HIGH PERFORMANCE POLYMERS
·
2019
·
IF 1.584
Yayun Zheng,Xing Yang,Meng Yuan,Jujie Luo
Two novel gas separation membranes (Phenyl(Ph)-poly(ether ether ketone)s (PEEKs) and PEEKs) based on PEEKs with a high fractional free volume were designed and synthesized. The structure and thermodynamic stability of the membranes were investigated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The two membranes, which were determined to be high-molecular weight polymers by gel permeation chromatography, showed good solubility in a weakly polar solvent. The gas transport properties of the Ph-PEEK membranes were investigated for different gases (CO2, O2, CH4, and N2) at 25°C and 1 atm. The Ph-PEEK-3 membrane with the largest free volume had the largest gas permeability coefficient and maintained good selectivity. The effect of operating temperature on the gas permeation of the Ph-PEEK-3 membrane was also investigated, and the maximum permeability of the four single gases was reached at 55°C and 1 atm.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
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2015
·Vol. 22
·期 2
·1-14
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IF 1.92
Li Hongbin,Shi Wenying,Zhang Yufeng,Zhou Rong
Poly( p -phenylene terephtalamide) (PPTA) reinforcing blends are of great scientific interest, however the thermodynamic difference of the components make them incompatible with inferior physical-chemical properties. In this work, with the aim of exploring novel separation membrane materials, PPTA/poly(vinylidene fluoride) (PVDF) reinforcing blends were prepared by a novel reactive blending technique of in situ polymerization (method І), and the conventional solution blending (method Π), respectively. The effects of these two methods on polymers compatibility were investigated and compared through ATR-FTIR, XRD, XPS and FESEM characterization. Thermal stability, surface hydrophilicity and mechanical properties were measured through TG, water contact angle (WCA) and tensile measurements. It was found that stronger intermolecular interaction especially hydrogen bonds between polymer components in in-situ blends prevented PVDF from crystallization and a continuous phase configuration appeared. However, slution blends showed an obvious two-phase structure in FESEM observation which varied from a spherical crystallization of PVDF at low PPTA content to a fibrous-like crystallization of PPTA at high PPTA concentration. Solution blends showed lower hydrophilicity which was attributed to the PPTA crystallization and its perpendicular uniplanar orientation along blend film surface. In-situ blends exhibited higher tensile strength which was due to the better polymers compatibility between the rigid reinforced PPTA molecules and flexible PVDF matrix. The PPTA/PVDF in-situ blend is a promising candidate for the high-performance separation membrane material.
研究领域:
材料科学
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高分子化学
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膜技术
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DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Nan Sun,Pengjia Dou,Wentao Zhai,Hailong He,Long D. Nghiem,Vahid Vatanpour,Yuebiao Zhang,Changkun Liu,Tao He
To extract lithium from salt lake brine involves a process of separation and concentration. After separating lithium from brine, the lithium ion concentration is generally a few hundred mg/L which is far below the required 20-30 g/L (as Li + ) before precipitation as lithium carbonate. The concentration step of a lithium enriched brine is crucial but highly energy-intensive. Spontaneous forward osmosis (FO) technology offers the possibility for concentrating lithium ions with low energy. Because the concentrating process involves both feed and draw solution with very high salinity, it is highly desirable to have a high performance FO membrane with a low structural parameter as well as a high rejection to ions. In this work, thin polyethylene separator supported FO (PE-FO) membranes were prepared and post-treated stepwise with benzyl alcohol (BA) and hydraulic compaction. The effect of the post-treatment on the FO performance was systematically analyzed. Excellent FO performance was achieved: the water flux and reverse salt flux selectivity were 66.3 LMH and 5.25 L/g, respectively, when the active layer is oriented towards the 0.5 M NaCl draw solution with deionized water as the feed. To the best of our knowledge, this FO flux is the highest ever reported in the open literature under similar test conditions. Applied in concentrating lithium enriched brine, the membrane showed superior water flux using saturated MgCl 2 as draw solution. A new FO model was established to simulate the water flux during the concentration process with good agreement with the experimental results. The promising results using PE-FO membrane for lithium enrichment opens a new frontier for the potential application of FO 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
