JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Chensheng Dong,Qingping Xin,Qiang Ma,Kongyin Zhao,Yupeng Kou,Yucheng Pan,Huajian Gao,Lizhi Zhao,Xiaoli Ding,YuZhong Zhang,Wei Huang,Lantian Dong,Xinqi Li
Versatile layered fluoride-cerium nanosheets with thickness about 1.60 nm denoted as F-Ce are fabricated by a convenient and environmentally friendly approach. Then, Pebax-1657 is used as the polymer matrix and F-Ce as inorganic fillers to produce mixed-matrix membranes (MMMs) for gas separation. Versatile functions in enhancing the membrane performances are exhibited by F-Ce with intrinsic dual channels. On one hand, the abundant mesoporous slits in F-Ce enhance gas diffusion, constructs high-speed transport pathways of CO 2 and improve CO 2 permeability; on the other hand, molecular-sieving d -spacing in F-Ce endows MMMs with prominently preferential CO 2 transport, which favors the increment of CO 2 /CH 4 selectivity. Furthermore, F-Ce tends to horizontal arrangement and endows the MMMs with preeminent polymer–nanosheet interfacial compatibility, thereby facilitating the superior performance of F-Ce in MMMs and leading to improvements in both permeability and selectivity. In addition, the F-Ce exhibits an affinity for CO 2 and constructs “CO 2 -philic, CH 4 -phobic” regions in MMMs, and the CO 2 -philic regions significantly improves CO 2 /CH 4 solubility selectivity and selectivity. The permeability and selectivity of MMMs in humidified state come to maximum values, 1508 Barrer and 37, respectively, at 8 wt% F-Ce loading, overcoming Robeson Upper Bound (2008). Besides, the mechanical stability of MMMs was investigated.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zheyuan Guo,Zihan Qu,Hong Wu,Rui Zhao,Yingzhen Wu,Yutao Liu,Leixin Yang,Yanxiong Ren,Chumei Ye,Zhongyi Jiang
Well-connected transport pathways play a critical role in high-performance CO2-facilitated separation membranes. Inspired by the ionic cluster network in polymer electrolyte membranes (PEMs) for fast ion transport, designing a unique CO2-philic cluster network structure is a promising strategy to construct efficient CO2 transport channels in membranes. Herein, a forced induction method is presented to construct a CO2-philic cluster network in membranes. Sulfobutylether-beta-cyclodextrin (sβ-CD) is introduced in a quaternary ammonium polysulfone (QAPSf) matrix. During the membrane formation process, the quaternary ammonium groups on QAPSf are attracted by the sulfonic acid groups on sβ-CD, assembling around and thus forming hybrid clusters. These clusters are swollen and interconnected by water under a humidified state. The hybrid cluster network acts as an effective CO2 transport pathway via clustering quaternary ammonium ion pairs as continuous CO2-facilitated transport sites. Simultaneously, the internal cavity of sβ-CD in hybrid clusters affords additional free volume in membranes, thus enhancing the CO2 permeability. The resultant QAPSf/sβ-CD membrane exhibits an optimal CO2 permeability of 1303 Barrer, a CO2/CH4 selectivity of 39, and good long-term operation stability for 30 days, surpassing the 2008 Robeson upper bound limit. This concept of constructing a hybrid cluster network for facilitated transport is expected to be applicable to explore more advanced PEMs for effective gas separation.
