DESALINATION
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2020
·
IF 7.098
Tianyu Wang,Langming Bai,Changyong Zhang,Xuewu Zhu,Jiajian Xing,Yuanqing Guo,Jinlong Wang,Dachao Lin,Guibai Li,Heng Liang
In this study, we investigated the scaling behaviors of Fe in the membrane capacitive deionization (MCDI) systems through batch experiments. By analyzing the migration and transformation of Fe in the MCDI system, it was found that Fe scale was deposited on the ion exchange membrane rather than on the electrode. The characterizations of Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that the FeOOH formed in the solution deposited on the anion exchange membrane , while the iron scale on the cation exchange membrane was mainly Fe 2 O 3 . In the presence of 1 mg/L iron ions , the amount of iron ions adsorbed by the MCDI system was about 25% less than that by the capacitive deionization (CDI). However, at 10 mg/L iron ions, the amount of iron ions absorbed by the MCDI system was almost twice that by the CDI system. This was because that the high concentration of iron ions produced a large number of yellow flocs which were adsorbed by the cation exchange membrane. Ion exchange membrane increased the adsorption capacity of the CDI system, but it did not alleviate the scaling caused by Fe.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Ziqin Li,Jing Guo,Jifu Zheng,Tauqir A. Sherazi,Shenghai Li,Suobo Zhang
A novel microporous anion exchange membrane containing a spirobiindane segment and cardo moiety is successfully synthesized through superacid-catalyzed Friedel–Crafts-type polymerization. The developed polymer showed good solubility in common polar aprotic solvent and exhibited excellent ionic conductivity (163 mS cm–1 at 80 °C). A series of poly(spirobiindane-aryl ether sulfone) copolymers P(SBI/AES)-X with variable SBI/AES molar ratios were synthesized, and each copolymer exposed different free volumes that increases by increasing the content of spirobiindane in the copolymers. In turn, this free volume of copolymer causes the construction of well-developed ion channels in the developed anion exchange membranes (AEMs). The resulting QP(SBI/AES)-0.5 AEM, with an ion exchange capacity (IEC) of 1.59 mmol g–1, exhibited a high hydroxide conductivity of 110 mS cm–1 at 80 °C as well as good mechanical robustness. The peak power density achieved using a single cell fuel cell test is 593 mW cm–2. The results depicted the excellent potential of the resultant microporous anion exchange membrane in the progress of anion exchange membrane fuel cells.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Advanced Membranes
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2025
·
IF 9.5
Wenlong Ding,Haoyu Liu,Jiayi Liao,Tongtong Wang,Dongze Li,Yu Xu,Shiyu Zhou,Zhiqiang Wu,Wenhui Shi,Jiangnan Shen,Junbin Liao
Construction of homogeneous polymer ion-exchange membranes (IEMs) with suitable ion transport channels and stable structures is crucial to the separation of mono-/multi-valent anions. Amphoteric ion-exchange membrane (AIEM) is a special type of IEM that possesses unique properties due to the presence of both anion exchange groups and cation exchange groups. In this work, we have grafted 1-bromoheptane and 3-bromopropanesulfonate onto the poly(aryl ether sulfone) chain through nucleophilic substitution reactions. Unlike the IEM attaching different ion-change functional groups onto one side-chain, this kind of AIEM bears two kinds of ion-change functional groups on dual side-chains. The results show that the as-prepared AIEMs could maintain low water absorption (< 20%) and swelling ratios (< 11%). The optimal surface area resistance is 6.31 Ω∙cm 2 . The perm-selectivity (Cl − /SO 4 2− ) of the optimized PAES-TA/BS-0.85 AIEMs in a binary mixed solution system at 2.5 mA∙cm 2 could be achieved as high as 67.46, which is much higher than commercial ACS IEMs under the same conditions. Small Angle X-ray scattering reveals a distinct phase separation pattern within the AIEM matrix, which is due to the introduction of sulfonates to increase the hydrophilicity of the side-chains. The combined effects of pore size screening and electrostatic repulsion render the high selectivity of as-prepared AIEMs.
