The Investigation of color removal by Photocatalytic and Chemiicall Oxiidattiion of Red Reacttiive Texttiille Dye

A. Habeeb, Hassan

	The Investigation of color removal by Photocatalytic and Chemiicall Oxiidattiion of Red Reacttiive Texttiille Dye
journal of al-qadisiyah for pure science(quarterly)
Article 1, Volume 7, Issue 2, 2007, Pages 96-107 PDF (0 K)
Author
Hassan A. Habeeb
Abstract
The photocatalysis and other advanced oxidation processes (AOPs) have been used to investigate the degradation of red reactive textile dye in aqueous solutions via exposing to direct sun-light for 24 hours in direct sun light. Results showed that photocatalysis (TiO2 and ZnO suspensions) processes were more effective than photochemical (Fe+2/H2O2) and H2O2 and chemical (Fe+2/H2O2) oxidation. The best value of degradation reached 75% mineralization, which was achieved with ZnO / dye suspension (1 gm/l). The concentration of dye was measured in the ëmax of UV-visible spectrum of dye (715nm). The work involves the studying of kinetics of photodegradation of dye by using UV light emitting from medium pressure mercury lamp at 365 nm and 25Co in the stable light intensity and presence of TiO2 and ZnO catalysts, it has been found that the photodegradation constant of aqueous solution of dye (100mg/l) was 2.01x10-4sec-1 and 1.82x10-4sec-1 respectively. It was also found the initial rate of photodegradation of dye increases as its initial concentration increases which was higher in the presence of TiO2.The adsorption constant and reaction rate constant of dye over TiO2 and ZnO in same conditions was (25.2mg/l and 2.63x10-2 mg/l.s) for TiO2 and (18.2 mg/l and 2.22x10-2 mg/l.s) for ZnO respectively.

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