Tuning the length of aliphatic chain segments in aromatic poly(arylene ether sulfone) to tailor the micro-structure of anion-exchange membrane for improved proton blocking performance

Chen, Quan; Luo, Jing; Liao, Junbin; Zhu, Chengzhen; Li, Junhua; Xu, Jingwen; Xu, Yanqing; Ruan, Hao; Shen, Jiangnan

doi:10.1016/j.memsci.2021.119860

Cited by 39 publications

(22 citation statements)

References 52 publications

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“…Due to the strong electron-withdrawing effect of the sulfone group, the proton on the side of the benzene ring near the sulfone group shifts δ H to the high-field region. 33 The δ H of the proton on the imidazolium group is also in a similar position. The chemical shift of the proton of IM-PAES-sIM is basically similar to those of 3A-PAES-sIM and 12A-PAES-sIM.…”

Section: Resultsmentioning

confidence: 89%

“…This is due to that H on −NH 2 groups attached on polymer backbone being replaced by side chains. For the stretching vibration absorption band of −CH 2 – at 2900 cm –1 , 12A-PAES-sIM bearing more −CH 2 – groups in the main chain shows a stronger absorption band relative to that of 3A-PAES-sIM . In contrast, IM-PAES-sIM has the smallest absorption band shape at 2900 cm –1 , which results from the absence of −CH 2 – moieties.…”

Section: Results and Discussionmentioning

confidence: 92%

“…The peak around δ H 8.0 is the peak of the proton near the sulfone group on the benzene ring. Due to the strong electron-withdrawing effect of the sulfone group, the proton on the side of the benzene ring near the sulfone group shifts δ H to the high-field region . The δ H of the proton on the imidazolium group is also in a similar position.…”

Section: Results and Discussionmentioning

confidence: 98%

“…For the purpose of readability, the two alkyl bisphenols based on 1,3-dibromopropane, 1,12-dibromododecane, and hydroquinone were denominated as BP- n (BP-3, and BP-12), where n represents the number of methylene (−CH 2 −) units. BP-3 was prepared according to our previous work . In detail, 4.4 g of hydroquinone, 2.0 g of NaOH, and 2.0 g of 1,3-dibromopropane were dissolved in 100 mL of ethanol.…”

Section: Methodsmentioning

confidence: 99%

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Subnanometer Ion Channel Anion Exchange Membranes Having a Rigid Benzimidazole Structure for Selective Anion Separation

et al. 2022

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Ion-conductive polymers having a well-defined phase-separated structure show the potential application of separating mono- and bivalent ion separation. In this work, three side-chain-type poly(arylene ether sulfone)-based anion exchange membranes (AEMs) have been fabricated to investigate the effect of the stiffness of the polymer backbone within AEMs on the Cl–/NO3 – and Cl–/SO4 2– separation performance. Our investigations via small-angle X-ray scattering (SAXS), positron annihilation, and differential scanning calorimetry (DSC) demonstrate that the as-prepared AEM with a rigid benzimidazole structure in the backbone bears subnanometer ion channels resulting from the arrangement of the rigid polymer backbone. In particular, SAXS results demonstrate that the rigid benzimidazole-containing AEM in the wet state has an ion cluster size of 0.548 nm, which is smaller than that of an AEM with alkyl segments in the backbone (0.760 nm). Thus, in the electrodialysis (ED) process, the former exhibits a superior capacity of separating Cl–/SO4 2– ions relative to latter. Nevertheless, the benzimidazole-containing AEM shows an inability to separate the Cl–/NO3 – ions, which is possibly due to the similar ion size of the two. The higher rotational energy barrier (4.3 × 10–3 Hartree) of benzimidazole units and the smaller polymer matrix free-volume (0.636%) in the AEM significantly contribute to the construction of smaller ion channels. As a result, it is believed that the rigid benzimidazole structure of this kind is a benefit to the construction of stable subnanometer ion channels in the AEM that can selectively separate ions with different sizes.

