Polymer Chemistry
·
2022
·Vol. 13
·期 30
·4395-4405
·
IF 5.364
Shenghua Du,Shuai Huang,Ning Xie,Tong Zhang,Yaoyao Xu,Xingming Ning,Pei Chen,Xinbing Chen,Zhongwei An
One kind of promising anion exchange membrane (AEM) bPES(x/y)-Q based on block poly(ether sulfone)s with a rigid side-chain and high-density annular quaternary ammonium groups has been developed. Characteristically, the AEMs have high conductivities (62.3–98.7 mS cm−1) at low IECs (0.9–1.5 mequiv. g−1) due to their excellent microphase separation resulting from block copolymer structures, rigid side-chains and high-density ion moieties. Meanwhile, the AEMs have relatively good alkaline stability and oxidative stability because of their special chemical structures. Further investigation reveals that the AEMs show potential application in anion exchange membrane fuel cells, where the bPES(5/20)-MPy based single fuel cell shows the maximum power density of 164 mW cm−2.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lili Dong,Yan Li,Xinli Wen,Mingfeng Zhao,Le Zhang,Mengmeng Zhu,Shunli Wan
To overcome application limitation of the available biochar-based metallic oxide composites for the removal of anionic pollutants like phosphate, a new strategy was proposed that metallic oxide was anchored in the positively charged biochar, acquired by introducing high-density quaternary ammonium groups. The resultant nanocomposite adsorbent Fe@N-BC exhibited high adsorption speed, capacity and preference to phosphate. In the existence of competing anion Cl - at higher levels, Fe@N-BC possessed 3–5 times greater working adsorption capacity of phosphate than a commercial phosphate adsorbent D201 and the mixture of ferric oxide and N-BC with the same proportion as the composite. Fixed-bed adsorption runs of Fe@N-BC could treat ∼ 194 bed volumes (BV) of a synthetic phosphate-polluted wastewater before breakthrough achieving (<0.1 mg P/L in effluent), about 7.46 times greater than that of D-201. The saturated Fe@N-BC could be thoroughly regenerated with 10 % NaOH solution for repeated use with negligible loss of adsorption capacity and ferric. The specific inner-sphere complexation between phosphate and the immobilized ferric oxide was proven to the dominant pathway for preferable adsorption of phosphate onto Fe@N-BC. The obviously enhanced removal of phosphate by Fe@N-BC was ascribed to the introduced quaternary ammonium groups in N-BC, which triggered the dispersion of the impregnated ferric oxide nanoparticles (with sizes of 8.8 ± 1.0 nm) and Donnan member effect. Besides, Fe@N-BC was preliminarily proven to have no biotoxicity. This study can shed new light on how to expand the application of the traditional biochar-based composites to the decontamination of anionic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 14
·7975-7983
·
IF 3.049
Dan Yao,Tonghui Wei,Lichao Shang,Hui Na,Chengji Zhao
Anion exchange membranes based on side-chain-type quarternized poly(ether ether ketone)s (QPEEKs), containing different hetero-cycloaliphatic quaternary ammonium groups, were prepared via a multi-step procedure, including polycondensation with a monomer containing pendant methylphenyl groups, bromomethylation, and followed by quaternization with 1-methylpyrrolidine (MPY), 1-methylpiperidine (MPRD), 1-methylimidazole (MIDZ) and N-methyl morpholine (MMPH), respectively. The properties of these membranes were then compared with the properties of conventional quarternized poly(ether ether ketone)s containing benzyltrimethylammonium (QPEEK-TMA). Model compounds, QMPY, QMPRD, QMIDZ and QMMPH, were synthesized and used to quantitatively compare the alkaline stability of hetero-cycloaliphatic quaternary ammonium groups using 1H NMR. The results of this study indicated that the alkaline stability of all these model compounds is in the order of QMPY > QMPRD > QTMA > QMIDZ > QMMPH. These QPEEKs membranes display superior thermal, dimensional and mechanical stability. QPEEK-TMA, QPEEK-MPY and QPEEK-MPRD exhibit higher hydroxide conductivities and lower activation energies than QPEEK-MIDZ and QPEEK-MMPH. Furthermore, after exposure to 1 M NaOH at 60 °C for 24 days, QPEEK-MPY and QPEEK-MPRD demonstrated a loss in hydroxide conductivity of 28.5% and 33.4%, respectively. Both values were lower than that of QPEEK-TMA (37.7%). Therefore, among these side-chain-type QPEEKs membranes, QPEEK-MPY and QPEEK-MPRD, containing benzylmethylpyrrolidinium and benzylmethylpiperidinium as cation head-groups, are promising AEM materials for fuel cell construction.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Kunzhi Shen,Jinhui Pang,Sinan Feng,Yang Wang,Zhenhua Jiang
