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

Catalin Ilie Spataru , Gabriel Vasilievici , Mihai Cosmin Corobea , Raluca Ianchis , Simona Caprarescu , Violeta Purcar , Zina Vuluga


Received November 03, 2014,Revised December 15, 2014, Accepted February 13, 2015, Available online May 27, 2015

Volume 35,2015,Pages 27-37

Heterogeneous membranes were obtained by using styrene-acrylonitrile copolymer (SAN) blends with low content of ion-exchanger particles (5 wt.%). 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 8 V. 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.

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