STUDY ON THE ADSORPTION OF REACTIVE ORANGE RO122 FROM AQUEOUS SOLUTION ONTO CROSSLINKED CHITOSAN-COATED DIATOMITE

Abstract

The preparation, characterization and RO122 adsorption of crosslinked
chitosan coated diatomite (CS-GLA/DM) were investigated. The prepared
crosslinked chitosan-coated diatomite was characterized using Fourier transform
infrared (FT-IR) spectroscopy and Scanning electron microscope (SEM)
techniques. The influences of sorbent dosages, pH, reaction time, reaction
temperature and adsorption isotherms were studied. The optimum conditions
for RO122 adsorption were pH 1.0, contact time of 50 mins with 0.2g of
crosslinked chitosan coated diatomite. The maximum adsorption rate reached to
99.4%. Langmuir and Freundlich adsorption model were applied to describe the
equilibrium isotherms. The equilibrium data were found to be fitted well to
Langmuir isotherm and the maximum adsorption capacity was determined to be
163.9mg/g. The results suggested that crosslinked chitosan coated diatomite
was a promising sorbent to remove dyes in textitle wastewater.