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The marine macroalga Cystoseira baccata as biosorbent for cadmium(II) and lead(II) removal: Kinetic and equilibrium studies

The marine macroalga Cystoseira baccata as biosorbent for cadmium(II) and lead(II) removal: Kinetic and equilibrium studies
The marine macroalga Cystoseira baccata as biosorbent for cadmium(II) and lead(II) removal: Kinetic and equilibrium studies
This work reports kinetic and equilibrium studies of cadmium(II) and lead(II) adsorption by the brown seaweed Cystoseira baccata. Kinetic experiments demonstrated rapid metal uptake. Kinetic data were satisfactorily described by a pseudo-second order chemical sorption process. Temperature change from 15 to 45 degrees C showed small variation on kinetic parameters. Langmuir-Freundlich equation was selected to describe the metal isotherms and the proton binding in acid-base titrations. The maximum metal uptake values were around 0.9 mmol g-1 (101 and 186 mg g-1 for cadmium(II) and lead(II), respectively) at pH 4.5 (raw biomass), while the number of weak acid groups were 2.2 mmol g-1 and their proton binding constant, K-H, 10(3.67) (protonated biomass). FTIR analysis confirmed the participation of carboxyl groups in metal uptake. The metal sorption was found to increase with the solution pH reaching a plateau above pH 4. Calcium and sodium nitrate salts in solution were found to affect considerably the metal biosorption.
biosorption, marine macroalgae, cadmium(II), lead(II), potentiometric titration
0269-7491
264-273
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Barriada, J.L.
43cc6bf4-e197-4561-ad93-6e30c2d3569a
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Barriada, J.L.
43cc6bf4-e197-4561-ad93-6e30c2d3569a
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4

Lodeiro, P., Barriada, J.L., Herrero, R. and Sastre de Vicente, M.E. (2006) The marine macroalga Cystoseira baccata as biosorbent for cadmium(II) and lead(II) removal: Kinetic and equilibrium studies. Environmental Pollution, 142 (2), 264-273. (doi:10.1016/j.envpol.2005.10.001).

Record type: Article

Abstract

This work reports kinetic and equilibrium studies of cadmium(II) and lead(II) adsorption by the brown seaweed Cystoseira baccata. Kinetic experiments demonstrated rapid metal uptake. Kinetic data were satisfactorily described by a pseudo-second order chemical sorption process. Temperature change from 15 to 45 degrees C showed small variation on kinetic parameters. Langmuir-Freundlich equation was selected to describe the metal isotherms and the proton binding in acid-base titrations. The maximum metal uptake values were around 0.9 mmol g-1 (101 and 186 mg g-1 for cadmium(II) and lead(II), respectively) at pH 4.5 (raw biomass), while the number of weak acid groups were 2.2 mmol g-1 and their proton binding constant, K-H, 10(3.67) (protonated biomass). FTIR analysis confirmed the participation of carboxyl groups in metal uptake. The metal sorption was found to increase with the solution pH reaching a plateau above pH 4. Calcium and sodium nitrate salts in solution were found to affect considerably the metal biosorption.

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More information

Published date: July 2006
Keywords: biosorption, marine macroalgae, cadmium(II), lead(II), potentiometric titration
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 355096
URI: http://eprints.soton.ac.uk/id/eprint/355096
ISSN: 0269-7491
PURE UUID: d8d47df7-d466-4e1a-89b9-c47202dbcb7c

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Date deposited: 30 Jul 2013 09:55
Last modified: 14 Mar 2024 14:29

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Contributors

Author: P. Lodeiro
Author: J.L. Barriada
Author: R. Herrero
Author: M.E. Sastre de Vicente

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