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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 8, No. 4, 2011, pp. 863-871
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Bioline Code: st11080
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 8, No. 4, 2011, pp. 863-871
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Decontamination of hexavalent chromium and tri-ethyl phosphate stimulants through photacatalytic oxidation
Fathizadeh, M.; Fakhraee, H. & Aroujalian, A.
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.
Keywords
Adsorption; Kinetic reaction rate; Synergetic effect; Ultraviolet / Nano-Titanium dioxide process; Wastewater treatment
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