JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
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IF 2.726
Dong Fu,Xue Feng,Pan Zhang
Amino acid ionic liquids (AAILs) including 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium L -lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) were used to enhance the absorption of CO 2 in N -methyldiethanolamine (MDEA) aqueous solutions. The mole fractions of CO 2 in N 2 + CO 2 gas mixtures ranged from 0.2 to 1.0. The mass fractions of MDEA and AAILs respectively ranged from 0.300 to 0.400 and 0.050 to 0.100. The absorption capacity and absorption rate under series of conditions were presented and the influences of CO 2 partial pressure and the types of AAILs on the absorption performance were demonstrated.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yan-Mei Zhang,Wen-Wen Xie,Xiao-Xue Hu,Xin-Ru Chen,Heng Mao,Li-Hao Xu,Xin-Yu Shi,Tao Wang,Ying-Nan Feng,Zhi-Ping Zhao
Bioethanol has garnered widespread attention as a potential substitute for traditional fossil fuels. Focusing on the treatment of bioethanol fermentation exhaust is crucial for optimizing bioethanol recovery and achieving carbon dioxide (CO 2 ) purification. This study successfully achieved the large-scale synthesis of zeolitic imidazolate framework-8 (LSZIF-8), which was then incorporated into polydimethylsiloxane (PDMS) to fabricate large-area ZIF-8/PDMS/PVDF mixed matrix membranes (MMMs) for bioethanol recovery from fermentation exhaust via vapor permeation (VP) processes. The ZIF-8/PDMS/PVDF MMMs exhibited a 1.5-time increase in ethanol permeability and selectivity improved by 1.7 times compared to the PDMS/PVDF membrane. The mass transport behavior of ethanol and CO 2 molecules within the membrane, as well as examining the interactions between different components was systematically explored. It delves into the disparities in separation performance between PDMS/PVDF membrane and ZIF-8/PDMS/PVDF MMMs with nitrogen (N 2 ), water vapor as the third component. Notably, high-quality LSZIF-8 crystals serves as a crucial source of raw materials for the continuous preparation of high-performance MMMs, addressing the limitation of traditional nanoparticle fillers in terms of scalability for production. This study paving new avenues for purifying fermentation exhaust and recovering bioethanol, while simultaneously present significant potential for industrial applications.
研究领域:
材料科学
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环境科学
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生物能源
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RSC Advances
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2017
·Vol. 7
·期 47
·29742-29751
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IF 3.108
Maodong Xu,Wanqing Zhang,Xiaomei Pei,Jianzhong Jiang,Zhenggang Cui,Bernard P. Binks
Stable n-decane-in-water Pickering emulsions were prepared using positively charged alumina nanoparticles in combination with a trace amount of the anionic surfactant sodium dodecyl sulfate (SDS) as a stabilizer. Particles were hydrophobized in situ by adsorption of surfactant enhancing their surface activity. Emulsions can be readily demulsified by addition of an equal amount of a switchable surfactant, N′-dodecyl-N,N-dimethylacetamidine (DDAA), which can be transformed between a surface-active amidinium/cationic form and a surface-inactive amidine/neutral form by bubbling CO2 or N2, respectively. Following addition of cationic DDAA which prefers to form ion pairs with SDS, desorption of SDS from particle surfaces occurs and alumina particles are rendered hydrophilic resulting in demulsification of the emulsion. However, by bubbling N2 into the demulsified mixture, DDAA molecules are converted to the amidine/neutral form leading to collapse of the ion pairs and re-establishment of the in situ hydrophobization of particles. Stable Pickering emulsions can be prepared again following homogenization. This simple demulsification/re-stabilization cycle can be repeated several times. Experimental evidence including measurement of the adsorption isotherm, zeta potentials, extent of particle adsorption at droplet interfaces in emulsions and microscopy is given to support the postulated mechanisms.
