JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Tao Zhang,Ao Li,Xin Xu,Yixin Ma,Dongmei Xu,Lianzheng Zhang,Jun Gao,Yinglong Wang
Acetone and n -heptane are widely applied in pharmaceutical industry as benign solvents and are observed in the wastewater. Because acetone and n -hexane can form an azeotropic mixture, it is impossible to recover acetone and n -heptane with high purity from the wastewater using conventional distillation. In this research, for separating the azeotrope (acetone + n -heptane) by homogeneous extractive distillation, 1-chlorobutane and butyl propanoate were chosen as the intermediate and heavy boiling entrainers. The isobaric vapour-liquid equilibrium (VLE) behaviour for the three binary systems (acetone + 1-chlorobutane), (butyl propanoate + acetone) and ( n -heptane + butyl propanoate) were reported at 101.3 kPa. The values of the excess Gibbs energy ( G E ) were calculated to explore the nonideal of the systems. The thermodynamic consistency of the determined VLE values was checked by the van Ness and Herington tests. In addition, the determined VLE data were fitted by the UNIQUAC, Wilson, and NRTL models. The parameters of those models were regressed, which are helpful for simulating the separation process with the intermediate and heavy boiling entrainers by extractive distillation.
研究领域:
化学工程
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热力学
·
分离过程
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2025
·
IF 12.5
Yujia liu,Lina Zhang,Qurat ul ain,Zhangfa Tong
Cellulose acetate (CA) has traditionally been synthesized through processes that require the activation of cellulose, the use of corrosive acid catalysts, and subsequent hydrolysis. These factors make the process complex, costly, and environmentally harmful. This study proposed a method for preparing cellulose acetate by coupling sodium acetate (a non-toxic metal salt) with 1-butyl-3-methylimidazole chloride (BmimCl) ionic liquid. Single-step synthesis of cellulose acetate with a degree of substitution (DS) ranging from 0.71 to 3.0 was achieved under varying reaction conditions. The experimental results demonstrated that adding sodium acetate significantly enhanced the acetylation efficiency of cellulose in an ionic liquid across a broad temperature range. In addition, the cellulose acetate film prepared by this method has 95 % transparency, a tensile strength of 64.5 ± 1.9 MPa, and a water vapor permeability of 34.48 ± 1.47 g/m 2 h −1 . These remarkable properties give the film significant potential to serve as a replacement for petroleum-based plastics. Overall, this study presents a novel and efficient strategy to boost cellulose acetylation in an ionic liquid, delivering a sustainable, cost-effective, and scalable solution for producing cellulose acetate with precise DS control in just one step.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Jinsheng Li,Wenjing Li,Xue Wang,Dong Pan,Rina Sa,Meiling Xiao,Changpeng Liu,Wei Xing,Jianbing Zhu
Anion exchange membrane water electrolyzers (AEMWEs) have undergone rapid development and are increasingly recognized as one of the most promising technologies for hydrogen production in alkaline environments. The advancement of this promising technology is hindered by several limitations associated with anion exchange membranes (AEMs), including inadequate conductivity and insufficient durability. To tackle these challenges during electrolyzer operation, this research presents an effective strategy to construct an ion cluster enriched membrane for high performance AEMWEs. Poly(terphenyl piperidinium), a state-of-the-art AEM, with robust ether-free backbone and alkali-resistant piperidinium functional groups, is adopted as the membrane matrix in this work. A novel DABCO based cationic polyelectrolyte is then synthesized and used as ion transport enhancer by constructing microscopic phase separation. The resultant membrane demonstrates exceptional performance, achieving a high ionic conductivity of 94.2 mS cm -1 and outstanding mechanical properties. A high-performance water electrolysis is achieved with 3185 mA cm -2 at 2 V at 80 o C, which was far from that of commercial FAA and PiperON membrane. Moreover, the water electrolyzer exhibited good in-situ stability at an industrial current density of 800 mA cm -2 for 1400 h, while maintaining a minimal voltage decay rate of 0.109 mV h -1 . This study provides an insightful design strategy for high-performance anion exchange membranes in AEMWEs.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Yujia Liu,Lina Zhang,Qurat ul Ain,Zhangfa Tong
