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Photocatalytic reduction of hexavalent chromium in aqueous solutions with zinc oxide nanoparticles and hydrogen peroxide

100%

Assadi A. , Dehghani M. H. , Rastkari N. , Nasseri S. , Mahvi A. H.

Environment Protection Engineering

2012

tom Vol. 38, nr 4

5--16

Photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solutions under UV irradiation and ZnO semiconductor catalyst was investigated using potassium dichromate as a model compound. The effects of pH, catalyst dose (0.05-0.15 g/dm3), Cr(VI) initial concentration (0.1-15 mg/dm3) and hydrogen peroxide concentration on photocatalytic reduction of Cr(VI) were investigated. The reduction rate of chromium was more favorable in acidic solution. Hydrogen peroxide was added as a reduction reagent for enhancement of the photoreduction. The process of photoreduction of Cr(VI) approximately followed first-order kinetics. Drinking water samples and wastewater were collected and photocatalytically treated for reduction of Cr(VI).

Kinetics of degradation of perchloroethylene under ultrasonic irradiation and photooxidation in aqueous solution

72%

Kargar M. , Nabizadeh R. , Naddafi K. , Nasseri S. , Mesdaghinia A. , Mahvi A. H. , Alimohammadi M. , Nazmara S.

Environment Protection Engineering

2013

tom Vol. 39, nr 4

29--38

Sonolysis and photodegradation of various compounds such as chlorinated aliphatic hydrocarbons are the recent advanced oxidation processes. Perchloroethylene PCE is one of these compounds mainly used as a solvent and degreaser. In this work, elimination of perchloroethylene in aqueous solution by ultrasonic irradiation and photooxidation by UVC were investigated. Head space gas chromatography with FID detector was used for analyses of PCE. Results showed that PCE could be effectively and rapidly degraded by ultrasonic irradiation, photooxidation by UVC and combination of these methods. The order of studied reactions for degradation PCE has been determined.