Journal of Environmental Chemical Engineering
·
2021
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IF 5.909
Siraj Ahmad,Shaohan Lian,Yaxin Tan,Run Li,Quan Zhao,Chunfeng Song,Qingling Liu,Shijian Lu
Mixed matrix membranes (MMMs) have gained significant attention in CO 2 separation. However, the symmetrical dispersion of inorganic filler nanoparticles during MMMs fabrication is still a crucial challenge. The present work investigates the outcome of N-Methyl-2-pyrrolidone (NMP) and N-N-Dimethyl-formamide (DMF) solvents on MMMs texture, perm-selectivity and nanoparticles dispersion. Scanning electron microscopy (SEM), Fourier-transform-infrared (FTIR) and X-Ray Diffraction (XRD) analyses were also performed for membrane characterization. The MMMs fabricated with NMP solvent showed competitive CO 2 permeability (120.20 barrer) and CO 2 /N 2 selectivity (69.31) compared to the membranes prepared with DMF solvent. It has been indicated that the molar volume, boiling point and solubility parameters were significant factors in the solvent selection. Moreover, the effect of operating temperature on gas transport properties showed substantial impact in perm-selectivity, at 3 bar feed-pressure, with the temperature dropping from 40 °C to 0 °C, the CO 2 /N 2 gases selectivity increased from 69.31 to 105.50, equating to a 64.8% decrease in CO 2 permeability.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Xuebi Du,Shichao Feng,Jianquan Luo,Yongbing Zhuang,Weijie Song,Xuewei Li,Yinhua Wan
Amine-functionalized and metal doped metal–organic frameworks (MOFs) will enable further enhancement of CO 2 adsorption, which holds great promise in mixed matrix membranes (MMMs) for CO 2 /N 2 separation. Four kinds of UiO66 with different sizes have been successfully fabricated by introduction of Ce and/or amino groups in UiO66. The influence of Ce doping on the UiO66 is greatly related to the ligand. Compared with ZrUiO66, the CeZrUiO66 has bigger particle size, lower BET specific surface area and pore volume and a worse CO 2 adsorption capacity. Interestingly, the tendency of Ce-doped ZrUiO66-NH 2 is contrary to the aforementioned. In particular, bimetallic CeZrUiO66-NH 2 has an ultramicroporous structure, small particle size, rich crystal defect, superb CO 2 capture capacity and high CO 2 /N 2 adsorption selectivity, suggesting that the simultaneous introduction of Ce and amino groups is conducive to the enhancement of CO 2 separation. The intrinsic ultramicroporous structure of CeZrUiO66-NH 2 not only offers fast and low resistance transport channels for CO 2 , but also supplies more sites for CO 2 adsorption owning to the doping of Ce and the amino groups. As a result, Pebax/CeZrUiO66-NH 2 (3 wt%) MMMs show the CO 2 permeability of 100.7 Barrer and the CO 2 /N 2 ideal selectivity of 76.4, which is close to Robeson upper bound from 2008. Meanwhile, the Pebax/CeZrUiO66-NH 2 (3 wt%) MMMs present relatively good pressure resistance, which would be advantageous in terms of industrial application.
