Fabrication of novel chitosan-humic acid-graphene oxide composite to improve adsorption properties for Cr(VI)

  • Şerife Parlayıcı
  • Ahmet Avcı
  • Erol PehlivanEmail author
Original Paper


A novel chitosan-humic acid-graphene oxide (Cts-HA-GO) composite was produced and tested to remove hexavalent chromium (Cr(VI)) during the adsorption process. The percentage adsorption was 85.28% by using 200 ppm Cr(VI) and 2 g/L composite. Four hours of contact time was enough to remove Cr(VI) from the aquatic medium. The extent of adsorption of Cr(VI) on the surface of Cts-HA-GO composite was examined on the basis of increasing quantity of the composite. The functional group characterization and morphology of composite was characterized using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. After reaching the equilibrium, the residual concentration of the Cr(VI) solution was measured with an UV-visible spectrophotometer. The results showed that the adsorption behaviour was in accordance with the Langmuir isotherm model, and the maximum adsorption capacity of Cr(VI) determined by using this model was 83.64 mg/g at the pH of 2. A pseudo-second-order model equation has justified the equilibrium between Cr(VI) and the composite for the kinetic studies.

Graphical abstract


Humic acid Graphene oxide Chitosan Cr(VI) removal Kinetics Composite 



Chitosan-humic acid-graphene oxide

Cr (VI)

Hexavalent chromium

Cr (III)

Trivalent chromium




Graphene oxide


Humic acid


Energy-dispersive X-ray


Scanning electron microscopy


Fourier-transform infrared spectroscopy


X-ray diffraction

D-R isotherm

Dubinin-Radushkevich isotherm


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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKonya Technical UniversityKonyaTurkey
  2. 2.Department of Biomedical EngineeringNecmettin Erbakan UniversityKonyaTurkey

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