研究领域:
化学工程
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材料科学
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界面科学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Xiaomei Pei,Junhui Wu,Xinyuan Zou,Binglei Song,Zhao Chen,Pei Liu,Zhenggang Cui,Ting Pan,Yao Gu
Stimulus-responsive surfactants (N + –C n -N,n = 14 or 16) can stabilize conventional emulsions, Pickering emulsions and oil-in-dispersion emulsions in the presence of oppositely and similarly charged nanoparticles. Rapid demulsification can be successfully achieved by bubbling CO 2 . In the presence of CO 2 , N + –C n -N becomes a hydrophilic Bola-type surfactant, N + –C n -NH + , and is an inferior emulsifier either when used alone or together with charged nanoparticles, resulting in demulsification. In addition, nearly all N + –C n -NH + molecules are present in the aqueous phase after demulsification without contaminating the oil phase. The aqueous phase can be recycled and used again for further emulsification of oils. Compared with the pH responsive systems, there is no accumulation of salt after the gas cycles, and more cycles can be performed. This protocol is a green process and leads to preparation of various temporarily stable emulsions used in oil emulsion transportation, emulsion polymerization, industrial catalysis, nanomaterial synthesis and other fields.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Rui Ding,Wenji Zheng,Kai Yang,Yan Dai,Xuehua Ruan,Xiaoming Yan,Gaohong He
High permeability and selectivity are desirable for mixed matrix membranes (MMMs) based CO 2 separation. Herein, a microemulsion based mixed linker strategy is proposed to introduce amino groups during the growth of ZIF-8. Compared to post-synthetic modification, this method presents a less reduction in S BET of ZIF-8, which is beneficial for CO 2 adsorption. By controlling the ratio of 2-methylimidazole to 2-aminobenzimidazole, NH 2 -ZIF-8 with various morphologies and sizes were synthesized and serve as the filler to fabricate the MMMs for CO 2 capture. From the scanning electron microscopy (SEM), no obvious agglomerations or defects are observed in ZIF-8/Pebax MMMs, due to the amino groups in ZIF-8 can interact with the amide in Pebax chain, which can improve compatibility between ZIF-8 and Pebax. With the amino groups, NH 2 -ZIF-8 shows higher affinity with CO 2 than that of non-amine-functionalized ZIF-8, leading to an enhancement in the separation performances. When the MMM doped with 6 wt% of NH 2 -ZIF-8(10), the CO 2 permeability reaches up to 163.8 Barrer, which increases by around 53% and 107.6% in contrast with the ZIF-8/Pebax MMM and pure Pebax membrane. Besides, the CO 2 /N 2 selectivity is enhanced by around 10% and 27%, respectively. These results indicate that amine-functional modification by mixed ligands is a useful way to construct MOFs-based MMMs with high performance for CO 2 /N 2 separation.
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FUEL
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2024
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IF 6.7
Xin-Yue Wang,Yi-Ming Gu,Xu-Peng Zong,Sheng-Sheng Zhao,Shu-Dong Wang
The inevitable combustion of fossil fuels in human industrial activities results in significant greenhouse gas emissions, leading to the pressing challenge of CO 2 /N 2 separation in humid flue gas. Iron-based Metal-organic frameworks (MOFs) have proven to be cheap, robust against water vapor attack due to the enhanced coordination bonds. In this study, we present two distinct MOFs i.e., DNL-9(Fe) and PCN-233(FeM II ), constructed by Fe clusters and 2,5-furandicarboxylic acid ligands. Static adsorption experiments revealed that DNL-9(Fe), featuring an exclusive Fe-F-Fe spiral packing structure, exhibited higher surface areas and enhanced CO 2 adsorption performance that outcompeted PCN-233 candidates. DNL-9(Fe) demonstrated a high IAST selectivity of CO 2 /N 2 at 247 (15/85, v/v, P/P 0 = 0.01), superior to the most of state-of-the-art Fe-MOFs reported up to date. The further theoretical calculations elucidated the binding sites of the framework with CO 2 molecules. Importantly, DNL-9(Fe) showed sufficient water stability and cyclic separation, as confirmed by dynamic breakthrough tests, indicating it as a promising candidate for practical CO 2 capture from humid flue gas.