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
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Dechao Wang,Shan Song,Weirui Zhang,Zhongjie He,Yudeng Wang,Yaping Zheng,Dongdong Yao,Yuting Pan,Zhiyuan Yang,Zhuoyue Meng,Yinyan Li
Liquid-like nanoparticle organic hybrid materials (NOHMs) hold great promise in CO 2 capture due to tailored nanostructures and functionalities. Herein, we demonstrate a facile and generic method to enhance CO 2 selective separation of Pebax-based MMMs by NOHMs. NOHMs with core/corona/canopy structure based on silica with different particle size (120 nm, 220 nm and 380 nm) were prepared, respectively. The basic physicochemical properties of NOHMs and MMMs were examined. Excellent interface compatibility is obtained due to the peculiar property of liquid-like NOHMs in resolving nanoparticles agglomeration. More importantly, CO 2 -philic moieties (EO segments) in canopy (polyetheramine M2070) endow MMMs with a superior CO 2 selective separation. The effect of NOHMs content on mixed gases permeation were systemically investigated. Remarkably, the optimum CO 2 permeability reached 246.7 Barrer and a satisfied CO 2 /N 2 selectivity of 66.4 for membrane (P-NOHMs-120-(15)) was obtained, which were increased by 267.1% and 76.1% compared with pristine Pebax membrane, respectively. Moreover, Grand Canonical Monte Carlo (GCMC) molecular simulation was used to investigate how NOHMs improve CO 2 selective separation by analyzing interaction parameters (interaction energy, density field distribution and isosteric heat). Finally, the enhanced CO 2 selective separation sites were determined. The CO 2 selective separation accelerated by NOHMs proposed in present work provides ingenious inspiration for the development of novel fillers in MMMs due to the tailored nanostructures of NOHMs.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangwei Li,Junjian Yu,Xurong Han,Fei Wang,Shuai Han,Yuchao Wang,Zhe Wang
Mixed matrix membranes (MMMs) with the dual properties of porous materials and polymer matrix membranes have become one of the most optimal solutions to the gas separation problem. However, the adapted porous material and the explicit transport mechanism of gases within the mixed matrix membrane hinder its further commercialization. Thanks to their porous nature and tunable gas adsorption properties, heteroatom-doped porous materials, especially nitrogen-doped porous materials, are widely used to design and prepare advanced CO 2 separation membranes. Herein, a layered two-dimensional nano-sheet with a nitrogen content of 44.7 % was successfully synthesized via thermal polymerization. And nano-sheets were homogeneously dispersed in a Pebax matrix to make a composite film. Since the CO 2 affinity of the nitrogen functional site and the PEO flexible chain, realizing the synergistic improvement of CO 2 permeability and selectivity. A comprehensive combined permeation experimental/simulation characterization reveals the CO 2 transport pathway within the membrane, indicating the mechanism of action of nitrogen-doped porous packing on CO 2 diffusion. Among these, the CO 2 permeability of the mixed matrix film containing 5 wt% sodium poly(heptazine imide) (NaPHI) reached 153 Barrer at a feed gas pressure of 9 bar, nearly 149 % compared to the pure Pebax film. The selectivity of CO 2 /N 2 was enhanced to 105, exhibiting a remarkable increase of 159 % and exceeding the 2019 Robeson limit. Importantly, the present work further reveals and demonstrates the gas separation mechanism of nitrogen-doped porous filler/polymer hybrid matrix membranes, which provides new ideas for the design and application of heteroatom-doped porous fillers in the field of gas separation.
研究领域:
材料科学
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化学工程
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计算模拟
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DOI
高影响因子
MATERIALS LETTERS
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2022
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IF 3.574
Han-Yu Qiu,Hong-Jing Liu,Xue-Li Liu,Hui Yao
In this study, a novel liquid-like nanoparticle organic hybrid materials (NOHMs) is synthesized, in which Al 2 O 3 was used as core, called as Al 2 O 3 -NOHMs, and it has been used for the first time to improve the performance of mixed matrix membranes (MMMs) for CO 2 capture. In addition, the Al 2 O 3 -NOHMs with core/corona/canopy structure observed by TEM possess unique enthalpy effect and entropy effect, which can break through the trade-off effect of membrane separation process. According to gas separation permeation tests, the Al 2 O 3 -NOHMs/Pebax mixed matrix membranes with 2 wt% Al 2 O 3 -NOHMs showed higher CO 2 permeability of 137.15 Barrer and CO 2 /N 2 selectivity of 77.8 compared with neat Pebax membranes, and surpassed 2008 Robeson upper bound. Hence, this novel NOHMs is a very promising alternative to prepare MMMs for CO 2 capture.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Yasi Abi,Weiye Li,Zhihong Chang
A new type of humidification membrane for proton exchange membrane fuel cells composed of polyether-block polyamide (PEBAX) 3533, polyacrylic acid (PAA), and cellulose nanocrystals (CNCs) was fabricated using the electrospinning method. CNCs were used to improve the hydrophilicity of the membrane, and PAA was used to improve the spinnability of the material. Using a scanning electron microscope, the morphology of PEBAX/PAA/CNC composite fiber membranes (CFMs) and electrospun fibers was investigated. Through X-ray diffraction analysis and the tests of water vapor permeability, air permeability, and water contact angles, the effects of CNCs on membrane properties were investigated. The results showed that the addition of CNCs improved the hydrophilicity and crystallinity of the CFM; while the air barrier properties of the CFM improved, the water vapor permeability coefficient of the membranes decreased. When the content of CNCs was 4.8 wt %, the vapor/air selectivity reached the highest value of (2.20 ± 0.05) × 104, which was 14% more than that of the fiber membrane without CNCs.