研究领域:
材料科学
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化学工程
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膜技术
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电化学
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产品关联
DOI
高影响因子
Polymers
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2019
·Vol. 11
·期 5
·843
·
IF 3.164
Kangjun Xie,Zhen Dong,Yicheng Wang,Wei Qi,Maolin Zhai,Long Zhao
A novel amphoteric ion exchange membrane (AIEM) was successfully prepared by one-step radiation grafting of sodium styrene sulfonate (SSS) and dimethylaminoethyl methacrylate (DMAEMA) onto ethylene-vinylalcohol copolymer (EVOH) powder and sequent transferring into film by casting method. Fourier transform infrared spectrometry (FT-IR), thermal gravimetric analyzer (TGA) and elemental analysis testified SSS and DMAEMA were successfully grafted onto EVOH. The ion exchange capacity, water uptake and proton conductivity of the resulting AIEM increased with grafting yield (GY). At the GY of 40.9%, the permeability of vanadium ions of AIEM was 3.98 × 10−7cm2min−1, which was better than Nafion117 membrane. Furthermore, the cost of this AIEM is much lower than that of Nafion117 membrane. This work provided a low cost and simple method for fabrication of the ion exchange membrane for vanadium redox flow battery (VRFB). Meanwhile, it also provided a new direction for the application of EVOH.Keywords:radiation grafting;ion exchange membrane;EVOH;VRFB
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
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2020
·Vol. 4
·期 8
·4057-4066
·
IF 5.503
Xueqiang Gao,HongMei Yu,Feng Xie,Jinkai Hao,Zhigang Shao
Anion exchange membrane fuel cells (AEMFCs) have attracted growing interest in recent years due to the favored electrochemical kinetics of the oxygen reduction reaction (ORR) and potential low cost, and development of high performance AEMs is always an urgent issue. In this work, a series of cross-linked AEMs with different diamine cross-linkers and various degrees of crosslinking based on the aryl-ether free tri-block copolymer SEBS were prepared using an in situ crosslinking method. FT-IR, XRF and EDS spectra confirm the structures and the degree of crosslinking of the AEMs. Moreover, the cross-linked AEMs demonstrated good mechanical properties and dimensional stability; the tensile strength reached 18.43 MPa (ca. 4.5 times higher than that of the membrane without crosslinking), and the swelling ratios of the cross-linked AEMs were only ca. 10%, which meet the requirement of the AEMFC application. In addition, the cross-linked AEMs demonstrated high ionic conductivity at relatively low IECs and water uptake, and the results of SAXS and TEM verified that the high conductivity could be attributed to the good hydrophilic/hydrophobic phase separation microstructure. Furthermore, in the test of H2/O2 AEMFCs, the MEAs fabricated using the cross-linked membranes displayed good fuel cell performance, especially for the C4-CQASEBS membrane, and the fuel cell realized a peak power density of 585 mW cm−2 at 60 °C. The results indicated that the cross-linked AEMs based on SEBS are a promising candidate material for fuel cell application.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Xuehui Ge,Jun Qian,Zhen Zhu,Yafei Cheng,Lei Yuan,Jinjie Jia,Xiaolei Liu,Hongwei Zhang,Xiaocheng Lin
Membrane separator that is highly ionic conductive and alkaline stable is essential for the efficient, scalable electrocatalytic oxidation of HMF to FDCA, a key process for sustainable development. Drawing inspiration from the microstructural design of Nafion, we developed a series of side-chain imidazolium-functionalized anion exchange membranes (AEMs), employing the chemically stable polyethersulfone (PES) as the base polymer. Functionalization of PES side chains with chloromethyl groups, followed by C2-substituted imidazolium modification, enabled precise tuning of the membrane's physicochemical properties and structural characteristics. This tailored approach yielded an optimized DIM-PES-1.0 AEM exhibiting complete HMF conversion, with 94.0 % selectivity for FDCA and 94.1 % Faradaic efficiency, outperforming the commercial Fumasep FAA-3-PK-130 AEM, which achieved only 85.5 % FDCA selectivity under similar conditions. Notably, the DIM-PES-1.0 AEM demonstrated high alkaline stability, substantially retaining its electrocatalytic activity across 15 cycles, in contrast to the rapid degradation observed in FAA-3-PK-130 AEM after only three cycles. Our findings showcase a scalable, efficient strategy for producing high-performance AEMs under mild conditions, highlighting their potential for advancing sustainable electrocatalytic processes.
