SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Pengfei Chen,Yunfei Qu,Lida Meng,Lei Jiao,Jiancong Lu,Jianguo Lu
A novel aromatic polyesteramide-based membrane with high free volume for water desalination was prepared by adding a rigid cardo-contorted biphenol monomer to the aqueous phase solution of m-phenylenediamine (MPD) and then carrying out the interfacial polymerization. Compared with the polyamide (PA) membrane, the polyesteramide membrane with high free volume and ultrathin separating layer exhibited 250% increase in flux and 1.2% loss in salt rejection. Moreover, acid and alkali stabilities of polyesteramide membranes were studied by immersing the polyesteramide membranes into acid, aid/ethyl alcohol (EA), alkali and alkali/EA aqueous solutions. After acid/alkali treatments, the surface contact angles of acid/alkali-treated PA/9,9-bis(4-hydroxyphenyl)fluorine (PA/BHPF) membranes were much smaller than the pristine PA/BHPF membrane. With EA, both the acid/EA-treated and alkali/EA-treated polyesteramide membranes exhibited a significant increase in water flux; moreover, the acid/EA-treated membranes showed a simultaneous increase in water flux and salt rejection within a treatment time of 24 h, due to the increase in hydrophilicity and the partial dissolution of small polymer fragments on membrane surface.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Xinming Du,Hongyu Zhang,Yongjiang Yuan,Zhe Wang,Jingmei Xu
High ionic conductivity and excellent alkaline stability are very important for solid electrolyte . Therefore, spindle-shaped anion exchange membranes (AEMs) based on poly (arylene ether ketone) and 1-Bromo-N,N,N-trimethylhexane-6-aminium bromide (Br-QA) have been prepared. The obtained Br-QA can be grafted with poly (arylene ether ketone) main chains to form micro-phase separation structure enhancing the ionic conductivity . Especially, the grafting quaternary ammonium (QA) cation groups are separated by alkyl bromine endows the AEMs with alkaline stability features. Simultaneously, the OH − conductivity of the QA-PAEK-0.6 obtained membranes is 0.046 S/cm under fully hydrated conditions at 60 °C. After immersing into 1 M NaOH alkaline solution for 15 days at 60 °C, the anionic conductivity still high to 0.03 S/cm. Meanwhile, the poly (arylene ether ketone) backbones provide excellent mechanical properties and the Br-QA cation groups also possess good thermal stability , which satisfy the requirement of wide applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Qian Yang,Ling Li,Xue Lang Gao,Hong Yue Wu,Fang Hua Liu,Qiu Gen Zhang,Ai Mei Zhu,Chun Hui Zhao,Qing Lin Liu
A series of highly alkaline durable crosslinked anion exchange membranes (AEMs) is prepared via elimination reaction using a sodium salt of 4,4′(5′)-di(hydroxybenzo)-18-crown-6 as the crosslinker, and quaternary ammonium (QA) as the cation group. The ionic conductivity , ionic exchange capacity (IEC) and mechanical property of the AEMs are investigated. The highest ionic conductivity (about 117 mS cm −1 ) of the PPO-CE 0.10 -QA 0.90 membranes is obtained at 80 °C and 100% relative humidity. The alkaline stability of the AEMs is determined by inspecting the decline in ionic conductivity, mechanical property and the change in chemical structure after the alkaline stability test. The ionic conductivity has only a 6.0% decrease, the tensile strength has an 11.8 MPa reduction and the elongation at break has a 2.7% depression after 480 h test in 2 M KOH at 80 °C. 13 C NMR spectra confirm a negligible change in chemical structure of the AEMs after the alkaline resistance test. The peak power density (about 195 mW cm −2 ) is achieved under a current density of 350 mA cm −2 at 80 °C. Additionally, the AEMs with a novel crosslinked structure decompose above 230 °C and exhibit decent thermal stability.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Chuan Long,Tuo Zhao,Lin Tian,Qiao Liu,Fanghui Wang,Zhihua Wang,Hong Zhu