研究领域:
材料科学
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能源工程
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燃料电池技术
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DOI
高影响因子
E-POLYMERS
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2020
·Vol. 20
·期 1
·171-184
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IF 1.675
Weiye Li,Zhihong Chang,Liming Lin,Xiaoyan Xu
To meet the increasing requirements of membrane humidification in proton exchange
membrane fuel cells (PEMFCs), a series of montmorillonite
(MMT)/PEBAX ® 1074 mixed matrix membranes (MMMs) were fabricated
using the solvent casting method. Pristine MMT and poly(oxyalkylene)amine
(APOP)-modified MMT were added as the filler. Using the XRD, FT-IR, SEM, and TEM, the
morphology and chemical structure of MMT during modification were investigated. Using
the tests of water vapor permeability, air permeability, water contact angle, and
crystallinity, the effects of montmorillonite on membrane properties were
investigated. The results showed that surface hydrophilicity and crystallinity of
MMMs increased as the MMT content increases, which leads to higher vapor permeability
and selectivity than the pure PEBAX ® 1074 membrane. After
modification, APOP-MMT/PEBAX ® 1074 MMMs showed better performance
in vapor permeability and vapor/air selectivity. The best selectivity was 1.7
× 10 5 , which is three times higher than that of pure
PEBAX ® 1074 membrane.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Yinzi Shao,Xueyang Zhang,Wenyi Tan,Yan Zhao,Feiyue Li,Bin Gao
Biochar derived from wheat straw was prepared and subsequently modified with hydrogen peroxide through ball milling, yielding ball-milled wheat straw biochar (BMWB). BMWB/Pebax mixed matrix membranes (MMMs) were prepared by incorporating BMWB into Pebax-1657, and their CO 2 separation performance was evaluated. The results showed that ball milling successfully reduced the biochar particle size, increased its specific surface area, and strengthened the intensity of surface functional groups. Furthermore, hydrogen peroxide modification augmented the oxygen-containing functional groups on the biochar surface, enhancing its hydrophilicity and improving its dispersion within the Pebax-1657. Under the experimental conditions of 25°C and 0.2 MPa, the MMMs loaded with 3 wt% BMWB exhibited significantly enhanced gas separation performance, with a CO 2 permeability of 97.75 Barrer and CO 2 /N 2 selectivity of 62.3. These values represent substantial improvements of 38.8% and 32.8%, respectively, compared to the pristine Pebax-1657 membrane. This enhanced separation performance can be ascribed to two primary factors: (1) the presents of abundant functional groups (e.g., carboxyl and amino groups) on BMWB significantly improved CO 2 affinity; and (2) the intrinsic gas transport channels within BMWB, combined with the tortuous pathways generated by the effective stacking of BMWB particles, synergistically enhanced both CO 2 permeability and selectivity.