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 23
·2213974
·
IF 19
Liuxin Li,Chunjia Luo,Xushuai Chen,Na Chu,Le Li,Min Chao,Luke Yan
Multifunctional separation membrane is usually realized by multi-component collaborative construction, which makes the membrane preparation method complicated and uncontrollable. Herein, a novel multifunctional photocatalytic separation membrane is prepared by vacuum self-assembly of single seaweed-like g-C 3 N 4 photocatalyst. The seaweed-like g-C 3 N 4 gives membrane certain roughness, large specific surface area, excellent hydrophilicity and abundant transport channels. Through a systematic study, the membrane exhibits excellent separation of five oil-in-water emulsions with a maximum flux of 3114.0 ± 113.0 L m −2 h −1 bar −1 for 1, 2-dichloroethane-in-water (Dc/W) emulsion and a maximum efficiency of 97.4 ± 0.1% for chloroform-in-water (C/W) emulsion. In addition, the seaweed-like g-C 3 N 4 with large specific surface area and narrow bandgap render excellent visible light absorption characteristics and accelerate e − -h + pairs transport rate, giving the membrane excellent photocatalytic degradation and antibacterial properties. The membrane shows good degradation for eight different pollutants, among which the degradation effect for rhodamine B (RhB), methylene blue (MB), and crystal violet (CV) were ≈100%. The antibacterial efficiency against E. coli and S. aureus is also close to 100%. After 35 consecutive separations of C/W emulsion and 10 consecutive degradations of RhB, the membrane still maintains excellent separation performance. This long-lasting multifunctional separation membrane exhibits broad application prospects in complex wastewater purification.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 7
·3500-3510
·
IF 5.503
N. Angulakshmi,R. Baby Dhanalakshmi,Paulina Półrolniczak,Mariusz Walkowiak,Pengfei Xie,Xiaohui Tian,Yingke Zhou,A. Manuel Stephan
Controlling the shuttling of lithium polysulphides (LiPS) to enhance the utilization of elemental sulfur has been considered as an important issue to improve the energy density and coulombic efficiency of lithium–sulfur batteries. The present work is aimed at demonstrating a simple preparation of a bi-functional trilayer membrane by coating Li7La3Zr2O12 and activated carbon on either side of the commercial membrane (Celgard 2320). The coated membrane was characterized by ionic conductivity, thermogravimetric and contact angle analyses. In the trilayer membrane, each component acts for a particular purpose: the activated carbon not only acts as a barrier for the migration of polysulfide but also provides additional pathways for electron transport for the insulating sulphur cathode, while the porous Celgard separator facilitates the migration of lithium ion, and the Li7La3Zr2O12 not only promotes the lithium ion migration by percolation but also prevents polysulfide shuttling via the electrostatic repulsive force. The coated membrane offered higher ionic conductivity and thermal stability compared to the uncoated one. The lithium–sulfur battery with the coated separator delivered higher specific discharge capacity than the uncoated separator. XPS studies revealed the absence of polysulfide deposition on the lithium metal surface after the charge–discharge cycling, which further confirms the suppression of polysulfide shuttling by permselective membranes.
研究领域:
材料科学
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电化学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 50
·31675-31687
·
IF 3.361
Chengmin Hou,Congjun Cao
At present, the preparation methods of oil–water separation membranes include chemical vapor deposition, electrospinning, atom transfer radical polymerization, etc. Basically, they all have issues of low recycling rate and incontinuous use. In this paper, the epoxy polymer P(GMA-r-MMA) obtained by traditional radical polymerization of glycidyl methacrylate (GMA) monomer and methacrylic acid (MMA) monomer, and pentafluoropropionic acid (PFPA) is used to modify polymer P(GMA-r-MMA) to obtain fluorine-containing epoxy polymer P(GMA-r-MMA)-g-PFPA. Secondly, fluorine-containing epoxy polymer P(GMA-r-MMA)-g-PFPA and amino-modified nano SiO2 is blended, and the cotton fabric is dip-coated to obtain a superhydrophobic surface, thereby preparing an oil–water separation membrane. By controlling the solution concentration, dipping time, drying time and other conditions, the superhydrophobic performance of the separation membrane was characterized, and the best construction conditions for the superhydrophobic surface were obtained: 0.3 mg mL−1 polymer concentration, immersion time 6 h, drying temperature 120°, and drying time 4 h, and the maximum water contact angle can reach to 150° ± 2°. Finally, the cotton fabric was modified under the best dipping conditions, and used as an oil–water separation membrane to study the oil–water separation performance of n-hexane, n-octane, kerosene, chloroform and water mixtures in batch operation and continuous operation. In batch operations, the separation efficiency can reach 99% and can achieve 5 consecutive high-efficiency separations without intermittent drying. In continuous flow operation, oil–water separation can last for more than 12 hours and the separation efficiency can reach 98%. It also has stable oil–water separation performance for oil–water emulsion.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaobao Gong,Ping Gao,Yu Ji,Mingle Ding,Jianyong Yu,Shichao Zhang,Bin Ding
