Figure 6

(a) The desorption of metal ions by different concentrations of HCl; (b) Reusability of SR-PAA during five cycles (The desorption solution was 1 mol L−1 HCl).

(a) The desorption of metal ions by different concentrations of HCl; (b) Reusability of SR-PAA during five cycles (The desorption solution was 1 mol L−1 HCl).