1Department of Chemistry, University of Jos, P.M.B. 2084, Jos, Plateau State, Nigeria
2Department of Science Laboratory Technology, University of Jos, P.M.B. 2084, Jos, Plateau State, Nigeria
*Corresponding author email id: samegga13@gmail.com, emmanuels@unijos.edu.ng
Online Published on 22 August, 2024.
The adsorption of Crystal Violet from aqueous solution onto unmodified and Sodium lauryl sulphate modified clay was investigated by batch adsorption experiments. The effects of initial concentration, adsorbent dosage, contact time, pH, and temperature were considered. Under the same conditions, the modified clay was seen to be a better adsorbent than the unmodified clay. In the equilibrium studies, four isotherm models were applied: Freundlich, Langmuir, Dubinin-Radushkevich, and Temkin Isotherms. The adsorption data fitted well for Langmuir isotherm with an R 2 value of 0.99 for the unmodified clay and Freundlich isotherm with an R 2 value of 0.96 for the modified clay. The adsorption followed pseudo second-order kinetics. The thermodynamic study involved the determination of Gibbs free energy change (ΔG), the entropy change (ΔS), and the enthalpy change (ΔH). The positive ΔS and ΔH show the level of randomness and the endothermic nature of the reaction, respectively. The negative ΔG indicates that the process is spontaneous and feasible.
Crystal violet, Adsorption, Barkin Ladi clay, Ultraviolet spectroscopy, Isotherms