Two-dimensional (2D) nanoscale building blocks have gained significant interest in fields ranging from energy and environment to healthcare. Nevertheless, designing such large-sized nanoarchitectured materials based on environmentally friendly solvents has been regarded as a long-standing challenge. Here, the green electrospinning/netting technique employing water/ethanol as solvent is reported to assemble nanofibers and nanowires into 2D nanoarchitectured nanofiber/networks. Manipulation of the simultaneous injection and phase separation of jets and droplets from the Taylor cone enables the formation of nanofibers and nanowire (∼30 nm) networks on a large scale. Benefiting from the simplicity and universality, a wide variety of environmentally friendly 2D nanofiber/networks including waterborne polyurethane, ethanol-soluble polyamide, polyvinyl butyral, polyacrylic acid, and polyvinyl pyrrolidone have been fabricated. The developed nanofiber/nets membranes exhibit unique nanostructure, robust mechanical properties, and satisfactory application performances in areas of gas–solid separation (filtration efficiency of 99.9 % and resistance of 103.8 Pa), liquid–solid separation (rejection efficiency of 99.3 % and permeate flux of 3554.1 L m −2 h −1 ), and gas–liquid separation (waterproofness of 105 kPa and breathability of 3858 g m −2 d −1 ). This research could provide insights into the design and development of high-performance 2D nanomaterials for wide separation applications.
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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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mengying Li,Sha Cheng,Jisong Zhang,Cheng Huang,Jiapei Gu,Jin Han,Xu Xu,Xiao Chen,Pengchao Zhang,Ya You
Lithium-ion batteries (LIBs) play a critical role in modern portable electronic devices, electric vehicles, and wearable electronics. However, the formation of lithium dendrites during cycling results in serious capacity loss and safety risks owing to the heterogeneous transport and deposition of Li + . In this work, we present a poly(vinylidene fluoride) (PVDF)-based composite membrane with a continuous metal–organic framework (MOF) layer as high-performance separators in LIBs. The PVDF membranes with uniform pore structures are prepared by using superspreading strategy, facilitating the growth of continuous and controllable MOF layer inside the membranes via a simple interfacial synthesis. The as prepared PVDF-MOF composite membranes display uniform and continuous subnanochannels with connected opened metal sites (OMS), which can generate a homogeneous transport of Li + . Taking advantages of the low impedance (∼2 Ω), high ionic conductivity (0.61 mS cm −1 ), and high stripping peak current (0.89 mA cm −2 ), the PVDF-MOF composite separators efficiently prevent the uneven deposition and the generation of lithium dendrites. Moreover, the PVDF-MOF-based LIBs showed a high capacity retention rate of 81.0 % after 250 cycles. This strategy paves a new avenue for MOF-based composite separator in LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jie Wang,Bingyan Yu,Keru Hou,Yating Ji,Xiaoyan Li,Chengcheng Li,Chengjian Yao,Zaisheng Cai
Membrane separation technology is widely used in separating oily wastewater, where pH-responsive membranes can cope with different conditions of oil-water separation. However, it is limited by membrane contamination during application. A multifunctional oil-water separation membrane (HATP@CN) with photocatalytic performance and pH response was prepared. The wettability of the membrane can be switched by adjusting the pH quickly, which has hydrophobicity when pH ≤ 7 and hydrophilicity when pH ＞7, and it has stable pH responsiveness. The separation effect of membrane on different kinds of oil-water mixtures under different response conditions was explored. The results showed that the separation efficiency of HATP@CN on heavy oil/water mixture and light oil/water mixture was higher than 96.3 % and 99.2 %, respectively, and the separation flux was higher than 6800 L·m −2 ·h −1 and 10000 L·m −2 ·h −1 , respectively. After 50 cycles of separation, HATP@CN still had good separation effects. At the same time, it can also separate water-in-oil emulsion and oil-in-water emulsion. The loading of TiO 2 endows the membrane with excellent photocatalytic performance, which has a high degradation ability of over 90 % within 6 min for various dye solutions. Even in dynamic filtration and separation, MB can be rapidly degraded to realize water purification. This study provided an effective strategy for applying membranes in complex oil-water separation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Hui Li,Shaopeng Gan,Jianqiang Zhang,Kangxing Wei,Xu Zhu,Xilu Liu,Lei Zhu,Hongbo Zeng,Qingzhong Xue
