JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhongxiang Bai,Lingling Wang,Chenchen Liu,Changkai Yang,Guo Lin,Shuning Liu,Kun Jia,Xiaobo Liu
Forced surface segregation of hydrophilic nanoparticles on the hydrophobic polymer matrix is considered as the effective strategy to fabricate high performance hybrid membrane for oil/water separation. In this work, the halloysite nanotubes (HNTs) were successively modified with dopamine (PDA) and tannic acid (TA) coatings to obtain the hydrophilic nanoparticles (NPs) of HNTs-DA-TA. Next, the obtained HNTs-DA-TA NPs were blended with polyethersulfone (PES) to prepare the oil/water separation membrane via the phase inversion in the coagulation bath containing Fe 3+ . We have found that the interfacial coordination between TA and Fe 3+ is able to enhance the surface segregation of hydrophilic HNTs-DA-TA NPs on hydrophobic PES membrane, which not only contributes to the formation of asymmetric porous membrane, but also can prevent the loss of nanotubes during the phase transitions. Thanks to these advantages, the water flux of nanocomposite membranes was significantly increased (up to 682 L m -2 h -1 ), which was ~3.4 times than that of the pristine PES membrane (199 L m -2 h -1 ), whereas the rejection was still kept at a high state. After three cycles of separation, the water flux recovery rate can reach up to 91%, which was also much higher than 56% of the pristine PES.
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
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 45
·2204612
·
IF 19.924
Zhongxiang Bai,Kun Jia,Shuai Zhang,Guo Lin,Yumin Huang,Xiaobo Liu
The porous polymeric membranes prepared by conventional nonsolvent-induced phase separation (NIPS) suffer from notorious fouling pollution during oil/water separation. Herein, an improved one-step NIPS strategy is proposed to fabricate anti-fouling polyethersulfone (PES) based membranes that bear hierarchically spherical structures on the interface and an internalized gel network. More specifically, the hydrogen bonding between hydrophilic additives of polyvinylpyrrolidone (PVP) and tannic acid (TA), as well as Fe 3+ -TA coordination interaction are orchestrated to modulate their surface segregation behaviors during NIPS, leading to in situ generation of the interfacial assembled nanospheres and embedded gel networks in the PES matrix. Thanks to the synergistic effect of these dual antifouling barriers, the optimized membrane exhibits super-hydrophilic/underwater super-oleophobic properties, and displays high efficiency as well as good recyclability in separating surfactant stabilized oil-in-water emulsions. In addition, this improved NIPS methodology allows dip coating of various porous substrates to separate diverse oil/water mixtures, which also exhibits good anti-fouling ability. Basically, this study will provide new insights for design of anti-pollution oil/water separation materials by the phase inversion method.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Min Li,Chenglong Qiu,Tulai Sun,Xiaosa Wang,Liwei Xia,Xinying Yang,Wei Zhao,Huaijie Shi,Lei Ding,Xing Zhong,Yihan Zhu,Jianguo Wang
A major challenge that limits the applications of nanostructured electrocatalysts is precise surface structure regulation. The critical performance-impeding factors for the important electrochemical ozone production (EOP) lie in the leaching-induced poor stability as well as the competing oxygen evolution and ozone production reactions over the most promising platinum-based electrocatalysts. Although composition diversification by alloying appears to be a prevailing strategy to optimize platinum-based electrocatalysts, a practical restriction turns out to be the inevitable surface segregation and termination of platinum-enriched structures due to their lower surface energies. In this work, we introduce the nanoconfinement of intermetallic platinum–nickel nanostructures encapsulated by boron carbide, which effectively frustrates the surface segregation of alloy nanostructures and well maintains the pristine termination of the alloy. Precise atomic-level structural elucidation and model construction of the encapsulated alloy nanostructures are achieved by quantitative electron microscopy. The composite nanoalloy with a unique surface termination evokes synergetic catalytic effects that promote the charge transfer between the surface and adsorbed oxygen intermediates, which entails outstanding EOP performance with a high Faraday efficiency of 14.8% in neutral media and long-term stability of up to 120 h as a qualified electrocatalyst for the EOP electrolyzer devices. More importantly, the current work paves a new route to overwhelm the thermodynamically limited surface structures of bare nanoalloy catalysts through diverse nanoconfinement strategies.
