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

作　　者：梁琦 张二辉 闫光 杨永珍[1] 刘伟峰[1,3] 刘旭光[1,3] LIANG Qi;ZHANG Er-hui;YAN Guang;YANG Yong-zhen;LIU Wei-feng;LIU Xu-guang(Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education,Taiyuan 030024,China;Taiyuan University of Technology,College of Chemistry and Chemical Engineering,Taiyuan 030024,China;Taiyuan University of Technology,Institute of New Carbon Materials,Jinzhong 030600,China)

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024 [2]太原理工大学化学化工学院,山西太原030024 [3]太原理工大学新型碳材料研究院,山西晋中030600

出　　处：《新型炭材料》2020年第6期696-706,共11页New Carbon Materials

基　　金：科技部国家重点研发计划(2017YFB0603104);国家自然科学基金(U1607120,U1610255,51603142);山西省重点研发计划国际合作项目(201903D421077).

摘　　要：以磁性碳纳米球(Fe 3O 4@C)为载体,2-羟甲基-12-冠醚-4为吸附单元,采用表面离子印迹技术设计并制备了对Li^+具有选择性吸附的磁性碳基锂离子印迹材料(Li^+-IIP-Fe 3O 4@C)。首先,采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷对Fe 3O 4@C进行改性,得到硅烷化Si-Fe 3O 4@C。接着用甲基丙烯酸(MAA)对Si-Fe 3O 4@C进行功能化,得到形貌规整且具有较高MAA接枝度的PMAA-Fe 3O 4@C。然后,借助催化剂对甲苯磺酸将2-羟甲基-12-冠醚-4接枝到PMAA-Fe 3O 4@C的表面,进一步在二甲基丙烯酸乙二醇酯的交联聚合下得到Li^+-IIP-Fe 3O 4@C。动力学吸附和等温吸附结果表明,Li^+的吸附符合准二级动力学模型和Langmuir等温模型。Li^+-IIP-Fe 3O 4@C在25 ℃下对Li^+的最大吸附容量达到22.26 mg g^-1。Li^+相对于Na^+,K^+和Mg^2+的选择因子分别为8.06、5.72和2.75。经6次吸附-解吸循环,Li^+-IIP-Fe 3O 4@C的吸附容量仅降低了8.8%,表现出优异的再生性能。A magnetic carbon-based lithium ion-imprinted material(Li^+-IIP-Fe 3O 4@C)with a high Li^+adsorption selectivity was designed and prepared by a surface ion imprinting method,using magnetic carbon nanospheres(Fe 3O 4@C)as the carrier and 2-hydroxymethyl-12-crown-4 as the adsorption unit.First,Fe 3O 4@C was silanized byγ-methacryloxypropyltrimethoxysilane to obtain Si-Fe 3O 4@C which was then functionalized with methacrylic acid(MAA),followed by polymerization to obtain PMAA-Fe 3O 4@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-Fe 3O 4@C in the presence of LiClO 4 under catalysis by p-toluenesulfonic acid.This was cross-linked by ethylene glycol dimethacrylate and eluted by a HNO 3 solution to obtain Li^+-IIP-Fe 3O [e-mail] 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-Fe 3O 4@C for Li^+is 22.26 mg/g at 25℃.The selection factors of Li^+against Na^+,K^+and Mg^2+are 8.06,5.72,and 2.75,respectively.The Li^+adsorption capacity of Li^+-IIP-Fe 3O 4@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 

分 类 号：TB33[一般工业技术—材料科学与工程]