Adsorption of inorganic mercury from aqueous solutions onto dry biomass of Chlorella vulgaris: kinetic and isotherm study

This study focused on kinetics and equilibrium isotherms of mercury biosorption from water using dry biomass of Chlorella vulgaris as biosorbent at pH 5.0. Biosorption tests were performed at 2.0 g/L biomass dosage varying initial Hg concentration from 11.0 to 90.6 mg/L. The Lagergren equation was f...

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Bibliographic Details
Published in:Environmental technology 2019-02, Vol.40 (5), p.664-672
Main Authors: Solisio, Carlo, Al Arni, Saleh, Converti, Attilio
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Biomass
Biosorption
Chlorella
Chlorella vulgaris
Chlorella vulgaris
kinetics
Equilibrium
Freshwater environments
FT-IR
Hydrogen-Ion Concentration
Industrial effluents
Industrial pollution
Industrial wastewater
Infrared radiation
Isotherms
Kinetics
Mercury
Mercury (metal)
Mercury biosorption
Spectroscopy, Fourier Transform Infrared
Thermodynamics
Wastewater treatment
Water Pollutants, Chemical
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Summary:This study focused on kinetics and equilibrium isotherms of mercury biosorption from water using dry biomass of Chlorella vulgaris as biosorbent at pH 5.0. Biosorption tests were performed at 2.0 g/L biomass dosage varying initial Hg concentration from 11.0 to 90.6 mg/L. The Lagergren equation was found to best describe the process, with R 2 of 0.984 and specific rate constant of 0.029 ± 0.004 min −1 . Although equilibrium data were well fitted by the Dubinin and Radushkevich isotherm (R 2  = 0.870; q DR  = 16.6 mg/g), important insights on phenomenological events occurring at equilibrium were concurrently provided by the Lamgmuir one (R 2  = 0.826; q 0  = 32.6 mg/g; K L  = 0.059 L/mg). FT-IR analysis confirmed that Hg biosorption took place via physisorption. Since C. vulgaris is a fresh-water microalga that can be easily cultivated anywhere, these promising results suggest its possible use as an effective, low-cost biosorbent to treat industrial effluents contaminated by this metal.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2017.1400114