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To address the high energy consumption and cost issues of traditional desalination technologies, a continuous desalination system based on organic polymer materials has been developed. The paper synthesizes poly-TEMPO, a redox-active material, through free radical polymerization, and constructs a three-membrane four-chamber electro-desalination device. The alternating oxidation and reduction states of poly-TEMPO drive the directional migration of salt ions to achieve continuous desalination. Experimental results show that in a w(NaCl)= 2×10-3 supporting electrolyte, the cyclic voltammetry redox peak ratio of Poly-TEMPO is approximately 1, and after 500 cycles, the capacity retention rate is 98. 5%, demonstrating excellent electrochemical reversibility. Under continuous desalination mode, the desalination rate for saltwater ranging from w( NaCl) = 5×10-4 to 5×10-3 reaches 0. 41 mg·cm-2·min-1, and with a charging efficiency higher than 95%. For high-concentration saltwater at w( NaCl) = 1×10-2, the single desalination rate exceeds 99%. The stability test proves that the charging efficiency decreases from 97. 5% to 81. 3% after continuous operation for 7 000 min. Additionally, the system demonstrates good removal performance for other chloride salts and various anionic salts. This technology, which utilizing a redox-mediated ion migration mechanism, achieves low-energy desalination and provides theoretical guidance for large-scale, economically efficient water treatment.
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Basic Information:
DOI：10.13353/j.issn.1004.9533.20250111
China Classification Code:P747;TQ316.322
Citation Information:
[1]Li Tong,Wang Yan,Cai Wangfeng.Investigation on the performance of polymeric TEMPO(Poly-TEMPO) for continuous redox desalination[J].Chemical Industry and Engineering().DOI:10.13353/j.issn.1004.9533.20250111.
2026-06-03
2026-06-03
2026-06-03