PVDF-H_(1.6)Mn_(1.6)O_4锂离子筛膜的制备及其提锂性能（英文）

Synthesis of PVDF-H_(1.6)Mn_(1.6)O_4 Lithium Ion-sieve Membrane for Lithium Extraction

锂元素是现代社会中重要的能源元素和战略资源,锂离子筛吸附法被认为是从盐湖卤水和海水中提锂最有前景的方法。然而,锂离子粉末具有流动性和渗透性较差的特点,制膜是一种典型的将之用于工业化的手段。本研究首先制备了多孔球型尖晶石型Li1. 6Mn1. 6O4,然后利用相转化法成功制得了PVDF-Li1. 6Mn1. 6O4多孔交联膜,酸浸后得到了PVDF-H1. 6Mn1. 6O4锂离子筛膜。吸附实验表明,当Li1. 6Mn1. 6O4负载量为11. 9%时,其对应锂离子筛膜的Li+吸附容量最高,可以达到404 mg/m2,循环实验和选择性实验表明锂离子膜具有较好的循环利用性和Li+选择性。

Lithium is a key energy material and strategic resource in modern society,lithium ion-sieve adsorption method is considered to be the most promising method to recovery of lithium from brines and seawater,however,the lithium ion-sieve powder is characteristic of poor fluidity and permeability,membrane formation is a typical approach for developing lithium adsorbents for industrial application.In this study,porous sphere-like spinel Li1.6Mn1.6O4 was firstly synthesized,and then PVDF-Li1.6Mn1.6O4 porous hybrid membrane was successfully prepared by phase inversion method,after acid treatment,the PVDF-H1.6 Mn1.6 O4 lithium ion-sieve membrane was obtained.According to adsorption experiments,when the content of Li1.6Mn1.6O4 is 11.9%,the adsorption capacity of corresponding lithium ion sieve membrane is highest up to 404 mg/m^2.The recycle experiment and selectivity experiment show that the as-obtained lithium ion-sieve membrane has better recycle performance and Li^+selectivity.