(a) Effect of pH value on the sorption properties of IO₃⁻ by Ce(IV)-MOF-808 (Conditions: contact time = 12 h, [I]_initial = 50 mg·L⁻¹, m_sorbent/V_solution = 1 g·L⁻¹). Adsorption kinetics curve under the condition of pH 7 (b) and pH 2 (c) (Conditions: [I]_initial = 50 mg·L⁻¹, m_sorbent/V_solution = 1 g·L⁻¹). Adsorption isotherm curve under the condition of pH 7 (d) and pH 2 (e) (Conditions: contact time = 12 h, m_sorbent/V_solution = 1 g·L⁻¹). (f) Comparison of equilibrium time and the maximum capacity for reported adsorbents and Ce(IV)-MOF-808 in this work. The detailed experimental conditions, including the solid/liquid ratio and pH values, are listed in Table S6.