SEPARATION SCIENCE AND TECHNOLOGY
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2024
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IF 2.3
Chengpeng Zhang,Hongjing Liu,Hanyu Qiu,Wei Zhao,Xu Zhao,Xiaochun Jing,Hui Yao
Nano-organic hybrid materials (Al2O3-NOHMs) were synthesized with nano-alumina as the core, γ-(2,3-epoxypropyl) propyl trimethoxysiane (KH560) as the corona, and three of polyetheramine M2070, D2000, M1000 as the canopy, respectively. Al2O3-NOHMs were used as fillers to prepare MMMs with Pebax as substrate to improve the CO2 separation performance. The Al2O3-NOHMs were characterized by TEM and rheological properties. The results showed that the synthesized Al2O3-NOHMs were liquid-like and had a core-shell structure, which can effectively reduce Al2O3 agglomeration in the membrane. FT-IR analysis of MMMs showed that Al2O3-NOHMs and Pebax were physically blended, TGA indicated that Al2O3-NOHMs do not affect the thermal stability of the membrane, and XRD indicated that the addition of Al2O3-NOHMs destroyed the interchain hydrogen bond of Pebax and reduced the crystallinity of MMMs. The gas permeability of the membrane was tested under ideal gas conditions, compared with pure membrane, the CO2 permeability of Al2O3-NOHM(M2070)/Pebax MMMs and Al2O3-NOHM(D2000)/Pebax MMMs reached 137.15 Barrer (24.68%) and 147.52 Barrer (34.11%), and the selectivity of CO2/N2 reached 77.82 (58.84%) and 72.31 (47.59%) at 30°C and 0.3 MPa, respectively, surpassing 2008 Robeson upper bound.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yueyangchao Yu,Yanting Tang,Longjie Liu,Qingnan Wang,Chongshan Yin,Keming Zhang,Chenlu Liu,Yi Ye,Xinglei Zhao,Tianhe Gu,Shaofei Wang
Covalent organic frameworks (COFs) show exceptional promise for CO2-selective mixed matrix membranes (MMMs) due to their tunable porosity and structural robustness. To mitigate COF aggregation in MMMs, we present an in situ growth strategy by directly integrating COF precursors into a polymer matrix. By optimizing reaction conditions, we achieve uniform dispersion and successful in situ formation of TpPa (derived from 1,3,5-triformylphloroglucinol and p-phenylenediamine) within the Pebax matrix. The optimized membrane exhibits a high CO2 permeability of 313.4 Barrer (45.8% higher than pure Pebax) and CO2/N2 selectivity of 22.6, along with long-term stability. Positron annihilation lifetime spectroscopy further reveals how the integration of COFs modulates the membrane’s free-volume properties. This study not only addresses filler dispersion challenges but also provides a viable approach for fabricating high-performance, stable CO2 separation membranes.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Ziru Yu,Zhenghua Guo,Liang Yu,Xiao Feng,Bo Wang
Various metal–organic framework (MOF)-based porous nanomaterials have been adopted to fabricate mixed matrix membranes (MMMs) aiming at breaking through the Robeson upper bound of individual polymer membranes for gas separation. However, the insufficient compatibility between the polymeric matrix and MOF nanofillers limits the further improvement of their gas separation performance. To overcome this challenge, we constructed relatively ideal Pebax/PEG/NH2–UiO-66 mixed matrix membranes inspired by θ solvent theory of polymer solutions. Polyethylene glycol (PEG) molecules were introduced to selectively swell the polar poly(tetramethylene oxide) (PTMO) domains of the Pebax matrix via hydrophobic–hydrophilic interactions and in turn furnished dispersed “nests” for NH2–UiO-66 nanofillers with polar nature to reduce the interparticle agglomeration (PEG nesting effect). MOF nanofillers tended to be relatively undisturbed, in which either the rigidity of polymer chains or the pore blocking of MOFs seen in unideal MMMs was restricted. The PEG “nesting effect” proposed herein could bring benefits to further improve the allowed maximum loading capacity of MOF nanofillers as well as adjust the interactions therein and therefore maximize the CO2 separation performance of Pebax/PEG/NH2–UiO-66 MMMs. Compared with individual Pebax membranes, Pebax/PEG/NH2–UiO-66 with a 15 wt % loading of NH2–UiO-66 showed a 73% higher CO2 permeability (210 barrer) and a 220% higher CO2/N2 selectivity (130), which demonstrated the most dramatical increases among Pebax-based MMMs until now and as well significantly exceeded the Robeson upper bound. Therefore, the proposed PEG “nesting effect” for the preparation of θ-type MMMs holds promising potential for membrane-based carbon capture and is possibly extended to the preparation of other MMMs.
