ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Muhammad Irfan,Liang Ge,Yaoming Wang,Zhengjin Yang,Tongwen Xu
Developing anion exchange membranes that have high anion selectivity and can avoid membrane swelling is a critical, but challenging, target for electrodialysis, which has witnessed great success in a wide range of applications including saline wastewater treatment and resource recovery. We found in this work that by tuning the hydrophobicity of alkyl spacers which connect the positively charged ammonium groups and polymeric backbones of the anion exchange membrane, high anion selectivity, and low membrane swelling of anion exchange membrane can be achieved. The membranes developed here are capable of discriminating monovalent and divalent anions, with a selectivity for Cl–/SO42– reaching up to 13.07, and our results suggest the chain length of the spacers determines the anion selectivity of membrane. We attribute such phenomenon to the change in side chain hydrophobicity. This is a particularly interesting finding that could facilitate the development of advanced anion exchange membranes for electrodialysis.
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 RESEARCH IN CHINESE UNIVERSITIES
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2023
·Vol. 39
·期 2
·187-191
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IF 3.1
Jia Yanhua,Jiang Qinglin,Wang Bohan,Yang Jiaji,Zhang Jiang,Ma Yuguang
Due to their unique physicochemical properties, the anion radical and dianion of perylene diimide derivatives(PDIs) recently attracted significant attention for organic semiconductors. However, the impact of packing structure and the radical content for carrier transport in the solid state still need to be determined. Bringing the electron-withdrawing groups is an effective strategy for enabling π−π stacking distance. Here, bay-tetrachloro-substituted PDI(B-4Cl-PDI) anion radical and dianion films were fabricated quantitatively doped with N 2 H 4 ·H 2 O. The radical contents were quantitatively calculated by absorption spectra in different doping ratios. The X-ray powder diffraction patterns showed that the anion radical presented a crystalline structure, and dianion aggregates exhibited an amorphous structure. With precise manipulation of the radical content, the anion radical aggregates and dianion aggregates showed the maximum electrical conductivity value of 0.024 and 0.0018 S/cm, respectively. The experiment results show that doping level and aggregate structure play a crucial role in electronic transport properties.
研究领域:
有机半导体材料
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物理化学
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Jinfang Zhou,Pei Chen,Qiang Weng,Jianhua Fang,Xinbing Chen,Zhongwei An
Novel phenolate anion-based branched/cross-linked anion exchange membranes (AEMs) are synthesized via the quaterization reaction between poly (arylene ether sulfone) containing side-chain benzyl groups and 2,4,6-Tris(dimethylaminomethyl)phenol. The branched/cross-linked AEMs show much higher performance than the corresponding uncross-linked membrane (Q) because of branched/cross-linked structure and phenolate anion-based antioxidant structure in membrane. Among the branched/cross-linked AEMs, CQ15 with IEC of 1.25 mequiv.g −1 shows a reasonably high hydroxide conductivity of 32 mS cm −1 at 80 °C, low P M of 0.41 × 10 −7 cm 2 s −1 , large φ of 39 × 10 4 Scm −3 s, and display above three times of oxidative stability than Q. Meanwhile, CQ15 exhibits long-term stability against alkali treatment at 60 °C for 216 h with small reduction in hydroxide conductivity by only 16%, and also remains stable in 4 mol L −1 NaOH solution at 80 °C for 132 h with low reduction in hydroxide conductivity by 20%, indicating high potential application for anion exchange membrane fuel cell.
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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高影响因子
DALTON TRANSACTIONS
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2019
·Vol. 48
·期 7
·2300-2307
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IF 4.052
Xiao-Yan Luo,Xiao-Yan Chen,Rong-Xing Qiu,Bao-You Pei,Yi Wei,Min Hu,Jin-Qing Lin,Jing-Yang Zhang,Geng-Geng Luo
In this work, an efficient strategy for improving CO2 capture based on anion-functionalized ionic liquids (ILs) by reducing cation–anion interactions in ILs was reported. The influence of the cationic species on CO2 absorption was investigated using 2-hydroxyl pyridium anions ([2-Op]) as a probe. CO2 capture experiments indicated that the CO2 absorption capacity in [2-Op] anion-based ILs varied from 0.94 to 1.69 mol CO2 per mol IL at 30 °C and 1 atm. Spectroscopic analysis and quantum chemical calculations suggested that the increase of the CO2 absorption capacity may be ascribed to the reduction of the strength of cation–anion interactions in ILs, and stronger cation–anion interactions would make one CO2 site in the [2-Op] anion inactive. Furthermore, the effect of the cation unit on the anion was evidenced by FT-IR spectra, implying that strong interactions between ions may lead to the decrease of the IR absorption wavenumber of hydroxy pyridium and work against CO2 capture. Following this strategy, it was finally found that [Ph-C8eim][2-Op] (Ph-C8eim = 1-N-ethyl-3-N-octyl-2-phenylimidazolium) with weaker cation–anion interactions exhibited a significant increase in the CO2 uptake capacity, and extremely high capacities of 1.69 and 1.83 mol CO2 per mol IL could be achieved at 30 and 20 °C, respectively. The study presented here would be helpful for further designing novel and effective ILs for advancing CO2 capturing performance.