研究领域:
化学
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材料科学
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环境科学
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高影响因子
HIGH PERFORMANCE POLYMERS
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2025
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IF 1.6
Zhiqing Liang,Zhongying Liu,Xiuyuan Wei,Hui Wu,Chanjuan Liu,Xiaohua Huang
Bifunctionalized NH2-UiO-66-CF3 nanofillers were successfully prepared by grafting - CF3 on NH2-UiO-66 via aldehyde-amine condensation reaction and applied to the preparation of 6FDA-ODA/NH2-UiO-66-CF3 mixed matrix membranes (MMMs). The successful introduction of -NH2 and -CF3 groups was verified by FT-IR, XRD, and XPS characterization, and the integrity of the crystal structure was ensured. Due to the presence of hydrogen bonding, NH2-UiO-66-CF3 showed good interfacial compatibility with the polymer matrix. Due to the introduction of the - CF3 group, the MMMs exhibited excellent thermal stability (T10% > 500°C, Tg = 300°C–305°C), hydrophobicity (contact angle of 92.96–97.71), and mechanical properties (tensile strength of 74–85 MPa). The gas separation performance tests showed that the MMMs exhibited significantly improved gas permeability and selectivity compared to the pure 6FDA-ODA membranes, which was attributed to the fact that the -NH2 and -CF3 groups provided more adsorption sites for gases. In particular, the PI/NUF(10) MMMs showed the best performance, with permeabilities of 42.71, 9.22, and 92.79 Barrer for CO2, O2, and He, respectively, which were 248%, 213%, and 173% higher than those of the pure membranes. Meanwhile, the selectivities of CO2/N2, O2/N2 and He/N2 were improved by 37%, 24%, and 8%, respectively. Close to the Robeson upper limit, demonstrating excellent gas separation potential.
研究领域:
材料科学
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化学工程
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膜技术
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气体分离
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纳米技术
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 8.8
Shumin Li,Wenjun Su,Zeyang Di,Suyue Zhong,Junjie Ma,Jian Li
Membrane separation has emerged as a competitive energy-efficient approach for carbon capture and flue gas treatment. Membrane materials and structures are the core of gas separation membranes, which collectively govern gas molecular mass transfer and separation behaviors. Two-dimensional (2D) graphene oxide (GO) porous nanosheets hold great promise for gas separation due to their nanoscale thickness and structural tunability, but they are often limited by low permeability. Herein, we propose a supramolecular strategy to fabricate ZIF-L/GO/Pebax mixed matrix membranes with intercalated network architectures for efficient CO 2 /N 2 separation. Leaf-like ZIF-L expands the interlayer spacing of GO nanosheets and constructs high-speed continuous gas transport pathways within the membrane. This unique intercalated structure provides abundant CO 2 -philic sites, significantly enhancing CO 2 solubility and enabling highly selective gas molecular sieving. Moreover, hydrogen bonds and chelation coordination interactions between ZIF-L/GO and polymer matrix ensure excellent interfacial compatibility while reinforcing structural stability. This supramolecular structural engineering approach effectively mitigates the limitations of traditional membranes, achieving CO 2 permeability of 1000.8 Barrer and CO 2 /N 2 selectivity of 45, exceeding the 2008 Robeson upper bound and approaching the 2019 limit. Additionally, the membrane displays superior mechanical properties and long-term operational stability, providing a promising avenue toward high-performance materials for efficient CO 2 capture.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2026
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IF 6.7
Shuheng Wei,Huiyue Ni,Like Wang,Xiaonan Huang,Jie Zou,Jianhua Zhu,Shouwei Yin
Abstract The enzymatic synthesis of flavor esters is often limited by poor interfacial mass transfer and water-induced equilibrium constraints in conventional systems. Herein, we report a food-grade magnetic Pickering interfacial biocatalysis (PIB) platform based on sodium caseinate (NaCas)–Fe2O3 nanoparticles for accelerated flavor ester synthesis. The nanoparticles, synthesized via a one-pot coprecipitation method, exhibit excellent colloidal stability, CO2/N2-responsive behavior, and magnetic responsiveness. Under an external magnetic field, magnetic actuation induces localized interfacial perturbations that promote substrate exchange at the oil–water interface. Using CALB-catalyzed synthesis of hexyl hexanoate as a model reaction, the magnetically perturbed PIB system achieved over 2-fold higher catalytic efficiency than a static Pickering emulsion within 10 min. Furthermore, CO2/N2 responsiveness enables rapid demulsification and efficient recycling of both nanoparticles and enzymes, with yields exceeding 89% over five consecutive cycles. This work provides a protein-based, magnetically induced interfacial perturbation platform for clean-label flavor ester production.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
