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Effects of Surface Modification of the Membrane in the Ultrafiltration of Waste Water
Cho Dong Lyun,Kim Sung-Hyun,Huh Yang Il,Kim Doman,Cho Sung Yong,Kim Byung-Hoon The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.6
An ultrafiltration membrane (polyethersulfone, PM 10) was surface-modified by treating it with low-temperature plasmas of oxygen, acrylic acid (AA), acetylene, diaminocyolohexane (DACH), and hexamethyldisiloxane (HMDSO). The effects that these modifications have on the filtration efficiency of a membrane in waste water treatment were investigated. The oxygen, AA, and DACH plasma-treated membranes became more hydrophilic. The water contact angles ranged from < $10^{\circ}\;to\;55^{\circ}$ depending on the type of plasma and the treatment conditions. The oxygen plasma-treated membranes displayed a higher initial flux $(312-429\%),$ but lower rejection $(6-91\%),$ than did an untreated membrane. The AA plasma-treated membranes displayed lower or higher initial flux $(42-156\%),$ depending upon the treatment conditions, but higher rejection $(224-295\%)$ in all cases. The DACH plasma-treated membranes displayed lower initial flux. All of them, especially the AA plasma-treated membrane, displayed improved fouling resistance with either a slower or no flux decline. Acetylene and HMDSO plasma-treated membranes became more hydrophobic and displayed both lower initial flux and lower fouling resistance.
Photocatalytic Characteristics of TiO2 Thin Films Deposited by TiO2 Thin Films Deposited byPECVD
Dong Lyun Cho,Ho Min,김종호,Geun-Seop Cha,Gwi-Sung Kim,Byung Hoon Kim,Seung-Ho Ohk 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.3
iO2 thin films were deposited on glass slides through PECVD with TTIP as a precursor and argon as a carrier gas; their photocatalytic characteristics were investigated. The films were amorphous when deposited at low temperatures, but crystalline with anatase structures at temperatures higher than 300 oC. The film deposited at 400 oC and 5 W exhibited excellent adhesion to the substrate and the best photocatalytic activity. The photocatalytic activity was evaluated based on the degradation efficiency of MB and the bactericidal effect against E. coli under UV-A light. The concentration of MB reduced from 5.0 to 3.5 ppm in 3 h; 99 % of E. coli (2 × 105 CFU/mL) was killed in 1 h.