Isotherm studies for the determination of Cd(II) ions removal capacity in living biomass of a microalga with high tolerance to cadmium toxicity.
Title
Isotherm studies for the determination of Cd(II) ions removal capacity in living biomass of a microalga with high tolerance to cadmium toxicity.Date
2014Citation
Torres E, Mera R, Herrero C, Abalde J. Isotherm studies for the determination of Cd (II) ions removal capacity in living biomass of a microalga with high tolerance to cadmium toxicity. Environ Sci Pollut Res. 2014;21(22):12616–28. http://dx.doi.org/10.1007/s11356-014-3207-y
Abstract
The biosorption characteristics of Cd(II) ions using the living biomass of the
marine diatom Phaeodactylum tricornutum were investigated. This microalga is a
highly tolerant species to cadmium toxicity, for this reason is interesting to know its
potential for use in the removal of Cd(II) ions. The use of living biomass offers better
possibilities than dead biomass since cadmium can also be bioaccumulated inside the
cells. For this purpose, tolerant species are necessary. P. tricornutum is within this
category and in the present manuscript is demonstrated that this microalga has a very
good potential for bioremediation of Cd(II) ions. Cadmium removed by the cells was
divided into three fractions: total, intracellular and bioadsorbed. The experiments were
conducted for 96 h in a concentration range of 1-100 mg Cd(II)/L. Each fraction was
characterized every 24 h by sorption isotherms. The experimental isotherm data were
analysed using the Langmuir, Freundlinch, Dubinin-Radushkevich and Temkin
equations. The biosorption was well described by Langmuir isotherm followed by
Freundlich. The worst model was Temkin. The biosorption capacity of this microalga
for Cd(II) ions was found to be 67.140 ± 3.247 mg/g after 96 h with approximately
40% of this capacity in the intracellular fraction. The bioconcentration factor
determined was 2204.7 after 96 h and with an initial Cd(II) concentration of 1 mg/L.
Keywords
Phaeodactylum tricornutum
Living biomass
Cadmium
Biosorption isotherm
Bioaccumulation
Living biomass
Cadmium
Biosorption isotherm
Bioaccumulation
Editor version
Rights
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ISSN
0944-1344