Effect of Modifier Agents on Particle Size and Surface Functional Groups of Calcined Eggshell: Test in Adsorption of Remazol Yellow

Abstract

Calcined eggshell (CES) was modified with Pluronic 123 (P123), Pluronic 127 (F127) and polyethylene glycol (PEG) agents and used in adsorption of Remazol Yellow. The adsorbents were characterized by Fourier transform infrared (FTIR) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX). FTIR spectrums showed that characteristic peaks corresponding to CES and modifier agents were observed and CES was successfully modified. Modification of CES with PEG having high chain length (or high molecular weight) positively affected particle size. From EDX analysis was determined the carbon content increased from 21.44 % to 36.60 % whereas the calcium content decreased from 21.23 % to 8.69 % with increasing of the molecular weight of modifier agents. Removal percent of Remazol Yellow was found as 68.55, 91.79, 93.09 and 95.69 for CES, CES-P123, CES-F127 and CES-PEG, respectively. CES-PEG adsorbed Remazol Yellow more than other adsorbents and also dye adsorption on it fitted to Freundlich isotherm model. Dye adsorption capacity of CES-PEG was obtained as 133.3 mg/g. Particle size and carbon content of adsorbents was more effective in adsorption of Remazol Yellow.