Different models were used in order to describe equilibrium data obtained by heavy metal biosorption tests. Arthrobacter sp. biomass was suspended in aqueous solution and tested as biosorbent material for copper and cadmium ions. The effects of pH on biosorption in single metal systems (copper and cadmium) and on the selectivity of biomass in two metal systems (copper-cadmium) was studied. Biosorption trials performed for each single metal (in the range 0-2 mmol/l) at different equilibrium pHs (3-6 units) showed a general positive effect of pH increase on metal specific uptake. Experimental data obtained for each metal were fitted using adsorption models including Langmuir, Freundlich and Redlich-Peterson isotherms. Biosorption tests were also carried out using binary solutions of copper and cadmium at different equilibrium pH to evaluate biomass selectivity. Modified Langmuir and Freundlich models were used to fit these equilibrium data. The biomass tested was more selective for copper ions and this selectivity changes with equilibrium PH. In both single and two metal systems, a simple procedure of model discrimination was performed to establish which of the tested models better represents the experimental behaviour. (C) 2001 Elsevier Science Ltd. All rights reserved.

Equilibrium biosorption studies in single and multi-metal systems / Pagnanelli, Francesca; Trifoni, Maila; F., Beolchini; Toro, Luigi; F., Veglio'. - In: PROCESS BIOCHEMISTRY. - ISSN 1359-5113. - 37:2(2001), pp. 115-124. [10.1016/s0032-9592(01)00180-7]

Equilibrium biosorption studies in single and multi-metal systems

PAGNANELLI, Francesca;TRIFONI, Maila;TORO, Luigi;
2001

Abstract

Different models were used in order to describe equilibrium data obtained by heavy metal biosorption tests. Arthrobacter sp. biomass was suspended in aqueous solution and tested as biosorbent material for copper and cadmium ions. The effects of pH on biosorption in single metal systems (copper and cadmium) and on the selectivity of biomass in two metal systems (copper-cadmium) was studied. Biosorption trials performed for each single metal (in the range 0-2 mmol/l) at different equilibrium pHs (3-6 units) showed a general positive effect of pH increase on metal specific uptake. Experimental data obtained for each metal were fitted using adsorption models including Langmuir, Freundlich and Redlich-Peterson isotherms. Biosorption tests were also carried out using binary solutions of copper and cadmium at different equilibrium pH to evaluate biomass selectivity. Modified Langmuir and Freundlich models were used to fit these equilibrium data. The biomass tested was more selective for copper ions and this selectivity changes with equilibrium PH. In both single and two metal systems, a simple procedure of model discrimination was performed to establish which of the tested models better represents the experimental behaviour. (C) 2001 Elsevier Science Ltd. All rights reserved.
2001
biosorption; downstream processing; environment; heavy metals; modelling
01 Pubblicazione su rivista::01a Articolo in rivista
Equilibrium biosorption studies in single and multi-metal systems / Pagnanelli, Francesca; Trifoni, Maila; F., Beolchini; Toro, Luigi; F., Veglio'. - In: PROCESS BIOCHEMISTRY. - ISSN 1359-5113. - 37:2(2001), pp. 115-124. [10.1016/s0032-9592(01)00180-7]
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/254719
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 102
  • ???jsp.display-item.citation.isi??? 82
social impact