Abstract
In this paper, polyacrylonitrile (PAN) as the binder and Li1.6Mn1.6O4 as the powder were used to prepare the composite nanofiber flat-sheet membrane-type adsorbent (ESNM-H) via the electrospinning method. The influence factor on membrane adsorption capacity for Li+ were investigated, such as the concentration of PAN, precursor content, and membrane thickness. When the content of PAN and Li1.6Mn1.6O4 were 10 wt% and 18 wt%, respectively, the equilibrium adsorption capacity for Li+ on ESNM-H with the thickness of 164 ± 4 μm was 1328 mg/m2, and the actual adsorption capacity of powder H1.6Mn1.6O4 incorporated in the nanofiber membrane remained 92% of the unsupported powder. In the artificial salt-lake brine, the adsorption selectivity of ESNM-H for Li+ was higher to other interfering ions (Na+, Ca2+, K+ and Mg2+). After eight cycles, the adsorption capacity of ESNM-H decreased by 8%. The ESNM-H exhibited the better long-term stability. The ESNM-H packed column was enriched with Li+ from 100 mg/L to 726 mg/L after ten consecutive dynamic adsorption–desorption cycles. The overall results show that the composite nanofiber flat-sheet membrane-type adsorbent fabricated via the electrospinning method has potential applications and recyclability in adsorbing Li+ from salt-lake brine.
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