新型炭材料2020，Vol.35Issue(6)：696-706,11.DOI:10.1016/S1872-5805(20)60533-9
以磁性碳纳米球为载体的锂离子印迹吸附剂用于锂离子的选择性回收
A lithium ion-imprinted adsorbent using magnetic carbon nanospheres as a support for the selective recovery of lithium ions
摘要
Abstract
A magnetic carbon-based lithium ion - imprinted material (Li+ -IIP-Fe3 O4 @ 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 ob-tain Si-Fe3 O4 @ C which was then functionalized with methacrylic acid (MAA) , followed by polymerization to obtain PMAA-Fe3 O4@ C with a regular morphology and a high degree of MAA grafting. Finally, 2-hydroxymethyl-12-crown-4 was grafted onto the sur-face of PMAA-Fe3O4@ C in the presence of LiC1O4 under catalysis by p-toluenesulfonic acid. This was cross-linked by ethylene gly-col dimethacrylate and eluted by a HNO3 solution to obtain Li+ -IIP-Fe3O4@ C. The kinetic adsorption and isothermal adsorption re-sults 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.关键词
吸附/印迹吸附剂/锂离子/磁性/碳纳米球Key words
Adsorption/ Imprinted absorbent/ Lithium ion/ Magnetic/ Carbon nanospheres分类
通用工业技术引用本文复制引用
梁琦,张二辉,闫光,杨永珍,刘伟峰,刘旭光..以磁性碳纳米球为载体的锂离子印迹吸附剂用于锂离子的选择性回收[J].新型炭材料,2020,35(6):696-706,11.基金项目
科技部国家重点研发计划(2017YFB0603104) （2017YFB0603104）
国家自然科学基金(U1607120,U1610255,51603142) （U1607120,U1610255,51603142）
山西省重点研发计划国际合作项目(201903D421077).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). （201903D421077）
