ENHANCED FLUX IN FO PROCESS BY PLASMA GRAFT POLYMERIZATION OF ACRYLIC ACID ON CTA MEMBRANE
Paper ID : 1271-MST2015-FULL
Authors:
Watsa Khongnakorn *
Faculty of Engineering, Prince of Songkla University Kor-Hong
Abstract:
The cellulose triacetate (CTA) membrane surface modification by low pressure treatment and the subsequent graft polymerization with acrylic acid (AAc) are characterized and observed for FO process. The different discharge gases was used carbon dioxide (CO2) and Argon (Ar) plasma. The CTA membrane samples was prepared and taped on a glass, then exposed to the plasma gas treated to air for 30 min. Then the Ar and CO2 gas plasma flow was adjusted to get a steady pressure of 0.25 mbr and input power discharge at 20 w for exposure time at 10 s. After treated, CTA membranes were quickly immersed in solution containing AAc with concentration 10 % (w/v) for 30 min at 40 °C. Membrane surfaces were characterized by water contact angle measurement, Fourier-transform infrared spectroscopy (ATR–FTIR), Scanning electron microscopy and X-ray photoelectron spectroscopy (XPS), respectively. Contact angle measurements revealed that the water contact angle decreased from 64° to 36°. The hydrophilicity of the CTA membrane surface was significantly enhanced flux and increased >30%. FTIR-ATR spectra suggested that Ar plasma irradiation caused the scission of C-H bonds for subsequent graft reaction on etched and changed the functional group of CTA membrane to carboxylic group by AAc.
Keywords:
Forward osmosis (FO), plasma graft polymerization, acrylic acid (AAc), carbon dioxide (CO2), Argon (Ar)
Status : Paper Accepted (Oral Presentation)