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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膜技术
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气体分离
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Ting He,Shanshan Zhang,Yang Zhu,Jiangwei Chen,Xiaoyun Wang,Qingguo Li,Rizhi Chen,Wenbo Pei,Xin Chen,Haibao Duan,Zhaoliang Cui
Extracorporeal CO 2 removal (ECCO 2 R) is a type of extracorporeal life support (ECLS) technology. It aims to remove carbon dioxide (CO 2 ) from small flow of the blood and correct hypercapnia and related acidosis. The ECCO 2 R system removes CO 2 retained in the patient’s body through the gas-blood exchange membranes, which in use, blood flows on the outside of the membrane, and the inside of the membrane is for gas flow. Existing ECCO 2 R system generally improves the emission rate of CO 2 by the increase of the gas flow rate. However, there is a problem that O 2 is simultaneously taken out, which will reduce the blood O 2 concentration. Therefore, the gas-blood exchange membranes should not only increase the CO 2 removal rate by the improvement of CO 2 /O 2 selectivity, but also retain more O 2 in the blood and then maintain the oxygen saturation of the blood. In present work, a method was proposed to fabricate COF-5/Pebax mixed matrix membranes (MMMs) on the PMP surface for enhancing CO 2 /O 2 selectivity, which was increased from 0.96 to 5.57. The CO 2 removal ability of COF-5/Pebax MMM was tested by blood circulation, and it was found that the CO 2 removal effect was increased 10.9% than that of the pristine membranes. The O 2 concentration was maintained at a higher level, about 1.69 times that of the pristine membranes. In contrast to the pristine PMP membrane, blood compatibility of COF-5/Pebax MMMs was improved because protein adhesion decreased by 44.75%. The results of cytotoxicity test and rabbit pyrogen test exhibited that the prepared COF-5/Pebax MMM presented great biosafety. Overall, the proposed COF-5/Pebax MMM has good performance in ECCO 2 R system and attractive potential for medical application.
研究领域:
生物医学工程
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材料科学
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医疗器械
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Minmin Gou,Weifang Zhu,Yanyong Sun,Ruili Guo
Two-dimensional (2D) MOF named Cu(BPY) 2 (OTF) 2 (OTF = trifluoromethanesulfonic acid anion (CF 3 SO 3 − ), BPY = 4,4-bipyridine) possessing axial coordination anion was prepared, and then combined into Pebax® MH 1657 (Pebax) polymer to fabricate mixed matrix membranes (MMMs) for the separation of CO 2 /CH 4 gas mixtures. The inherent microporous structure and interlayer nanochannel that constructed by axial coordination anion CF 3 SO 3 − of Cu(BPY) 2 (OTF) 2 nanosheets provide selective transfer channels for CO 2 . In addition, the group that has an affinity for CO 2 , such as pyridine group and CF 3 SO 3 − anion, locating in the surface and the interlayer of Cu(BPY) 2 (OTF) 2 nanosheets, present better binding affinity and molecule selectivity for CO 2 . Owing to the synergistic effect between structure and functional groups of Cu(BPY) 2 (OTF) 2 nanosheets, the optimized CO 2 separation performance (permeability and selectivity) of the MMMs compared with that of pure Pebax were increased by 86.65% and 47.59%, respectively, under the conditions of pure gas, 0.1 MPa and 25 °C. The open narrow nanochannels and axial coordination anion in Cu(BPY) 2 (OTF) 2 nanosheet, making Cu(BPY) 2 (OTF) 2 a promising material to prepare efficient mixed matrix membrane.
