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Decontamination of hexavalent chromium and tri-ethyl phosphate stimulants through photacatalytic oxidation

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Abstract

In this paper, the photocatalytic decontamination of hexavalent chromium and tri-ethyl phosphate, two important wastewater contaminants, are studied by the ultraviolet / nano-titanium dioxide process. The pH value and synergic effect between the oxidation of tri-ethyl phosphate and the reduction of hexavalent chromium were investigated in different concentrations of tri-ethyl phosphate and hexavalent chromium. Furthermore, the effects of ultraviolet and nano-titanium dioxide were investigated in a solution which contained tri-ethyl phosphate and hexavalent chromium. Results of adsorptions showed that hexavalent chromium was adsorbed better in acidic pH while the better adsorption for tri-ethyl phosphate was occurred in alkalinity pH. The reduction rate of hexavalent chromium was higher in acidic solutions while it was obtained at natural pH for tri-ethyl phosphate. In co-adsorption of hexavalent chromium and triethyl phosphate pollutants, tri-ethyl phosphate slightly increased adsorption of hexavalent chromium, but hexavalent chromium had no influence on the adsorption of tri-ethyl phosphate on nano-titanium dioxide particles. In contrast, triethyl phosphate has an improving effect on the reduction reaction rate of hexavalent chromium which increases with the interaction of the concentration of tri-ethyl phosphate in mixture. The same is true for the oxidation rate of tri-ethyl phosphate.

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Authors and Affiliations

  1. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

    M. Fathizadeh Ph.D.

  2. Department of Civil Engineering, University of Science and Technology, Tehran, Iran

    H. Fakhraee (Associate Professor)

  3. Department of Chemical Engineering, Food Process Engineering and Biotechnology Research Center, Amirkabir University of Technology, Tehran, Iran

    A. Aroujalian (Professor)

Authors
  1. M. Fathizadeh Ph.D.
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  2. H. Fakhraee
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  3. A. Aroujalian
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Correspondence to A. Aroujalian.

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Fathizadeh, M., Fakhraee, H. & Aroujalian, A. Decontamination of hexavalent chromium and tri-ethyl phosphate stimulants through photacatalytic oxidation. Int. J. Environ. Sci. Technol. 8, 863–871 (2011). https://doi.org/10.1007/BF03326269

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  • DOI: https://doi.org/10.1007/BF03326269

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