Preparation and characterization of Scallop shell coated with Fe3O4 nanoparticles for the removal of azo dye: Kinetic, equilibrium and thermodynamic studies

Shirzad-Siboni, Mehdi ; Mohagheghian, Azita ; Vahidi-Kolur, Robabeh ; Pourmohseni, Melina ; Yang, Jae-Kyu

Abstract

In this study, Scallop shell-Fe3O4 nanoparticles have been used as adsorbents for investigation of the adsorption kinetics, isotherms and thermodynamic parameters of the Acid Red 14 (AR14) from aqueous solutions at various pH, dye concentrations, adsorbent dosages, temperatures and ionic strength. Scallop shell-Fe3O4 nanoparticles are synthesized by co-precipitation method in vacuum condition. Efficient coating of Fe3O4 nanoparticles onto Scallop shell is identified by FT-IR, XRD, SEM, EDX and VSM analysis. Removal efficiency of AR14 by Scallop shell-Fe3O4 nanoparticles is greater than that by Scallop shell-alone and Fe3O4-alone. Maximum adsorption is observed at acidic condition. The removal efficiency of AR14 increased with increasing adsorbent dosage, but decreased with increasing initial AR14 concentration and temperature.The adsorption capacity of AR14 onto adsorbent is little affected by the type of ionic strength except carbonate ion. In kinetic studies, removal rate is better described by the pseudo-second order model than the pseudo-first order model and intra-particle diffusion model. Adsorption isotherm is analyzed by both Langmuir and Freundlich equation. Experimental results reveal that the adsorption reaction is exothermic process. Adsorption efficiency of AR14 by Scallop shell-Fe3O4 nanoparticles is maintained even after six successive cycles.

Keyword(s)

Adsorption; Kinetic; Isotherm; Wastewater; Scallop shell-Fe3O4; Acid Red 14

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