system could reach up to 26.30%, and the single-stage separation factor of the system could reach 1.015 ± 0.001. Meanwhile, the mechanism of the extraction process was investigated, and it was found that the ratio of Sudan I to lithium ions is 1 : 1, and the thermodynamic enthalpy change of the extraction process was less than zero (ΔH < 0), indicating that the extraction process of the system was an exothermic process. The construction of the Sudan-ionic liquid extraction separation system provides a new idea for the study of 7Li enrichment and separation and also provides a possibility for the industrialization of high-abundance 7Li enrichment.
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AICHE JOURNAL
·
2024
·
IF 3.5
Xueqi Sun,Shaojuan Zeng,Guilin Li,Yinge Bai,Minghua Shang,Jian Zhang,Xiangping Zhang
The selective separation of CO 2 from CH 4 -containing gases is crucial to produce clean energy gases. In this study, triazole anion-functionalized ionic liquids (TAFILs) were designed by combining low molecular weight cations with triazole anions containing N electronegative site and further mixed with physical solvents to form physicochemical absorbents. The results indicated that [Cho][Triz]/TMS (80 wt%/20 wt%) not only absorbs 0.125 g CO 2 /g absorbent equal to that of 30 wt% MEA solution at 40°C and 1 bar, but also has low enthalpy of −35.76 kJ/mol less than half of 30 wt% MEA solution. Simultaneously, a super high CO 2 /CH 4 selectivity of 191.0, higher than most of the reported absorbents, is obtained for [Cho][Triz]/TMS solvents. Such great performance of CO 2 separation was attributed to relatively weak chemical and physical interaction between CO 2 and TAFIL binary absorbents. This study may provide novel promising ionic liquid absorbents for CO 2 capture applications from clean energy gases.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Hao Zhu,Ping Zhang,Zhuoheng Tu,Xingbang Hu,Youting Wu
Chitosan (CS) is a potential membrane material for acid gas separation owing to its advantages of low cost, high biocompatibility, good film-forming property, and abundant amine groups. However, due to the strong hydrogen bonding network inside bulky CS, it has poor solvent processability and high membrane crystallinity leading to slow gas permeation. Herein, via alkylating primary amine on chitosan using 1-bromohexyl-3-methylimidazolium bromide ([Brhmim]Br), water-processable ionic liquid-grafted chitosan (ICS) membrane was fabricated for H 2 S separation. Furthermore, polyethylene glycol (PEG) was introduced into ICS to improve H 2 S separation performance owing to its good plasticizing ability and highly reversible hydrogen bonding interaction with H 2 S. The successful fabrication of ICS and ICS/PEG membranes was validated using various characterizations. Notably, H 2 S/CO 2 /CH 4 (20/20/60 vol%) mixed gas permeation test shows H 2 S permeability up to ∼1100 Barrer, with desired H 2 S/CH 4 (∼24) and H 2 S/CO 2 (∼11) selectivity obtained. Quantum chemical calculations revealed that both the ionic liquid and PEG have highly reversible hydrogen bonding interaction with H 2 S, which facilitates H 2 S permeation. Overall, this work proposes a novel and green method for preparing modified chitosan membranes targeting H 2 S separation, which may provide a new insight into the design of sustainable membrane materials for natural gas desulfurization.
