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Cr-III binding by surface polymers in natural biomass: the role of carboxylic groups

Cr-III binding by surface polymers in natural biomass: the role of carboxylic groups
Cr-III binding by surface polymers in natural biomass: the role of carboxylic groups
The chromium(III)-binding capacity of several biomaterials has been described under fixed conditions of pH (4.5) and initial metal concentration (100 mg L-1). Three of these materials (Sargassum muticum, orange peel and bracken fern) have been selected and subjected to different studies. Fourier transform infrared and scanning electron microscopy techniques were used to describe the structure of the biomaterials, supporting the hypothesis of a mechanism of metal complexation via carboxylic groups. Potentiometric titrations revealed the quantity of carboxyl groups present in S. muticum, orange peel and bracken fern: 1.78, 0.49 and 0.67 mmol g(-1), respectively. Moreover, a model considering different types of binding sites was used to simulate the process and determine the apparent pK values of the main functionalities. The number of carboxylic groups was clearly correlated with the maximum amount of Cr-III binding by the materials. A Langmuir competitive model was used to determine the complexation constants for chromium, log K-Cr, which are very close (similar to 3), supporting the idea of the implication of essentially one acid functionality. Desorption studies were conducted for different times employing H2SO4 and sodium citrate.
bracken fern, chromium, isotherms, orange peel, Sargassum muticum
1448-2517
355-365
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Fuentes, Adrian
1ea55d6e-3b3e-4716-8947-46b58ab251cf
Herrero, Roberto
083bf72e-e314-4edb-86a0-9ba61f35a816
Sastre de Vicente, Manuel E.
8b7b6889-35e4-45aa-adb7-c8124dad5938
Lodeiro, Pablo
f6c1011a-06d0-4095-bc45-2e15e9e492d0
Fuentes, Adrian
1ea55d6e-3b3e-4716-8947-46b58ab251cf
Herrero, Roberto
083bf72e-e314-4edb-86a0-9ba61f35a816
Sastre de Vicente, Manuel E.
8b7b6889-35e4-45aa-adb7-c8124dad5938

Lodeiro, Pablo, Fuentes, Adrian, Herrero, Roberto and Sastre de Vicente, Manuel E. (2008) Cr-III binding by surface polymers in natural biomass: the role of carboxylic groups. Environmental Chemistry, 5 (5), 355-365. (doi:10.1071/EN08035).

Record type: Article

Abstract

The chromium(III)-binding capacity of several biomaterials has been described under fixed conditions of pH (4.5) and initial metal concentration (100 mg L-1). Three of these materials (Sargassum muticum, orange peel and bracken fern) have been selected and subjected to different studies. Fourier transform infrared and scanning electron microscopy techniques were used to describe the structure of the biomaterials, supporting the hypothesis of a mechanism of metal complexation via carboxylic groups. Potentiometric titrations revealed the quantity of carboxyl groups present in S. muticum, orange peel and bracken fern: 1.78, 0.49 and 0.67 mmol g(-1), respectively. Moreover, a model considering different types of binding sites was used to simulate the process and determine the apparent pK values of the main functionalities. The number of carboxylic groups was clearly correlated with the maximum amount of Cr-III binding by the materials. A Langmuir competitive model was used to determine the complexation constants for chromium, log K-Cr, which are very close (similar to 3), supporting the idea of the implication of essentially one acid functionality. Desorption studies were conducted for different times employing H2SO4 and sodium citrate.

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More information

Published date: 2008
Keywords: bracken fern, chromium, isotherms, orange peel, Sargassum muticum
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 355093
URI: http://eprints.soton.ac.uk/id/eprint/355093
ISSN: 1448-2517
PURE UUID: 0946cc12-eeec-4edd-adb3-1fd7e33cce1f

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Date deposited: 30 Jul 2013 09:20
Last modified: 14 Mar 2024 14:28

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Contributors

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

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