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Batch desorption studies and multiple sorption-regeneration cycles in a fixed-bed column for Cd(II) elimination by protonated Sargassum muticum

Batch desorption studies and multiple sorption-regeneration cycles in a fixed-bed column for Cd(II) elimination by protonated Sargassum muticum
Batch desorption studies and multiple sorption-regeneration cycles in a fixed-bed column for Cd(II) elimination by protonated Sargassum muticum
The protonated alga Sargassum muticum was employed in batch desorption studies to find the most appropriate eluting agent for Cd(II)-laden biomass regeneration. Eleven types of eluting solutions at different concentrations were tested, finding elution efficiencies higher than 90\% for most of the desorbents studied. Total organic carbon and biomass weight loss measurements were made. The reusability of the protonated alga was also studied using a fixed-bed column. Eleven consecutive sorption-regeneration cycles at a flow rate of 10 mL min(-1) were carried out for the removal of 50 mg L-1 Cd(II) solution. A 0.1 M HNO3 solution was employed as desorbing agent. The column was operated during 605 h for sorption and 66 h for desorption, equivalent to a continuous use during 28 days, with no apparent loss of sorption performance. In these cycles, no diminution of the breakthrough time was found; although, a relative loss of sorption capacity, regarding the found in the first cycle, was observed. The slope of the breakthrough curves experiments a gradual increase reaching its maximum value for the last cycle tested (40\% greater than for the first one). The maximum Cd(II) concentration elution peak was achieved in 5 min or less, and the metal effluent concentration was always lower than 0.9 mg L-1 after 1 h of elution. The maximum concentration factor was determined to be between 55 and 109.
Sargassum muticum, fixed-bed column, Cd(II), sorption-desorption
0304-3894
1649-1655
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4
Lodeiro, P.
2a3db327-ecb7-4c32-bc61-13e01aed7182
Herrero, R.
ee7f0139-d8ac-4084-a73e-5eaa91b2e29a
Sastre de Vicente, M.E.
2bd016ef-20cf-4fb4-9282-1ca22142bcb4

Lodeiro, P., Herrero, R. and Sastre de Vicente, M.E. (2006) Batch desorption studies and multiple sorption-regeneration cycles in a fixed-bed column for Cd(II) elimination by protonated Sargassum muticum. Journal of Hazardous Materials, 137 (3), 1649-1655. (doi:10.1016/j.jhazmat.2006.05.003).

Record type: Article

Abstract

The protonated alga Sargassum muticum was employed in batch desorption studies to find the most appropriate eluting agent for Cd(II)-laden biomass regeneration. Eleven types of eluting solutions at different concentrations were tested, finding elution efficiencies higher than 90\% for most of the desorbents studied. Total organic carbon and biomass weight loss measurements were made. The reusability of the protonated alga was also studied using a fixed-bed column. Eleven consecutive sorption-regeneration cycles at a flow rate of 10 mL min(-1) were carried out for the removal of 50 mg L-1 Cd(II) solution. A 0.1 M HNO3 solution was employed as desorbing agent. The column was operated during 605 h for sorption and 66 h for desorption, equivalent to a continuous use during 28 days, with no apparent loss of sorption performance. In these cycles, no diminution of the breakthrough time was found; although, a relative loss of sorption capacity, regarding the found in the first cycle, was observed. The slope of the breakthrough curves experiments a gradual increase reaching its maximum value for the last cycle tested (40\% greater than for the first one). The maximum Cd(II) concentration elution peak was achieved in 5 min or less, and the metal effluent concentration was always lower than 0.9 mg L-1 after 1 h of elution. The maximum concentration factor was determined to be between 55 and 109.

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More information

Published date: 11 October 2006
Keywords: Sargassum muticum, fixed-bed column, Cd(II), sorption-desorption
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 355094
URI: http://eprints.soton.ac.uk/id/eprint/355094
ISSN: 0304-3894
PURE UUID: fe8c9098-48fe-49b3-8f5b-0d420c169cf4

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Date deposited: 30 Jul 2013 09:35
Last modified: 14 Mar 2024 14:28

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Contributors

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

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