CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Jinrui Jiang,Yuzhang Wu,Jiaming Luo,Wei Qu
Wood, a ubiquitous material in furniture and construction, is limited by its natural flammability. Existing wood flame retardant technologies are often ineffective and lack environmental sustainability. Ionic liquids (ILs), known for their non-flammability and non-volatility, offer a green solvent solution to these challenges. In this study, we synthesized a novel phosphorus-containing, polymerizable IL. The IL was impregnated into the wood and polymerized in situ, yielding PIL-modified wood (PIL-wood). Raman spectroscopy and SEM confirmed the IL's in-situ polymerization in the wood and its effect on swelling the cell walls. Notably, wood treated with 30 % PIL (IL30W) showed a 74.2 % decrease in total heat release (THR) compared to untreated wood (UW). The condensed-phase flame retardant mechanism analysis reveals that PIL-wood expands during heating, transitioning into wood foam with a linear expansion growth rate of up to 84 %. This macroscopically manifests as an increase in wood pores, improving thermal and oxygen insulation, and thus enhancing flame retardancy. This represents a plastification intumescent flame-retardant mechanism, and the observed changes in PIL-wood upon heating could offer new insights for developing novel wood-based functional materials.
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高影响因子
Results in Surfaces and Interfaces
·
2025
·
IF 4.4
Zijing Bai,Yumeng Wang,Wei Shi,Peng Gao,Zengyun Jian
Protic ionic liquids (PILs) have been emphasized in recent years owing to their convenient synthesis routines and outstanding lubricity properties. In this work, amidoxime-based PILs were investigated as additives in PAO10. The tribological tests demonstrated that these newly synthesized PILs could highly improve the friction-reducing, anti-wear, variable-frequency and load-carrying capacity properties of PAO10. The results of contact angle, ECR, SEM-EDS and XPS analysis revealed that the tribofilm consisted of a physical absorption layer containing organic carbonaceous species and a tribochemical film containing Fe 2 O 3 , which is responsible for the significant improvement of tribological performances of PAO10.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2025
·
IF 3.9
Megawati Zunita,Budiman Batara,Graecia Lugito,I. Gede Wenten,Katja Loos,Sun Theo Constan Lotebulo Ndruru
Ionic liquids (ILs) have emerged as promising materials in various sectors, particularly for enhancing membrane separation and antibacterial performance in water and wastewater treatment applications. This study investigates the antibacterial effects of ethyl methylimidazolium ([EMIM] + )-based IL anions on forward osmosis (FO) membranes. Imidazolium-based IL cations were synthesized using a microwave method and grafted onto a thin-film composite (TFC) membrane to improve bacterial inhibition and separation performance. A novel approach utilizing ultrasound methods was employed to integrate polyamide (PA) and ILs onto the polysulfone (Psf) membrane surface. Among the tested ILs, [EMIM][NTf 2 ] demonstrated the highest antibacterial activity against Escherichia coli , as evidenced by agar disk diffusion and total plate count (TPC) measurements. The Psf-PA-[EMIM][NTf 2 ] membrane significantly outperformed other membranes in antibacterial activity and exhibited excellent FO membrane performance. The results indicate that incorporating ILs into FO membranes enhances hydrophilicity and antibacterial properties, making them highly suitable for water and wastewater treatment. This study provides valuable insights into developing dual-functional membranes with improved antibacterial and separation performance, contributing to more effective and sustainable treatment technologies.
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GREEN CHEMISTRY
·
2025
·
IF 9.2
Kaihao Mo,Peng Cui,Dongni Liu,Cailan Chen,Hanyu Zhang,Minmeng Tang,Peiwen Wu,Yan Huang,Haiyan Ji,Wenshuai Zhu
In extraction processes, the low mass transfer efficiency of conventional ionic liquids is a refractory problem. Herein, a porous ionic liquid (PIL), β-CD-900-PIL, was innovatively constructed by combining a porous carbon material (β-CD-900) derived from β-cyclodextrin polymer with imidazole bis-trifluoromethylsulfonylimide ionic liquid ([C12mim][NTf2]). The N2 sorption isotherm and CO2 adsorption confirmed the porosity of β-CD-900 and the PIL. With the dispersion amount of β-CD-900 as 20 wt%, the extraction efficiency of naphthalene by β-CD-900-PIL reached 66.6%, which was 24% higher than that of the ionic liquid. After three extractions, the naphthalene content decreased from 500 mg L−1 to 5 mg L−1. The high extraction efficiency was attributed to the high porosity and abundant π–π and C–H⋯π interactions between PILs and naphthalene. The more than 99% extraction performance, low viscosity and low preparation cost make β-CD-900-PIL an ideal extractant for polycyclic aromatic hydrocarbons in the petrochemical industry.
