title: Adsorption of cadmium(II) on waste biomaterial.
abstract: Significant increase of the adsorption ability of the eggshell biomaterial toward cadmium was observed upon milling, as is evidenced by the value of maximum monolayer adsorption capacity of 329mgg(-1), which is markedly higher than in the case of most "green" sorbents. The main driving force of the adsorption was proven to be the presence of aragonite phase as a consequence of phase transformation from calcite occurring during milling. Cadmium is adsorbed in a non-reversible way, as documented by different techniques (desorption tests, XRD and EDX measurements). The optimum pH for cadmium adsorption was 7. The adsorption process was accompanied by the increase of the value of specific surface area. The course of adsorption has been described by Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The adsorption kinetics was evaluated using three models, among which the best correlation coefficients and the best normalized standard deviation values were achieved for the pseudo-second order model and the intraparticle diffusion model, respectively.
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: M
authors.initials: M
authors.lastname: Baláž
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: Z
authors.initials: Z
authors.lastname: Bujňáková
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: P
authors.initials: P
authors.lastname: Baláž
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: A
authors.initials: A
authors.lastname: Zorkovská
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: Z
authors.initials: Z
authors.lastname: Danková
authors.affiliation: Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia.
authors.forename: J
authors.initials: J
authors.lastname: Briančin
mesh_terms: D000327:Adsorption; D000818:Animals; D002104:Cadmium / Q000302:isolation & purification*; D002119:Calcium Carbonate / Q000737:chemistry*; D002413:Cations, Divalent; D002645:Chickens; D060766:Drinking Water / Q000737:chemistry*; D004531:Eggs / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013816:Thermodynamics; D014866:Waste Products; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D002104:Cadmium; D002119:Calcium Carbonate; D002413:Cations, Divalent; D060766:Drinking Water; D014866:Waste Products; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Adsorption; Cadmium; Eggshell; Milling