Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/359
Título: Production of biosorbents from waste olive cake and its adsorption characteristics for Zn2+ Ion
Autor: Fernando, Ana
Monteiro, Sofia
Pinto, Filomena
Mendes, Benilde
Palavras-chave: Bioabsorbents
Chemical treatment
Zinc (II)
Olive cake
Data: 2009
Citação: Sustainability, ISSN 2071-1050, nº 1, 2009, p.277-297
Resumo: In this study, waste olive cake (OC) was utilized as the raw material for the production of biosorbents by chemical treatment and its adsorption capacity for zinc ion was evaluated. Tests were conducted with the total biomass (T) and with the fraction > 2.00 mm (P), in order to determinate the influence of this fractionation step on subsequent treatments. Two chemical agents were used: sulfuric acid and sodium hydroxide. The parameters studied include physical and chemical properties of materials, contact time, pH, adsorbent dose and initial concentrations. The kinetic data were best fitted to the pseudo-second order model. Zinc binding is strongly pH dependent, with more zinc ions bound at a higher pH (5-7 in a range of 3-7). Both Langmuir and Freundlich models are well suited to fit the data on sorption of zinc by OC. Data on sorption of zinc by waste olive cake treated with sulfuric acid (OC-H) was better described by the Freundlich model. Zinc sorption by waste olive cake treated with sodium hydroxide (OC-OH) was better described by the Langmuir model. Results show OC-OH is a biosorbent with a superior adsorption capacity for zinc than OC-H. The maximum adsorption capacity obtained from the Langmuir isotherms increases in the order (mg/g): OC-HT (14), OCT (22) and OC-OHT (27). Results also indicate that the previous fractionation step doesn´t produce a biosorbent with a superior adsorption capacity.
URI: http://hdl.handle.net/10400.9/359
ISSN: 2071-1050
Aparece nas colecções:UEZ - Artigos em revistas internacionais

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