Photodegradation of Methylene Blue

Photodegradation of Methylene Blue - 1 Marc Pomi October 7...

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1 Marc Pomi October 7, 2009 Professor Johnson and Professor Oatis Photodegradation of Methylene blue I. Abstract The demonstration of the ability of titanium dioxide to hasten to process of the degradation of toxic organic compounds was examined due to inquires in removing undesirable organic compounds. It was demonstrated that titanium dioxide was a catalyst in the photodegradation of methylene blue using comparative analysis of spectrophotometry. II. Introduction In both drinkable and waste water, there is an increased interest to remove toxic organic substances. Many semiconductors as well as other compounds utilize sun light to catalyze the degradation of organic compounds. Using a spectrophotometer to determine the concentrations of methylene blue the titanium dioxide was greatly reduced (when used in combination with UV light) the concentration of methylene blue from 4 X 10 -5 M to a 0.0378 X 10 -5 M solution. Other attempts using combinations of ultraviolet radiation, hydrogen peroxide, and BaTiO 3 have been used as more effective means of degrading the unwanted substances 1 but, the levels required for the pH for the experiment to be effective would compromise the idea of 1 Madhu, GM and Raj, MALA and Pai, KVK and Rao, S (2007) Indian Journal of Chemical Technology, 14 (2). pp. 139-144. 2 Mathews, R. H. Wat. Res 1990 , 20, 569-578.
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2 removing harmful compounds by making water harmful itself. One useful way to examine the removal of organic substances is to use an organic dye such as methylene blue. Methylene blue has the property of having a high molar absorptivity (ε) which allows it to absorb large amounts of light instead of reflecting it. Titanium dioxide is a suitable semi conductor which can be used in a suspension to see if it aides in the process of photodegradation. A spectrophotometer was
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