·
IF 8.8
Yuxuan Liang,Xiangwei Li,Yuzheng Zhou,Yuchao Wang,Zhe Wang
Mixed matrix membranes (MMMs) offer a promising route to high-performance gas separation by integrating the benefits of fillers and polymer matrices. However, Polymers of Intrinsic Microporosity (PIM-1) suffers from poor interfacial compatibility with fillers and is constrained by the Robeson upper bound. As a result, the selectivity of MMMs remains less than ideal. This study proposes a cross-scale coordination strategy that adjusts the molar ratio of β -cyclodextrin ( β -CD) to the oligomer KH560-M2070 during the synthesis of porous liquids (PLs). This cross-scale coordination boosts MMM performance at both macro and micro levels. Grafting more oligomers increases the porous liquid's fluidity at the macroscopic scale. This effect arises from fewer hydrophilic hydroxyl groups on β -CD and the “like dissolves like” nature of the oligomers. As a result, the filler loading increases from 2 wt% to 10 wt%. KH560-M2070 and β -CD are covalently linked at both ends, creating a graded pore structure (0.41–0.8 nm) at the microscopic level. Our experimental data show that the β -CD PLs (1:0.7)/PIM-1 MMM achieves a CO 2 /N 2 selectivity of 65.68 ± 2.16 at 30 °C, well above the 2019 Robeson upper bound. This cross-scale strategy thus offers a new route for applying porous liquids in gas separation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Daofei Lv,Renfeng Shi,Yongwei Chen,Yang Chen,Houxiao Wu,Xin Zhou,Hongxia Xi,Zhong Li,Qibin Xia
A water resistant zirconium–porphyrin metal–organic framework PCN-222 was synthesized for selectively separating CO2/CH4 and CO2/N2. Isotherms of CO2, CH4, and N2 on PCN-222 at low and high pressures were respectively measured. At 298 K, CO2 uptakes at 100 and 3000 kPa were 1.16 and 13.67 mmol/g, respectively. At 298 K and 100 kPa, CO2/CH4 (50:50, v/v) and CO2/N2 (50:50, v/v) adsorption selectivities separately reached 4.3 and 73.7. At 298 K and 3000 kPa, CO2/CH4 (50:50, v/v) and CO2/N2 (50:50, v/v) adsorption selectivities were 4.7 and 32.8, respectively. Importantly, breakthrough experiments confirmed that PCN-222 could achieve the effective separation of CO2/CH4 (both 50:50 and 10:90) and CO2/N2 (both 50:50 and 15:85) gas mixtures. The dynamic regeneration experiments showed that PCN-222 maintained its initial CO2 adsorption capacity after five cycles of CO2 adsorption–desorption. This work suggested that PCN-222 was a potential candidate for selectively separating CO2/N2 and CO2/CH4.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Xiaoli Ding,Weiji Wang,Xianyun Cheng,Xiaoqian Fan,Hongyong Zhao,Qingping Xin,Yuzhong Zhang
Ether oxygen-rich polymeric membranes emerge as promising membranes in CO 2 separation due to the high affinity between CO 2 molecules and ethylene oxide segments. However, there is a massive challenge in developing asymmetric membranes with high CO 2 permeation performance and CO 2 /light gas separation performance. This work revealed composite membranes with ether oxygen-rich polyimide separation layers were developed by interfacial polymerization between 1,2,4,5-benzenetetracarbonyl tetrachloride and commercial diamines named o,o'-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol followed by thermal imidization. The influences of the polymerization time and monomer concentrations on the gas transport and separation properties of the composite membranes were studied based on single-gas permeation. The optimum membrane possessed a superior high ideal CO 2 /N 2 separation factor of 429 accompanied with a moderate permeance of 150 GPU for CO 2 at 25 o C and 0.2 MPa. The performance stability was studied by operating the membrane at various pressures and temperatures. The result showed the composite membrane possessed excellent plasticization resistivity at high pressures. The separation property of composite membranes for CO 2 /N 2 binary mixture was also evaluated. The influences of the operation parameters, including stage-cut and pressure ratio on the product purity and recovery were investigated. The results showed great practical application potential in efficient separation of flue gas .
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