Kinetic and Isotherm Modelling of the Adsorption of Congo Red Dye onto NiFe2O4 and NiFe2O4 decorated Exfoliated Graphite. Issue 1 (December 2020)

• Record Type: Journal Article
• Authors: Tan, L V; Thinh, P V; Tham, N T H; Sy, D T
• Is Part Of: IOP conference series. Volume 991:Issue 1(2020)
• Publication Date: 2020-12
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/991/1/012085
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Adsorption using novel materials is a common and highly applicable process in remediation of hazardous dyes in wastewater. Herein, we attempted the synthesis of NiFe2 O4 decorated-exfoliated graphite (EG@NiFe2 O4 ), an inexpensive and environmental benign material, and analyzed the adsorption process of the as-synthesized adsorbent against Congo red dye. Kinetic of the adsorption was investigated using various models including first-pseudo kinetic, second-pseudo kinetic, Bangham model and Elovich model. Isotherm of the process was evaluated by Langmuir, Freundlich, Temkin and Dubinin − Radushkevich model. Lastly, thermodynamic parameters of the adsorption towards Congo red dye was calculated. Our findings indicated that kinetic and isotherm of the adsorption process of both adsorbents (EG@NiFe2 O4 and NiFe2 O4 ) could be well explained by the pseudo-second-order model (R 2 > 0.99) and Langmuir isotherm (R 2 =) respectively. In addition, kinetic parameters showed that EG@NiFe2 O4 possesses greater adsorption capacity in comparison with NiFe2 O4 . Estimated thermodynamic parameters also indicated the spontaneous and endothermic adsorption (ΔG=) of the EG@NiFe2 O4 composite against Congo red dye.