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Shuyu Zhang,Yu Luo,Di Yu,Xianfeng Guan,Wanzhen Wu,Cuicui Li,Guangpeng Ma,Xinpu Zhou,Shuang Wang
Phosphoric acid (PA)-doped polybenzimidazole (PBI) is an ideal choice of membrane materials for high temperature proton exchange membrane fuel cells (HT-PEMFCs) as efficient clean energy devices. PA-doped PBI (PBI/PA) membranes exhibit favorable proton conductivity. However, extended usage results in the leaching of PA and the deterioration of mechanical qualities. Here, we prepared composite membranes of quaternised linear polymeric ionic liquid (PIL)/PBI containing side chains of quaternary ammonium (QA) and siloxane groups through a series of treatments. This design improves both proton conductivity and PA retention through the QA group, the conserved NH site and the high attraction of PIL to PA. Meanwhile, the introduced siloxane cross-linked structure ensures the mechanical properties and chemical stability of the membranes. Among them, QMPBI-P-O 10 -T 90 (P: PIL, O: TOPEA, T: TEA) membrane achieves a proton conductivity of 135.5 mS cm −1 at 180 °C and a PA retention of 85.3 % at 160 °C/0 % RH. In addition, at 160 °C without humidity, the peak power density of QMPBI-P-O 10 -T 90 membrane can reach 523.2 mW cm −2 . This synthesis strategy offers a promising new approach to fabricate polymeric ionic liquid-based crosslinked membranes for various applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
·
IF 2.1
Jimin Xu,Mengcheng Zuo,Junbo Tong,Xiangyang Liu,Maogang He
The addition of organic solvents has proven to be an effective strategy for enhancing the thermoelectric performance of ionic thermoelectric materials. However, systematic studies on how organic solvents influence the thermoelectric properties of ionic liquids remain limited. Based on molecular structure and polarity considerations, four ionic liquid + organic solvent systems─(1-ethyl-3-methylimidazolium dicyanamide ([EMIM][DCA])/1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) + Dimethyl sulfoxide (DMSO)/Propylene carbonate (PC))─were selected. A two-wire 3ω method was employed to measure thermal conductivity, along with a temperature gradient system for Seebeck coefficient measurements. The thermal conductivity, electrical conductivity, and Seebeck coefficient of the hybrid systems were investigated across various mass fractions and temperatures. The results indicate that selective solvation effects between ionic liquids and solvents can significantly enhance both electrical conductivity and Seebeck coefficient. At 25 °C, [EMIM][DCA] exhibited a 1.64-fold increase in the figure of merit with DMSO and a 0.90-fold increase with PC, while [EMIM][BF4] showed corresponding improvements of 1.62 and 0.92 times, respectively. Hybrid systems combining aprotic polar solvents with ionic liquids composed of asymmetric and highly polar ion pairs tend to exhibit superior thermoelectric performance.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yushu Xu,Yanru Chen,Xiaolei Guo,Shihao Wang,Yanyan Deng,Yuanji Li,Hua Wang,Teng Long,Xiao Cheng,Chuanjian Zhou
Conductive hydrogels are garnering increased attention for their application in flexible strain sensors due to their distinctive inherent excellent properties. However, the high water content leads to inadequate antifreezing capability, severely restricting their application in cold environments. Here, an interpenetrating dual-network hydrogel with intrinsic antifreezing property was prepared by introducing silicone-containing imidazolium ionic liquid [SiM]Cl into an acrylic acid gel system. The introduction of silicone composition increases the fracture strength of the hydrogel by 157% to 0.62 MPa. Notably, the existence of ionic liquid [SiM]Cl greatly enhances the hydrogel’s low-temperature resistance, offering it a freezing point as low as −42.9 °C and a breaking elongation of 650% even at −20 °C. The hydrogel has a conductivity of 2.46 mS/cm and shows excellent linear strain-sensing behavior. Flexible sensors fabricated using this hydrogel demonstrate sensitive and responsive performance to human movements, and the array sensors produced through three-dimensional printing technology can accurately reflect the distribution of force and deformation. Furthermore, the hydrogel exhibits favorable pH sensitivity and inhibits the growth of Escherichia coli and Staphylococcus aureus in more than 99%. The silicone ionic liquid-based multifunctional hydrogel in this work provides a noteworthy strategy for designing low-temperature-resistant flexible strain sensors.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Lihong Ding,Xiuliang Sun,Chongpin Huang,Jianwei Li,Biaohua Chen
