title: Zinc and cadmium biosorption by untreated and calcium-treated Macrocystis pyrifera in a batch system.
abstract: Zinc and cadmium can be efficiently removed from solutions using the brown algae, Macrocystis pyrifera. Treatment with CaCl(2) allowed stabilization of the biosorbent. The maximum biosorption capacities in mono-component systems were 0.91 mmol g(-1) and 0.89 mmol g(-1) and the Langmuir affinity coefficients were 1.76 L mmol(-1) and 1.25 L mmol(-1) for Zn(II) and Cd(II), respectively. In two-component systems, Zn(II) and Cd(II) adsorption capacities were reduced by 50% and 40%, respectively and the biosorbent showed a preference for Cd(II) over Zn(II). HNO(3) (0.1M) and EDTA (0.1M) achieved 90-100% desorption of both ions from the loaded biomass. While HNO(3) preserved the biomass structure, EDTA destroyed it completely. Fourier transform infrared spectra identified the contribution of carboxylic, amine and sulfonate groups on Zn(II) and Cd(II) biosorption. These results showed that biosorption using M. pyrifera-treated biomass could be an affordable and simple process for cadmium and zinc removal from wastewaters.
authors.affiliation: Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI, CCT La Plata-CONICET, UNLP, Facultad de Ciencias Exactas, 50 y 115, 1900 La Plata, Argentina.
authors.forename: J
authors.initials: J
authors.lastname: Plaza Cazón
authors.forename: C
authors.initials: C
authors.lastname: Bernardelli
authors.forename: M
authors.initials: M
authors.lastname: Viera
authors.forename: E
authors.initials: E
authors.lastname: Donati
authors.forename: E
authors.initials: E
authors.lastname: Guibal
mesh_terms: D000327:Adsorption / Q000187:drug effects; D061249:Batch Cell Culture Techniques / Q000379:methods*; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D002104:Cadmium / Q000302:isolation & purification*; D002118:Calcium / Q000494:pharmacology*; D007700:Kinetics; D044662:Macrocystis / Q000187:drug effects* / Q000378:metabolism*; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D012997:Solvents; D002104:Cadmium; D015032:Zinc; D002118:Calcium