The poly(aryl ether ketone)s containing two quaternary ammonium groups on pendant phenyls are obtained via a bromination reaction following a quaternization process. Poly(aryl ether ketone)s with two methyl groups on pendant phenyls, which can be converted to bromomethyl groups by a radical reaction, are synthesized. Cationic quaternized poly(aryl ether ketone)s result from conversion of the bromomethyl groups to ionic moieties by quaternization with trimethylamine in the shape of clear, creasable films. The highest conductivity 0.0307 S cm −1 is achieved by the QMPAEK-75 membrane with ion exchange capacity of 1.35 meq. g −1 at 80 °C. Meanwhile, these anion exchange membranes also have good mechanical properties , very low methanol permeability, high thermal stability, chemical stability and dimensional stability, which play important roles in the preparation of direct methanol fuel cells.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Weixiang Liu,Yukun Qin,Song Liu,Ronge Xing,Huahua Yu,Xiaolin Chen,Kecheng Li,Pengcheng Li
A novel type of water soluble chitosan derivatives (TQCSPX) were synthesized including 3-aminopyridine (TQCSP1) and 3-Amino-4-methylpyridine (TQCSP2). The theoretical structures of TQCSPX were calculated by Gaussian 09 and confirmed by FT-IR, 1 H NMR, 13 C NMR, elemental analysis and XRD. The antifungal properties of TQCSPX against Phytophthora capsici ( P. capsici ), Rhizoctonia solani ( R. solani ), Fusarium oxysporum ( F. oxysporum ) and Fusarium solani ( F. solani ) were evaluated at concentrations ranging from 0.2 mg/mL to 0.8 mg/mL. Antifungal results indicated that the derivatives have significantly enhanced antifungal activity after quaternized compared with the original chitosan (CS). Moreover, TQCSP1 inhibited the growth of P. capsici with inhibitory indices of 91.94% at 0.8 mg/mL. The experimental results demonstrated that the increasing number of the positive charge would improve the antifungal efficiency of chitosan, which may provide a novel direction for the development of fungicides.
研究领域:
生物化学
·
植物病理学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 49
·30770-30783
·
IF 3.108
Qian Shi,Pei Chen,Jinfang Zhou,Qiang Weng,Xueliang Zhang,Xinbing Chen,Zhongwei An
A new difluoro aromatic ketone monomer, (2,6-difluorophenyl)[3,5-bis[(3,5-dimethylphenyl)methyl]phenyl]methanone, is developed to prepare a series of poly(arylene ether sulfone)s (PAES) bearing two pendant 3,5-dimethylphenyl groups via polycondensation reaction. The desired side-chain type PAESs containing multiple benzyl quaternary ammonium groups (QPAES(x/y)) are obtained by the corresponding bromomethylation and subsequent quaternization. Their properties, such as hydroxide conductivity, dimensional change, water uptake and alkaline stability, are investigated. Side-chain type membranes QPAES(x/y) with ion exchange capacities (IECs) of 0.96–1.22 mequiv. g−1 display anisotropic membrane swelling and hydroxide conductivity of 39.9–49.8 mS cm−1 at 80 °C. The greater length and dense distribution of the benzyl-type quaternary ammonium pendants are probably responsible for the good hydroxide conductivity and alkaline stability. Meanwhile, the corresponding crosslinked membrane (CQPAES(1/4)) shows higher conductivity, lower membrane swelling, better oxidative stability and higher chemical stability in hot alkali solution (80 °C) than the uncrosslinked one with a comparable IEC value.