研究领域:
材料科学
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化学工程
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Membranes
·
2021
·Vol. 12
·期 1
·34
·
IF 4.106
Yushu Zhang,Hongge Jia,Qingji Wang,Wenqiang Ma,Guoxing Yang,Shuangping Xu,Shaobin Li,Guiming Su,Yanqing Qu,Mingyu Zhang,Pengfei Jiang
The preparation, characterization and gas separation properties of mixed matrix membranes (MMMs) were obtained from polyimide capped with ionic liquid and blended with metal-organic frameworks (MOFs). The synthesized MOF was amine functionalized to produce UiO-66-NH2, and its amino group has a higher affinity for CO2. Mixed matrix membranes exhibited good membrane forming ability, heat resistance and mechanical properties. The polyimide membrane exclusively capped by ionic liquid exhibited good permselectivity of 74.1 for CO2/CH4, which was 6.2 times that of the pure polyimide membrane. It is worth noting that MMM blended with UiO-66-NH2demonstrated the highest ideal selectivity for CO2/CH4(95.1) with a CO2permeability of 7.61 Barrer, which is close to the 2008 Robeson upper bound. The addition of UiO-66-NH2and ionic liquid enhanced the permselectivity of MMMs, which may be one of the promising technologies for high performance CO2/CH4gas separation.Keywords:mixed matrix membrane;metal-organic frameworks;polyimide;gas separation
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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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
·Vol. 14
·期 1
·120640
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IF 7.2
Yifan Wang,Zeliang Xiong,Shilin Xu,Yuan Gao,Haoli Zhou,Wanqin Jin
Polyimides with intrinsic microporosity are promising materials for gas separation, but their industrial application is hindered by poor long-term stability. This study proposes diamine modification of a polyimide membrane with diamines, such as p-phenylenediamine (p-PD), to enhance both membrane stability and selectivity for separating gas pairs such as CO 2 /CH 4 . Various characterization techniques confirmed the crosslinking reaction between the diamine and imide groups, which restricted the movement or rearrangement of polymer chains, resulting in improved membrane anti-plasticization performance and stability. Meanwhile, CO 2 -philic emeraldine base and quinone structures were formed due to the in-situ oxidation of p-PD during the crosslinking process, which significantly boosted CO 2 /CH 4 selectivity. The maximum selectivity (44.5), which is 66.0 % higher than that of the pristine membrane, was achieved using a p-PD-modified polyimide membrane for the separation of pure single CO 2 /CH 4 . Additionally, the separation of other gas pairs (such as CO 2 /N 2 ) and the effect of pressure on the separation of a CO 2 /CH 4 mixture were investigated using the p-PD-modified polyimide membrane, which demonstrated improved performance. Thus, this study provides a reference for enhancing the selectivity and stability of polyimide membranes through diamine modification using p-PD and its analogues.
研究领域:
材料科学
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膜技术
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气体分离
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高分子化学
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高影响因子
AICHE JOURNAL
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2025
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IF 4
Xinrui Liu,De Ao,Mao Ye,Zhi Wang,Zhihua Qiao,Song Zhao
Metal–organic framework (MOF) glass holds great promise for gas separation applications. However, the inherent low porosity of MOF glass poses a considerable challenge in improving membrane permeability. In this work, a self-supporting MOF crystal-glass composite (CGC) membrane was synthesized via an innovative blending and melting approach, in which ZIF-62 powder was converted into an amorphous glassy phase and ZIF-9 powder was partially flux-melted, effectively preventing the reorganization of Zn─N bonds within ZIF-62. Consequently, the composite component structure significantly enhances the porosity and permeability of the MOF glass membrane. Furthermore, the incorporation of cobalt into the membrane matrix has notably enhanced its adsorption affinity for CO 2 , thereby boosting CO 2 /CH 4 selectivity. The resultant a g [(ZIF-9) 0.2 /(ZIF-62) 0.8 ] membrane has demonstrated exceptional CO 2 permeability of 20,324 barrer and superior CO 2 /CH 4 selectivity, both surpassing the 2018 upper bound. Thus, the innovative strategy for the design of MOF CGC membranes offers effective solutions to the challenges inherent in gas separation processes.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
