Journal des effets et du contrôle de la pollution
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P-Nitrophenol: A Model Compound for the Study of Role of PH in the Reaction of Ozone with Phenols

Shanthi S and Yenkie MKN

Best strategies are required to mineralize the extending number of contaminants at low spotlights on the water environment using advanced oxidation process. Phenols, pesticides, composts, chemicals, and other synthetic materials are disposed of direct into nature. Ozonation of refractory aromatic compound p-nitrophenol (PNP) in waste water has been studied in the pH range 4.5-9.2. Ozonation is a straightforward process which can be used for clearing of the phenol at the contaminant destinations or even refinement of defiled water gathered post transfer. Thus, this experimental work provides a solution for pre as well as post disposal removal of nitrophenols. The examination work was finished in a uniformly stirred reactor. Uniform stream of ozone gas and uniform blending was guaranteed, utilizing a polymeric diffuser. The oxidative degradation using O3 was carried out after adjusting the initial pH at room temperature. The degradation rate is found to be optimum (99.95%) at pH 9.2 as a sharp decline in concentration of the substrate was found. The order of reaction was found to be first order at pH values 7 and 9.2, and fractional order (1.5) at pH 4.5. The amount of nitrates formed was also found out. A decrease in the pH value and an increase in the conductivity were also observed, which confirms the formation of acidic by-products.