研究领域:
材料科学
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电化学
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催化科学
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DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Yudi Guo,Erqing Zhao,Xijuan Zhao,Chenyang Zhang,Lu Yao,Xiaowei Guo,Xiaoping Wang
The synergistic effects of electric field and polymer structures were innovatively introduced to achieve uniform, beads-free, and robust superhydrophobic electrospun fibers. Aminopropyl triethoxysilane (APTES) terminated block copolymers of APTES-poly (methyl methacrylate)- b -poly (dodecafluoroheptyl methacrylate) (APTES-PMMA- b -PDFMA) and APTES-polystyrene- b -PDFMA (APTES-PS- b -PDFMA) were synthesized via atom transfer radical polymerization (ATRP) and electrospinning in a positive electric field. Uniform, beads-free, and robust superhydrophobic electrospun films were fabricated with APTES-PS- b -PDFMA involving small amount of PDFMA segment. XPS results display that effective surface fluorine enrichment is more easily achieved on APTES-PS- b -PDFMA than on APTES-PMMA-b-PDFMA which involves large amount of DFMA. The mechanism can be summarized as follows: negatively charged block PS in positive electric field migrates towards the core of electrospinning jets, and block PMMA has a better positive charging stability than block DFMA, resulting in preferential surface segregation . This investigation will provide an important instructive value in controllable fabrication of robust superhydrophobic electrospun films applied in the fields of textiles, oil-water separation, membrane distillation, etc.
研究领域:
材料科学
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yuhan Yang,Fu Zhao,Zhao Zhang,Yanan Liu,Zongmei Li,Xiaocui Wei,Tingyuan Wang,Chunyang Fan,Zhongyi Jiang
The surface segregation method, as an in-situ surface modification method, has been increasingly used to construct heterogeneous membrane surfaces with hydrophilic microdomains and low surface energy microdomains. Herein, we constructed a heterogeneous antifouling membrane surface using electrostatic interaction enhanced surface segregation method with negatively charged perfluorosulfonic acid (PFSA) as surface segregation agents in casting solution and positively charged polyethyleneimine (PEI) as crosslinker in coagulation bath. The electrostatic interaction between PFSA and PEI enhanced the driving force of surface segregation, intensifying surface segregation of PFSA and residence stability of PFSA and PEI to construct low surface energy microdomains and hydrophilic microdomains, respectively. The resulting membrane exhibited super-oleophobicity and super-low oil adhesion underwater. Meanwhile, the addition of PFSA facilitated the phase inversion to enhance membrane permeability. Accordingly, our membrane exhibited water permeation flux of 367 L m −2 h −1 with a water flux recovery ratio of more than 95 % when separating various surfactant-stabilized oil-in-water emulsions. Moreover, after three-cycle filtration experiment, the water flux recovery ratio maintained above 90 %. Our study may provide a facile method to construct heterogeneous antifouling membrane through controlling surface segregation process using commercially available chemicals
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
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Meina Xu,Qi Cheng,Ligang Lin,Jing Yang,Zitian Liu,Xu Yang,Qiying Wang,Fengling Tang,Aishan He,Chunhong Wang,Xiaolan Zhang
Films and surfaces with controlled patterns and features have attracted significant attention due to their widespread engineering applications. In this study, a new strategy based on phase separation-induced surface segregation is proposed. Different molecular chains in a polymer solution moved in different directions. During the segregation process, the molecular chains entangled with each other, hindering each other's migratory behavior, thus forming patterned structure on the surface of the film. Thin films with patterned surface topography were prepared by this method. The results indicate that the surface segregation phenomenon occurs during the film preparation. The surface structure of the films was influenced by the polymer ratio, solution concentration, thickness of the cast film and the solvent volatility. The fabricated films depict ordered topography, containing features with an average diameter of 2.23 μm when the polystyrene/poly(methyl methacrylate) ratio of 6:1, solution concentration of 10%, evaporation temperature of 30 °C, and a cast thickness of 0.1 mm were used. Therefore, based on simple blending combined with surface segregation strategy while optimizing the experimental conditions, patterned films with controlled topology were fabricated with preferred hydrophilic or hydrophobic characteristics. These observations are encouraging for the development of smart engineered surfaces with functional characteristics.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Qingping Xin,Xinghui Zhang,Wei Shao,Hong Li,Yuzhong Zhang
