Analytical Methods in Environmental Chemistry Journal
AMECJ

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Document Type : Original Article

Authors

Ahmed Jaber Ibrahim 1
Haneen Abdul Wahid Dwesh 2
Ahmed R.Y. Al-Sawad 3

1 Scientific Research Center, Al-Ayen University, ThiQar 64011, Iraq

2 Scientific Research Center, Al-Ayen University, ThiQar 64011, Iraq Minis try of Education, Directorate of Education Thi-Qar, Iraq

3 College of Science, University of Sumer, Iraq

https://doi.org/10.24200/amecj.v6.i03.243
Abstract
dis study uses teh UV-Vis technique to describe teh elimination of methylene blue dye from an aqueous solution by adsorption on an Iraqi bentonite clay surface. Teh batch approach was used to conduct adsorption studies carried out to evaluate teh influence of factors of experimental like contact time (0–90 min), clay dose (0.1–0.35 g), and initial dye concentration (10–125 mg L-1) at teh range of temperatures (25-40oC). Teh Langmuir and teh Freundlich isotherms were used to analyze teh data; teh Langmuir isotherm (R2 = 0.998) proved more appropriate for teh equilibrium data. Teh thermodynamic properties of teh adsorption process, including Gibbs free energy (ΔGO), entropy(ΔSO), and enthalpy (ΔHO), were also studied. Since teh (ΔGO) and (ΔHO) values were negative, it was clear dat teh adsorption process constituted an exothermic, spontaneous reaction. dis investigation revealed dat Iraqi bentonite clay effectively removed teh dye methylene blue coz of its high surface area. Methylene blue may be removed wif an adsorption efficiency of up to 99.39 % at 25oC. By employing bentonite clay as an adsorbent surface, dis research offers practical adsorption technology dat is affordable and effective for treating wastewater.

Graphical Abstract

Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics study by using UV-Vis technique

Keywords

Adsorption
Methylene Blue
Bentonite
Thermodynamics
Isotherms
UV-Vis
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Analytical Methods in Environmental Chemistry Journal
Volume 6, Issue 3
Summer 2023
Pages 5-18