研究领域:
化学工程
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可持续发展
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电催化
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Naeem Akhtar Qaisrani,Lingling Ma,Jiafei Liu,Manzoor Hussain,Lv Li,Panyue Li,Shoutao Gong,Fengxiang Zhang,Gaohong He
The anion exchange membranes (AEM) is one of the key components for alkaline electrolyte membrane fuel cells. However, poor alkaline stability and conductivity of the membrane greatly hinders its practical application. Herein, we report a novel 4-(dimethylamino)butyraldehyde diethyl acetal (DABDA) quaternized polysulfone AEM, or PSf-DABDA, which shows improved conductivity and alkaline stability due to the better hydrophilicity and the electron donating effect imparted by the long alkyl substituent with two ether-containing moieties in the cation structure. Its room temperature conductivity reaches 21 mS/cm while that of trimethylamine (TMA)- and dimethylbutylamine (DMBA) quaternized AEMs with comparable ion exchange capacity (IEC) is 11.8 and 13.2 mS/cm, respectively. When treated 150 h in 1 M NaOH at 60 °C, the PSf-DABDA membrane experiences a slight conductivity decrease of 5% while the PSf-TMA and PSf-DMBA membranes with a comparable IEC suffer a more serious conductivity decay of 19 and 13.5%, respectively. The better alkali stability of PSf-DABDA over its counterparts is further confirmed by a density functional theoretical study and a structural characterization before and after the alkali treatment. Our work demonstrates the advantage of the DABDA cation by both experimental and computational study; it presents a new possibility of improving AEM conductivity and stability.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Naeem Akhtar Qaisrani,Lingling Ma,Manzoor Hussain,Jiafei Liu,Lv Li,Ruiting Zhou,Yabin Jia,Fengxiang Zhang,Gaohong He
Anion-exchange membranes (AEM) with high ion content usually suffer from excessive water absorption and dilution effects that impair conductivity and mechanical properties. We herein report a novel ether containing a cross-linking strategy without adopting high ion-exchange capacity (IEC). The ether-containing cross-links and the quaternized structure are created simultaneously by introducing an ether-containing flexible hydrophilic spacer between two 1,4-diazabicyclo[2,2,2,2]octane or DABCO molecules; the resultant bi-DABCO structure was further employed to react with chloromethylated polysulfone. The long spacer with the ether moiety may benefit the hydroxide ion transport, and the cross-links will control the swelling and water absorption of the AEM. The two ether groups in the long spacer of the cross-links will also shield the DABCO cation from OH– attack due to an electron-donating effect. The prepared membranes exhibited an improved conductivity of 31 mS/cm (at 25 °C) at a comparatively low IEC (1.08 mmol/g) with a rational water absorption and low swelling ratio (95.0 and 27.1%, respectively); they also displayed an enhanced alkaline stability in 1 M NaOH aqueous solution at 80 °C for 150 h. The density functional theory study and physical characterization after the alkaline treatment further confirm the better chemical stability of the cross-linked membrane over its counterpart. Our work presents an effective strategy to balance AEM conductivity and robustness.