The purification of sulfur dioxide (SO 2 ) from the flue gas is an urgent problem given its toxicity to humans and organisms and attendant environmental concerns. In this study, aiming at the separation of SO 2 , mixed matrix membranes (MMMs) are fabricated by incorporating covalent organic framework (COF) into Pebax 1657 polymer matrix . By strengthening the solubility-diffusion mechanism of SO 2 gas molecules, SO 2 /N 2 gas separation performance is investigated. Firstly, MMMs are fabricated by incorporating a porous framework material (TpPa-1) containing SO 2 affinity groups into the Pebax 1657 matrix as a filler. Then the azo group (Azo) is introduced into the MMMs by the method of physical blending. The MMMs with light-responsive characteristic are fabricated by introducing TpPa-1 blended with pAAB into the Pebax 1657 polymer matrix. Secondly, the SO 2 /N 2 separation performance of Pebax/TpPa-1 MMMs is improved with the increasing of filler loading. Specially, the Pebax/TpPa-1 membrane with 5 wt% exhibits the most excellent SO 2 /N 2 separation performance with SO 2 permeability of 1709 Barrer and SO 2 /N 2 selectivity of 811. The MMMs overcome the trade-off effect and achieve enhancement of SO 2 permeability and SO 2 /N 2 selectivity simultaneously. Thirdly, both the SO 2 permeabilities and SO 2 /N 2 selectivities of Pebax/pAAB@TpPa-1-5% membrane exhibit regular and reversible changes under UV–Vis light-conversion conditions, indicating that MMMs containing Azo possesses dynamic light-responsive properties. Furthermore, TpPa-1 and pAAB repel each other in the membrane because both have negative charges, resulting in the forced surface segregation of COF in the Pebax/pAAB@TpPa-1 MMMs.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 2
·583-591
·
IF 8.867
Hao Yang,Hong Wu,Zhaoquan Yao,Benbing Shi,Ziang Xu,Xuanxuan Cheng,Fusheng Pan,Guanhua Liu,Zhongyi Jiang,Xingzhong Cao
Natural materials are often arranged in intricate gradient architectures to implement specific functionalities. Implanting such an exquisite prototype into synthetic membranes remains a grand challenge in real-world applications. In this study, functionally graded membranes are fabricated through a surface segregation method using 2D nanoporous COF TpHZ and poly(ether sulfone) as composite building blocks. During the membrane formation, the COF nanosheets can spontaneously migrate from the membrane bulk to the membrane surface to form a gradient distribution, which can be varied by manipulating the COF addition content and phase inversion temperature. The highest COF content on the membrane surface can be up to 50.90 vol%. Due to the formation of a graded structure, the membranes are endowed with remarkably increased hydrophilicity and free volume characteristics. Accordingly, the optimized membrane exhibits a permeation flux of 2.48 kg m−2 h−1 and a high separation factor of 1430, and remains robust during a stability test for 320 h, and is one of the most efficient mixed matrix membranes for water/ethanol separation. The separation factor is two orders of magnitude more than that of existing commercial membranes. The concept of functionally graded membranes can be applicable to the development of a broad range of high-performance materials.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Mengying Long,Kun Chen,Niaz Ali Khan,Luhui Yang,Yuxiang Liu,Dongmin An,Hongli Liu
The development of highly efficient, cost-effective, and multifunctional ultrafiltration membranes remains a key goal in oil-water separation technology. This study presents a simple yet effective one-step surface segregation approach to fabricate oil-water separation membranes with both antifouling and flame-retardant properties. These features are critical for enhancing membrane performance, as severe fouling is a major challenge in membrane-based separations, and flame retardancy is essential for the separation of combustible oils and the safe storage of flammable polymer membranes. In this approach, SbCl 3 and PVP were dissolved in the casting solution, while tannic acid (TA) was dissolved in the coagulation bath. During the non-solvent-induced phase separation (NIPS) processes, SbCl 3 hydrolyzed into the Sb₄O₅Cl₁₂and then reacted with TA in formation of the metal-polyphenol coordination to generate the clusters. Simultaneously, PVP spontaneously migrated toward the water phase and bonded with TA via hydrogen interactions. The resulting membrane exhibited outstanding performance, achieving a 94 % permeability recovery rate when separating emulsified oil-water mixtures, excellent self-cleaning performance against oil droplets, and flame resistance when exposed to an open flame. This straightforward and efficient one-step approach offers a promising pathway for the development of advanced multifunctional membranes for oil-water separation applications.
