title: Intraparticle diffusion processes during acid dye adsorption onto chitosan.
abstract: The adsorption of five acid dyes onto chitosan was studied. The equilibrium capacities based on the Langmuir analysis were 1.54, 2.66, 1.11, 1.25 and 1.03 mmol/g chitosan for Orange 10 (AO10), Acid Orange 12 (AO12), Acid Red 18 (AR18), Acid Red 73 (AR73) and Acid Green 25 (AG25) respectively. The batch adsorption rate for the five systems based on an intraparticle diffusion rate parameter derived from the plots of dye adsorbed versus the square root of time indicated that the adsorption mechanism was predominantly intraparticle diffusion but there was also a dependence on pore size as the dye diffuses through macropore, mesopore and micropore respectively.
authors.affiliation: Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: W H
authors.initials: WH
authors.lastname: Cheung
authors.forename: Y S
authors.initials: YS
authors.lastname: Szeto
authors.forename: G
authors.initials: G
authors.lastname: McKay
mesh_terms: D000327:Adsorption; D002138:Calibration; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical
chemical_list: D004396:Coloring Agents; D048271:Chitosan