Effect of pH to the Decomposition of Aqueous Phenols Mixture by Ozone
The degradation of the mixture of phenol and its chlorinatedderivatives with ozone is studied. The studied compounds are phenol(Ph), 4 chlorophenol (4-CPh) and 2,4 dichlorophenol (2,4-DCPh). The kinetic performances of each phenolic compound in themodel mixture are examined. The pH influence to...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | México |
| Institución: | Instituto Politécnico Nacional |
| Repositorio: | Redalyc-IPN |
| OAI Identifier: | oai:redalyc.org:47550106 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=47550106 |
| Access Level: | acceso abierto |
| Palabra clave: | Multidisciplinaria (Ciencias Naturales y Exactas) pH water phenols ozonation decomposition |
| Sumario: | The degradation of the mixture of phenol and its chlorinatedderivatives with ozone is studied. The studied compounds are phenol(Ph), 4 chlorophenol (4-CPh) and 2,4 dichlorophenol (2,4-DCPh). The kinetic performances of each phenolic compound in themodel mixture are examined. The pH influence to the decompositiondynamics for different phenolic compounds in the range 2 12 isinvestigated. The increase of the decomposition rate under the pHincreasing was observed. In the studied pH range, phenol andchlorophenols ozonation proceeds rapidly. The UV absorvency isused for the preliminary control of the phenols decomposition degree.The HPLC analysis was used to identify intermediates and final productsformed during ozonation of the phenols mixture. It is shown thatthe basic intermediates are muconic and fumaric acids, malonic andmaleic acids, catechol and hydroquinone. The final products are oxalicacid and formic acid. In the case of alkaline media, the principalfinal product is oxalic acid. Furthermore, intermediates and finaldecomposition products obtained at the different pH are compared.According to the obtained results, the possible mechanism of ozonationby the reaction of hydroxylation and dechloration in the earlystage is proposed. The BOD5/COD ratio is used as a biodegradabilitymeasure for the comparison of biodegradability of initial compoundsand final products composition. |
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