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World Journal of Engineering
·
2020
·Vol. 17
·期 1
·21-26
·
IF 0
Leqin He,Shenjun Qin,Jianjun Liu,Wei Zhao,Tao Chang
PurposeFrom the atom economy and environmentally friendly point of views, the development of clean and green approaches using ionic liquids (ILs) as recyclable catalysts has attracted increasing attention. The purpose of this study is to investigate the effect of task-specific ILs content on the one-pot three-component Biginelli reaction.Design/methodology/approachA series of halogen-free quaternary ammonium ILs functionalized with –SO3H group were prepared and characterized by1H nuclear magnetic resonance (NMR),13C NMR and electrospray ionization mass spectrometry. The ILs were used as catalysts for Biginelli reaction among aromatic aldehydes, urea or thiourea and β-dicarbonyl compounds. Anions and cations of ILs were varied to observe their effects on and contributions to the catalysts. The influencing factors, such as the amount of catalyst, solvent, reaction time and reaction temperature, were investigated.FindingsThe effect and contribution of cations of ILs were observed. Results showed that 3-(N, N-dimethylhexadecylammonium) propanesulfonic acid toluene sulfate ([DHPA][Tos]) showed comparable catalytic activity. Good adaptability to the reaction substrate and maximum product yield was observed when [DHPA][Tos] was used as catalyst. It was found that Biginelli reaction catalyzed by 10 mol% [DHPA][Tos] for 3 h under solvent-free conditions at 80 °C gave the best yield of 94%. Post-processing steps were simple, and the catalyst could be reused easily.Originality/valueThis paper demonstrates that ILs containing a long carbon chain and a bulky Tos anion efficiently promoted the reaction, in which the long carbon chains facilitate mass transfer in the reaction system.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Huang Huang,Junxiao Li,Haibo Ke,Yangjian Du,Wenlian Peng,Mengyan Dai,Yufeng Zhang,Xue-ao Zhang
Multilayer graphene has been employed as a functional material for tuning the emissivity in mid- and long-infrared range, which shows great potential for various applications, such as radiative cooling and thermal camouflage. However, the stability of the multilayer graphene is not sufficient for practical applications yet. Even though it is reported that the integrity of the multilayer graphene is compromised by ion intercalation, the detailed mechanism is rather unclear. Here, a set of ionic liquids is deployed as sources of electronic charges for tuning the emissivity of multilayer graphene. It is found that the emissivity modulator using 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([EMIm]NTf2) as the ionic liquid provides a modulation depth of about 0.52 (i.e., about 21% larger than the best-reported value) while maintaining a reasonable device lifetime. The microscopic structures of the multilayer graphene in an operational and failure modulator are investigated by scanning electron microscopy, Raman spectroscopy, X-ray diffraction. The results indicate that the modulation depth of emissivity is negatively correlated with the initial voltage, which represents the reaction potential between the ionic liquid and graphene. Furthermore, not only the chemical reactivity but also the size of both anion and cation in the ionic liquids play important roles in maintaining stability of the modulator. Therefore, a set of criteria (e.g., low initial voltage and small size of anion and cation) is proposed to select proper ionic liquids for emissivity modulation. This not only sheds light on the underlying physics of the modulator but also promotes its practical applications.