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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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 20
·50424
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IF 2.52
Junfeng Qian,Tingting Wu,Jianqun Shi,Hao Chang,Donghui Liu,Yichang Pan
Membrane-based technology is an attractive alternative in terms of CO 2 separation. Pebax-based membranes are regarded as potential candidates for CO 2 separation due to the favorable interaction between its poly (ethylene oxide) chains with CO 2 molecules and inorganic fillers. However, the separation performance for CO 2 /CH 4 mixture is still suffered from the moderate gas permeability and selectivity. To overcome this problem, in this work, amino-functionalized zeolite imidazolate framework (ZIF-7-NH 2 ) nanocrystals were used as fillers to blend with Pebax 1657 for fabricating mixed-matrix membranes (MMMs). XRD, Brunauer–Emmett–Teller (BET), scanning electron microscope, and 1 H nuclear magnetic resonance characterization indicated that ZIF-7-NH 2 with the highest crystallinity was synthesized. Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), and Young's modulus showed that it has good interfacial interaction. Gas separation test results showed that both the CO 2 permeability and CO 2 /CH 4 selectivity of the 31 wt% ZIF-7-NH 2 /Pebax MMMs increased by 80 and 170%, respectively. The improved performance is attributed to the addition of ZIF-7-NH 2 nanocrystals and the favorable interfacial interactions between the polymer and ZIF-7-NH 2 nanocrystals. Furthermore, the polyvinylidene fluoride supported hollow fiber composite membranes also exhibit the long-term stability for CO 2 /CH 4 separation.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Membranes
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2019
·Vol. 9
·期 9
·115
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IF 0
Jiuli Han,Lu Bai,Bingbing Yang,Yinge Bai,Shuangjiang Luo,Shaojuan Zeng,Hongshuai Gao,Yi Nie,Xiaoyan Ji,Suojiang Zhang,Xiangping Zhang
Air separation is very important from the viewpoint of the economic and environmental advantages. In this work, defect-free facilitated transport membranes based on poly(amide-12-b-ethylene oxide) (Pebax-2533) and tetra(p-methoxylphenyl)porphyrin cobalt chloride (T(p-OCH3)PPCoCl) were fabricated in systematically varied compositions for O2/N2separation. T(p-OCH3)PPCoCl was introduced as carriers that selectively and reversibly interacted with O2and facilitated O2transport in the membrane. The T(p-OCH3)PPCoCl had good compatibility with the Pebax-2533 via the hydrogen bond interaction and formed a uniform and thin selective layer on the substrate. The O2separation performance of the thin film composite (TFC) membranes was improved by adding a small amount of the T(p-OCH3)PPCoCl and decreasing the feed pressure. At the pressure of 0.035 MPa, the O2permeability and O2/N2selectivity of the 0.6 wt % T(p-OCH3)PPCoCl/Pebax-2533 was more than 3.5 times that of the Pebax-2533 TFC membrane, which reached the 2008 Robeson upper bound. It provides a candidate membrane material for O2/N2efficient separation in moderate conditions.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Leixin Yang,Shengbo Zhang,Hong Wu,Chumei Ye,Xu Liang,Shaofei Wang,Xingyu Wu,Yingzhen Wu,Yanxiong Ren,Yutao Liu,Nayab Nasir,Zhongyi Jiang
For high-performance mixed-matrix membranes (MMMs), it is crucial to design gas transport channels in fillers to rationally manipulate the structure-property relationship. In this study, the novel porous organosilicon nanotubes (PSiNTs) were incorporated into Pebax to prepare MMMs for biogas purification (CO 2 /CH 4 separation). After comparing the separation performance of MMMs containing PSiNTs and MMMs containing non-porous organosilicon nanotubes (SiNTs)，it can be found that the porous structure on wall of organosilicon nanotubes had a significant effect on the improvement of the gas permeability . In addition, the amino-modified PSiNTs (N-PSiNTs) were prepared and introduced into membranes to significantly enhance the CO 2 permeability and CO 2 /CH 4 selectivity. Firstly, the porosity of N-PSiNTs afforded rapid gas transport channels in MMMs and intensified the diffusion mechanism, increasing the CO 2 permeability. Secondly, the reversible reaction between amino groups and CO 2 in MMMs intensified the facilitated transport mechanism, increasing the CO 2 /CH 4 selectivity. In particular, the Pebax-N-PSiNTs with 0.5 wt% and 1 wt% N-PSiNTs exhibited the optimal separation performance, which surpassed 2008 upper bound and were superior to the MMMs incorporated with other kinds of nanotubes.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Bo Wang,Jiayou Xu,Jixiao Wang,Song Zhao,Xinlei Liu,Zhi Wang
