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Advancing Lithium-Magnesium Separation: Pioneering Swelling-Embedded Cation Exchange Membranes Based on Sulfonated Poly(ether ether ketone).
Qian, Hao; Xu, Geting; Yang, Shanshan; Ang, Edison Huixiang; Chen, Quan; Lin, Chenfei; Liao, Junbin; Shen, Jiangnan.
Affiliation
  • Qian H; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
  • Xu G; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
  • Yang S; Shijiazhuang Key Laboratory of Low Carbon Energy Materials, College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China.
  • Ang EH; Nature Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore.
  • Chen Q; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
  • Lin C; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
  • Liao J; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
  • Shen J; College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
ACS Appl Mater Interfaces ; 16(14): 18019-18029, 2024 Apr 10.
Article in En | MEDLINE | ID: mdl-38546167
ABSTRACT
With the continuous advancement of electrodialysis (ED) technology, there arises a demand for improved monovalent cation exchange membranes (CEMs). However, limitations in membrane materials and structures have resulted in the low selectivity of monovalent CEMs, posing challenges in the separation of Li+ and Mg2+. In this investigation, a designed CEM with a swelling-embedded structure was created by integrating a polyelectrolyte containing N-oxide Zwitterion into a sulfonated poly(ether ether ketone) (SPEEK) membrane, leveraging the notable solubility characteristic of SPEEK. The membranes were prepared by using N-oxide zwitterionic polyethylenimine (ZPEI) and 1,3,5-benzenetrlcarbonyl trichloride (TMC). The as-prepared membranes underwent systematic characterization and testing, evaluating their structural, physicochemical, electrochemical, and selective ED properties. During ED, the modified membranes demonstrated notable permeability selectivity for Li+ ions in binary (Li+/Mg2+) systems. Notably, at a constant current density of 2.5 mA cm-2, the modified membrane PEI-TMC/SPEEK exhibited significant permeability selectivity (PMg2+Li+=5.63) in the Li+/Mg2+ system, while ZPEI-TMC/SPEEK outperformed, displaying remarkable permeability selectivity (PMg2+Li+=12.43) in the Li+/Mg2+ system, surpassing commercial monovalent cation-selective membrane commercial monovalent cation-selective membrane (CIMS). Furthermore, in the Li+/Mg2+ binary system, Li+ flux reached 9.78 × 10-9 mol cm-2 s-1 for ZPEI-TMC/SPEEK, while its Mg2+ flux only reached 2.7 × 10-9 mol cm-2 s-1, showing potential for lithium-magnesium separation. In addition, ZPEI-TMC/SPEEK was tested for performance and stability at high current densities. This work offers a straightforward preparation process and an innovative structural approach, presenting methodological insights for the advancement of lithium and magnesium separation techniques.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: ACS Appl Mater Interfaces Journal subject: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Year: 2024 Document type: Article Affiliation country: China Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: ACS Appl Mater Interfaces Journal subject: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Year: 2024 Document type: Article Affiliation country: China Country of publication: United States