Evaluation of Removal Efficiency of Cr (VI) Ions from Aqueous Solution Using Chitosan

Subject Areas : Journal of Chemical Health Risks

Soheil  Sobhanardakani ¹ (Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran)
Raziyeh  Zandipak ² (Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran)
Mohadeseh  Bonyadi ³ (Department of Fisheries, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran)
Hassan  Parvizimosaed ⁴ (Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran)
Mehran  Moslemi ⁵ (Department of Fisheries, Jouybar Branch, Islamic Azad University, Jouybar, Iran)
Mahsa Tahergorabi  Tahergorabi ⁶ (School of Public Health, Kerman University of Medical Sciences, Kerman, Iran)
Seyed Mehdi  Hosseini ⁷ (Department of the Environment, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran)

Received: 2015-02-15 Accepted : 2018-10-29 Published : 2018-10-29

Keywords: Cr (VI) ions Chitosan Adsorption Removal efficiency,

Abstract :

In this research, chitosan was used for the removal of Cr (VI) ions from aqueous solution. The effect of parameters like solution pH, initial Cr (VI) concentration, agitation time, amount of adsorbent and agitation speed on the adsorption process was studied. The experimental equilibrium data were analyzed by using various models such as Langmuir and Freundlich. Freundlich isotherm model fitted well with data. In addition, the experimental data was fitted to kinetic models including the pseudo-first-order and pseudo-second-order and based on calculated respective parameters such as rate constants, equilibrium adsorption capacities and correlation coefficients. The removal process follows the pseudo-second-order kinetic model. The results suggest that chitosan could be employed as a low-cost material for the removal of Cr(VI) ions from aqueous solutions.   

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