基材亲疏水性能对EVOH/LIS复合吸附剂成型结构及提锂性能的影响

doi:10.11896/cldb.19110147

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Abstract The lithium ion sieve H_1.6Mn_1.6O₄ (LIS) was used as the adsorbent and the ethylene-vinyl alcohol copolymer (EVOH) was used as the molding substrate to prepare the ethylene-vinyl alcohol/lithium ion sieve (LIS) hollow fiber membrane composite adsorbent. The content of vinyl in EVOH was changed to control the hydrophilicity of the molding material. The effect of the hydrophilicity of the substrate on the molding structure, LIS loading and lithium extraction performance was studied. The results showed that the stronger the hydrophilicity of the molding material, the higher the porosity of the composite adsorbent and the more uniform dispersion of LIS. On the other hand, the hydrophilicity of molding material also had a certain influence on the addition amount of LIS. The maximum content of LIS in composite adsorbent was 30wt% when EVOH-32 is molding material. However,the maximum content of LIS in composite adsorbent was 50wt% when EVOH-38 and EVOH-44 were molding material. In addition, the hydrophilicity of the molding material significantly improved the Li⁺ adsorption capacity, adsorption rate and adsorption-desorption cycle stability of composite adsorbent. Among them, the adsorption capacity of EVOH-32/LIS-30 composite adsorbent remained at 95.8% of the initial Li⁺ adsorption capacity after cyclic adsorption for 5 times, showing good adsorption stability. Finally, the suitable hydrophilic EVOH-38 was selected as molding material to prepare the EVOH-38/LIS-50 hollow fiber membrane composite adsorbent, whose adsorption capacity for Li⁺ was 29.6 mg·g^-1 (93.9% of the adsorption capacity of LIS powder). In the simulated brine with a lithium magnesium ratio higher than 400, the αLi Mg was as high as 559.5, indicating that the composite adsorbent could be used to extract lithium in the brine with a high magnesium lithium ratio.

Key words： lithium ion sieve ethylene-vinyl alcohol copolymer hollow fiber membrane molding structure composite adsorbent

Published: 23 March 2021

CLC number:

TF826.3

Fund:National Natural Science Foundation of China (21868031).

About author:: Baifu Tao majored in chemical engineering (professional master's degree) at the College of Chemistry and Chemical Engineering, Shihezi University. His research direction is separation engineering.
Ruili Guo received her PhD. degree in July 2007 from Tianjin University in engineering. She is currently a professor in Shihezi University, focusing on the research of membrane material, membrane separation technology and its application.

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Cite this article:

TAO Baifu,WANG Zhihui,GUO Ruili. Effects of Hydrophilic/Hydrophobic Properties of Substrate on Molding Structure and Lithium Extraction Performance of EVOH/LIS Composite Adsorbent[J]. Materials Reports, 2021, 35(6): 6180-6188.

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http://www.mater-rep.com/EN/10.11896/cldb.19110147 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6180

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