In order to develop a high-performance and long-term stable anion exchange membrane (AEM), ether-bond-free poly(biphenyl bromohexyl indole) (PPHIN) was prepared and explored as a highly alkaline stable polymer backbone. Combining two alkyl chain modification strategies, a series of flexible double-cationic side chains with different lengths of extender chains were grafted onto the PPHIN backbone to improve the hydrophilic/hydrophobic microphase separation, ionic conductivity, and alkaline stability of the AEM. The resulting PPHIN-N1C possessed a high hydroxide conductivity of 136 mS/cm at 80 °C due to the well-developed microphase separation. Furthermore, the PPHIN-N8C with a long extender chain exhibited high ionic conductivity (103 mS/cm), a low swelling ratio, and excellent alkaline stability. The ionic conductivity of PPHIN-N8C only decreased by 13% after soaking in 2 M NaOH at 80 °C for 1000 h, which was attributed to the steric hindrance of the extender hydrophobic alkyl chain. The single cell using the PPHIN-N8C membrane has a maximum peak power density of 216 mW/cm2 at a current density of 472 mA/cm2 at 80 °C. The results suggest that this type of PPHIN-based AEM is promising in anion exchange membrane fuel cell application.
研究领域:
材料科学
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化学工程
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能源科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Chen Xiao Lin,Hong Yue Wu,Ling Li,Xiu Qin Wang,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To achieve highly conductive and stable anion exchange membranes (AEMs) for fuel cells, novel triblock copolymer AEMs bearing flexible side chain were synthesized. The triblock structure and flexible side chain are responsible for the developed hydrophilic/hydrophobic phase separated morphology and well-connected ion conducting channels, as confirmed by transmission electron microscopy. As a result, the triblock copolymer AEMs with flexible side chain (ABA–TQA-x) demonstrated considerably higher conductivities, up to 130.5 mS cm–1 at 80 °C, than the AEMs with monocation side chain (ABA–MQA). Furthermore, the long alkyl spacer between the backbone and quaternary ammonium groups, as well as long intercation spacer limits the water swelling of the membranes to some degree, resulting in good alkaline stability. The ABA–TQA-44 membrane retained 84.7% and 83.1% of its original conductivity and ionic exchange capacity, respectively, after immersed in a 1 M aqueous KOH solution at 80 °C for 480 h. Furthermore, the peak power density of a H2/O2 single cell using ABA–TQA-44 is 204.6 mW cm–2 at a current density of 500 mA cm–2 at 80 °C.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
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2024
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IF 1.6
Qinzhou Cai,Huifang Zhang,Bingshan Zhao,Lei Ren,Yonghua Wang,Fanghua Wang
Cold-adapted, alkali-stable lipases with surfactant tolerance are highly sought after in the detergent industry. In this study, we recombinantly expressed and characterized a novel lipase from Marinobacter nanhaiticus (MNL). The purified MNL exhibited high stability within a temperature range of 10–30°C and pH values of 8–10, demonstrating optimal activity at 20°C and pH 8. MNL has a preference for substrates with medium chains with the best activity being 3768.6 U/mg using p -nitrophenyl decanoate as a substrate. Remarkably, MNL showed enhanced enzymatic activity in the presence of ionic surfactants and displayed notable resilience when exposed to proteases. Washing performance analysis further revealed MNL's high proficiency in removing oil-based stains from fabrics. Collectively, these results suggest that MNL holds significant promise as a valuable component in laundry detergent formulations.