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HYDROMETALLURGY
·
2019
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IF 3.465
Deliang Luo,Nengwu Zhu,Yao Li,Jiaying Cui,Pingxiao Wu,Jieyuan Wang
The fragile indium supply inspired the development of recycling programs for end-of-life electronics products, especially liquid crystal displays (LCDs). LCDs consume 70% of the total indium resources used in the world today. In this study, a novel fusion of leaching and extraction processes was proposed to recycle indium from waste LCDs using the functionalized ionic liquid betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf 2 N]). Under the optimum conditions of 10 mL 50% (v/v) ionic liquid/ascorbic acid, 20 g/L of solid/liquid ratio, and 90 °C operation temperature within 24 h, the indium leaching rate could reach as high as 99.75% and the indium extraction rate could be enriched by 98.63% in the ionic liquid phase after cooling and stratifying. Introducing ascorbic acid into the process in place of deionized water decreased the distribution rate of iron from 59.87% to 8.84% and promoted the separation of indium and iron. Indium in the ionic liquid phase could then be transferred into an indium-rich solution using oxalic acid and retrieve the ionic liquid. The characteristics of the regenerated ionic liquid remained relatively stable for reutilization. Therefore, the proposed fusion of leaching and extraction processes by [Hbet][Tf 2 N] provides an efficient alternative to recycle indium from waste LCDs.
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APPLIED CATALYSIS A-GENERAL
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2018
·
IF 4.521
Xuan Zhang,Rui Zhang,Xianghai Meng,Haiyan Liu,Zhichang Liu,Hao Ma,Chunming Xu,Peter A.A. Klusener
The deactivation mechanism and the activity recovery approach of composite ionic liquid (CIL), a kind of acidic chloroaluminate ionic liquids (ILs) modified with CuCl for the in 2013 successfully commercialized catalysis of isobutane alkylation are being discussed in this paper. CIL showed catalytic activity only in the presence of both Brønsted and Lewis acids. CIL deactivation was caused by the loss of Brønsted acidity and/or Lewis acidity. Brønsted acidity decreased by the loss of trace amount of formed chlorohydrocarbons with the outflowing alkylate. Lewis acidity was deactivated mainly due to the complexation of the formed acid soluble oil (ASO) with the CIL anions. Brønsted acidity was maintained by the continuous addition of hydrogen chloride (HCl) or tert -butyl chloride, and Lewis activity was recovered by AlCl 3 addition. However, Brønsted acidity could not be recovered when Lewis acidity was lost and was thus dependent on Lewis acidity. Furthermore, ASO interacted with active components of CIL, causing the loss of copper via precipitation of CuCl which is the major contributor to the high selectivity. Therefore, CuCl was added simultaneously with AlCl 3 to maintain the high selectivity of alkylate.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 38
·13276-13285
·
IF 7.393
Zhaohui Huang,Mengjiao Yi,Yue Xu,Ping Qi,Yihan Liu,Aixin Song,Jingcheng Hao
Organic manganese(II) halides have become attractive building blocks for constructing luminescent functional materials due to their excellent optical properties. Here we presented three magnetic fluorescent ionic liquids (ILs) with [MnClxBry]n− (x = 2, y = n = 1 or x = y = n = 2) complexes as luminophores and 1-vinyl-3-butylimidazolium ([C4VIM]+), 1-octyl-3-vinylimidazolium ([C8VIM]+) and 3-dodecyl-1-vinylimidazolium ([C12VIM]+) as organic cations. The three ILs showed green, red and yellow emissions, respectively, with the increasing alkyl chain length at room temperature. All ILs experienced a phase transition from the crystal to the liquid crystal (LC) phase during the heating process, accompanied by the emission color change from green or yellow to red, which was ascribed to the structural transition from the tetrahedral complex [MnCl2Br2]2− to the octahedral species [MnCl2Br]−. Such a thermochromic response was fast, reversible and stable, and more importantly, rarely reported for Mn-based luminescent substances. Furthermore, the emission intensity of the ILs was sensitive to water and some organic vapors. Fluorescent papers loaded with these ILs were prepared in a facile way, and were conveniently used as temperature indicators and organic vapor sensors. This work proposed a simple strategy to prepare luminescent ILs with controlled structures and optical properties, providing more opportunities for the application of IL-based smart materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinli Qin,Zhaolu Wang,Jie Hu,Yuan Yuan,Ping Liu,Li Cheng,Zhengqing Kong,Ke Liu,Shouke Yan,Jianming Zhang
Rod-like cellulose nanocrystals (CNCs) show the intriguing liquid crystal self-assembly ability. The understanding of the self-assembly behavior of CNCs is of fundamental importance for constructing cellulose-based functional materials . The presented work explores how the liquid crystal self-assembly behavior of CNCs is affected by the grafted ionic liquids (IL) [VBIm][BF 4 ]. The results demonstrate that the IL modified CNC (CNC-IL) with positive charged form chiral nematic structure in suspensions, which was normally observed in negative charged ones. Significantly, such liquid-crystalline organization can be obtained under much lower concentration (as low as 1.0 wt%) than that of the non-functionalized CNCs prepared from paper pulp (~ 3.0 wt%). Moreover, for CNC-IL concentrations varying from 1.0 to 4.0 wt%, the tactoids (showing obvious fingerprint texture) coexist with the disordered CNC phase, rather than separating into two phases. Unlike original CNCs, the pitch of chiral nematic tactoids increases with increasing concentration of CNC-IL. Our study suggests that the distinct liquid crystal self-assembly behavior of CNC-IL is related to the restricted mobility of CNCs rods due to the increase in CNCs particle size and the high viscosity of CNC-IL suspension as the result of IL surface modification. The study of the liquid crystal assembly behavior of IL modified CNCs provides some new insight to understand the intriguing chiral nematic self-assembly of CNCs and for construction of CNC-IL reinforced nanocomposites .
