Agricultural Waste as Adsorbent for Removal of Chromium (VI) from Aqueous Solution

Authors

  • Ahmad Reza Yari Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran
  • Ali Joghataei Student Research Committee, Qom University of Medical Sciences, Qom, Iran
  • Davoud balarak Department of Environmental Health, Health Promotion Research Center, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran
  • Ferdos Kord Mostafapour Department of Environmental Health, Health Promotion Research Center, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran
  • Yousef Mahdavi Department of Environmental Health, Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
Abstract:

Background & Aims of the Study: Since the chromium (VI) is a toxic, carcinogenic and non-biodegradable element and can accumulate in the tissues, the presence and release of this element through the effluents is associated with dangerous effects on life cycle. Thus, it should be removed from the effluents. In the present study, biosorption of Cr(VI) from aqueous solutions using Rice husk was investigated. Materials and Methods: The various parameters such as pH, initial Cr(VI) ion concentration, adsorbent dose, and contact time were optimized in batch adsorption system. The experimental data were modeled by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The pseudo-first order, pseudo-second order and intraparticle diffusion models were used to describe the kinetic data. Results: The results indicated that Cr(VI) removal efficiency increases by increasing of contact time and adsorbent dosage. Langmuir models demonstrated the best fit of the adsorption data. The maximum adsorption capacity was 38.4 mg/g at optimum conditions of pH 5.0, contact time of 75 min, temperature of 30 ◦C and biomass dose of 5 g/L. The best correlation was provided by the second-order kinetic model. Conclusion: It can be concluded that the Rice husk can be considered as an effective adsorbent to remove the Cr(VI) from aqueous solution.

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Journal title

volume 5  issue 4

pages  310- 318

publication date 2016-09

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