Advanced membranes are urgently needed in concentration, purification and separation of various industrial emulsions. However, their performance is impeded by issues such as membrane fouling and the inherent trade-off between separation efficiency and permeation flux. In this work, an interfacial demulsification and antifouling membrane was achieved through self-releasing high concentration of hydroxide ions on the membrane surface in a dynamic manner. These hydroxide ions can facilitate the emulsified oil droplets on the membrane surface to demulsify by greatly decreasing their Debye length and suppressing their electric double layer repulsion. In this way, the emulsified oil droplets could aggregate into large ones and rapidly detach from the membrane surface, mitigating the challenges of membrane fouling and trade-off. Thus, the membrane exhibits outstanding antifouling ability, achieving high efficiency (99.79 %) and flux (3046 L m −2 h −1 bar −1 ) in long-term oil/water emulsion separation. This ionic self-releasing membrane is easy to manage, requires no reagent consumption, and causes no pollution. This work provides a promising solution and valuable insights into membrane separation and emulsion-related systems.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Yingying Wei,Qian Du,Yang Wang,Pengcheng Gao,Zhifei Wang,Yong Jiang
Membrane separation technology plays an important role in nanosize-based molecules separation. The two-dimensional mesoporous membranes have attracted considerable attention for nanosize-based molecules separation. In this work, unsupported mesoporous silica nanosheets (MSNS) were prepared by the growth of template at the water/n-hexane interface using surfactant of cetyl trimethyl ammonium bromide (CTAB) micelles as templates. During the preparation process, the surfactant CTAB was removed to obtain pure two-dimensional MSNS through be washed with ethanol, followed by freeze-drying. The two-dimensional MSNS had uniform nano-pores structure, ultra-thin thickness and high surface area. The pore diameter of MSNS could be controlled by changing the concentration of n-hexane (4–10 nm). By depositing 0.50 mg of MSNS on cellulose acetate (CA) membrane, the CA-MSNS membrane could be used to purify nanosize-based molecules (such as proteins). When the CA-MSNS membranes was used to filter cytochrome c (cyt c) solution and ovalbumin (OVA) solution respectively, 93.46% of cyt c and 47.27% of OVA could pass the CA-MSNS membranes. However, after four times of filtration, OVA molecules were almost completely blocked and cyt c with purity of 99% could be obtained. Moreover, 92.23% of OVA molecules could be recycled through the elution from the surface of CA-MSNS membranes. The results indicated that two-dimensional CA-MSNS membranes had great application potential in the purification of nanosize-based molecules.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Rongxin Lin,Faguang Ma,Wendong Xing,Jianming Pan
Three-dimensional (3D) basswood materials, for the first time, were successfully used for the construction of rare-earth Nd(III)-imprinted nanocomposite membranes. Herein, polydopamine (PDA)-modified layers could be initially synthesized on basswood surfaces. After the double-bonded modification procedure, the 3D wood-based ionic imprinted membranes (3DW-IIMs) system was finally accomplished by developing a re-modified two-step-temperature free radical polymerization process. The as-design PDA@basswood surface structure was first proposed and applied as imprinting-initiated factors for the preparation of Nd(III)-imprinted sites. Importantly, excellent rebinding capacity (120.87 mg g −1 ), adsorption kinetics and permselectivity coefficients (more than 10) were achieved successfully. Furthermore, an important research result had also been found that the PDA-modified layers caused significant promotions to the rebinding capacities of the as-prepared 3DW-IIMs, that is to say, more and more Nd(III)-imprinted sites could be synthesized because of the PDA-modified surfaces. The as-obtained selective rebinding and separation results together with the green natural wood-based materials strongly demonstrated that our synthesis methodology of 3DW-IIMs had great potential for applications in various fields of rare earth separation, chemical industry, and environment protection.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）