Adsorptive approach on nepholometric study of paint effluent using Tympanotonos fuscatus extract

Abstract

Adsorptive study of paint effluent coagulation using T. fuscatus coagulant (TFC) is investigated. Effects of pH, dose, time, and temperature were investigated. Functional group, crystalline, morphology and thermal characteristics of samples were determined. Equilibrium data were analysed by Langmuir, Freundlich, Temkin, Frumkin, and Dubinin-Radushkevich (D-R) isotherms. Kinetic data were fitted to reversible first order, pseudo-first-order, pseudo-second-order, Elovich, intra-particle diffusion and Boyd kinetic models. Process Gibbs free energy (∆G^°), enthalpy (∆H^°) and the entropy (∆S^°) were evaluated. The process was best described by Langmuir isotherm (R² > 0.99; X² ˂ 0.6; SSE ˂ 0.7). Pseudo second order best fitted the kinetic data. The process was spontaneous, feasible and endothermic. 97% optimal removal was achieved at pH 5. Tympanotonos fuscatus extract has potential for application as an effective coagulant while showing significant component of adsorptive phenomenon

KEY WORDS: Paint effluent, Coagulation/flocculation, Adsorption, Tympanotonos fuscatus

Bull. Chem. Soc. Ethiop. 2016, 30(3), 377-390.

DOI: http://dx.doi.org/10.4314/bcse.v30i3.6