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xiu Qin Wang,Chen Xiao Lin,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Facile synthesis of poly (ether sulfone)-based anion exchange membranes (AEMs) bearing flexible pendent quaternary ammonium (QA) groups for fuel cells is reported. (2,3-Epoxypropyl) trimethyl ammonium chloride (EPTMAC) is directly grafted onto the hydroxyl-bearing poly (ether sulfone) (PES) backbone via one-step ring-opening reaction to introduce ion conductive moieties. This scheme is more straightforward than the conventional two-step functionalization approach via chloromethylation or radical-initiated bromination and Menshutkin reactions . This method can be used to control the degree of functionalization of QA-containing PES easily. 2D nuclear overhauser effect spectroscopy (NOESY) shows that QA groups aggregate and self-assemble in the functionalized-PES solutions which are in favor of fabricating a membrane with phase separation morphology, as well as confirmed by small angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and atomic force microscopy (AFM). These resulting AEMs exhibit reasonable hydroxide conductivity, low water uptake, high power density, and desirable durability in a single fuel cell. This suggests that they are good candidates for fuel cells.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Pengfei Huo,Shuling Zhang,Xingrui Zhang,Zhi Geng,Jiashuang Luan,Guibin Wang
A series of poly(aryl ether sulfone) copolymers containing quaternary ammonium moieties were obtained by polymerization of methylated copolymers, followed by bromination and derivatization with quaternary-ammonium groups. The copolymer membranes exhibited excellent thermal stability and mechanical properties . Symmetric supercapacitor single cells based on activated carbon and quaternary ammonium functionalized poly(aryl ether sulfone) membranes were fabricated into a three-layer structure: activated carbon electrode//quaternary ammonium functionalized poly(aryl ether sulfone) separator//activated carbon electrode and characterized by cyclic voltammetry , galvanostatic charge–discharge and electrochemical impedance spectroscopy in 6 M KOH aqueous solution. The coulombic efficiency of the supercapacitor was as high as 95% over 5000 cycles. The effect of different degree of quaternization of PAES copolymer separators on thermal and mechanical properties of separators and performance of the symmetric supercapacitor single cells were investigated.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 36
·13938-13948
·
IF 8.262
Chen Xiao Lin,Xiao Ling Huang,Dong Guo,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
To realize high performance anion exchange membranes (AEMs) for alkaline fuel cells (AFCs), a series of quaternized poly(ether sulfone)s (PESs) with different lengths of flexible spacers linking cationic groups and the backbone was synthesized via nucleophilic polycondensation, demethylation and Williamson reactions. Atomic force microscopy (AFM) phase images show clear hydrophilic/hydrophobic phase separation for all the side-chain-type AEMs. The PES-n-QA membrane with hexyleneoxy spacers (n = 6) between the cationic groups and backbone (benzene ring) exhibited the maximum conductivity of 62.7 mS cm−1 (IEC = 1.48 meq. g−1) at 80 °C. The AEM materials are found to have an improved long-term alkaline stability by extending the length of the flexible spacer (n ≥ 4). The PES-12-QA membrane with a flexible dodeceneoxy spacer demonstrated the highest alkaline stability, where the conductivity and IEC only decreased by 8.1% and 6.9% after immersing in a 1 M aqueous KOH solution at 60 °C for 720 h. Furthermore, the single fuel cell performance test using PES-6-QA as an AEM showed a maximum power density of 108.3 mW cm−2 at a current density of 250 mA cm−2 at 60 °C.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xindi He,Kairuo Zhu,Ziying Jiang,Yang Yu,Sai Zhang,Xiaoling Dong,Ling-Ping Xiao,Shangru Zhai
