Investigation of boron adsorption by graphene oxide: equilibrium, kinetic, and thermodynamic studies

Mehmet Fatih Önen; Nalan Erdöl Aydin; Osman Eksik; Pelin Demirçivi; Gülhayat Nasun Saygili

doi:10.55730/1300-0527.3568

Investigation of boron adsorption by graphene oxide: equilibrium, kinetic, and thermodynamic studies

Turk J Chem. 2023 May 27;47(3):656-666. doi: 10.55730/1300-0527.3568. eCollection 2023.

Authors

Mehmet Fatih Önen¹, Nalan Erdöl Aydin¹, Osman Eksik², Pelin Demirçivi³, Gülhayat Nasun Saygili¹

Affiliations

¹ Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, İstanbul Technical University, İstanbul, Turkey.
² Institute of Nanotechnology, Gebze Technical University, Gebze, Turkey.
³ Yalova University, Engineering Faculty, Chemical Engineering Department, Yalova, Turkey.

Abstract

Graphene oxide, which has a great application in industry, is one of the promising carbonous materials. Modified Hummers method was applied to synthesize graphene oxide. Characterization techniques showed that pure graphene oxide was successfully obtained. Its adsorptive properties were investigated by boron adsorption. The results were demonstrated that boron adsorption on graphene oxide was a pH-dependent process and maximum adsorption was achieved at pH 6 (0.98 mg g^-1). Langmuir adsorption capacity was calculated as 3.92 mg g^-1 with R² = 0.99. The kinetic data brought to light that pseudosecond-order kinetic model was well described the experimental data (R² = 0.99), and according to thermodynamic parameters, boron adsorption has spontaneous and endothermic nature (ΔH°=15.47 kJ mol^-1).

Keywords: Graphene oxide; adsorption; boron; wastewater.