Decoloration study of some synthetic dye solutions by photo Fenton advanced oxidation process Available to Purchase

The increased awareness among the public and strict regulations by the governments to protect the environment from the dire consequences of water pollution has forced the researchers all over the globe to look for such methods which can minimize the ill effects of various forms of water pollution. The effluents released by dyeing industries are one of them. The Advanced Oxidation Processes has found to be superior to the conventionally used technique in decoloration of effluents from the industries which use the vast quantities of synthetic dyes, as they are able to generate extremely reactive OH radicals in abundance. An attempt has been made here to bring about the decoloration of solutions of commercially used dye namely Malachite Green using photo Fenton’s process. This process comprises of hydrogen peroxide and Fe²⁺ in the presence of UV radiations. The blend of UV radiations with Fenton’s reagent is found to augment the rate as well as the extent of decoloration of dye solutions which may be attributed to the formation of additional OH radicals by multiple pathways. An additional equivalent of OH radicals are produced as a outcome of photolytic conversion of Fe3⁺(produced due to reaction of H₂O₂ with Fe²⁺ions) to Fe²⁺. The dye degradation and subsequent decoloration by this process has been found to be affected by various parameters such as the initial dye concentration, extent of H₂O₂ and Fe²⁺ ions and the intensity of radiations. The method is more advantageous owing to comparatively low Fe²⁺ concentration, high degradation rate, low operation cost etc. in comparison to classical Fenton-Reaction.