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 des...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2006-10, Vol.137 (3), p.1649-1655
Main Authors: Lodeiro, P., Herrero, R., Sastre de Vicente, M.E.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Biomass
Cadmium - isolation & purification
Cadmium - metabolism
Cd(II)
Exact sciences and technology
Fixed-bed column
Pollution
Protons
Sargassum - metabolism
Sargassum muticum
Sorption–desorption
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 HNO 3 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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.05.003