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

梁琦; 张二辉; 闫光; 杨永珍; 刘伟峰; 刘旭光

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

doi: 10.1016/S1872-5805(20)60533-9

梁琦¹,
张二辉²,
闫光¹,
杨永珍^1,,
刘伟峰^1,3,
刘旭光^1,3

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

基金项目: 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）.

详细信息

作者简介:
梁琦,硕士研究生.E-mail:2498435356@qq.com

通讯作者:
杨永珍,博士,教授.E-mail:yyztyut@126.com;刘伟峰,博士,副教授.E-mail:lwf061586@yeah.net

中图分类号: TB33
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出版历程
- 收稿日期: 2020-03-05
- 修回日期: 2020-04-20
- 刊出日期: 2020-12-31

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

1.
Taiyuan University of Technology, Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education, Taiyuan 030024, China;
2.
Taiyuan University of Technology, College of Chemistry and Chemical Engineering, Taiyuan 030024, China;
3.
Taiyuan University of Technology, Institute of New Carbon Materials, Jinzhong 030600, China

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).

摘要

摘要: 以磁性碳纳米球（Fe₃O₄@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-Fe₃O₄@C）。首先，采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷对Fe₃O₄@C进行改性，得到硅烷化Si-Fe₃O₄@C。接着用甲基丙烯酸（MAA）对Si-Fe₃O₄@C进行功能化，得到形貌规整且具有较高MAA接枝度的PMAA-Fe₃O₄@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-Fe₃O₄@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-Fe₃O₄@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-Fe₃O₄@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Mg²⁺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-Fe₃O₄@C的吸附容量仅降低了8.8％，表现出优异的再生性能。
- 吸附 /
- 印迹吸附剂 /
- 锂离子 /
- 磁性 /
- 碳纳米球
Abstract: 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.
- Adsorption /
- Imprinted absorbent /
- Lithium ion /
- Magnetic /
- Carbon nanospheres

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参考文献(35)

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