研究领域:
生物化学
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工业微生物学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Chenxiao Lin,Jixia Wang,Guohong Shen,Junfei Duan,Dong Xie,Faliang Cheng,Yan Zhang,Shiguo Zhang
In order to develop anion exchange membranes (AEMs) with high ionic conductivity , low swelling ratio (SR) and long-term alkaline stability, a series of crosslinked polybenzimidazole-based AEMs (FPBI-QPVC x ) were prepared. We herein demonstrated that the integration of a partially fluorinated polybenzimidazole and quaternized poly(vinylbenzyl chloride) benefits the fabrication of the AEMs with well-defined hydrophilic/hydrophobic phase-segregated structure, leading to a relative high hydroxide conductivity of 91.7 mS cm −1 at 80 °C for FPBI-QPVC 2.5 . The existence of a crosslinking structure endowed the as-prepared AEMs with relatively low water uptake and SR. Besides, the FPBI-QPVC x AEMs also have robust mechanical properties , high thermal decomposition temperature and good alkaline stability. Only 10.7% of conductivity loss was observed after soaking the ether-bond-free AEMs into 1 M a.q. KOH at 80 °C for 480 h. A maximum power density of 197.5 mW cm −2 was determined by a single cell using FPBI-QPVC 2.5 AEM.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Chuanrui Lu,Chuan Long,Yunxi Li,Ziming Li,Hong Zhu
Poly(arylene piperidine)s (PAPs) backbones, which do not contain unstable ether bonds, was synthesized by one-pot, metal-free superacid-catalyzed polymerization for anion exchange membranes (AEMs) preparation. Meta-terphenyl as a monomer of polymer to regulate the morphology and properties of AEM was also used due to its spatially torsional configuration instead of the recently reported linear structure of peta-terphenyl. Long flexible hydrophilic chains were grafted onto poly(meta terphenyl piperidinium) (m-PTP) backbone to form four cationic functionalized side chains, promoting efficient transfer of OH − and optimizing the hydrophilic/hydrophobic microphase separation structure. The resulting AEM shows a high ion conductivity of 164 mS/cm (m-PTP-TFPE-21) at 80 °C. Furthermore, stable piperidine cation and long alkyl spacer chain contributed to the excellent alkali stability of m-PTP-TFPE-TQA membrane which shows only 11.67% and 12.73% degradation in ion conductivity and IEC, respectively, after soaking in 2 M NaOH at 80 °C for 1500 h. The peak power density of the H 2 /O 2 single cell using m-PTP-TFPE-14 is 269 mW/cm 2 at a current density of 540 mA/cm 2 at 80 °C.
研究领域:
化学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 39
·19960-19968
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IF 7.443
Zhenxing Wang,Jing Guo,Jun Ma,Lu Shao
Most recently, polydopamine (PDA) and its hybrid nanomaterials have been developed as promising adsorbents to remove organic dyes. However, PDA-based adsorbents are typically limited by a poor alkali resistance, lack of selective adsorption capacity and unsatisfactory recyclability. Herein, novel PDA-based magnetic nanoparticles are fabricated for the first time via the simultaneous incorporation of PDA and poly(ethylenimine) (PEI) on Fe3O4 nanoparticles simply in one step to overcome almost all the disadvantages of “traditional” PDA adsorbents. The constructed PDA-based magnetic nanoparticles have an ultrathin shell layer (only about 3 nm, much thinner than that of other PDA adsorbents) and can withstand strong alkaline solutions (0.1 M NaOH, pH = 13), exhibiting an excellent alkali resistance. Remarkably, the nanoparticles show superior performance in smart and fast selective removal (>95% in just five minutes) of anionic dyes from dye mixtures and can maintain their high efficiency (>90%) even after 10 cycles, indicating the unprecedented selective adsorption capacity and the desirable recyclability. The adsorption process follows pseudo-second order reaction kinetics, as well as the Langmuir isotherm, indicating that anionic dyes are monolayer adsorbed on the hybrid by electrostatic interaction. In particular, the facile regeneration of the novel composite nanoparticles can be accomplished within only several minutes, demonstrating an excellent regeneration ability. Our study can provide new insights into utilizing mussel-inspired materials for environmental remediation and creating advanced magnetic materials for various promising applications.