Cellulose acetate (CA) is an important cellulose derivative with a wide range of applications. To adopt a more efficient and environmentally friendly method to synthesize cellulose acetate, a binary ionic liquid mixture of 1-butyl-3-methylimidazole chloride salt (BmimCl) and 1-butyl-3-methyldihydroimidazole phosphate (BmimH 2 PO 4 ) was used. Compared to the conventional methods, this approach didn't require pre-activation of cellulose and the process of homogeneous acetylation proceeded without a catalyst. By simply adjusting the reaction conditions, cellulose acetate with a degree of substitution (DS) in the range of 0.83–3.0 was produced by one-step homogeneous acetylation without hydrolysis. Furthermore, the cellulose acetate film produced by solvent casting exhibited smooth surface characteristics, 95 % transparency, and 57.9 MPa tensile strength. Therefore, this study highlights the importance of using binary ionic liquid mixtures for facile synthesis of cellulose acetate. Due to their excellent transparency and mechanical properties, newly synthesized cellulose acetate films could replace commercial films.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
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2024
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IF 2.4
Li Manli,Zhu Shengbin,Li Xiaohong,Jin Enqi
Graft polymerization-quaternization double modification has become a new effective method for preparing antibacterial chitosan (CS) in recent years. To improve the properties of double modified CS, the effects of molecular structures of amino-containing acrylate (ACA) monomer grafted onto CS (CS- g -PACA) and a quaternary ammonium reagent used for the quaternization of CS- g -PACA have been investigated in the study. A series of ACA monomers, i.e., dimethylaminoethyl methacrylate (DMAEMA), diethylaminoethyl methacrylate (DEAEMA) and 2-( tert -butyl amino)ethyl methacrylate (TBAEMA), were firstly grafted onto the molecular chain of CS. Then, CS- g -PACA was quaternized by various quaternary ammonium reagents, i.e., three kinds of chloralkane include 1-chlorobutane, 1-chlorooctane and 1-chlorododecane. The modified CS was blended with PVA to prepare nanofiber membranes by electrospinning. The major functional properties of the nanofiber membranes, e.g., fiber morphology, thermal stability, tensile property, water stability, and inhibition of E.coli and S.aureus as representatives of gram negative and positive bacterial, were evaluated systematically. The results showed that when ACA and chloralkane were TBAEMA and 1-chlorobutane, respectively, the graft-quaternization double modified CS/PVA blend nanofiber membrane possessed a more uniform and smooth fiber structure, higher thermal stability, tensile strength, water stability, and better inhibition function to the bacteria. For instance, the diameter of the fiber could reach ~ 180 nm and tensile strength of the fiber membrane could touch the value of 20.1 MPa as well. The inhibition rate of E.coli and S.aureus was as high as 95.9% and 99.6%, respectively. Double modified CS nanofibers have shown great potential to be used as biocompatible and environment-friendly medical and hygiene textiles. Graphical abstract
研究领域:
生物材料学
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高分子化学
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抗菌材料研究
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DOI
高影响因子
Molecular Catalysis
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2024
·
IF 3.9
Qingtao Niu,Aihua He,Chongdian Si,Guodong Liu,Bolin Dai,Manman Jin
Two TiCl 4 /MgCl 2 type Ziegler-Natta catalysts containing ethyl benzoate (EB) and dibutyl phthalate (DBP) as internal electron donors (ID) were prepared for isoprene polymerizations using five kinds of external electron donors (ED) (phenyltrimethoxysilane (ED-1), dicyclopentyl(dimethoxy)silane (ED-2), 2-butyl-2-ethyl-1,3-dimethoxypropane (ED-3), 1,3-dimethoxypropane (ED-4) and di(2-ethylhexyl)phthalate (ED-5)). The structure features of TiCl 4 /ID/MgCl 2 catalysts were characterized and the effect of ID and ED on polymerization behaviors was studied. EB had higher adsorption content on catalyst surface, higher catalytic activity and lower trans -1,4 stereoselectivity than DBP . Appropriate introduction of ED-1 and ED-2, expect ED-3, ED-4 and ED-5, caused the enhancement in polymerization activity and trans -1,4 content, while excess addition led to the deactivation. The effect of ED on equilibrium between selective activation and deactivation of active species significantly relied on the electron donor type and concentration.
