摘要
随着我国新能源产业的快速发展,盐湖原卤提锂技术尤为重要,而锂离子与钾离子、镁离子共存增加了分离的难度。二维纳米通道薄膜因具有纳米级的通道结构而在离子分离中展现出良好前景,但通道高度的不稳定性会影响分离性能并降低效率。本研究利用羧甲基纤维素钠(CMC)修饰蒙脱石纳米片构筑二维蒙脱石通道薄膜。结果表明,CMC与纳米片边缘相互作用促进小纳米片组装成大纳米片,增强了纳米片表面负电性,有助于阳离子的传输。同时,CMC的添加可以调控薄膜亲水性并抑制通道膨胀,实现通道高度控制。在盐湖卤水多元离子分离试验中,该薄膜表现出优异的离子分离性能,对Li^(+)/Mg^(2+)的分离选择性为15.10,对K^(+)/Mg^(2+)的分离选择性高达60.30,且在单价离子分离试验中显示出一定的K^(+)/Li^(+)分离选择性,为高性能二维蒙脱石薄膜在盐湖原卤提锂中的应用提供了技术支撑。
With the rapid development of new energy industry in China,the technology of lithium extraction from primary salt-lake brine is particularly important,but the coexistence of lithium ions with potassium ions and magnesium ions increases the difficulty of separation.Two-dimensional nanochannel membranes show good prospects in ion separation due to nanoscale channel structure,but the high instability of channels affects the separation performance and reduce efficiency.In this study,two-dimensional montmorillonite channel membranes were constructed by modifying montmorillonite nanosheets with sodium carboxymethyl cellulose(CMC).The results show that the interaction between CMC and the edge of nanosheets facilitates the assembly of small nanosheets into large nanosheets,which enhances the negative electronegativity of nanosheets surface,and facilitates the transport of cations.Meanwhile,the hydrophilicity of membranes are regulated and the channel expansion is limited to realize the control of channel height by adding CMC.In the salt-lake brine multi-ion separation test,the membranes show excellent ion separation performance,with a separation selectivity of 15.10 for Li+/Mg2+and up to 60.30 for K+/Mg2+.In the monovalent ion separation test,the membranes show certain K+/Li+separation selectivity,which provides technical support for the application of high-performance two-dimensional montmorillonite membranes in lithium extraction from primary salt-lake brine.
作者
王华涛
苗艳晖
赵云良
匡博文
蒋熊睿
高仁波
张婷婷
WANG Huatao;MIAO Yanhui;ZHAO Yunliang;KUANG Bowen;JIANG Xiongrui;GAO Renbo;ZHANG Tingting(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan Clayene Technology Co.,Ltd.,Wuhan 430223,China)
出处
《硅酸盐通报》
北大核心
2025年第8期3069-3078,共10页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划青年科学家项目(2022YFC2906300)
国家自然科学基金面上项目(52374275)
湖北省自然科学基金杰出青年项目(2023AFA084)。
关键词
二维纳米通道薄膜
蒙脱石
盐湖卤水
羧甲基纤维素钠
离子分离
two-dimensional nanochannel membrane
montmorillonite
salt-lake brine
sodium carboxymethyl cellulose
作者简介
王华涛(2000-),男,硕士研究生。主要从事矿物功能材料、盐湖资源利用的研究。E-mail:wht289588@163.com;通信作者:赵云良,博士,教授。E-mail:zyl286@whut.edu.cn。