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 Environmental Chemical Engineering
·
2024
·
IF 7.4
Peilin Li,Wenzhong Ma,Jing Zhong,Yang Pan,Xiuxiu Ren,Meng Guo,Nanhua Wu,Hideto Matsuyama
To overcome the "trade-off" effect and simultaneously increase the CO 2 permeability and selectivity of the traditional Pebax membranes. The pyrazine-based nitrogen-doped porous carbon (NPC) was incorporated into Pebax-2533 to fabricate mixed-matrix membranes (MMMs). Firstly, a novel porous organic polymer (POP-1) was prepared using melamine and 2,6-dichloropyrazine as carbon and nitrogen sources. Five NPCs of different nitrogen content (NPC-1, NPC-2, NPC-3, NPC-4, and NPC-5) were obtained by adjusting the carbonization temperature and activator type. The NPCs had a large specific surface area (S BET , 976–2500 m 2 g -1 ) and nitrogen content (up to 7.6–12.9%). The CO 2 adsorption capacity (2.90–3.49 mmol/g), and CO 2 /N 2 selectivity (23.2–37.8) of the NPCs were also high, and their cycle regeneration performance was good. Using Materials Studio 7.0 software to calculate the CO 2 adsorption sites and binding energies of NPCs’ precursors, it was confirmed that the NPCs had a strong adsorption capacity for CO 2 . Then, the synthesized NPC-1 with meso-microporous structure and nitrogen-enriched units were used to prepare NPC-1/Pebax MMMs by the solution casting method. By introducing alkaline nitrogen-containing groups, a continuous meso-microporous structure was constructed within the membrane, forming an "expressway" channel that can promote rapid CO 2 transport. It could significantly improve the CO 2 permeability and CO 2 /N 2 selectivity of the MMMs. When the CO 2 permeability of the MMMs with an NPC-1 content of 3 wt% was 457 Barrer, the CO 2 /N 2 selectivity reached 64.7, much higher than that of the pristine Pebax membrane (approaching the revised Robertson upper bound in 2019). The CO 2 permeability, solubility, and diffusivity coefficient of the MMMs with NPC-1 content of 7 wt% were 491 Barrer, 61.36 cm 3 (STP)/(cm 3 ·cmHg), and 7.05 cm 3 (STP)/(cm 3 ·cmHg), respectively, which were 211%, 101%, and 62% higher than the pristine Pebax membrane. In addition, the 3NPC/Pebax MMMs exhibit excellent mechanical properties (up to 34 MPa), and the gas separation performance does not rapidly decrease after long-term stability for 360 h (15%CO 2 /N 2 ). The above results indicated that pyrazine-based NPC has good CO 2 adsorption ability and can improve the CO 2 permeability and selectivity of Pebax membranes, which provides a further research foundation for the application of NPC in polymer membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Wei Zhao,Hongjing Liu,Chengpeng Zhang,Yuyang Cao,Yuying Xu,Xueli Liu,Zhen Lu
Metal–organic frame UiO-66-NH 2 was modified by 3-glycidyl ether oxypropyl trimethoxysilane (KH560), and KH560-UiO-66-NH 2 was synthetized and added to Pebax to prepare KH560-UiO-66-NH 2 /Pebax mixed matrix membranes (MMMs). The epoxy group of KH560 had an amine-epoxidation reaction with the NH 2 in UiO-66-NH 2 , which prevented UiO-66-NH 2 from agglutinating in the MMMs. In addition, the N H bond and OH bond of KH560-UiO-66-NH 2 could theoretically form hydrogen bonds with CO and N H bonds in the main chain of polymerization, respectively, so as to improve the interfacial compatibility between fillers and polymers. The structure and properties of the filler particles and MMMs were evaluated by Fourier transform infrared spectrometer, x-ray diffraction, scanning electron microscopy, and thermogravimetric analyzer. The results showed that the filler particles were successfully synthesized, and had good crystallinity, uniform size distribution, and good thermal stability. The inorganic and organic interfaces of MMMs had no obvious interface defects. The obtained KH560-UiO-66-NH 2 /Pebax MMMs showed CO 2 permeability of 111.52 Barre and CO 2 /N 2 selectivity of 92.16, which were 85.65% and 88.73% higher than that of pristine membranes, respectively. The gas separation performance of MMMs was significantly improved, exceeding the upper bound of 2008 Robeson.
研究领域:
材料科学
·
化学工程
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）