Alkaline and acidic treatment of PAN ultrafiltration membranes for salt rejection increment

In this research, the surface and structure of polyacrylonitrile (PAN) ultrafiltration membranes were treated by annealing, soaking in alkaline and acidic solutionsrespectively for achieving to the best permeation properties of Na2SO4, MgSO4 and NaCl in the feed solution. Annealing at 70 ºC water bath, followed by 30 minutes hydrolysisusing 1 molar NaOH and 30 minutes HCl post treatment showed the best post treatment process. The final rejection of 85%, 45% and 49% for Na2SO4, MgSO4 and NaCl, which was obtained respectively, prooved this approach is a favorite candidate to improve the permeation properties for industrial operation and commercial applications

کلیدواژه ها:

alkaline solution ، acidic treatment ، nanofiltration membrane