Modeling biosorption of Cr(VI) onto Ulva compressa L. from aqueous solutions

Aid Asma (1) , Amokrane Samira , Nibou Djamel , Elhadj Mekatel , Mohamed Trari , Vasile Hulea (2)

1 USTHB - Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger]
2 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier

The marine biomass Ulva compressa L. (ECL) was used as a low-cost biosorbent for the removal of Cr(VI) from contaminated aqueous solutions. The operating variables were optimized: pH ∼ 2, initial concentration of 25 mg/L, solid/liquid ratio of 6 g/L and a temperature of 50 °C, leading to an uptake elimination of 96%. A full factorial experimental design technique enabled us to obtain a mathematical model describing the Cr(VI) biosorption and to study the main effects and interactions among operational parameters. The equilibrium isotherm was analyzed by the Langmuir, Freundlich and Dubinin–Radushkevich (D-R) models; it has been found that the adsorption process follows well the Langmuir model. Kinetic studies showed that the pseudo-second order model describes suitably the experimental data. The thermodynamic parameters indicated an endothermic heat and a spontaneity of the Cr(VI) biosorption onto ECL.

Domaines: Chimie; Chimie analytique

Aid Asma, Amokrane Samira, Nibou Djamel, Elhadj Mekatel, Mohamed Trari, et al.. Modeling biosorption of Cr(VI) onto Ulva compressa L. from aqueous solutions. Water Science and Technology, 2018, 77 (1), pp. 60-69. ⟨10.2166/wst.2017.509⟩. ⟨hal-01687140⟩