Synthesis and performance estimation of a granulated PVC/PAN-lithium ion-sieve for Li plus recovery from brine
SEPARATION AND PURIFICATION TECHNOLOGY(2023)
摘要
In order to effectively solve the problem of adsorbent powder forming and further promote its industrial application, granulated lithium ion-sieve powder with spherical shape by polyvinyl chloride (PVC) with high mechanical stability of and hydrophilicity of polyacrylonitrile (PAN) with good hydrophilicity was initially prepared in our study by a phase transformation method. Based on the various characterization results, spherical particles materials formation mechanisms were summarized below. Langmuir, D-R, pseudo-second-order kinetics and diffusion kinetic indicated that the adsorption process of Li+ was a multi-step controlled monolayer chemisorption process. In addition, after 50 cycles of dynamic column operation, the adsorption capacity remained around 11.90 mg g+1, and the manganese dissolution loss rate was only 0.15%, which is much lower than that as reported. Therefore, the spherical adsorbent could be used for efficiently recovery Li+ from Salt Lake brine as well as its excellent potential for further application.
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关键词
Lithium ion -sieve,Granulation,Brine,Packed column,Adsorption performance
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