研究领域:
高分子化学
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催化
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材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Zhiqiang Gao,Li Ding,Hongying Lv,Yaheng Zhang,Yalin Yu,Shi Cheng,Yukai Zong,Dongdong Ge,Shouqiang Huang
The detrimental effects of chloride (Cl − ) ions on industrial wastewater necessitate the in-situ monitoring of Cl − , which is challenging due to the limited availability of field-applicable analytical methodologies. Herein, a novel and compact apparatus (CPB-FC-Cl) was developed for the precise quantification of Cl − in wastewater. This innovative system utilizes the rapid halide exchange of cesium lead bromide (CsPbBr 3 ) perovskite nanocrystals (NCs) with Cl − , a process marked by a pronounced wavelength blueshift and a vivid fluorescence transition from green to blue. The software in the CPB-FC-Cl system automatically identified the fluorescence emission peaks and displayed the Cl − concentration values on the user interface. The detection experiments conducted on actual hydrochloric acid wastewater confirmed the device’s ability to accurately measure Cl − concentrations within 5 min, achieving an accuracy of 98.98 %. The CPB-FC-Cl system exhibited high selectivity in the presence of various coexisting substances in hydrochloric acid wastewater, and its resistance to potential interferences supports its suitability for precise Cl − quantification. The stability of the CPB-FC-Cl system showed an average detection accuracy of 98.96 % over multiple cycles, which underscores its robustness for long-term monitoring applications.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2025
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IF 4.3
Ruyu Bai,Haibo Jiang,Minxin Wang,Geyuan Jiang,Gaojin Lyu,Dawei Zhao
Ionogels consist of polymers and ions have emerged as promising application in flexible electronic devices. However, challenges remain in achieving the mechanical properties and low-temperature tolerance of ionogels. Here, a cellulose ionogel is reported by triggering the mechano-induced alignment of cellulose molecular chains and incorporating Ca 2+ complexation interactions. This cellulose ionogel presents outstanding mechanical properties and ionic conductivity, featuring a tensile strength of 6.84 MPa, an elastic modulus surpassing 100 MPa, and an ionic conductivity of 31.7 mS·cm −1 . Furthermore, the Ca 2+ complexation networks provide the cellulose ionogel with remarkable freezing resistance, allowing it to maintain flexibility even at temperatures as low as −196 °C, while the assembled electronic skin displays reliable sensing performance. The combination of robust mechanical strength, high ionic conductivity, biocompatibility, and extreme temperature tolerance underscores the potential applications of this cellulose ionogel, ensuring the stable operation of flexible electronic devices in highly challenging environments.
研究领域:
材料科学
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柔性电子
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生物医学工程
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Wei Zheng,Haiyan Jiang,Chaoran Wang,Shaojuan Zeng,Xiaochun Zhang,Haifeng Dong,Lu Bai,Xiangping Zhang
Carbon dioxide (CO2) separation plays a vital role in environmental protection and resource reuse. A potential approach to achieving satisfactory CO2 separation is combining the benefits of ionic liquids (ILs) and membranes. In this work, the IL-LDH nanosheets were obtained by functionalized IL modifying layered double hydroxides (LDH) and used to construct the Pebax/IL-LDH mixed matrix membranes (MMMs). The X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) spectra analysis displayed that the IL was successfully grafted to the LDH nanosheets. The characterizations of MMMs showed that the introduction of IL-LDH reduces the crystallinity of the Pebax membrane, and there are hydrogen bond interactions between fillers and Pebax. The IL modification strengthens the membranes with better CO2 affinity and improves the interfacial compatibility between Pebax and LDH. Meanwhile, the CO2-philic nanochannels formed by the slits of IL-LDH nanosheets facilitate CO2 transport in MMMs. Such inherent properties of the IL and LDH conjunctly contribute to the improvement of the CO2 separation performance of membranes. The optimum Pebax/IL(20)-LDH MMM has a high CO2 permeability of ∼388 barrer at 30 °C, which is approximately 2.9 times that of pure Pebax, and the CO2/CH4 selectivity does not change significantly. Besides, the Pebax/IL(20)-LDH MMM exhibited a notable increase in CO2 permeability as the working temperature increased, ultimately attaining ∼576 barrer at 50 °C.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shengxin Chen,Bin He,Yingwei Li,Ruirui Wang,Ping Chen,Xingang Li,Ruixia Liu
