Adsorptive Properties of Sunflower Seed Shells for UO²⁺₂ in Aqueous Solution

Adsorption characteristics of sunflower seed shells have been studied for U(Ⅵ) removal from aqueous solution. The sunflower seed shells were characterized by elemental analysis, scanning electron microscopy, and FT-IR. Adsorption of U(Ⅵ) from aqueous solution by means of sunflower seed shells was studied in a series of batch experiments. The adsorption behavior of U(Ⅵ) onto the adsorbent was investigated as function of pH value, contact time, initial U(Ⅵ) concentration, temperature etc. The results show that the adsorption capacity is 29.2 mg/g at the pH=5.0 and 35 ℃ with initial U(Ⅵ) mass concentration 50 mg/L and adsorbent dose 1.00 g/L.