title: Spectral study of fluorone dyes adsorption on chitosan-based polyelectrolyte complexes.
abstract: Polyelectrolyte complexes of the chitosan-chondroitin sulfate and chitosan-hyaluronate polycation-polyanion pairs were synthesized and characterized as potential dye adsorbents at different pH levels. Equilibrium isotherm analysis was applied to investigate the efficiency and the mechanism of the adsorption of fluorone dyes (fluorescein, eosin Y, erythrosin B) on the synthesized complexes. The inefficiency of the fluorescein adsorption was proved by two different quantitative spectroscopic methods. The adsorption isotherm for both eosin Y and erythrosin B was adequately described in terms of the Langmuir-Freundlich model. The observed room-temperature phosphorescence of the adsorbed erythrosin B was attributed to the surface inhomogeneity of the synthesized complexes. The revealed variation in the adsorption properties of fluorone dyes was related to the differences in their ionic forms as well as in their polarity and hydrophobicity.
authors.affiliation: Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russia. Electronic address: ESlyusareva@sfu-kras.ru.
authors.forename: E
authors.initials: E
authors.lastname: Slyusareva
authors.affiliation: Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russia.
authors.forename: M
authors.initials: M
authors.lastname: Gerasimova
authors.affiliation: BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany.
authors.forename: Capital A Cyrillic
authors.initials: CA
authors.lastname: Plotnikov
authors.affiliation: Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Sizykh
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D002809:Chondroitin Sulfates / Q000737:chemistry; D004801:Eosine Yellowish-(YS) / Q000302:isolation & purification*; D004923:Erythrosine / Q000302:isolation & purification*; D019793:Fluorescein / Q000302:isolation & purification*; D005456:Fluorescent Dyes / Q000302:isolation & purification*; D006820:Hyaluronic Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D008027:Light; D012542:Scattering, Radiation; D012996:Solutions; D013053:Spectrophotometry; D013696:Temperature; D013816:Thermodynamics; D014867:Water
chemical_list: D005456:Fluorescent Dyes; D012996:Solutions; D014867:Water; D006820:Hyaluronic Acid; D002809:Chondroitin Sulfates; D048271:Chitosan; D004923:Erythrosine; D004801:Eosine Yellowish-(YS); D019793:Fluorescein
keywords: Absorption spectra; Adsorption; Chitosan; Chondroitin sulfate; Eosin Y; Erythrosin B; Fluorescein; Hyaluronate; Langmuir–Freundlich isotherm; Polyelectrolyte complex