*2.4. Effect of Coexistences on the Adsorption of Hg2+*

In order to evaluate the selectivity of Hg2+ adsorption, FA48 (0.01 g) was added to the binary solution of 50 mL. The two components were Hg2+ and Na<sup>+</sup> , Mg2+, K<sup>+</sup> , Ca2+, Ni2+ , Cu2+, Zn2+, Sr2+, or Cd2+, and Hg2+ or individual cation concentration was 10 mg/L in a binary solution. The sample solution was shaken at 100 rpm at 25 ◦C for 24 h and filtered through a 0.45 µm membrane filter. The concentration of each metal was measured using an iCAP-7600 Duo. The amount adsorbed was calculated by comparing the levels before and after adsorption.