研究领域:
化学工程
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环境科学
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PubMed
高影响因子
Membranes
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2023
·Vol. 13
·期 2
·188
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IF 4.2
Jin Yang,Qian Chen,Noor Ul Afsar,Liang Ge,Tongwen Xu
Poly(alkyl-biphenyl pyridinium)-based anion exchange membranes with alkyl side chains were synthesized for permselective anion separation. By altering the length of the grafted side chain, the hydrophilicity and other attributes of the membranes could be controlled. The QDPAB-C5 membrane with the best comprehensive performance exhibited a Cl−ion flux of 3.72 mol m−2h−1and a Cl−/SO42−permselectivity of 15, which are significantly better than the commercial Neosepta ACS membrane. The QDPAB-C5 membranes with distinct microscopic phase separation structures formed interconnected hydrophilic/hydrophobic ion channels and exhibited excellent ion flux and permselectivity for other anionic systems (NO3−/SO42−, Br−/SO42−, F−/SO42−, NO3−/Cl−, Br−/Cl−, and F−/Cl−) as well. Furthermore, the influence of alkyl side chain length on the membranes’ ion flux and permselectivity in electrodialysis was investigated, which may be attributed to the alterations in ion channels and hydrophobic regions of the membranes. This work provides an effective strategy for the development of monovalent anion permselective membranes.Keywords:anion exchange membrane;monovalent anion permselective membrane;hydrophobicity;electrodialysis;permselectivity
研究领域:
材料科学
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化学工程
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Guangzhe Wang,Jinqiu Yuan,Junhui Zhao,Yafei Li,Runnan Zhang,Jianliang Shen,Xiaoyao Wang,Hong Wu,Ayman El-Gendi,Yanlei Su,Zhongyi Jiang
Porous framework materials hold great promise in tuning the chemical and physical structure of polyamide membranes for efficient nanofiltration . In this work, anionic covalent organic framework (aCOF) with abundant sulfonic acid groups was embedded into polyamide matrix via interfacial polymerization to modulate both membrane charge property and thickness for the removal of divalent ions. Benefiting from the high negative charged density, aCOF not only enhanced the membrane electronegativity from −25.6 mV to −71.5 mV but also slowed down the diffusion rate of piperazine by electrostatic interaction to decrease the membrane thickness from 93 nm to 18 nm. The enhanced electronegativity can intensify the charge exclusion to divalent anions (Na 2 SO 4 rejection above 97%), while the ultrathin structure endows membrane with high water permeance of up to 39 L m −2 h −1 bar −1 , about 2.4 times higher than that of pristine PA membrane. Our membranes provide a new path to rational design and controllable construction of high-performance nanofiltration membranes.
