Adsorption of Uranium(VI) from Aqueous Solution by Modified Rice Stem

Figure 1

The hue changes of rice stem before and after modification by the modified materials: (a) 0.25 mol/L NaOH; (b) 0.5 mol/L NaOH; (c) 1.0 mol/L NaOH; (d) 1.5 mol/L NaOH; (e) HCl; (f) H₂O₂; (g) ammonium hydroxide; (h) citric acid.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)