Adsorption Characteristics of Bixin on Acid- and Alkali-Treated Kaolinite in Aprotic Solvents

Figure 3

Absorption spectra of bixin in acetone (a) and dimethyl carbonate (b) before adsorption (I) and supernatant solution of bixin after adsorption on KN (III), KA (II), and KB (IV).

(a)

(b)