A novel multinuclear zinc complex Zn-Bet-Tf2N for electroplating wastewater treatment using forward osmosis technique
A novel multinuclear zinc complex Zn-Bet-Tf2N for electroplating wastewater treatment using forward osmosis technique
复制标题
一种新型多核锌配合物Zn-Bet-Tf2N，用于正渗透技术处理电镀废水
DOI：
10.1016/j.cej.2020.126569
复制
发表时间：
2021-01-15
影响因子：
15.1
通讯作者：
Ge, Qingchun
中科院分区：
文献类型：
--
作者：
Chen, Rongzhen;Liao, Xialu;Ge, Qingchun
The unavailability of a suitable draw solute constrains the advancement of forward osmosis (FO) technology. Here from a custom-built ionic liquid betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf2N]), a multi nuclear zinc complex of [Zn-4(bet)(10)(H2O)(2)][Tf2N](8) (Zn-Bet-Tf2N) has been synthesized via a one-pot complexation reaction for electroplating wastewater treatment via FO processes. Possessing a large number of hydrophilic groups and an expanded structure, Zn-Bet-Tf2N generates a sufficient osmotic pressure to drive the FO process and minimizes reverse solute diffusion. Zn-Bet-Tf2N produces a water flux of 15.0 LMH even at a dilute concentration (0.2 mol/L) with negligible solute leakage during the FO process. The water permeation rates induced by Zn-Bet-Tf2N increase by up to 50% compared to those of the conventional NaCl, MgCl2 and NH4HCO3 draw solutes in zinc-containing wastewater reclamation. Zn-Bet-Tf2N is readily separated from water after FO through solvent extraction. With no energy input or by-products, the recycling of Zn-Bet-Tf2N is more practical than that of other draw solutes ever reported. Reproducible results are obtained when the recycled Zn-Bet-Tf2N is reused to FO processes. These findings suggest that the Zn-Bet-Tf2N facilitated FO system can achieve high water recovery efficiency, high selectivity and sustainability in zinc-containing wastewater treatment.