研究领域:
材料科学
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化学工程
·
膜技术
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环境工程
·
高分子科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Fei Wang,Mingrui He,Kang Gao,Yanlei Su,Runnan Zhang,Yanan Liu,Jianliang Shen,Zhongyi Jiang,Roni Kasher
Membrane fouling is a common bottleneck in the treatment of wastewater, seawater or brackish water containing bacteria and other living microorganisms. Simultaneously introducing passive antifouling strategies (fouling resistance and fouling release) and active antibacterial strategies (off-surface antibacterial and on-surface antibacterial) onto membrane surfaces seems a promising strategy. In the present study, we designed a new type of organic-inorganic composite modifier comprising organic polymer PHFBM-PMAA-PMTAC (poly [hexafluorobutyl methacrylate]-poly [methacrylic acid]-poly [(2-(methacryloyloxy) ethyl) trimethyl ammonium chloride]) and inorganic Ag nanoparticles (NPs) to introduce the active-passive integrated antifouling strategies through synergistic surface segregation. We found that the Ag NPs could promote the surface segregation of copolymer and in turn copolymer would promote the bulk dispersion of Ag NPs. The resulting membranes exhibited superior and persistent antifouling properties as well as antibacterial properties. In the separation of oil-in-water emulsion and yeast suspension, the flux decline of the membranes was merely 4.0%, while the flux recovery ratio was nearly 100%. Meanwhile, the membranes exhibited desired off-surface and on-surface antibacterial properties, in which the antibacterial efficiency for Escherichia coli was nearly 100% and the width of inhibition zone was 4 mm.
研究领域:
材料科学
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环境工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2014
·
IF 3.96
Guoqing Wang,Lan Yang,Zhe Chen,Wanmin Ruan,Jianli Wang,Baoku Zhu
An amphiphilic terpolymer P(MMA-BA-PEOM) was synthesized by free radical polymerization and used as the macromolecular additive in the preparation of PVDF blend membranes. The glass transition temperature (T g ) of terpolymers was controlled with a wide range from − 6 to 40 °C by adjusting the feed ratio of rigid monomer MMA to soft monomer BA . The increase of static contact angle of copolymer with PBA content indicated that softer chain can facilitate the hydrophobic parts of the additive segregation to the surface of a polymer film at the solid–air interface. The observation of morphology of the extracted PVDF blend membrane verified that P(MMA-BA-PEOM) could facilitate the surface segregation. Filtration experiment showed that PVDF membrane modified by terpolymer P(MMA-BA-PEOM) has a higher pure water flux (365 L m − 2 h − 1 ) and relative flux recovery (71%) than that modified by bipolymer P(MMA-co-POEM).
研究领域:
材料科学
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mengying Long,Luhui Yang,Niaz Ali Khan,Chao Yang,Guangwei He,Tao Wu,Dongmin An,Zhongyi Jiang
Covalent organic frameworks (COFs) offer great potential as membrane materials due to their periodic nanopore structure, high porosity, and extensive chemical tunability. However, directly processing crystallized COFs into membranes presents great challenges. To overcome these issues, alternative routes such as polymer blending during membrane formation and their subsequent crystallization offer promising avenues to harness their advantages. In this work, we decoupled the membrane formation and crystallization of COFs processes and introduced a reactive surface segregation method to fabricate COF-based mixed matrix membranes (MMMs). The amine and aldehyde monomers quickly formed an amorphous network at the solvent/non-solvent interface, while polymer matrix separated from the liquid phase to construct membranes during the non-solvent induced phase separation (NIPS) processes. Subsequently, the prepared membranes were heated in acetic acid solution to in-situ crystalize the COF fillers in the MMMs. The peaks at 8.33° and 12.4° assigned to the (110) and (120) reflection planes in the XRD spectrum indicated that the amorphous network was in-situ crystallized. The optimized membrane exhibited a water permeance of 203 L m −2 h −1 bar −1 , over 98.5 % of rejection rates for dyes, and long-term stability for 720 h. This approach creates a new pathway to prepare the advanced COF-based membranes and represents a significant leap forward in the field of membrane technology.
研究领域:
材料科学
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化学工程
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膜技术
✓ 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）