Gas separation performance of mixed matrix membrane heavily depends on the pore structure of the nanofillers. Metal-organic frameworks (MOFs) are promising platform materials for constructing molecular-selective pores for specific applications. In this work, deliberately-selected polymers with CO 2 affinity (PVAm, Pebax and PEI) are employed as pore regulators to manipulate the pore chemistry and size of MOF UiO-66 nanoparticles and consequently control gas transport rate of CO 2 and N 2 molecules. The branched polymer (polyethyleneimine (PEI)) grafted UiO-66, denoted as UKI, is beneficial to enhancing the membrane selectivity. The UKI doped Pebax/mPSf membranes exhibit CO 2 /N 2 selectivity up to 278, 6.5 times of the bare Pebax/mPSf membranes. Meanwhile, the CO 2 permeance is boosted from around 690 to 1120 GPU (1 GPU = 10 −6 cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 = 3.35 × 10 −10 mol m −2 s −1 ·Pa −1 ). The block copolymer (poly(ether block amide) (Pebax)) grafted UiO-66, denoted as UKX, is conducive to increasing the membrane permeance. The UKX doped Pebax/mPSf membranes exhibited CO 2 permeance up to 1683 GPU, 2.45 times of the bare Pebax/mPSf membranes. Meanwhile, CO 2 /N 2 selectivity increased from around 42 to 146. Additionally, excellent pressure-resistant property and outstanding stability are observed under simulated flue gas .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
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2019
·Vol. 15
·期 15
·2364-2370
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IF 3.698
Guozhen Liu,Long Cheng,Guining Chen,Feng Liang,Gongping Liu,Wanqin Jin
Mixed matrix membranes (MMMs) made from inorganic fillers and polymers is a kind of promising candidate for gas separation. In this work, two-dimensional MXene nanosheets were synthesized and incorporated into a polyether-polyamide block copolymer (Pebax) matrix to fabricate MMM for CO 2 capture. The physicochemical properties of MXene nanosheets and MXene/Pebax membranes were studied systematically. The introduction of MXene nanosheets provided additional molecular transport channels and meanwhile enhanced the CO 2 adsorption capacity, thereby enhancing both the CO 2 peremance and CO 2 /N 2 selectivity of Pebax membrane. The optimized MXene/Pebax membrane with a MXene loading of 0.15 wt % displayed a high separation performance with a CO 2 permeance of 21.6 GPU and a CO 2 /N 2 selectivity of 72.5, showing potential application in CO 2 capture.
研究领域:
材料科学
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化学工程
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气体分离
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碳捕集与封存
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yuanyuan Wang,Suyue Zhong,Shumin Li,Yangyang Dai,Wenjun Su,Jian Li
Rapid industrialization poses a serious threat to the balance of ecosystems and environmental sustainability, and the application of membrane technology is an effective way to alleviate this situation. Two-dimensional (2D) MXene nanosheets are superior materials for constructing high-performance separation membranes, but their biggest drawback is that they are prone to agglomeration. After alkalizing them, the obtained alkaline MXene (TCOH) nanosheets have hydroxyl-rich surfaces, stabilized structure and great affinity for CO 2 . Based on this, a self-supported TA-ZIF-8/TCOH@Pebax mixed matrix membranes (MMMs) with block polymer Pebax-1657 as matrix and TA-ZIF-8/TCOH as composite filler were prepared in this work. ZIF-8 was modified with tannic acid (TA) to enrich the surface with hydroxyl groups, yielding TA-ZIF-8 that is both pro-CO 2 and well interfacially compatible. The using of TA-ZIF-8 not only improves the selectivity of the separation membrane, but also its mutually repulsive electrostatic force with TCOH can expand the layer spacing of TCOH nanosheets as much as possible, which leads to a rich gas transportation channel of the membrane. Experiments have shown that the prepared TA-ZIF-8/TCOH@Pebax MMM had outstanding separation performance beyond the 2019 Robinson upper bound when the content of TA-ZIF-8 was appropriate. Also, the TA-ZIF-8/TCOH@Pebax MMM showed superior thermal stability, durability and mechanical properties. In summary, the strategy of combining nanoparticles and nanosheets as composite fillers in this study provides an effective way to regulate the low permeance of MMMs. In the meantime, the application of TCOH provides a novel idea for further research on gas separation membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Jiangnan Wang,Long Li,Jinli Zhang,Xueqin Li
