Cho Dong Lyun
(Faculty of Applied Chemical Engineering and The Engineering Research Institute, Chonnam National University)
,
Kim Sung-Hyun
(Faculty of Applied Chemical Engineering and The Engineering Research Institute, Chonnam National University)
,
Huh Yang Il
(Faculty of Applied Chemical Engineering and The Engineering Research Institute, Chonnam National University)
,
Kim Doman
(Faculty of Applied Chemical Engineering and The Engineering Research Institute, Chonnam National University)
,
Cho Sung Yong
(Department of Environmental Engineering, Chonnam National University)
,
Kim Byung-Hoon
(The Engineering Research Institute, Chonnam National University)
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 me...
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.
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.
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가설 설정
1. Flux, rejection, and fouling resistance which determine the filtration efficiency of a membrane in ultrafiltration of waste water are closely related to the surface characteristics of the membrane and thus influenced by the surface modification.
제안 방법
It was reported that O2 plasma treatment or Ar plasma treatment followed by grafting of acrylic acid made the membrane hydrophilic and improved the flux, the fouling resistance, and/or the rejection.810 In this study, a polyethersulfone membrane was surface-modified by the plasma treatment method and effects of the modification on the filtration efficiency of a membrane in waste water treatment were investigated. Polymer-forming plasmas11 such as acrylic acid (AA), diaminocyclohexane (DACH), acetylene, and hexamethyldisiloxane (HMDSO) plasmas as well as a nonpolymer- forming plasma, O2 plasma, were used for the modification.
810 In this study, a polyethersulfone membrane was surface-modified by the plasma treatment method and effects of the modification on the filtration efficiency of a membrane in waste water treatment were investigated. Polymer-forming plasmas11 such as acrylic acid (AA), diaminocyclohexane (DACH), acetylene, and hexamethyldisiloxane (HMDSO) plasmas as well as a nonpolymer- forming plasma, O2 plasma, were used for the modification. In former works, the plasma treatment for the modification of a membrane has mainly been focused on the nonpolymer- forming plasmas.
대상 데이터
plasma reactor shown in Figure 1. The plasmas used for the modification were oxygen (99.99%, Daesung Gas), AA (Junsei Chemical), acetylene (Daesung Gas), DACH (Aldrich Chemical), and HMDSO (Aldrich Chemical) plasmas.
The ultrafiltration membrane used in this study was a polyethersulfone flat-sheet membrane with a diameter of 43 mm, which was purchased from Amicon (PM 10, 10, 000 MWCO). The membrane was surface-modified in a home-made cylindrical R.
성능/효과
2. All of them, especially the fouling resistance, can be greatly improved by AA plasma treatment which modifies the membrane surface by depositing a thin negatively charged hydrophilic film.
3. Oxygen plasma treatment also modifies the membrane surface to be hydrophilic and improves the flux and the fouling resistance but reduces the rejection due to its etching effect.
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