[1]陈亦洁,王琎,孟晓荣.Fe3O4/MWCNT改性纳滤膜对Mg2+/Li+的分离性能[J].中国给水排水,2024,40(21):81-86.
　CHENYi-jie,WANGJin,MENGXiao-rong.Performance of Fe3O4 /MWCNT Modified Nanofiltration Membranes for Separation of Mg2+ and Li+[J].China Water & Wastewater,2024,40(21):81-86.
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Fe3O4/MWCNT改性纳滤膜对Mg2+/Li+的分离性能

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期数: 2024年第21期 页码: 81-86 栏目: 出版日期: 2024-11-01
Title:
Performance of Fe3O4 /MWCNT Modified Nanofiltration Membranes for Separation of Mg2+ and Li+
作者:
陈亦洁1,2， 王琎2， 孟晓荣1,2
（1.西安建筑科技大学 化学与化工学院，陕西 西安 710055；2.陕西省膜技术分离研究院 陕西省膜分离重点实验室，陕西 西安 710055）
Author(s):
CHEN　Yi-jie1，2， WANG　Jin2， MENG　Xiao-rong1，2
（1. School of Chemistry and Chemical Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Key Laboratory of Membrane Separation of Shaanxi Province， Shaanxi Membrane Separation Technology Research Institute， Xi’an 710055， China）
关键词:
镁锂分离;  荷正电纳滤膜;  四氧化三铁;  多壁碳纳米管;  改性
Keywords:
separation of magnesium and lithium;  positive electrical NF membrane;  ferroferric oxide;  multi-walled carbon nanotube;  modification
摘要:
目前从高镁锂比盐湖卤水提取和分离锂相当困难，为提升Mg2+和Li+的分离效率，将四氧化三铁包覆的多壁碳纳米管（Fe3O4/MWCNT）掺入超滤（UF）基膜中来优化荷正电纳滤（NF）膜的性能，研究了在磁场诱导条件下Fe3O4/MWCNT掺杂对UF膜和NF膜形貌结构和表面性能的影响。磁场诱导Fe3O4/MWCNT纳米粒子迁移到膜表面，最终落于UF基膜与聚酰胺层之间，提升纳滤膜渗透通量的同时提高了膜的荷正电性。当Fe3O4/MWCNT掺杂量为0.5%（质量分数）时，改性NF膜对Mg2+和Li+显示出较高的选择分离性能，分离因子从纯复合NF膜的2.15提升至4.20，水通量提升至49.4 L/（m2·h·MPa）。
Abstract:
Currently, it is extremely challenging to extract and separate lithium from salt lake brine with a high Mg2+/Li+ ratio. To enhance the separation efficiency of Mg2+ and Li+, ferroferric oxide coated multi-walled carbon nanotube (Fe3O4/MWCNT) were integrated into the ultrafiltration (UF) based membrane to optimize the performance of the positive electrical nanofiltration (NF) membrane. The influences of Fe3O4/MWCNT doping on the morphology, structure, and surface properties of UF and NF membranes under magnetic field induction were examined. The Fe3O4/MWCNT nanoparticles were induced by magnetic field to migrate towards the surface of the membrane and eventually dropped between the UF membrane and the polyamide layer. As the osmotic flux of the nanofiltration membrane was enhanced, the positive charge of the NF membrane was likewise augmented. When the doping content of Fe3O4/MWCNT was 0.5% (mass fraction), the modified NF membrane demonstrated a higher selective separation performance for Mg2+ and Li+, with the separation factor increasing from 2.15 to 4.20 and the water flux rising to 49.4 L/(m2·h·MPa).
更新日期/Last Update: 2024-11-01