Membrane and Water Treatment

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Microfiltration/ultrafiltration polyamide-6 membranes for copper removal from aqueous solutions

  • El-Gendi, Ayman (Chem. Eng. & Pilot Plant Dept., Eng. Research Division, National Research Center) ;
  • Ali, Sahar (Chem. Eng. & Pilot Plant Dept., Eng. Research Division, National Research Center) ;
  • Abdalla, Heba (Chem. Eng. & Pilot Plant Dept., Eng. Research Division, National Research Center) ;
  • Saied, Marwa (Chem. Eng. & Pilot Plant Dept., Eng. Research Division, National Research Center)
  • Received : 2014.06.16
  • Accepted : 2015.12.24
  • Published : 2016.01.25
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Abstract

Microfiltration/ultrafiltration (MF/UF) Adsorptive polyamide-6 (PA-6) membranes were prepared using wet phase inversion process. The prepared PA-6 membranes are characterized by scanning electron microscopy (SEM), porosity and swelling degree. In this study, the membranes performance has examined by adsorptive removal of copper ions from aqueous solutions in a batch adsorption mode. The $PA-6/H_2O$ membranes display sponge like and highly porous structures, with porosities of 41-73%. Under the conditions examined, the adsorption experiments have showed that the $PA-6/H_2O$ membranes had a good adsorption capacity (up to 120-280 mg/g at the initial copper ion concentration ($C_0$) = 680 mg/L, pH7), fast adsorption rates and short adsorption equilibrium times (less than 1.5-2 hrs) for copper ions. The fast adsorption in this study may be attributed to the high porosities and large pore sizes of the $PA-6/H_2O$ membranes, which have facilitated the transport of copper ions to the adsorption. The results obtained from the study illustrated that the copper ions which have adsorbed on the polyamide membranes can be effectively desorbed in an Ethylene dinitrilotetra acetic acid Di sodium salt ($Na_2$ EDTA) solution from initial concentration (up to 92% desorption efficiency) and the PA-6 membranes can be reused almost without loss of the adsorption capacity for copper ions. The results obtained from the study suggested that the $PA-6/H_2O$ membranes can be effectively applied for the adsorptive removal of copper ions from aqueous solutions.

Keywords

References

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