Investigation of removal efficiency of Cr (VI) from industrial wastewater using chitosan and synthesized chitosan nanoparticles

Document Type : Original Research Paper


1 Department of Chemical Engineering, Islamic Azad University, Ayatollah Amoli Branch, Amol, Iran

2 2 Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Science, Babol, I.R.Iran. 3 Full professor of Clinical Biochemistry, Department of Clinical Biochemistry, School of Medicine, Babol University of Medical Sciences, Babol, Iran.

3 Department of Chemical Engineering, Islamic Azad University, North Tehran Branch, Tehran, Iran



Chromium (VI) is present in the effluents from different industries which may
cause serious environmental problems. The aim of this study was to synthesis of
chitosan nanoparticles and their comparison with chitosan for removal of Cr (VI)
ions from industrial waste water. The Synthesizing of the nanoparticle adsorbents
was successfully done by the crosslinking method. The nanoparticles sizes were
determined between the ranges of 50-100 nm. The effect of the pH solution,
adsorbents dosage, initial concentration of chromium ion and contact time
for the absorption of Cr (VI) were investigated by means of atomic absorption
spectroscopy. Maximum adsorption of chitosan nanoparticles and chitosan were
44 & 16 mg/g, respectively (p <0.001). The optimum conditions for removal of
Cr (VI) were determined to be pH=5 for nanochitosan solution, 1gr/L of the
initial concentration of metal ion, adsorbents dosage of 0.125 g/L and the
3-hour contact time. The results showed that nanochitosan possesses a higher
absorption capacity for Cr (VI) compared to the chitosan, which related to the
increase in the nanochitosan effective surface.