Fig. 1. X-ray diffraction patterns of the C50 concrete

Fig. 2. FT-IR spectra of the C50 concrete

Fig. 3. Adsorption/desorption isotherm curve and pore size distribution of the C50 concrete

Fig. 4. SEM images of the C50 concrete before and after the adsorption of Cs⁺ and Ni²⁺ (a) Before adsorption, (b) After Cs⁺ adsorption, (c) After Ni²⁺ adsorption

Fig. 5. Effect of time on adsorptions (a) Cs, (b) Ni

Fig. 6. Effect of C₀ on adsorptions (a) Cs, (b) Ni

Fig. 7. Effect of solid-to-liquid ratio on adsorptions (a) Cs, (b) Ni

Fig. 8. Effect of pH on adsorptions (a) Cs, (b) Ni

Fig. 9. Effects of different ions on adsorptions (a) Cs, (b) Ni

Fig. 10. Effect of temperature on adsorptions (a) Cs, (b) Ni