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Tao Jin,Haoxuan Shen,Su Ma,Zhouyu Yao,Fang Feng,Yingyuan Hu,Ming Gao,Xuedong Wang
Nonylphenol (NP) is a common pollutant with high biotoxicity in industrial waste waters, such as printing and dyeing, cleaning, preparation of surfactant and detergents, etc., and can disrupt the endocrine and reproductive system. Therefore, its emission is imperative to be monitored. To achieve the specific detection of NP, we herein synthesized a novel fluorescent ionic liquid (NAIm) bearing a double naphthalene ring. The fluorescent intensity of NAIm was significantly quenched upon the addition of NP, and the underlying quenching mechanism belonged to a static quenching mode. DFT theoretical calculations suggested that the band gap increased by 0.11 eV, where the ground state electrons were transferred from the HOMO orbitals of NP to the LUMO ones of NAIm. The specific detection of NP by NAIm was demonstrated to be feasible. NAIm was also able to identify and quantify NP in ambient samples, and the fortified recoveries for NP was in the range 89–110 %. The newly developed fluorescent ionic liquid holds great promise in specific detection of NP in environmental waters.
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JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Yongliang Xu,Yuanwei Huang,Lanyun Wang,Kun Zhang,Yao Li,Haidong Chen
The kinetic formation of CH 4 hydrates formation was investigated in the presence of [P 2444 ][PF 6 ], [P 4444 ][PF 6 ], [P 6444 ][PF 6 ], [P 4444 ]Br, [P 6444 ]Br and [P 12444 ]Br with concentrations of 0.25 wt%, 6.25 wt%, 10 wt% under the pressure of 4.0 and 5.0 MPa. The results show that [P 2444 ][PF 6 ], [P 4444 ][PF 6 ] and [P 6444 ][PF 6 ] increase the nucleation temperatures and shorten the induction time, where [P 4444 ][PF 6 ] improves the gas consumption and consumption rates of CH 4 hydrates. At the same time, [P 4444 ]Br, [P 6444 ]Br, and [P 12444 ]Br are unfavorable for increasing the nucleation temperature and shortening the induction time. This implies that [PF 6 ] − anion is more favorable for rapid nucleation than the Br − anion. However, in the presence of [P 4444 ]Br, [P 6444 ]Br and [P 12444 ]Br, the gas consumption was clearly enhanced, following an order of [P 12444 ]Br > [P 6444 ]Br > [P 4444 ]Br, indicating the superiority of long alkyl chains. The dissociation behaviors of CH 4 hydrates were also measured and the pre-dissociation time, dissociation temperature, and fast dissociation time were analyzed. It is found that [P 4444 ][PF 6 ] significantly enhanced the thermal stability of CH 4 hydrate due to a longer pre-dissociation time and a higher dissociation temperature. In contrast, ionic liquids with Br − anion exhibited the opposite effect. Despite having a greater ability to reabsorb CH 4 gas during the self-protection, [P 6444 ]Br and [P 12444 ]Br exhibit faster hydrate dissociation with larger gas-releasing amount compared to the symmetric [P 4444 ]Br and [P 4444 ][PF 6 ]. In general, [P 4444 ][PF 6 ] offers more advantages from the standpoint of safety regarding the storage and transportation of CH 4 hydrate.
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危险品化学品经营许可证（带存储）