研究领域:
材料科学
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环境工程
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高影响因子
DESALINATION
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2025
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IF 9.8
Renqiang Cao,Feng Duan,Wenyan Ji,Dingshan Ruan,Yang Xu,Shaoyuan Shi,Yuping Li,Hongbin Cao
Anion exchange membrane (AEM) with both antifouling properties and monovalent anion selectivity are crucial to promoting the widespread application of electrodialysis in industrial wastewater resourcing. In this study, interfacial polymerization (IP) modification AEMs with different structures were prepared by regulating the composition of aqueous monomers. Results show that the polyester modified layer with tannic acid (TA) as an aqueous phase monomer is more hydrophilic, and has the best negative charge density. The service life of the IP-modified AEM with TA as an aqueous phase monomer (TA-M) exceeds 200 % of pristine AEM (PM) in actual wastewater testing, and its selective separation efficiency in anion selectivity testing is over 10 times greater than that of PM. These results indicate that TA-M has improved antifouling properties and monovalent anion selectivity. According to in-situ electrochemical impedance spectroscopy results, the IP-modified layer of TA-M can not only avoid an obvious fouling layer formed due to concentration polarization but also attenuate the negative influence of sodium dodecylbenzene sulfonate on transmembrane migration of Cl − , thus improving the antifouling performance of AEM. Moreover, IP-modified layers form a new ion transfer interface during the transmembrane migration of SO 4 2− to enhance the mass-transfer resistance, which determines the monovalent anion selectivity of AEM. This work provides valuable insights for constructing IP-modified layers on the AEM surface and promoting their application in the resourcing treatment of coking wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 11
·6348-6356
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IF 10.733
Yan Zhao,Yi Li,Shushan Yuan,Junyong Zhu,Sofie Houtmeyers,Jian Li,Raf Dewil,Congjie Gao,Bart Van der Bruggen
Separation and extraction of monovalent anions from salt lakes or oceans is very important in view of a sustainable supply of industrial chemical compounds. In this work, a novel anion exchange membrane (AEM) with simultaneously enhanced monovalent anion selectivity and reduced organic fouling properties was synthesized through oxidative self-polymerization and an amide condensation reaction. Using a rapid deposition and polymerization procedure, L-dopa was coated on a commercial AEM surface to form an L-dopa polymer layer (L-PDA) by using CuSO4 and H2O2 as a trigger. This layer was chemically assembled with a 4-amino-benzenesulfonic acid monosodium salt (ABS) via an amide condensation reaction. The resulting anion exchange membrane L-PDA#ABS, with a unique hydrophilic characteristic and negatively charged thin layer, was found to have a high monovalent anion permselectivity of 5.29 (SO42−/Br−) and 4.66 (SO42−/Cl−) in electrodialysis (ED) (10 min, initial concentration of 50 mM Br−, Cl− and SO42−, and current density of 10.00 mA cm−2), while the original AEM had corresponding permselectivities of 1.22 and 1.00. Furthermore, the selective separation efficiency parameter of the L-PDA#ABS AEM in SO42−/Br− and SO42−/Cl− was 66% and 63%, which is higher than those of the original AEM (8% and 2%). Sodium dodecyl benzene sulfonate, bovine serum albumin and humic acid were used as model organic fouling materials; the L-PDA#ABS AEM has a much higher antifouling potential than a commercial reference AEM. The work also demonstrated that the chemically assembled functional layer with high stability was suitable for long term application.
研究领域:
化学工程
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材料科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Baoying Wang,Junying Yan,Huangying Wang,Ruirui Li,Rong Fu,Chenxiao Jiang,Victor Nikonenko,Natalia Pismenskaya,Yaoming Wang,Tongwen Xu
The development of low-resistance ion-exchange membranes enabling fast transport of large-sized metallic anions is extremely desirable for the treatment of metal containing effluents using electrodialysis (ED). Herein, mechanically stable ionic liquid-based pore-filling anion-exchange membranes (PFAEMs) with excellent transport performance for large-sized metallic anions were fabricated by impregnating porous polytetrafluoroethylene with ionic liquid (IL) tricapryl(methyl) ammonium chloride, poly(ethylene glycol) dimethacrylate and poly(vinylidene fluoride-co-hexafluoropropylene). The superior compatibility between the ILs and polymeric chains ensured the stable existence of quaternary ammonium groups, thus enabling fast metallic anion migration along the continuous pathway in the membrane matrix at a low current density. The prepared PFAEM exhibited a dramatically greater flux of HCrO 4 − (90.7 μmol m −2 s −1 ), which was 9.5 and 4.4 times higher than the flagship commercial Neosepta@ASE and Neosepta@AMX membranes, respectively. The area resistance of PFAEM (3.4 Ω cm 2 ) was found to be 3.4 and 2.0 times lower than those of the Neosepta@ASE and Neosepta@AMX membranes, respectively. Besides, the preeminent transport performance of PFAEM to other metal coordination anions revealed the universality of the prepared membrane. Moreover, the extremely high limiting current density and satisfactory long-term stability of PFAEM manifested bright prospects for realizing efficient metal separation in industrial-scale applications.
