Kinetics and mass transfer of atrazine ozonation Report as inadecuate




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Roberto José de Carvalho ; Bruno Abreu Calfa ;Ambiente & ÁguaAn Interdisciplinary Journal of Applied Science 2010, 5 (2)

Author: Rafaela Cristina Landeiro da Silva

Source: http://www.redalyc.org/


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Ambiente & Água - An Interdisciplinary Journal of Applied Science ISSN: 1980-993X ambi-agua@agro.unitau.br Universidade de Taubaté Brasil Landeiro da Silva, Rafaela Cristina; de Carvalho, Roberto José; Abreu Calfa, Bruno Kinetics and mass transfer of atrazine ozonation Ambiente & Água - An Interdisciplinary Journal of Applied Science, vol.
5, núm.
2, 2010, pp.
9-20 Universidade de Taubaté Taubaté, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=92815026003 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative ISSN = 1980-993X – doi:10.4136-1980-993X www.ambi-agua.net E-mail: ambi-agua@agro.unitau.br Tel.: (12) 3625-4212 Kinetics and mass transfer of atrazine ozonation (doi:10.4136-ambi-agua.132) Rafaela Cristina Landeiro da Silva1; Roberto José de Carvalho2; Bruno Abreu Calfa3 Departamento de Engenharia de Materiais - PUC-Rio E-mail: 1rafaelalandeiro@yahoo.com.br; 2rjcar@puc-rio.br; 3bacalfa@gmail.com ABSTRACT The kinetics of the atrazine oxidation in aqueous solution by ozone was studied under different initial pH conditions and in the presence of a hydroxyl radical scavenger at pH 2.8. It was verified that the process took place mainly through radical reaction, even in acid medium.
Therefore, a relatively high value of 26.4 L-(mol.s) for the rate constant of the direct reaction between molecular ozone and atrazine was found.
After 10 minutes of oxidation, the degradation of the herbicide was more effective for pH 10.30 than for pHs 6.25 and 2.80.
The mass transfer of ozone from the gas phase to the liquid phase was strongly affected by the oxygen flowrate and to a lesser extent by the stirring speed. Keywords: atrazine; ozonation; kinetics; mass transfer. Cinética e transferência de massa da ozonização da...





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