Kinetic, equilibrium, and thermodynamic studies of the biosorption of cadmium (II) from solution by Stereophyllum radiculosum

Abstract

Biosorption of heavy metal ions can be an effective process for the removal of Cd(II) from wastewater. In this study, the batch removal of Cd(II) from dilute aqueous solution using Stereophyllum radiculosum as the biosorbent has been investigated. The Cd(II) uptake was dependent on the initial pH, contact time, initial metal ion concentration, and temperature. The residual Cd(II) in the solution was determined using Atomic Absorption Spectrophotometer. The optimum pH for the biosorption was pH 6. Maximum biosorption was obtained after 60 min of the process. Kinetic study showed that the pseudo-second-order rate equation best described the biosorption process. The adsorption isotherms obtained fitted well into the Freundlich and Langmuir isotherm. The Freundlich equation obtained was log À ¼ 2.6924 logC e þ 0.1131, while the Langmuir equation obtained was 1/À ¼ 0.0008/C e þ 17.41. The correlation factors obtained were 0.0995 and 0.9904, respectively. The free energy change obtained for the biosorption of Cd(II) at 300 K, initial Cd(II) concentration of 100 mg L À1 and pH 6 was À20.894 kJ mol À1 . The thermodynamic study showed that the increase in temperature led to increase in the amount of the metal ion biosorbed. These results indicate that S. radiculosum has potential for the uptake of Cd(II) from industrial effluents.

Biosorption of Cadmium from Aqueous Solutions Using A local Fungus Aspergillus cristatus (Glaucus Group)

“…Sorption isotherms of the typical Langmuir adsorption pattern were applied in different studies concerning removal of cadmium from aqueous solution (Liu et al, 2006;El-Morsy, 2004;Babarinde et al, 2008). The sorption process involves biomass as a solid phase and a liquid phase containing metal ions, with ion distribution between solid and liquid phases determined by the affinity of biomass for metals.…”

Equilibrium and kinetic studies of Cu (II), Cd (II), Pb (II) and Fe (II) adsorption from aqueous solution using cocoa (<i>Theobroma cacao</i>) pod husk

“…The initial fast phase occurs due to surface adsorption on the biomass. The subsequent slow phase occurs due to diffusion of the metal ions into the inner part of the biomass (Babarinde et al, 2007). …”

Adsorption of Copper Using Pomelo Peel and Depectinated Pomelo Peel

“…It is described in the linearized version by the following equation [7]. (6) where k 2ad is the rate constant of second order.…”

“…The increasing of initial metal concentration influenced to the increasing of contact time necessary to reach equilibrium and also increased the adsorption capacity .To analyze the adsorption rate of Cu 2+ onto PP and DPP, two simple kinetic model were tested. Pseudo-first order model is generally described in the linearized version [7] by the following equation …”