Fig. 2.

Uranium adsorption isotherms and kinetics investigations. a Uranium sorption isotherms for POP-based adsorbents. The lines are fit with the Langmuir model; all the fits have R² values higher than 0.99. b The kinetics of uranium adsorption from aqueous solution with an initial concentration (7.56 ppm, 400 mL), at pH ~6, and adsorbent material (3 mg). c Uranium removal kinetics with an initial concentration of 3560 ppb (pH ~6) at a V/m ratio of 50,000 mL g⁻¹. d Enlarged section of green rectangle in c