Fig. 1

SEM image of resin sevelamer (a) and resin S-SO3H (b). a sevelamer before supported by ClSO3H, b sevelamer after supported by ClSO3H
SEM image of resin sevelamer (a) and resin S-SO3H (b). a sevelamer before supported by ClSO3H, b sevelamer after supported by ClSO3H