研究领域:
环境科学
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材料科学
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生物仿生学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
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IF 6.035
Chen Xiao Lin,Xiu Qin Wang,En Ning Hu,Qian Yang,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Alkaline stability is the critical issue for the practical application of anion exchange membranes (AEMs) in fuel cells. The benzyltrimethyl ammonium and backbone with C-O linkages of the traditional AEMs are susceptible to attack by hydroxide ions resulting in poor alkaline stability of the AEMs. Herein, we present the preparation of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) triblock copolymer via grafting, ketone reduction and quaternization for AEM fuel cell applications . The quaternary ammonium (QA) groups are attached to the SEBS backbone free of C-O linkages via long flexible alkyl spacers, which are responsible for the robust alkaline stability of the AEMs. Thus, the hydroxide conductivity of SEBS-CH 2 -QA-1.5 was only decreased by 7.7% and 13.7% after immersing the membranes into a 1 M aqueous KOH solution at 60 and 90 °C for 360 h, respectively. Furthermore, SEBS-CH 2 -QA-1.5 with IEC of 1.23 meq g −1 exhibits a maximum hydroxide conductivity of 56.4 mS cm −1 at 80 °C and a maximum power density of 94.6 mW cm −2 under a current density of 300 mA cm −2 .
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Song Wang,Zhe Wang,Jingmei Xu,Qian Liu,Zhiyan Sui,Xinming Du,Yinghe Cui,Yongjiang Yuan,Junjian Yu,Yan Wang,Yifang Chang
A bead-on-string electrospinning strategy is proposed to solve the dilemma of unstable conduction channel while improving the OH − conductivity of anion exchange membranes (AEMs). Here, poly (aryl ether ketone)-based AEMs are synthesized via N-spirocyclic quaternary ammonium modification, and then processed by electrospinning and sparingly soluble techniques. N-spirocyclic cations are induced to orient during electrospinning, as evidenced by the long-range ordered aggregation of ion clusters through EDX . Therefore, the electrospun membrane exhibits significantly higher conductivity (74 mS cm −1 at 80 °C) and alkaline stability, the conductivity remains above 97% after being kept in a solution of 2 mol/L KOH at 80 °C for 720 h. The swelling of the beaded membrane is only 12%, and the tensile strength is about 24.9 MPa. This work provides a simple and effective method to densify nanofiber mats.
研究领域:
材料科学
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能源工程
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Wei Wei Gou,Wei Ting Gao,Xue Lang Gao,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To prepare anion exchange membranes (AEMs) that possess an excellent alkaline resistance, a competitive conductivity and a low swelling ratio (SR), a reasonable molecular structure design is particularly important. Herein, we synthesized ether-free fluoropolymers via a superacid catalyzed polyhydroxyalkylation reaction in one pot, and grafted long flexible multipiperidine cation side chains to different positions of the backbone through Menshutkin reaction. We investigated the effect of hydrophilic-hydrophobic polarity difference on the microphase separation . When the ionic liquid is grafted closer to the fluorine-contained group, AEMs exhibit a more obvious microphase separated structure and larger ion clusters as confirmed by morphology observation. Molecular dynamics simulations also confirmed that the construction of ion channels in PBPip-QAPBF-30% is more efficient than in QAPBPip-PBF-30%. The resulting PBPip-QAPBF-30% AEM exhibits the highest OH − conductivity of 156.4 mS cm −1 with a low SR of 12.9% at 80 °C. The QAPBPip-PBF-30% and PBPip-QAPBF-30% AEMs both show an excellent alkaline stability with the OH − conductivity retention of 93.2% and 95.0% correspondingly after being treated in a 2 M NaOH solution at 80 °C for 1080 h. Moreover, the peak power density of a single cell equipped with PBPip-QAPBF-30% reaches 324.5 mW cm −2 at a current density of 550 mA cm −2 .
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
危险品化学品经营许可证（带存储）