Degradation Rules Of Organic Compounds By Potassium Permanganate Oxidation

A wide variety of organic compounds is difficult to treat. Withfurther research and development, advanced oxidation method hasbecome one of the most efficient ways to treat organic wastewater.Potassium permanganate oxidation has a strong oxidizing ability and issimple to operate. This paper studies degradation rules of organiccompounds by potassium permanganate oxidation in order to predict theremoval effect of new pollutants.To study the degradation rules of organic compounds under differentpH conditions.22kinds of organic compounds including aniline,nitrobenzene, phthalic acid, indigo etc. were selected. Total organiccarbon (TOC), Ultra-violet and visible spectrophotometer and Highperformance liquid chromatography (HPLC) were selected to analyze theexperimental data. The reaction kinetic was discussed. Gaussian09(DFT-B3LYP) was one of the quantum chemistry methods. It was used toanalyze the relationship between the removal ratio and quantumdescriptors. Gas Chromatohraph-Mass Spectrum (GC-MS) was used toanalyze reaction mechanisms and paths of organic compounds. Theresults are as follows:(1)It is shown that TOC removal ratio of phenols is over60%whilethat of other compounds is less than40%. Most of the tested compounds can obtain a better TOC removal ratio under alkaline conditions. Thecolor removal ratio of all the compounds is over90%. The chromaticitycan be quickly and efficiently removed by potassium permanganatemethod. Some color removal reaction can be completed in a short time(0~5min). The reaction is not affected by pH conditions. The HPLCresults indicate that the removal ratio of2,4-dichlorophenol,2,4-dichloro-aniline,5-chloro-2-methyl aniline, phloroglucinol andaniline is higher than that of nitrobenzene and phthalates. Most of thetested compounds can obtain a higher removal ratio under alkalineconditions.(2) Bond orders (C-C)maxis more related with K (Kcolour, KHPLC) thanother descriptors; Fukui indices including Fukui(-)min, Fukui(0)min,Fukui(0)max, Fukui(+)min, Fukui(+)maxand Fukui(-)maxis more relatedwith KTOCthan other descriptors.(3)It is shown that from the GC-MS results the active sites of anilineis N-H bond on the amino group, followed by the benzene ring on theC-H. It also explains the reason for the lowest removal ratio ofnitrobenzene under three pH conditions. Potassium permanganate isdifficult to attack nitrobenzene ring and the degradation process isbasically not affected by pH.