title: Optimization of chitosan and β-cyclodextrin molecularly imprinted polymer synthesis for dye adsorption.
abstract: In this study, two types of novel molecularly imprinted polymers (MIPs) were prepared, for toxic and carcinogenic dyes adsorption. Substrates of the polymeric matrix of the two MIPs were β-cyclodextrin and chitosan. The conditions in the polymerization/imprinting stage and in the rebinding/adsorption step were optimized. The effect of a range of parameters (polymer, cross-linker, and initiator concentrations, reaction time and pH) on the selectivity and adsorption capacity of the dye-MIPs were investigated. Their dye rebinding properties were demonstrated by equilibrium batch experiments (fitting with Freundlich model) and their kinetic rates were exported by the pseudo-first order model. Additionally, a thermodynamic evaluation was carried out through the determination of enthalpy, entropy, and free energy. The selectivity of MIPs was elucidated by their different rebinding capabilities in a trichromatic mixture (composed of related structurally dyes). Regeneration/reuse of the dye-loaded polymers was evaluated via sequential adsorption-desorption cycles.
authors.affiliation: Division of Chemical Technology, School of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
authors.forename: George Z
authors.initials: GZ
authors.lastname: Kyzas
authors.forename: Nikolaos K
authors.initials: NK
authors.lastname: Lazaridis
authors.forename: Dimitrios N
authors.initials: DN
authors.lastname: Bikiaris
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D054802:Molecular Imprinting / Q000379:methods*; D058105:Polymerization; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D047392:beta-Cyclodextrins; D048271:Chitosan