Fig. 2. Adsorption isotherms (a) and distribution coefficient (b) of BnCD-HCPP toward p-nitrophenol, p-chlorophenol, phenol, and methyl orange. The percentage in (a) was calculated as a molar percentage (mol/mol%) of the absorption amount (mmol g^–1) to the amount of CD units (mmol g^–1) in the adsorbent.