Lithium-based draw solute for forward osmosis to treat wastewater discharged from lithium-ion battery manufacturing  

作　　者：Rongzhen Chen Xinfei Dong Qingchun Ge 

机构地区：[1]College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350116,China

出　　处：《Frontiers of Chemical Science and Engineering》2022年第5期755-763,共9页化学科学与工程前沿（英文版）

基　　金：supports from the National Natural Science Foundation of China(Grant No.21677035);the Natural Science Foundation of Fujian Province(Grant No.2021J01629).

摘　　要：As draw solute is the core element of forward osmosis(FO)technology,here Li-Bet-Tf_(2)N synthesized from a customized ionic liquid betainium bis(trifluoromethylsulfonyl)imide([Hbet][Tf_(2)N])and Li2CO_(3) recovered from lithium-ion battery(LIB)wastes is proposed as a novel draw solute to treat Li+-containing wastewater from LIB manufacturing through FO filtration.Having high dissociation ability and an extended structure,Li-Bet-Tf_(2)N generates a sufficiently high osmotic pressure to drive the FO filtration efficiently along with insignificant reverse solute diffusion.Li-Bet-Tf_(2)N produces a water flux of 21.3 L·(m^(2)·h)–1 at 1.0 mol∙L^(-1) against deionized water,surpassing conventional NaCl and MgCl2 draw solutes with a higher water recovery efficiency and a smaller solute loss.Li-Bet-Tf_(2)N induces a more stable and higher water permeation flux with a 10.0%water flux decline than NaCl and MgCl_(2) for which the water fluxes decline 16.7%and 16.4%,respectively,during the treatment of 2000 mg∙L^(-1) Li+-containing wastewater for 12 h.More remarkably,unlike other draw solutes which require intensive energy input and complicated processes in recycling,Li-Bet-Tf_(2)N is easily separated from water via solvent extraction.Reproducible results are achieved with the recycled Li-Bet-Tf_(2)N.Li-Bet-Tf_(2)N thus demonstrates a novel class of draw solute with great potentials to treat wastewater economically.

关 键 词：forward osmosis lithium-ion battery draw solution lithium-containing wastewater water treatment 

分 类 号：X703[环境科学与工程—环境工程]