Cumene oxidation is a key step in the industrial synthesis of phenol via cumyl hydroperoxide (CHP) formation. Ionic liquids (ILs) are attractive as green, metal-free alternatives catalysts for this reaction, but few studies have explored their potential. The study of the relationship between the structure and catalytic performance of ILs is crucial for the development of ionic liquids with excellent performance. In this study, we aimed to establish a theoretical protocol to evaluate the catalytic activity of ILs for cumene oxidation, as well as the structure–activity relationship, using density functional theory calculations. The calculations showed that the catalytic activity of the studied ILs decreased as follows: 1- n -butyl-3-methylimidazolium bromide > 1-butyl-1-methylpyrrolidinium bromide > N - n -butylpyridinium bromide > triethylammonium bromide > 1- n -butyl-2-methylpyrrolinium bromide. Moreover, the polarity, solubility, and maximum electrostatic potential of the ILs were linearly correlated with their catalytic activity. The theoretical predictions were verified by experiment. Additionally, DFT calculation and EPR analysis demonstrated that the catalytic activity of ionic liquids originates from the formation of hydrogen-abstracting radicals. Furthermore, using 1-butyl-1-methylpyrrolidinium bromide as a representative catalyst, we optimized the reaction conditions, a cumene conversion of 24.2 % and a CHP selectivity of > 90 % were obtained. Compared with the aqueous NaOH as a stabilizing agent, the reaction time is reduced by 8 h. This study provides new insights for designing efficient, low-cost, and environmentally friendly catalysts for cumene oxidation.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Ya-Fang Shang,Hui Chen,Zhi-Jing Ni,Kiran Thakur,Jian-Guo Zhang,Mohammad Rizwan Khan,Zhao-Jun Wei
This study explored the use of ionic liquid-ultrasound (ILU)-assisted extraction to enhance the extraction rate of Platycodon grandiflorum saponins (PGSs), and the content, extraction mechanism, antioxidant activity , whitening, and antiaging activity of PGSs prepared using ILU, ultrasound-water, thermal reflux-ethanol, and cellulase hydrolysis were compared. The ILU method particularly disrupted the cell wall, improved PGS extraction efficiency, and yielded a high total saponin content of 1.45 ± 0.02 mg/g. Five monomeric saponins were identified, with platycodin D being the most abundant at 1.357 mg/g. PGSs displayed excellent in vitro antioxidant activity and exhibited inhibitory effects on tyrosinase , elastase , and hyaluronidase . The results suggest that PGSs may have broad antioxidant, skin-whitening, and antiaging potential to a large extent. Overall, this study provided valuable insights into the extraction, identification, and bioactivities of PGSs, which could serve as a reference for future development and application of these compounds in the functional foods industry.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Li Guo,Wen-Xia Li,Yin-Bo Liu,Hai-Xin Du,Fei-Peng Du,Sheng-Gao Wang,Zhe Chen,Xiao-Ping Zeng,Ping Fu
To overcome the dual limitations of conventional moisture electricity generation (MEG) materials, including poor mechanical properties and limited electrical output, we developed a novel ionogel via UV-initiated copolymerization of 1-butyl-3-vinylimidazolium bromide (BVIm-Br) and acrylic acid (AA). The BVIm-Br/AA copolymer network, reinforced by extensive hydrogen bonding, imparts excellent mechanical properties, achieving a tensile strength of 44.76 MPa and a strain of 375.01%, while maintaining stability under cyclic strains up to 400%. Integrated into MEG devices, the ionogel delivers remarkable moisture-driven electrical performance under relative humidity (RH) 100%, producing an open-circuit voltage (VOC) of 922 mV, a short-circuit current (ISC) density of 165 μA·cm–2, and power density of 15.67 μW·cm–2. This work breaks through the performance bottleneck of MEG material design and establishes a new paradigm for next-generation environmental energy harvesters, with promising applications in ambient energy conversion and wearable electronics.
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Journal of CO2 Utilization
·
2024
·
IF 7.2
Xinjuan Li,Yan Liu,Ao Li,Xuening Ma,Xianbin Jia,Yahao Dong
Constructing stable nanochannels and nanoconfined environments for ionic liquids holds significant application value in gas separation, ion channels, and related fields. The functional polyionic liquid synthesized in this study exhibits a controllable assembly structure and demonstrates liquid crystal properties. Through heating and water treatment, the polyionic liquids crosslink to form multi-hierarchical nanopores, including sub-nanochannels with pore sizes similar to CO 2 , without the need for a catalyst. The specific surface area and pore size of the polyionic liquid network (PILC) were adjusted by regulating the self-assembly of polyionic liquids in water. The unique PILC, combining ionic liquid nanopores and liquid crystal structure properties, shows high CO 2 adsorption performance and excellent CO 2 /N 2 selectivities, surpassing commonly reported ionic liquid porous materials. Furthermore, PILC-2 exhibits good catalytic performance for CO 2 cycloaddition, and its catalytic activity and selectivity did not significantly decrease after five cycles. This study successfully introduces hierarchical ionic liquid nanochannels into porous networks without involving any inorganic ordered nanomaterials. This provides a simple and effective approach for the highly selective adsorption and separation of CO 2 , as well as for the preparation of catalytic materials.
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