Preparation and Electrodialysis Desalination Behavior of DABCO-Me Series-Connected Di-cation AEMs

doi:10.12141/j.issn.1000-565X.220184

Abstract

Abstract:

In order to investigate the effect of functionality of methyl modified 1,4-diazabicyclo [2.2.2] octan-1,4-diaminium di-cation ionomer on its electrodialysis desalination behavior of the tailored anion exchange membranes (AEM), this paper designed and prepared a series of the series-connected di-cation ionomers with different ion exchange capacities (IEC) of methyl modified 1,4-diazabicyclo [2.2.2] octan-1,4-diaminium. The chemical structure, thermal stability, mechanical properties, basic properties and electrodialysis desalination properties of the prepared membranes were systematically characterized. The results show that the chemical structures of the ionomers fit the designing, and the thermal stability, mechanical properties and basic properties of the prepared membranes meet the requirements of electrodialysis desalination process. It is found that the electrodialysis desalination performance of the kind of membrane is improved with the increase of IEC. QPPO-0.20 membrane with the highest IEC has a desalination efficiency of 86.79%, salt flux of 81.39 mg/(m²·s) and energy consumption of 2.35 kW·h/kg. All of the electrodialysis parameters are better than those of the commercial membrane AMX. QPPO-0.20 is promising in the field of electrodialysis desalination.

Key words: electrodialysis desalination, anion exchange membrane, series-connected 1-methyl-1, 4-diazabicyclo ［2.2.2］ octan-1, 4-diaminium di-cation, polyphenylene ether

CLC Number:

O631

LI Xiuhua, CHEN Yawen, ZOU Zilong, et al. Preparation and Electrodialysis Desalination Behavior of DABCO-Me Series-Connected Di-cation AEMs[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(3): 53-62.

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膜	拉伸强度/MPa	断裂伸长率/%
QPPO-0.10	22.71	11.59
QPPO-0.14	13.74	10.25
QPPO-0.20	10.35	19.95
AMX^［23］	35.07	21.32