a b s t r a c t
In this paper, the performances and efficiency of some novel polymer membranes doped with fumed
silica powder were investigated. The membranes obtained using a laboratory electrodialysis system was
involved in zinc ions removal from model wastewater system. The experiments were carried out using
three concentrations of zinc ions: 500, 1000 and 1500 ppm, respectively; an applied voltage of 5, 10 and
20V; flow rate: 13 mL/min; time for each experiment: 2 h. The removal ratio (R) and mass flow (J) of zinc
ions and also water content (% wt.) were determined. Membranes were characterized by Fourier Trans-
form Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy
(SEM) and electrochemical impedance spectroscopy (EIS). The results indicated that the membranes
doped with fumed silica powder significantly influenced the zinc ions removal process from wastewater,
this fact being proved by a strong enhancement of the removal ratio from 27.56 ± 0.38% to 96.30 ± 0.11%
and by the increase of the mass flow from 8.79 ± 0.12 g/m2h to 92.33 ± 0.10 g/m2h. The FTIR-ATR spectra
showed the existence of a peak located at ∼1079 cm−1 indicating the presence of silica. The TGA results
indicated an improvement of the fouling resistance of the membranes doped with incorporated fumed
silica powder. Other properties are also enhanced by the addition of fumed silica, namely the membrane
hydrophilicity and the ionic conductivity. The highest ionic conductivity was 0.8937 mS/cm at 20V.
© 2015 Elsevier Ltd. All rights reserv
a b s t r a c tIn this paper, the performances and efficiency of some novel polymer membranes doped with fumedsilica powder were investigated. The membranes obtained using a laboratory electrodialysis system wasinvolved in zinc ions removal from model wastewater system. The experiments were carried out usingthree concentrations of zinc ions: 500, 1000 and 1500 ppm, respectively; an applied voltage of 5, 10 and20V; flow rate: 13 mL/min; time for each experiment: 2 h. The removal ratio (R) and mass flow (J) of zincions and also water content (% wt.) were determined. Membranes were characterized by Fourier Trans-form Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy(SEM) and electrochemical impedance spectroscopy (EIS). The results indicated that the membranesdoped with fumed silica powder significantly influenced the zinc ions removal process from wastewater,this fact being proved by a strong enhancement of the removal ratio from 27.56 ± 0.38% to 96.30 ± 0.11%and by the increase of the mass flow from 8.79 ± 0.12 g/m2h to 92.33 ± 0.10 g/m2h. The FTIR-ATR spectrashowed the existence of a peak located at ∼1079 cm−1 indicating the presence of silica. The TGA resultsindicated an improvement of the fouling resistance of the membranes doped with incorporated fumedsilica powder. Other properties are also enhanced by the addition of fumed silica, namely the membranehydrophilicity and the ionic conductivity. The highest ionic conductivity was 0.8937 mS/cm at 20V.
© 2015 Elsevier Ltd. All rights reserv
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