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Preparation of hybrid LiCl·2Al(OH)3·nH2O/PVDF membrane and its lithium uptaking

Authors： Cheng penggao， Li yuanyuan， Gong jingkuan，Tang na，Xiang jun

Units： College of Chemical Engineering and Material Science，Tianjin University of Science and Technology，Tianjin 300457

KeyWords： LiCl·2Al(OH)3·nH2O ; PVDF ; hybrid membrane ; lithium uptake

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(1):73-79

Abstract：

Aluminum-based lithium adsorbent (LiCl·2Al(OH)3·nH2O) was synthesized with LiCl and AlCl3 by one-step method. The hybrid membrane with lithium adsorption property was successfully prepared by the phase conversion method of LiCl·2Al (OH)3·nH2O and PVDF. The effects of the loading amount of the adsorbent and membrane thickness on the characteristics and the adsorption performance of the hybrid membrane were investigated. The results show that when the content of LiCl·2Al(OH)3·nH2O is 12wt%, there is agglomeration in the membrane pore structure, and the increase of adsorbents improves the hydrophilicity of hybrid membrane, strengthens the resistance of water membrane, and reduces the flux of hybrid membrane; When the composition of hybrid membrane is 16wt% pvdf-10wt% LiCl·2Al(OH)3·nH2O, the adsorption capacity of hybrid membrane basically reaches saturation after dynamic cycle adsorption for 2h, and the adsorption capacity is basically saturated when the desorption time is 120 min, reaching 92.8% of the maximum adsorption capacity; Increasing the thickness of the scraped membrane is conducive to improving the adsorption/desorption capacity; Hybrid membrane, after 10 consecutive adsorption/desorption, the adsorption capacity can still maintain 85.3% of the first time, indicating that it has certain cycle durability.

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AuthorIntro：

程鹏高（1982-），男，湖北咸宁人，工程师，工学硕士，从事水处理技术与应用，分离膜的制备与应用。

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