文献名： A novel multinuclear zinc complex Zn-Bet-Tf2N for electroplating wastewater treatment using forward osmosis technique

作者 ： ongzhen Chen Xialu 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][Tf ₂ N]), a multinuclear zinc complex of [Zn ₄ (bet) ₁₀ (H ₂ O) ₂ ][Tf ₂ N] ₈  (Zn-Bet-Tf ₂ N) 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-Tf ₂ N generates a sufficient osmotic pressure to drive the FO process and minimizes reverse solute diffusion. Zn-Bet-Tf ₂ N 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-Tf ₂ N increase by up to 50 % compared to those of the conventional NaCl, MgCl ₂  and NH ₄ HCO ₃  draw solutes in zinc-containing wastewater reclamation. Zn-Bet-Tf ₂ N is readily separated from water after FO through solvent extraction. With no energy input or by-products, the recycling of Zn-Bet-Tf ₂ N is more practical than that of other draw solutes ever reported. Reproducible results are obtained when the recycled Zn-Bet-Tf ₂ N is reused to FO processes. These findings suggest that the Zn-Bet-Tf ₂ N facilitated FO system can achieve high water recovery efficiency, high selectivity and sustainability in zinc-containing wastewater treatment.