Kinetic, isotherm, and thermodynamic study of uranium biosorption by microalgae Chlorella vulgaris

Articles in Press

Document Type : Original Article

Authors

1 Academic Staff Nuclear Science and Technology Research Institute

2 Nuclear Scuence and Technology Research Inistitute

10.22034/ijche.2023.378125.1266

Abstract

Kinetics and thermodynamics of biosorption of uranium by microalgae Chlorella vulgaris were studied in a batch system at different temperatures and concentrations. The effect of parameters such as pH, contact time, initial pollutant concentration and temperature on the absorption was studied. By investigating the effect of pH, its optimal value was determined to be 4.5 in the studied temperature and concentration range. The maximum absorption value occurred at a temperature of 15°C and an initial concentration of 500 mg/L. It was observed that the absorption capacity of microalgae Chlorella vulgaris for uranium, decreases with increasing temperature. To study the kinetics of the adsorption process, the saturation type kinetic model was used and the correlation coefficients showed that this model is suitable for uranium biosorption. By modeling the equilibrium sorption of uranium absorption by microalgae with Langmuir and Freundlich models, it was observed that the experimental data is in good agreement with the Langmuir isotherm. Also, by using equilibrium constants at different temperatures, thermodynamic parameters (S, H and G) were determined, which indicates exothermal and spontaneity of the process

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Iranian Chemical Engineering Journal

Articles in Press, Accepted Manuscript
Available Online from 08 April 2023

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