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
DESALINATION
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2025
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IF 9.8
Junbin Liao,Yifan Xu,Qishun Zhang,Wenlong Ding,Yanqing Xu,Wenhui Shi,Jiangnan Shen
The discharge of industrial wastewater containing organic solvents and mixed inorganic ions causes severe resource waste and poses significant risks to environmental sustainability and human health. To address the challenge of recovering resources (e.g., salts) from complex wastewater systems, electrodialysis (ED) using ion exchange membranes （IEMs） with robust thermal, mechanical, and chemical stability has emerged as a promising strategy. In this study, a series of polybenzimidazole (PBI)-based anion exchange membranes (AEMs) functionalized with dual-side-chains have been developed, exhibiting a low swelling ratio (<10 %), exceptional solvent resistance, and high perm-selectivity for Cl − /SO₄ 2− separation during ED. The optimized PBI-IM-6C membrane demonstrates outstanding stability, with a weight loss of <6 % after 120-day immersion in various organic solvents at room temperature and no detectable degradation after one week in DMAc at 80 °C. Notably, the PBI-IM-6C membrane could achieve a Cl − /SO₄ 2− perm-selectivity of 49.11 (vs. 6.50 for Neosepta ACS) at 2.5 mA·cm −2 , along with long-term stability in organic solvent-containing systems. Furthermore, the effects of current density (2.5/5 mA·cm −2 ), feed concentration (0.05/0.1 M), and ternary ion competition (Cl − /SO₄ 2− /NO₃ − ) on separation performance were systematically investigated. This work highlights the potential of crosslinker-free AEMs for efficient mono-valent/di-valent anion separation in organic solvent-mediated ED processes, offering a sustainable approach to wastewater treatment and resource recovery.
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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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Huimin Ruan,Zhihao Zheng,Jiefeng Pan,Congjie Gao,B. Van der Bruggen,Jiangnan Shen
Anion exchange membranes (AEMs) with high monovalent/multivalent anion perselectivity are essential for wide range applications (e.g., electrodialysis (ED)). In this work, we have proposed a facile surficial adhesive modification process to fabricate a highly permselective AEM for ED application. Firstly, a novel sulfonated dopamine (SDA) adhesive was synthesized, followed by coating this kind of polymer-like adhesive on commercial AEMs under alkaline and aerobic conditions. We have found that the SDA coating can significantly enhance the monovalent permselectivity (Cl - /SO 4 2- ), with a permselectivity of 34.02, which is much higher than the corresponding values of dopamine (DA)modified AEM (i.e., 11.59) and of the pristine AEM (i.e., 1.00). In addition, fouling experiments show that the transition time (the point time in fouling experiment when a voltage dramatically increases; that's to say, foulant dramatically occurs) of the optimum membrane is 112 min, indicating the superior anti-fouling property of SDA modified AEM, compared with pristine AEM (76 min). The facile fabrication process and superior performance of modified AEM suggest that as-prepared is potentially applicable in ED for separation of monovalent and multivalent anions.
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
Journal of Materials Chemistry A
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2025
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IF 9.5
Junbin Liao,Qishun Zhang,Yu Xu,Shiyu Zhou,Yifan Xu,Wenlong Ding,Zhiqiang Wu,Haoyu Liu,Yanqing Xu,Huimin Ruan,Jiangnan Shen
The ion separation performance of polymer membrane can be significantly enhanced by constructing suitable and stable ion channels within the dense matrix. In this work, we fabricated four anion exchange membranes (AEMs) based on a type of distorted poly(aryl ether sulfone) bearing dual-side-chains and explored the influence of these dual-side-chains by tuning the ratio of the two on the separation performance of Cl−/F− and Cl−/SO42−. Small-angle X-ray scattering analysis indicated that the as-prepared AEMs in wet state possessed sub-nanometer ion channels with a size of 0.334 nm, which resulted from the synergetic modification of the distorted main chains and dual-side-chains. In addition, the stability of the ion channels could be verified by a very low swelling ratio of 5.3%. The AEM with the smallest ion channel demonstrated superior perm-selectivity (Cl−/SO42−) of 52.21 during the electrodialysis (ED) process, compared to other AEMs, such as ACS AEM, which showed a selectivity of 18.63. In addition, the optimum AEM (PPH-sIm10−X-5NX) also exhibited selectivity for Cl−/F− due to its dense structure and hydrophobic side chains. By using free volume and electrostatics-driven simulations, it was inferred that the ion-blocking effect of the dense membrane structure on the transport of larger ions was effective. As a result, this dual-side-chain polymer with a distorted backbone is conducive to constructing stable sub-nanometer ion channels in AEMs for mono-/bi-valent anion resource recovery.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）