Abstract
Abstract Two activated carbons (ACs) derived from apple wood (AWAC) and peach stone (PSAC), and one keratinous material extracted from hydrolyzed wool (WHA) were tested for their adsorption capacity for Acid Red 337 (AR) and 1:2 chromium complex of Acid Blue 349 (AB). A commercial granular activated carbon (GAC) was chosen as reference sorbent. The sorbent characteristics, the dye concentration, the contact time and the working pH were the factors taken into consideration. The SEM images of AWAC and PSAC show different morphologies and pore structures. FTIR spectra of the WHA material did not indicate any drastic disruption of keratin macromolecule. The AR dye exhibited higher uptake as compared with the AB dye for all sorbents. The sorption capacity of the tested materials increased in sequence: AWAC
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