膜
萃取(化学)
化学工程
化学
海水
核化学
锂(药物)
超滤(肾)
无机化学
色谱法
水溶液
作者
Zhiwei Qiu,Mingyou Wang,Yu Chen,Tao Zhang,Dongya Yang,Fengxian Qiu
出处
期刊:Desalination
[Elsevier]
日期:2021-06-15
卷期号:506: 115003-
被引量:5
标识
DOI:10.1016/j.desal.2021.115003
摘要
Abstract With the development of the new energy industry, the continuously growing demand for lithium has outstripped supply, leading to a sharp rise in the price of the metal. The lithium extraction from seawater by manganese lithium-ion sieve (LIS) is considered an effective strategy to solve this problem, but high Mn loss, poor dispersion, and recycling difficulty are the biggest obstacles that limit the continuous use of powdered LIS. Herein, polyvinyl alcohol (PVA) reinforced cellulose acetate membrane-Li4Mn5O12 (PVA/CAM-Li4Mn5O12) was prepared to solve these defects and achieves the efficient extraction of Li+. As proof of concept, porous PVA/CAM-Li4Mn5O12 was transformed into PVA/CAM-H4Mn5O12 by acid treatment and then systematically studied in Li+ extraction, and the experimental results show that PVA/CAM-H4Mn5O12 possesses low Mn loss, superior H4Mn5O12 dispersion, and easy to be recycled. Additionally, PVA/CAM-H4Mn5O12 possesses also superior adsorption capacity (23.26 mg/g), high selectivity (Kd value (Li+) is much higher than other ions), anti-fouling properties (AFP). Isotherm and thermodynamic studies have shown that the PVA/CAM-Li4Mn5O12 adsorption of Li+ is a spontaneous, endothermic, monolayer chemical adsorption process. In this work, the porous cellulose-based LIS membrane provides a strategy for solving the high Mn loss and the difficult recovery of LIS during the separation process.
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