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
PubMed
高影响因子
Processes
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2021
·Vol. 9
·期 6
·1049
·
IF 2.847
Jinbei Yang,Guangkai Dai,Jing Wang,Shuai Pan,Gang Lu,Xiaoke Shi,Danni Tang,Jinyi Chen,Xiaocheng Lin
Diffusion dialysis (DD) employing anion exchange membranes (AEMs) presents an attractive opportunity for acid recovery from acidic wastewater. However, challenges exist to make highly acid permeable AEMs due to their low acid dialysis coefficient (Uacid). Here, a series of porous and highly acid permeable AEMs fabricated based on chloromethyl polyethersulfone (CMPES) porous membrane substrate with crosslinking and quaternization treatments is reported. Such porous AEMs show highUacidbecause of the large free volume as well as the significantly reduced ion transport resistance relative to the dense AEMs. Compared with the commercial dense DF-120 AEM, our optimal porous AEM show simultaneous 466.7% higherUacidand 75.7% higher acid/salt separation factor (Sacid/salt) when applied to acid recovery at the same condition. Further, considering the simple and efficient fabrication process as well as the low cost, our membranes show great prospects for practical acid recovery from industrial acidic wastewater.Keywords:anion exchange membrane;diffusion dialysis;acid recovery;porous membrane
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Kaihang Zhang,John C. Crittenden
Perfluorooctanoic acid (PFOA) pollution in aqueous environments has become a matter of significant concern due to its adverse effects on the environment and ecosystems. In the pursuit of an efficient PFOA removal method, ion exchange membranes have been employed as adsorbents using the electrosorption technique. This study investigates the electrosorption capacity of PFOA, focusing on factors such as the types of ion exchange membranes, applied potential, residual time, and PFOA concentration. Among the various membranes tested, the polyvinylidene chloride membrane with quaternary ammonium groups demonstrated an impressive 92.5 % removal ratio under an initial concentration of 100 ppm. However, the desorption of PFOA poses a challenge due to its surfactant nature and the strong electrostatic interaction with the quaternary ammonium groups on the membrane surface. Our research findings indicate that using a protic CH 3 OH solution with NaCl enables efficient PFOA desorption. Additionally, the membrane exhibits a remarkable retention of 99.2 % capacity over five electrosorption-desorption cycles. In conclusion, the innovative electrosorption-desorption methods presented in this study offer a promising direction for effective PFOA removal.
研究领域:
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
DESALINATION
·
2024
·
IF 8.3
Xuehui Ge,Huanhuan Zhang,Yafei Cheng,Haiyang Shao,Lei Yuan,Senbin Shen,Guixiang Wang,Chenxiao Jiang,Xiaocheng Lin
A green anion exchange membrane for electrodialysis desalination was synthesized using a solvent-free photo-polymerization approach. Vinylbenzyl chloride (monomer), tripropylene glycol diacrylate (crosslinker), and photoinitiator were mixed and subjected to UV polymerization for 20 min to create the base membrane, followed by positive charge modification with 1-methylimidazole. This method avoids organic solvents, offering economic and environmental benefits. By adjusting the degrees of crosslinking and positive charge, precise control over the membrane's microstructure and properties was achieved. The optimized membrane showed an area resistance of 1.67 Ω cm 2 and a transport number of 0.956, demonstrating exceptional electrochemical performance. Under comparable conditions, the optimized membrane improved the NaCl removal rate by 11.47 %, increased current efficiency by 10.61 %, and reduced energy consumption by 16.75 % compared to commercial AMV membrane, highlighting its potential for scalable seawater desalination through electrodialysis.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qian Yang,Xue Lang Gao,Hong Yue Wu,Yuan Yuan Cai,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Herein, a novel strategy to improve the performance of anion exchange membranes (AEMs) is adopted to build a crosslinked structure by tethering the rigid poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) backbone and the flexible poly(4-vinylphenol) (PVP) backbone using an oscillational chain. The incompatibility between the PPO and PVP backbones makes them self-aggregated resulting in occurrence of distinct microphase separation and development of ion transport channels in the AEMs to facilitate the transport of hydroxide ion. The microphase separation of the as-prepared AEMs has been revealed by transmission electron microscopy (TEM) and DI multimode atomic force microscopy (AFM). The existence of the hydrophilic PVP chain also ensures sufficient water uptake to enhance the conductivity of the AEMs. A maximum ionic conductivity of 134 mS cm −1 is achieved at 80 °C by the PPO-c-PVP-40% (40% is the molar content of PVP chains) membrane. A maximum power density of 173 mW cm −2 at 80 °C is obtained by a H 2 /O 2 single cell using the PPO-c-PVP-40% membrane electrode assembly . The PPO-c-PVP-40% membrane also exhibits robust alkaline stability (retains about 90% ionic conductivity after 480 h alkaline stability test) and excellent mechanical property. Those render the AEMs a potential membrane electrode material for fuel cell applications .
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）