Herein, an emerging vertically oriented alginate aerogel composites (QLHC@A aerogel) was constructed by combining the mild ionic crosslinking technique with directed freeze-casting to achieve adsorptive removal of ReO 4 − (the chemical analogue of TcO 4 − ). The lignin hydrochar in aerogel composites served as a bridge connecting quaternary ammonium groups to fabricate functional addition, among the PDDA-modified lignin hydrochar investigated, QLHC 100 exhibited the best adsorption performance, up to 212.95 mg/g, while the regular lamellar structure and good hydrophilic property of alginate-based aerogel allowed rapid diffusion of ReO 4 − anion in water. When the usage amount of QLHC 100 powder became 0.8 g, the optimal ReO 4 − removal efficiency of QLHC@A aerogel reached 188.90 mg/g at pH 4, 0.1 g/L and 303 K. Batch adsorption experiments also validate that the ReO 4 − adsorption process was mightily pH-dependent behavior, and adsorption behavior fitted both the pseudo-second-order kinetic model and the Langmuir isothermal model well. Meanwhile, QLHC@A aerogel had a high adsorption selectivity, excellent chemical tolerance, and good reuse performance. Based on various characterization techniques and DFT calculation result, the adsorption mechanism of ReO 4 − on QLHC@A aerogel is mainly dominated by electrostatic adsorption and strong affinity between quaternary ammonium groups and ReO 4 − . Significantly, this strategy can be expanded to include high-performance aerogel composites for the remediation of nuclear effluent contaminated with TcO 4 − .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Shenghua Du,Songsong Li,Ning Xie,Yaoyao Xu,Qiang Weng,Xingming Ning,Pei Chen,Xinbing Chen,Zhongwei An
A variety of poly (ether sulfone)s based anion exchange membranes (AEMs) rPES(x/y)-Q with high-density heterocyclic quaternary ammonium groups is prepared by a polycondensation of novel difluoro monomer with biphenol and bis(4-fluorophenyl) sulfone . The AEMs rPES(x/y)-Q exhibit low IEC values in the range of 0.82–1.33 mequiv. g −1 but relatively high hydroxide conductivity of 54.1–82.3 mS cm −1 at 80 °C. Moreover, the AEMs rPES(x/y)-Q display affordable water uptake and good stability due to their rigid side-chain, high-density and stable heterocyclic quaternary ammonium cations. Noticeably, the rPES(5/20)-MPy based single fuel cell displays a large maximum power density of 141 mW cm −2 , which reveals a potential application in anion exchange membrane fuel cell.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiao Pang,Ziwen Liu,Shuting Xu,Kexin Lv,Benbing Shi,Xu Dong,Na Xing,Zhong Gao,Shiyi Zhu,Leilang Zhang,Zengguang Yao,Lijuan Cheng,Hui Wang,Kai Xu,Yawei Liu,Hong Wu,Zhongyi Jiang
Proton exchange membranes (PEMs) with high proton conductivity, excellent mechanical strength, and minimal hydrogen crossover are crucial for the practical implementation of electrochemical hydrogen energy conversion devices, including electrochemical hydrogen compression (EHC). Herein, hydrazone-linked ionic covalent organic frameworks (iCOF) bearing quaternary ammonium (QA) groups were synthesized and introduced into the sulfonated poly (ether ether ketone) (SPEEK) matrix to fabricate hybrid PEMs. Among them, the orderly arrangement of QA and –NH- groups on iCOF not only rearranged the distribution of −SO 3 H groups in the SPEEK polymer matrix, increasing the continuity and connectivity of the proton conduction pathways but also formed acid-base pairs with −SO 3 H groups to facilitate proton dissociation. Additionally, the electrostatic and hydrogen bonding interactions formed between iCOF and SPEEK matrix optimized the microphase separation structure and enhanced the mechanical stability of membranes. As a result, the hybrid PEMs exhibited an enhanced proton conductivity of 469.0 mS cm −1 (80 °C, 100 % RH) with only 2 wt% iCOF content, high mechanical strength of 91.3 MPa, and superior EHC performance with a high outlet pressure of 3.31 MPa (30 °C, 100 % RH) and high-purity hydrogen (>99.9 %) from a 40 % hydrogen–nitrogen mixture.
研究领域:
材料科学
·
能源技术
✓ 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）