In this paper, the preparation, characterization and dye adsorption properties of
novel biocompatible composite (Chitosan-zinc oxide nanoparticle) (CS/n-ZnO) were investigated.
Zinc oxide nanoparticles were immobilized onto Chitosan. Physical characteristics
of CS/n-ZnO were studied using Fourier transform infra-red (FT-IR), X-ray diffraction
(XRD), scanning electron microscopy (SEM) and wavelength dispersive X-ray spectroscopy
(WDX). Two textile dyes, Direct Blue 78 (DB78) and Acid Black 26 (AB26), were used
as model compounds. The effect of CS/n-ZnO doses, initial dye concentration, salt
and pH were elucidated at 20+/-1 degrees C. The isotherm and kinetics of dye adsorption
were studied. The presence of functional groups such as hydroxyl, amino and carbonyl
groups were detected. Results showed zinc oxide nanoparticles were immobilized onto
Chitosan. The data were evaluated for compliance with the Langmuir, Freundlich and
Tempkin isotherm models. It was found that AB26 and DB78 followed with Langmuir and
Tempkin isotherms, respectively. In addition, adsorption kinetics of both dyes was
found to conform to pseudo-second order kinetics. Based on the data of present investigation,
one could conclude that the CS/n-ZnO being a biocompatible, eco-friendly and low-cost
adsorbent might be a suitable alternative for elimination of dyes from colored aqueous
solutions.