Abstract
A study of photocatalytic degradation of the methylene green dye has been carried out in aqueous heterogeneous medium using ZnO as photo-catalyst in a batch reactor. The disappearance of the dye was monitored by spectrophotometric method and found that it follows pseudo-first order kinetics generally according to the Langmuir-Hinshelwood model. The total degradation of dye was studied using chemical oxygen demand (COD) method. The addition of an optimal amount of hydrogen peroxide and potassium persulphate increase the degradation rate while NaCl and Na2CO3 decrease the rate of degradation. The effect of addition of cationic and anionic surfactants has also been investigated. Bubbling of nitrogen in the reaction solution decreases the reaction rate. ZnO has been found experimentally to be a highly efficient photo catalyst for the degradation of methylene green dye.
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