Volume 35 Issue 6
Dec.  2020
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LIANG Qi, ZHANG Er-hui, YAN Guang, YANG Yong-zhen, LIU Wei-feng, LIU Xu-guang. A lithium ion-imprinted adsorbent using magnetic carbon nanospheres as a support for the selective recovery of lithium ions. New Carbon Mater., 2020, 35(6): 696-706. doi: 10.1016/S1872-5805(20)60533-9
Citation: LIANG Qi, ZHANG Er-hui, YAN Guang, YANG Yong-zhen, LIU Wei-feng, LIU Xu-guang. A lithium ion-imprinted adsorbent using magnetic carbon nanospheres as a support for the selective recovery of lithium ions. New Carbon Mater., 2020, 35(6): 696-706. doi: 10.1016/S1872-5805(20)60533-9

A lithium ion-imprinted adsorbent using magnetic carbon nanospheres as a support for the selective recovery of lithium ions

doi: 10.1016/S1872-5805(20)60533-9
Funds:  National Key Research and Development Program of China (2017YFB0603104), National Natural Science Foundation of China (U1607120, U1610255, 51603142), Key R&D Program of Shanxi Province (International Cooperation, 201903D421077).
  • Received Date: 2020-03-05
  • Rev Recd Date: 2020-04-20
  • Publish Date: 2020-12-31
  • A magnetic carbon-based lithium ion-imprinted material (Li+-IIP-Fe3O4@C) with a high Li+ adsorption selectivity was designed and prepared by a surface ion imprinting method, using magnetic carbon nanospheres (Fe3O4@C) as the carrier and 2-hydroxymethyl-12-crown-4 as the adsorption unit. First, Fe3O4@C was silanized by γ-methacryloxypropyltrimethoxysilane to obtain Si-Fe3O4@C which was then functionalized with methacrylic acid (MAA), followed by polymerization to obtain PMAA-Fe3O4@C with a regular morphology and a high degree of MAA grafting. Finally, 2-hydroxymethyl-12-crown-4 was grafted onto the surface of PMAA-Fe3O4@C in the presence of LiClO4 under catalysis by p-toluenesulfonic acid. This was cross-linked by ethylene glycol dimethacrylate and eluted by a HNO3 solution to obtain Li+-IIP-Fe3O4@C. The kinetic adsorption and isothermal adsorption results for this material show that the adsorption of Li+ conforms to a pseudo-second-order kinetic model and has Langmuir isotherms. The maximum adsorption capacity of Li+-IIP-Fe3O4@C for Li+ is 22.26 mg/g at 25 ℃. The selection factors of Li+ against Na+, K+ and Mg2+ are 8.06, 5.72, and 2.75, respectively. The Li+ adsorption capacity of Li+-IIP-Fe3O4@C decreases by only 8.8% after six adsorption-desorption cycles, demonstrating an excellent regeneration capability and making it very useful for lithium recovery.
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