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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Performance of Fe3O4 /MWCNT Modified Nanofiltration Membranes for Separation of Mg2+ and Li+

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第21期 Page: 81-86 Column: Date of publication: 2024-11-01
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）
Keywords:
separation of magnesium and lithium;  positive electrical NF membrane;  ferroferric oxide;  multi-walled carbon nanotube;  modification
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).
Last Update: 2024-11-01