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Thermodynamic and kinetic aspects on the biosorption of cadmium by low cost materials: A review

Thermodynamic and kinetic aspects on the biosorption of cadmium by low cost materials: A review
Thermodynamic and kinetic aspects on the biosorption of cadmium by low cost materials: A review
Cadmium is internationally recognized as an important pollutant in the environment, and different methods for its removal from wastewaters (chemical precipitation being the most commonly used) have been reported in the literature. Those methods are in most cases oriented to situations with high concentrations of the pollutant. Thus, alternative removal and recovery methods are being considered for removing very low concentrations of cadmium. These methods are all based on biosorption, the passive adsorption and sequestration of metals by several natural materials of biological origin. In this review we have considered the biosorption of cadmium onto biomaterials from a physicochemical, thermodynamic, and kinetic perspective. The thermodynamic perspective is based on the characterization of the interactions of the binding sites of the biosorbents with cadmium species in aqueous solution. Traditionally, this approach has been quantified using different kinds of isotherms. In addition, the description is completed by taking into account electrostatic effects, and the influence of pH and ionic strength, which are associated with the negative charge developed, in most cases, by the biomaterial. The other point of view in this review is the kinetic one, which is necessary for a full physicochemical description of the sorbate - biosorbent system. Consequently, an updated description of the various approaches commonly employed in kinetic studies in biosorption has been carried out.
acid-base properties, biosorption, cadmium, isotherms, kinetics
1448-2517
400-418
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Herrero, Roberto
083bf72e-e314-4edb-86a0-9ba61f35a816
Sastre de Vicente, Manuel E.
8b7b6889-35e4-45aa-adb7-c8124dad5938
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Herrero, Roberto
083bf72e-e314-4edb-86a0-9ba61f35a816
Sastre de Vicente, Manuel E.
8b7b6889-35e4-45aa-adb7-c8124dad5938

Lodeiro, Pablo, Herrero, Roberto and Sastre de Vicente, Manuel E. (2006) Thermodynamic and kinetic aspects on the biosorption of cadmium by low cost materials: A review. Environmental Chemistry, 3 (6), 400-418. (doi:10.1071/EN06043).

Record type: Article

Abstract

Cadmium is internationally recognized as an important pollutant in the environment, and different methods for its removal from wastewaters (chemical precipitation being the most commonly used) have been reported in the literature. Those methods are in most cases oriented to situations with high concentrations of the pollutant. Thus, alternative removal and recovery methods are being considered for removing very low concentrations of cadmium. These methods are all based on biosorption, the passive adsorption and sequestration of metals by several natural materials of biological origin. In this review we have considered the biosorption of cadmium onto biomaterials from a physicochemical, thermodynamic, and kinetic perspective. The thermodynamic perspective is based on the characterization of the interactions of the binding sites of the biosorbents with cadmium species in aqueous solution. Traditionally, this approach has been quantified using different kinds of isotherms. In addition, the description is completed by taking into account electrostatic effects, and the influence of pH and ionic strength, which are associated with the negative charge developed, in most cases, by the biomaterial. The other point of view in this review is the kinetic one, which is necessary for a full physicochemical description of the sorbate - biosorbent system. Consequently, an updated description of the various approaches commonly employed in kinetic studies in biosorption has been carried out.

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Published date: 2006
Keywords: acid-base properties, biosorption, cadmium, isotherms, kinetics
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 355098
URI: http://eprints.soton.ac.uk/id/eprint/355098
ISSN: 1448-2517
PURE UUID: 1e257b4a-45b7-4cb8-acf4-189a883f193c

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Date deposited: 30 Jul 2013 13:10
Last modified: 14 Mar 2024 14:29

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Contributors

Author: Pablo Lodeiro
Author: Roberto Herrero
Author: Manuel E. Sastre de Vicente

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