Decolourization of Reactive Dye by Catalytic Ozonation based Advanced Oxidation Process in the Presence of Nano Gypsum

<p>Synthetic dye wastewater released into water bodies from industrial units such<br>as textile manufacturing, dyeing and printing etc causes a negative<br>environmental impact. Dye pollution poses significant environmental and health<br>concerns. There are many methods available to treat dye wastewater such as<br>adsorption, ion exchange, membrane process, coagulation and flocculation etc.,<br>still Advanced Oxidation Process is considered to be the best vowing to its<br>broad applicability, complete mineralization, low sludge generation,<br>decomposition of intermediates, non-selective reactivity etc,. In present study<br>Catalytic Ozonation, an Advanced Oxidation Process was used to decolourise<br>C. I. Reactive Blue - 5, a persistence dye using a nanocatalyst named nano<br>gypsum. Nano gypsum was prepared and characterized using TEM and XRD<br>studies. The average particle size of nano gypsum was found to be 25nm. The<br>effect of various parameters such as catalytic dosage, contact time, ozone flow<br>rate, solution pH and initial concentration on the removal of dye were studied.<br>The maxiumum dye colour removal of 96.7% was achieved in presence of<br>ozone and nano gypsum catalyst at dosage of 1.5 g/L, pH of 8, contact time of<br>30 min and flow rate of 3 L/min.</p>