Open AccessRemoval of methylene blue by biosorption onto Stipa tenacissima L. (Alfa) plants: Kinetics, equilibrium and thermodynamic studies
Author(s) -
Samir Ladjali,
Nadjib Dahdouh,
Samira Amokrane,
El Hadj Mekatel,
Djamel Nibou
Publication year - 2021
Publication title -
acta periodica technologica/acta periodica technologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.134
H-Index - 15
eISSN - 2406-095X
pISSN - 1450-7188
DOI - 10.2298/apt2152033l
Subject(s) - biosorption , endothermic process , chemistry , freundlich equation , gibbs free energy , langmuir , nuclear chemistry , methylene blue , enthalpy , aqueous solution , chromatography , analytical chemistry (journal) , thermodynamics , adsorption , organic chemistry , sorption , physics , photocatalysis , catalysis
This study examines the ability of Stipa tenacissima L. (Alfa) to biosorb the Methylene Blue dye. Biosorption tests were performed in aqueous solution based on certain essential parameters such as solution?s pH (2-12), solid/liquid ratio (1-6 g/L), initial dye concentration (25-125 mg/L) and contact time (0-300 min). The Langmuir, Freundlich, Temkin and Elovich models were applied. It was found that the equilibrium data could be fitted to the Langmuir isotherm for MB biosorption with a maximum capacity qmax 55, 95 mg/g. The kinetic study shows that the experimental data correspond to the pseudo-second order kinetic model. The negative Gibbs values free energy ?G? reveal the spontaneity of MB biosorption at the surface of Stipa tenacissima L. The positive value of ?H? reveals the endothermic nature of the process.