PEDOT surface modified PVDF filtration membrane for conductive membrane preparation and fouling mitigation. Issue 3 (June 2021) - Yuan, Yuchen
Abstract: The organic conductive membrane was prepared by polymerization of 3.4-ethylene dioxythiophene (EDOT) on a PVDF membrane surface via chemical vapor deposition. After modification, the sheet resistance of the organic membrane was 14.07 kΩ/□ and the hydrophilicity of the membrane increased slightly. The adsorption ability of the modified membrane for BSA, sodium humate and sodium alginate decreased, obviously because of the pores being blocked by PEDOT. The solid surface ZETA potential of the modified membrane was much more positive than that of the blank one. The modified membrane showed a certain level of chemical stability during alkali cleaning and NaClO corrosion repeated five times. During the six cycles of short-term filtration, the modified membrane with 1 V/cm of electric field showed stable anti-fouling properties because of less filter cake formation on the membrane surface compared to a blank and modified membrane without electric field. No more divalent cation accumulation on the membrane surface was found under the electric field, which might benefit from its electric neutrality surface. Graphical Abstract: ga1 Highlights: The conductive membrane with 14.07 kΩ/□ of resistance was made based on PEDOT. The adsorption of organic foulants was inhibited after modification. Electric field mitigated the cake formation on modified membrane. No more of Ca 2+ and Mg 2+ accumulation on membrane surface under electric field.