文獻(xiàn)名： A novel multinuclear zinc complex Zn-Bet-Tf2N for electroplating wastewater treatment using forward osmosis technique

 

作者： ongzhen ChenXialu Liao Qingchun Ge

College of Environment and Resources, Fuzhou University, No.2 Xueyuan Road, Fujian 350116, China

 

摘要：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 multinuclear zinc complex of [Zn₄(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.