title: Comparative biosorption of mercuric ions from aquatic systems by immobilized live and heat-inactivated Trametes versicolor and Pleurotus sajur-caju.
abstract: Trametes versicolor and Pleurotus sajur-caju mycelia immobilized in Ca-alginate beads were used for the removal of mercuric ions from aqueous solutions. The sorption of Hg(II) ions by alginate beads and both immobilized live and heat-killed fungal mycelia of T. versicolor and P. sajur-caju was studied in the concentration range of 0.150-3.00 mmol dm(-3). The biosorption of Hg(II) increased as the initial concentration of Hg(II) ions increased in the medium. Maximum biosorption capacities for plain alginate beads were 0.144+/-0.005 mmol Hg(II)/g; for immobilized live and heat-killed fungal mycelia of T. versicolor were 0.171+/-0.007 mmol Hg(II)/g and 0.383+/-0.012 mmol Hg(II)/g respectively; whereas for live and heat-killed P. sajur-caju, the values were 0.450+/-0.014 mmol Hg(II)/g and 0.660+/-0.019 mmol Hg(II)/g respectively. Biosorption equilibrium was established in about 1 h and the equilibrium adsorption was well described by Langmuir and Freundlich adsorption isotherms. Between 15 and 45 degrees C the biosorption capacity was not affected and maximum adsorption was observed between pH 4.0 and 6.0. The alginate-fungus beads could be regenerated using 10 mmol dm(-3) HCl solution, with up to 97% recovery. The biosorbents were reused in five biosorption-desorption cycles without a significant loss in biosorption capacity. Heat-killed T. versicolor and P. sajur-caju removed 73% and 81% of the Hg(II) ions, respectively, from synthetic wastewater samples.
authors.affiliation: Department of Biology, Kirikkale University, 71450 Yahşihan-Kirikkale, Turkey.
authors.forename: M Y
authors.initials: MY
authors.lastname: Arica
authors.forename: C
authors.initials: C
authors.lastname: Arpa
authors.forename: B
authors.initials: B
authors.lastname: Kaya
authors.forename: S
authors.initials: S
authors.lastname: Bektaş
authors.forename: A
authors.initials: A
authors.lastname: Denizli
authors.forename: O
authors.initials: O
authors.lastname: Genç
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry; D001487:Basidiomycota / Q000737:chemistry* / Q000502:physiology; D001673:Biodegradation, Environmental; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000302:isolation & purification*; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D014873:Water Pollutants; D020723:Glucuronic Acid; D008628:Mercury