Competence kinetic and thermodynamic studies between natural bio-adsorbent green microalgae and synthetic adsorbent magnetic nanoparticles for copper(II) ion in water

ABSTRACT. The present work investigated the kinetic and thermodynamic study of adsorbents to remove copper ions from aqueous solutions compared efficiency between natural microalgae bio-adsorbent chlorella species (sp.) synthetic magnetic nanoparticles. All materials synthesized characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), energy dispersive X-ray (EDX). highest Cu+2 ion adsorption for solution at 100 mg/L was 57.2%, while pH 8 it 59.7%. more efficient adsorbent acquired 0.24 mg/g. second-order model is fitted, activation (Ea) three adsorbents; Chlorella, Fe3O4, (Fe3O4 coated with SiO2) were 95.24, 40.69, 20.39 kJ/mol, respectively indicating process slower than Enthalpy changes (ΔH#) endothermic showed that on chemisorption nanoparticles physisorption. Entropy change (ΔS#), Gibbs free (ΔG#) feasible spontaneous in temperature range 293-313 K. novelty this determine type algae nanoparticles.
 
 KEY WORDS: Adsorption, Kinetic models, Thermodynamic studies, Chlorella species, Magnetic nanoparticle, Efficiency percent
 Bull. Chem. Soc. Ethiop. 2023, 37(1), 183-196. DOI: https://dx.doi.org/10.4314/bcse.v37i1.15