Contribution of Ternary Reaction to Pd Sorption on MX-80 in Na-Ca-Cl Solution at High Ionic Strength

Table 2

Optimized surface complexation and cation exchange constants [8].

Sorption reaction
Binary surface complexation:
≡S-OH + Pd^2+↔  ≡S-OPd^+ + H^+	8.2 ± 0.2
≡S-OH + Pd^2+ + H2O ↔  ≡S-OPdOH + 2H^+	2.3 ± 0.2
≡S-OH + Pd^2+ + 2H2O ↔  ≡S- + 3H^+	-5.5 ± 0.2
Ternary surface complexation:
≡S-OH + Pd^2+ + 4Cl^-↔  ≡S- + H^+	13.05 ± 0.2
Cation exchange:
2≡S-ONa + Pd^2+↔ (≡S-O)2Pd + 2Na^+	5.90 ± 0.2