The chitosan (CS)-grafted UiO-66-NH 2 (U6N) (CSGUN) was synthesized and incorporated into Pebax matrix to fabricate mixed matrix membranes (MMMs) for boosting CO 2 transport. The excellent CO 2 separation performance was exhibited for MMMs due to the following reasons: U6N with the suitable porosity and abundant CO 2 transport carriers can provide a unique “expressway” for CO 2 to boost CO 2 transport through MMMs. The grafting CS in CSGUN can connect Pebax (regular roads) and U6N (expressway), acting as an “on-ramp” between them to enrich CO 2 and guide CO 2 through U6N in an orderly manner. Thus, the constructed “on-ramp” and “expressway” in MMMs can improve CO 2 separation performance. Furthermore, the CS-MOF networks were formed in MMMs through using CS molecular chains to connect U6N for enhancing CO 2 separation performance of MMMs. Therefore, Pebax/CSGUN MMMs exhibited the excellent CO 2 separation performance with the CO 2 permeability of 558 ± 7 Barrer and the CO 2 /CH 4 selectivity of 37.5 ± 0.7. The study indicated that MMMs with CS-MOF bridged networks had great potential for boosting CO 2 transport by combining “expressways” and “on-ramp”.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Xueqin Li,Jinpeng Hou,Ruili Guo,Zhongming Wang,Jianshu Zhang
Ultrathin microporous nanosheets denoted as Zn-tetra-(4-carboxyphenyl)porphyrin (Zn-TCPP) were synthesized and incorporated into a Pebax MH 1657 (Pebax) polymer to fabricate mixed matrix membranes (MMMs) for efficient CO2 separation. The Zn-TCPP nanosheets with a microporous structure provide high-speed channels for fast CO2 transport and shorten the diffusion pathways, both contributing toward high CO2 permeability. Furthermore, scanning electron microscopy results indicate that the ultrathin Zn-TCPP nanosheets with an ultrahigh aspect ratio (>200) tend to arrange horizontally in the Pebax matrix. The obtained unique cross-sectional structure of the MMMs functions as a selective barrier, allowing repeated discrimination of gases due to the tortuous interlayer of horizontal nanosheets, thus improving the selectivity of the MMMs. In addition, the horizontally arranged microporous nanosheets were found to strongly interact with the membrane matrix and endowed the MMMs with excellent interfacial compatibility, which improved the CO2 permeability and eliminated unselective permeation pathways. Significantly, the optimized CO2 separation performance of the MMMs surpassed the 2008 Robeson’s limit.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2016
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IF 5.557
Shengnan Yu,Zhongyi Jiang,Sen Yang,He Ding,Baofeng Zhou,Kun Gu,Dong Yang,Fusheng Pan,Baoyi Wang,Sheng Wang,Xingzhong Cao
The ubiquitous tradeoff relation between membrane separation performance and swelling resistance is another great challenge other than the tradeoff relation between membrane permeability and selectivity, which significantly restricts the application efficiency of all membrane processes. In this study, graphene nanosheets (GNS) were first functionalized by polydopamine (PDA) coating followed by silver nanoparticle (AgNP) loading to fabricate Ag-PDA/GNS composites, and were then incorporated into the polyether-block-amide, Pebax 2533, to fabricate the Pebax-Ag-PDA/GNS high-performance hybrid membranes. PDA can endow GNS with increased hydrophobicity and consequently increased interfacial compatibility between GNS and Pebax matrix. Ag-PDA/GNS can decrease the crystallinity, increase the fractional free volume, and enhance the swelling resistance of Pebax membrane via multiple interactions at the interface between Ag-PDA/GNS and Pebax. AgNPs were loaded onto the surface of Ag-PDA/GNS composites via the adhesive effect of PDA. AgNPs homogeneously dispersed on the surface of Ag-PDA/GNS, which could endow the membranes with facilitated transport function towards thiophenic components. Moreover, the desulfurization performance of the Pebax-Ag-PDA/GNS hybrid membranes was evaluated using the model gasoline as a separation system. When the filling content is 6 wt%, the separation performance of Pebax-Ag-PDA/GNS hybrid membrane reaches the optimal value, with a permeation flux of 4.42 kg/(m 2 h) and an enrichment factor of 8.76 at the operation temperature of 40 °C; when the operation temperature increases to 70 °C, the enrichment factor decreases to 6.07, however, the permeation flux significantly increases to 22.53 kg/(m 2 h), outperforming most of reported data in literature.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）