Isotherm studies for the determination of Cd (II) ions removal capacity in living biomass of a microalga with high tolerance to cadmium toxicity
| Autor: | Enrique Torres, Roi Mera, Concepción Herrero, Julio Abalde |
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| Rok vydání: | 2014 |
| Předmět: |
Langmuir
Health Toxicology and Mutagenesis chemistry.chemical_element Bioconcentration Phaeodactylum tricornutum Biosorption isotherm symbols.namesake Bioremediation Botany Microalgae Environmental Chemistry Freundlich equation Biomass Living biomass Diatoms Cadmium biology Biosorption Langmuir adsorption model General Medicine Drug Tolerance biology.organism_classification Bioaccumulation Pollution Kinetics Biodegradation Environmental chemistry Environmental chemistry symbols Adsorption Water Pollutants Chemical |
| Zdroj: | RUC. Repositorio da Universidade da Coruña instname |
| ISSN: | 1614-7499 |
| Popis: | 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, it is interesting to know its potential for use in the removal of this metal. The use of living biomass offers better possibilities than that of dead biomass since cadmium can also be bioaccumulated inside the cells. For this purpose, tolerant species are necessary. P. tricornutum is within this category with an EC50,96h of 19.1 ± 3.5 mg Cd (II)/L, and in the present manuscript, it is demonstrated that this microalga has a very good potential for bioremediation of Cd (II) ions in saline habitats. Cadmium removed by the cells was divided into three fractions: total, intracellular and bioadsorbed. The experiments were conducted for 96 h in natural seawater with 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 analyzed using the Langmuir, Freundlich, 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 67.1 ± 3.2 mg/g after 96 h with approximately 40 % of this capacity in the intracellular fraction. The bioconcentration factor determined was 2,204.7 after 96 h and with an initial Cd (II) concentration of 1 mg/L. |
| Databáze: | OpenAIRE |
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