ENERGY & FUELS
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2023
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IF 5.3
Chuanhong Wang,Xuefang Chen,Shimiao Yao,Fen Peng,Lian Xiong,Haijun Guo,Hairong Zhang,Xinde Chen
The morphology and regeneration ability of adsorbents are important for gas pressure swing adsorption and separation. Herein, HCP-1 (a hyper-crosslinked polymer) and HCP@MAO(Fe) (a hyper-crosslinked polymer modified by ferrocene) with a spherical morphology are synthesized by a post-crosslinking reaction of chloromethylated styrene-divinylbenzene (Cl-St-DVB) beads for the separation of CO2/CO and CO2/CH4. Both static adsorption and dynamic separation tests verified that HCP@MAO(Fe) has the best gas adsorption and separation performance. The highest adsorption capacity of CO2 reached 1.24 mmol/g. The IAST selectivity of CO2/CO is up to 20.6. Moreover, HCP@MAO(Fe) can be regenerated by simple vacuum operation, contributing to the low value of adsorption enthalpy (24.5 KJ/mol). The adsorption mechanism between CO2 and the resin framework was also studied by experiments and electrostatic potential map analysis. A stronger interaction can be found between CO2 and HCP@MAO(Fe) as a result of the higher Mulliken charge of the cyclopentadiene structure.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Tong Zhang,Liming Deng,Pei Li
Previous studies demonstrate that decarboxylation cross-linking improves both the plasticization resistance and gas separation properties of a polymer precursor. However, when the decarboxylation reactions were carried out at low temperatures (350–400 °C), gas permeability was low because of the intrinsically low gas permeability of the polymer precursor. In this work, we synthesized a series of highly permeable polymer precursors having a triptycene-based Tröger’s base (TB) backbone structure and different amounts of carboxylic acid side groups. The TB polymer precursors were heated in a temperature range of 275–400 °C to induce cross-linking. After cross-linking, a more open polymer structure was obtained, resulting in an increase in the free volume fraction and gas permeability. The lowest cross-linking temperature was 350 °C and the separation performances of the cross-linked polymers surpassed the “2008 Robeson Upper Bound” for the CO2/CH4 and O2/N2 gas pairs. Moreover, the cross-linked polymers were not plasticized by CO2 at a pressure up to 30 bar.
研究领域:
材料科学
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聚合物化学
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气体分离
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 33
·e52810
·
IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
研究领域:
材料科学
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化学工程
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Dan Liang,Yunfeng Hu,Qiang Bao,Jian Zhang,Jiawei Feng,Penglai Sun,Yutong Ma,Hongsheng Zhang
Rho zeolite was successfully synthesized by hydrothermal synthesis adopting 18-crown-6 as template, and the cations (H + , Na + , K + , Cs + , Cd 2+ and Pb 2+ ) of different radii were introduced into the framework of Rho by ion exchange. The samples were characterized by XRD, SEM-EDX, ICP and N 2 -BET. The adsorption behavior of CO 2 and CH 4 on cation-exchanged Rho was measured, and the adsorption isotherm was fitted by Langmuir equation to study the adsorption performance of these zeolites. The adsorption results show that the pore size of Rho is not solely dependent on the cation radius, the different positions of the cations are also more crucial in pore size adjustment. In all researched Rho, the introduction of Cd 2+ and Pb 2+ can more significantly reduce the pore size, and completely restrict the entry of CH 4 , thereby further improving the CO 2 /CH 4 selectivity. Therein, Cd-Rho has the best adsorption performance, with considerable CO 2 adsorption capacity, and extremely high CO 2 /CH 4 selectivity and CO 2 working capacity, which provides a new clue for the development of adsorbents for CO 2 and CH 4 separation in PSA process.
