Investigation of Nickel Ions Adsorption by Acacia Auriculiformis Components

Abstract

Aim: The isotherms of the adsorption of nickel (Ni) (II) ions from model aqueous solutions with the initial concentration of metal ions from 0 to 1500 mg/dm 3 by crushed bark, wood sawdust, and leaves of trees of Acacia auriculiformis in static mode are obtained. It has been established that crushed acacia bark has the largest adsorption capacity with respect to Ni II ions (7 mg/g), and the lowest adsorption capacity has acacia leaves (4 mg/g). Adsorption isotherms were calculated using Langmuir, Freundlich, Dubinin-Radushkevich, Temkin, Flory-Huggins, Harkins-Jura, and Frenkel-Halsey-Hill models. Materials and Methods: The sorption properties of leaves, sawdust of wood, and crushed bark of A. auriculiformis were studied in the static adsorption regime using model aqueous solutions of Ni sulfate (II) with initial concentrations of Ni 2+ ions from 0 to 1500 mg/dm 3. Results: It is found that the isotherms of the adsorption of Ni ions by leaves, wood sawdust, and crushed bark are most adequately described by the Dubinin-Radushkevich model with the approximation coefficients R 2 = 0.988, R 2 = 0.988, and R 2 = 0.982, respectively, indicating that the process takes place both in the pores and on the surface of sorption material. The thermodynamic parameters of the adsorption process are calculated. Conclusions: The obtained values of Gibbs energy ΔG and the adsorption energy E indicate that the limiting adsorption stage of Ni (II) ions by A. auriculiformis components is physical adsorption.

Adsorption of Zinc ions by native and modified acacia bark (Acacia auriculiformis)

“…There have been earlier studies of the use of native acacia sawdust and their acidic modifiers for removing Cu 2+ , Ni 2+ , and Zn 2+ ions from simulated solutions and real wastewater [16][17][18]. It was found that treating Acacia auriculiformis sawdust with low concentration acid solutions leads to an increase in the sorption capacity for these metal ions.…”

Adsorption of Nickel (Ii) Ions From Solution Using Sawdust and Modified Sawdust

“…At the ideal circumstances of 90 mins, 1.5 g, and 275 rpm for contact time, adsorbent weight, and agitation speed respectively, an upper limit adsorption capacity of 98.5% was attained. Bark and wood sawdust, together with the leaves of A. auriculiformis, have previously been proven to be effective sorption materials for Ni 2+ cations [12]. Oyewo et al [13] investigated the use of modified sawdust-derived cellulose nanocrystals (CNC) as coagulants for the removal of Cd (II) and Ni (II) ions from water.…”