| Summary: | 碩士 === 中興大學 === 化學工程學系所 === 95 === In this study, cationic surfactants were immobilized onto strong cation exchange membranes to form hydrophobic membrane for the application in solid phase extraction of phenols. First, eight cationic surfactants were immobilized onto two kinds of cation exchange membranes (P81 and I.C.E. 450 unsupported). The results indicate that the use of long-carbon-chain C18 surfactant with counter ion of OH- could achieve better surfactant immobilization performance. When the C18-OH feed amount was 150 μmol, 2000 μmol, and 5000 μmol, respectively, the resulted immobilization percentage on the P81 membrane was 50%, 100%, and 150%, respectively. Phenol, 4-nitrophenol, and 4-chloro-3-methylphenol were the analytes used for batch adsorption and the feed concentration was 1 ppm. For 50% surfactant immobilization, 4-chloro-3-methylphenol could be adsorbed fully while the others could not. For 100% immobilization, only phenol was partly adsorbed. For 150% immobilization, none of them were completely adsorbed onto the membrane. In batch desorption experiment, 100% methanol, 50% ethanol, 50% ethanol with 1 M NaCl, and 50% isopropanol alcohol with 1 M NaCl were used as desorbents. 50% isopropanol alcohol with 1 M NaCl was found to be the best desorbent and its desorption efficiency was 59% for phenol, 94% for 4-nitrophenol, and 83% for 4-chloro-3-methylphenol. For the flow solid-phase-extraction process, the results show that a 17-piece stack of 13 mm disks obtained 40~50 concentration fold for 4-nitrophenol, 20~30 concentration fold for 4-chloro-3-methylphenol, 5~10 concentration fold for phenol, from a feed mixture of 0.1 ppm for each component.
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