研究领域:
材料科学
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环境工程
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
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IF 5.1
Qingnan Wang,Yueyangchao Yu,Longjie Liu,Yi Ye,Xinglei Zhao,Chongshan Yin,Bin Liu,Shaofei Wang
Efficient separation of CO 2 from CH 4 is a critical unit operation for biogas upgrading and achieving carbon neutrality goals. While mixed-matrix membranes (MMMs) offer an energy-efficient alternative to traditional separation processes, their industrial deployment is often restricted by engineering challenges, specifically filler agglomeration and non-selective interfacial defects. Herein, we report a novel MOF (metal–organic framework) gel network templated polymerization strategy that effectively circumvents these limitations. In this approach, a continuous, pre-formed network of UiO-66 MOF gel serves as a structural scaffold, within which the 6FDA-ODA polyimide matrix is directly polymerized. This method fosters exceptional interfacial adhesion and uniform dispersion of the filler, successfully eliminating non-selective defects. The resulting MMMs exhibit remarkable gas separation performance, with the optimal membrane (MA-0.075, with 1.6 wt% UiO-66 gel loading) achieving a CO 2 permeability of 30.9 Barrer and a CO 2 /CH 4 selectivity of 135.5 under mixed-gas conditions. This represents enhancements of 212 % and 162 %, respectively, over the pristine 6FDA-ODA polyimide membrane, surpassing the 2008 Robeson upper bound. Furthermore, the membrane demonstrated excellent operational stability over 120 h. This work provides a scalable fabrication route for advanced MMMs, demonstrating significant potential for energy-efficient gas separation applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Yanan Li,Jiangnan Yu,Yu Jiang,Yang Liu,Jun Wang,Minxia Wang,Zhaomin Li,Xueqin Li
A dual transport channels network constructed within mixed matrix membranes (MMMs) has revealed the potential to enhance separation performance. In this study, Cu-TCPP(BA) nanosheets with unsaturated copper sites were synthesized as suitable fillers. Subsequently, Cu-TCPP(BA) nanosheets were incorporated into Pebax® MH 1657 (Pebax) to fabricate MMMs for CO 2 separation. Cu-TCPP(BA) nanosheets significantly enhance CO 2 /CH 4 separation performance by constructing dual transport pathways within the mixed matrix membrane. This mechanism centers on the dual pathways: on one hand, gas molecules can diffuse through the intrinsic microporous channels of the nanosheets; on the other hand, they can also be transported via the interlayer channels formed by the stacking of nanosheets. The synergistic effect of these two pathways collectively enhances the efficient permeation and selective sieving of CO 2 . Furthermore, the regularly aligned unsaturated copper sites on the nanosheet surface act as strong Lewis's acid active centers, preferentially adsorbing CO 2 molecules through quadrupole moment interactions, which provides the chemical basis for high separation selectivity. The adsorbed CO 2 then rapidly diffuses along the dual pathways, forming an “adsorption-diffusion” synergistic transport network. In comparison to pure Pebax membranes, the mixed matrix membranes (MMMs) infused with 3 wt% Cu-TCPP(BA) demonstrated excellent CO 2 separation performance, exhibiting a 77% enhancement in CO 2 permeability and a 44% improvement in CO 2 /CH 4 selectivity. The use of 2D fillers to create a dual transport channels network is an efficiency approach for enhancing CO 2 separation in MMMs.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120850
·
IF 7.2
Xiaohua Tong,Enyang Zhang,Guangran Shao,Ming Yuan,Boyi Song,Wangqing Zhang
Polymer blending is a simple and cost-effective method to improve the gas separation performance of polyimide membranes, thereby potentially overcoming the inherent permeability/selectivity trade-off effect. However, its application still faces challenges, since only a few polymers are miscible with polyimides, and the mechanical property of the membranes usually reduces significantly after polymer blending. Herein, we prepare membranes by blending polyimide containing bulky isopropyl substituents with a small amount of polar polymers such as polyacrylonitrile (PAN). The resultant blend membranes using PAN as additive not only possess excellent gas separation performance but also maintain good mechanical property. For example, when 0.8 wt% PAN is added, the corresponding blend membrane displays a high CO 2 permeability of 632.2 Barrer and a high CO 2 /CH 4 selectivity of 23.4 under humidified condition, close to the 2008 Robeson upper bound, which is attributed to the formation of micro-phase separation structure within the blend membranes. Moreover, the tensile strength of the blend membranes using 0.8 wt% PAN as additive is only 12 % lower than that of the pure polyimide membrane. In addition, the blend membranes using PAN as additive show remarkable stability against physical aging and outstanding long-term operation stability, suggesting their great prospect for natural gas purification and biogas upgrading.
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高影响因子
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