Photo and Humidity Responsive Mesoporous Poly(ionic Liquid) Membrane for Selective Dye Adsorption

摘要

Photo and humidity responsive mesoporous poly(ionic liquid) (PIL) membrane has been easily fabricated by a template-free phase separation method. Due to the photoisomerization of azobenzene group, the porous structure of membrane can be manipulated by incident light. The pores can be switched "on" and "off" through humidity stimulus. Small-angle X-ray scattering (SAXS) measurement was performed to investigate the mechanism of porous formation and structure changes. Extremely high swelling and water uptake ratios and charged character endow the membrane excellent selective adsorption capability for cationic dye methylene blue (MB). Taking advantage of the structure changes in response to humidity and light, the porous membrane open a door to new fields for special applications.