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Section: Resultsmentioning

confidence: 89%

Section: Results and Discussionmentioning

confidence: 92%

Section: Results and Discussionmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

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Subnanometer Ion Channel Anion Exchange Membranes Having a Rigid Benzimidazole Structure for Selective Anion Separation

et al. 2022

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“…The key element of a diffusion-dialysis based acid-recovery system is an anion-exchange membrane, which has a high acid permeability and can retain metal cations [ 5 ]. In recent years, the synthesis of new membranes and the modification of known materials are the main directions in the development of DD [ 6 , 7 , 8 , 9 ], together with module structure optimization [ 10 , 11 ] and researching new applications [ 12 , 13 , 14 , 15 ]. Currently, “plate-and-frame” is the most commonly used membrane module geometry; however, the space-saving characteristics and modular nature of spiral-wound DD membrane modules have attracted much attention [ 4 , 11 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Hydrochloric Acid from Industrial Wastewater by Diffusion Dialysis Using a Spiral-Wound Module

Merkel

Čopák

Голубенко

et al. 2022

IJMS

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In the present study, the possibility of using a spiral-wound diffusion dialysis module was studied for the separation of hydrochloric acid and Zn2+, Ni2+, Cr3+, and Fe2+ salts. Diffusion dialysis recovered 68% of free HCl from the spent pickling solution contaminated with heavy-metal-ion salts. A higher volumetric flowrate of the stripping medium recovered a more significant portion of free acid, namely, 77%. Transition metals (Fe, Ni, Cr) apart from Zn were rejected by >85%. Low retention of Zn (35%) relates to the diffusion of negatively charged chloro complexes through the anion-exchange membrane. The mechanical and transport properties of dialysis FAD-PET membrane under accelerated degradation conditions was investigated. Long-term tests coupled with the economic study have verified that diffusion dialysis is a suitable method for the treatment of spent acids, the salts of which are well soluble in water. Calculations predict significant annual OPEX savings, approximately up to 58%, favouring diffusion dialysis for implementation into wastewater management.

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Ion Resource Recovery via Electrodialysis Fabricated with Poly(Arylene Ether Sulfone)‐Based Anion Exchange Membrane in Organic Solvent System

Xu,

Mu,

Yao

et al. 2023

Small

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Ion resource recovery from organic wastewater is beneficial for achieving emission peaks and carbon neutrality targets. Advanced organic solvent‐resistant anion exchange membranes (AEMs) for treating organic wastewater via electrodialysis (ED) are of significant interest. Herein, a kind of 3D network AEM based on poly(arylene ether sulfone) cross‐linked with a flexible cross‐linker (DBH) for ion resource recovery via ED in organic solvent system is reported. Investigations demonstrate that the as‐prepared AEMs show excellent dimensional stability in 60% DMSO (aq.), 60% ethanol (aq.), and 60% acetone (aq.), respectively. For example, the optimized AEM shows very low swelling ratios of 1.04–1.10% in the organic solvents. ED desalination ratio can reach 99.1% after exposure of the AEM to organic solvents for 30 days, and remain > 99% in a mixture solution containing organic solvents and 0.5 m NaCl. Additionally, at a current density of 2.5 mA cm−2, the optimized AEM soaked in organic solvents for 30 days shows a high perm‐selectivity (Cl−/SO42−) of 133.09 (vs 13.11, Neosepta ACS). The superior ED performance is attributed to the stable continuous sub‐nanochannels within AEM confirmed by SAXS, rotational energy barriers, etc. This work shows the potential application of cross‐linked AEMs for resource recovery in organic wastewater.

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Tuning the length of aliphatic chain segments in aromatic poly(arylene ether sulfone) to tailor the micro-structure of anion-exchange membrane for improved proton blocking performance

Cited by 39 publications

References 52 publications

Subnanometer Ion Channel Anion Exchange Membranes Having a Rigid Benzimidazole Structure for Selective Anion Separation

Subnanometer Ion Channel Anion Exchange Membranes Having a Rigid Benzimidazole Structure for Selective Anion Separation

Recovery of Hydrochloric Acid from Industrial Wastewater by Diffusion Dialysis Using a Spiral-Wound Module

Ion Resource Recovery via Electrodialysis Fabricated with Poly(Arylene Ether Sulfone)‐Based Anion Exchange Membrane in Organic Solvent System

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