| 摘要 |
PURPOSE:To remove the particle layer from an ion exchange membrane easily and effectively, by immersing an ion exchange membrane having metal or metal compound particle layer on the surface in hydrofluoric acid, etc., and removing the particles with ultrasonic irradiation, etc. CONSTITUTION:An ion exchange membrane (preferably a fluorine-containing ion exchange membrane) having a layer of metal or metal compound particles composed of the oxide, hydroxide, nitride or carbide of a metal of the group IVA, IVB, VB or VIB, a noble metal, Al, Mn or Sb(preferably oxide of Zr, Ti, etc.) is immersed in hydrofluoric acid solution (5-50wt% concentration) or a mixture of hydrofluoric acid and other inorganic acid (preferably sulfuric acid)(the concentration of the hydrofluoric acid is same as above) for 1-48hr, and irradiated with ultrasonic radiation in an aqueous medium (preferably at 5-80 deg.C) to remove the particle layer from the ion exchange. |
