Oxidation of Cyanuric Acid in Aqueous Solution by Catalytic Ozonation

摘要

The aim of this work was studying the activity of a Ru/CeO2 powder catalyst in the ozonation of aqueous solution of cyanuric acid (CYA). Ozonation in the presence of the catalyst significantly enhances CYA degradation. Within this work, investigation of the influence of pH and initial concentration on the catalytic ozonation of CYA has been done in a semicontinuous reactor. The removing degree of CYA at pH 5.9 show better response in comparison to pH 2.5 and pH 8.2. The mineralization of CYA by catalytic ozonation formed nitrate ions (0.7mol of NO(3)(-/)mol of CYA removed for 50% initial CYA abatement) and nitrite and ammonium ions in small amounts. Three transformation products formed during catalytic ozonation were identified from LC/MS and MS/MS analyses. The impact of oxidation on the toxicity was measured from the inhibition of Vibrio fisheri, which was found to increase continuously.