San copolymer membranes with ion exchangers for Cu(II) removal from synthetic wastewater by electrodialysis

• Published in: Journal of environmental sciences (China) Vol. 35; pp. 27 - 37
• Main Authors: Caprarescu, Simona, Corobea, Mihai Cosmin, Purcar, Violeta, Spataru, Catalin Ilie, Ianchis, Raluca, Vasilievici, Gabriel, Vuluga, Zina
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.09.2015
• Subjects: Acrylonitrile - chemistry; Copper - chemistry; Copper ions; Electrodialysis; Ion Exchange; Ions - chemistry; Membrane; Polymers - chemistry; Polystyrenes - chemistry; SAN copolymer; Waste Water - analysis; Wastewater treatment; Water Purification - economics; Water Purification - methods; SAN copolymer; Membrane; Copper ions; Ion exchange; Wastewater treatment; Electrodialysis
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2015.02.005

Heterogeneous membranes were obtained by using styrene-acrylonitrile copolymer (SAN) blends with low content of ion-exchanger particles (5wt.%). The membranes obtained by phase inversion were used for the removal of copper ions from synthetic wastewater solutions by electrodialytic separation. The electrodialysis was conducted in a three cell unit, without electrolyte recirculation. The process, under potentiostatic or galvanostatic control, was followed by pH and conductivity measurements in the solution. The electrodialytic performance, evaluated in terms of extraction removal degree (rd) of copper ions, was better under potentiostatic control then by the galvanostatic one and the highest (over 70%) was attained at 8V. The membrane efficiency at small ion-exchanger load was explained by the migration of resin particles toward the pores surface during the phase inversion. The prepared membranes were characterized by various techniques i.e. optical microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and differential thermal analysis and contact angle measurements. [Display omitted]