| Title |
Solute Rejection Characteristics of Charged Nanofiltration Membrane by pKa of Organic Compound and pKa of Organic Compound and pH Change of Feed Solution |
| Abstract |
Solute rejection of organic compound such as chlorophenols, nitrophenols and pesticides with a flat sheet composite polyvinyl alcohol nanofiltration negatively charged membrane by pKa of organic compound and pH change of feed solution was investigated. It was shown that 4-chloro-2-methylphenoxy acetic acid (MCPA), 2,4,5-trichlorophenol, 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4-dinitrophenol and p-nitrophenol were rejected highly at the pH 9 of feed solution. But rejection of 4-chlorophenoi and phenol was very low at the same pH condition of feed solution. At the pH 3 of feed solution, its rejection was the lowest. When the pH condition of feed solution was more higher than the its pKa, the higher rejection of organic compound was shown. As a result, it was found that rejection of organic compound dissociation occurred was depended on both the pKa of organic compound and the pH of feed solution. |