The selective oxidation of cyclohexane to cyclohexanone and cyclohexanol (KA oils) without additional initiator remains a challenge because of its inherent low activity and limited selectivity. To promote the selectivity of KA oils at high reaction conversion, a series of novel cobalt-based poly(ionic liquid)s (Co-PILs) catalysts were designed. The electronic structure and the microenvironment of Co sites in Co-PILs were regulated by tuning the contents of Co. By the regulation of the microenvironment, the cyclohexane conversion and KA oils selectivity are improved by 19% and 47% (Co-PIL-1–2.5) compared with traditional metal salt catalysts, respectively. Mechanistic studies demonstrated that the electronic structure and coordination environment of transition metals can be effectively tailored. Notably, Co-PILs with low metal loading exhibit a remarkable ability to improve the reaction by transitioning from a low-spin to a high-spin state. Moreover, by adjusting the ratio of cobalt ions to ionic liquid monomers derived from PILs, the acidity, oxygen activation, and desorption of reactive oxygen species were also regulated accordingly. These properties play a pivotal role in the oxidation process, ultimately allowing for precise control over the activity and selectivity.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Qingtao Niu,Aihua He,Chongdian Si,Guodong Liu,Mingxuan Xiao,Guifan Chen,Manman Jin
Four TiCl 4 /MgCl 2 Ziegler-Natta catalysts (Cat-1∼Cat-4) with titanium contents in the range of 0.038–0.578 wt% were synthesized by the chemical rout and used for isoprene polymerizations. Four catalysts had similar possessed rod-like morphologies and their surface areas gradually increased as Ti contents increased. Cat-1 with the lowest Ti content (0.038 wt%) had the highest catalytic activity (28039.6 g∙P/(g∙Ti∙h)). To our knowledge, this was the highest activity achieved for isoprene polymerization using the heterogeneous TiCl 4 /MgCl 2 Ziegler-Natta catalyst. With the increasing Ti content, the catalyst activity gradually decreased in the order of Cat-1 < Cat-2 < Cat-3 < Cat-4, whereas the trans -1,4 stereoselectivity increased. Cat-4 with the highest Ti content (0.578 wt %) gave highest trans -1,4 units (97.7 mol%). The polymers were mainly composed of fraction C, D and G. C and D had high trans -1,4 structure while G fraction had low trans -1,4 structure. The plausible stereospecific transformation models of MgCl 2 -supported Ziegler-Natta catalyst with different Ti contents were discussed.
研究领域:
催化
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高分子化学
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材料科学
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DOI
高影响因子
Separations
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2026
·Vol. 13
·期 2
·72
·
IF 3.5
Mengshuai Liu,Xiaoman Li,Mengmeng Zhao,Xuyang Jiu,Chuang Yao,Minglei Tian
Background: Food waste contains abundant (+)-catechin, but its efficient recovery remains challenging. This study aimed to prepare ionic liquid (IL)-modified sorbents and establish an efficient method for (+)-catechin recovery from chocolate waste via solid-phase extraction (SPE). Methods: Three series of IL-modified sorbents (Sil-IL, ZIF67-IL, Sil@ZIF67-IL) were synthesized. Their adsorption performance was evaluated under different conditions; adsorption isotherm and kinetic data were fitted to Langmuir/Freundlich and pseudo-first/second-order models, respectively. Sorbent stability and (+)-catechin recovery from chocolate waste extracts were tested. Results: Sil@ZIF67-Hmim showed the highest adsorption capacity (154.4 mg/g) at 25 °C within 120 min. Adsorption followed the Langmuir model (R2= 0.99), indicating chemisorption. Sil@ZIF67-Hmim was subjected to repeated solid-phase extraction (SPE) for five consecutive days; the recovery rate ranged from 98.1% to 99.2%, and the relative standard deviation (RSD) was 3.2–4.4%. Conclusions: Sil@ZIF67-Hmim is a high-efficiency sorbent for (+)-catechin recovery from chocolate waste, providing a novel approach for food waste valorization and highlighting the application potential of IL-modified MOF-silica composites.
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高影响因子
危险品化学品经营许可证（带存储）