Authors: Ailton J Moreira Bianca S Pinheiro André F Araújo Gian P G Freschi
Publish Date: 2016/06/11
Volume: 23, Issue: 18, Pages: 18502-18511
Abstract
Atrazine is an herbicide widely used in crops and has drawn attention due to potential pollution present in soil sediment water and food Since conventional methods are not potentially efficient to persistent degradation of organic compounds new technology has been developed to remove them especially practices utilizing advanced oxidation processes AOPs This work aims to evaluate the use of different energies ultraviolet UV microwaves MW and radiations MWUV to the herbicide atrazine through the process of photooxidation These systems found degradation rates of around 12 UV 28 MW and 83 MWUV respectively with time intervals of 120 s After the photolytic processes the samples were analyzed at a wavelength scanning the range of 190 to 300 nm where the spectral analysis of the signal was used to evaluate the degradation of atrazine and the appearance of some other peaks degradation products The spectrum evaluation resulting from photolytic processes gave rise to a new signal which was confirmed by chromatography This spectrum indicated the possible pathway of atrazine degradation by the process of photolytic MWUV generating atrazine2hydroxy atrazinedesethyl2hidroxy and atrazinedesisopropyl2hydroxy The process indicated that in all situations chloride was present in the analytic structure and was substituted by a hydroxyl group which lowered the toxicity of the compound through the photolytic process MWUV Chromatographic analysis ascertained these preliminary assessments using spectrophotometry It was also significantly observed that the process can be optimized by adjusting the pH of the solution which was evident by an improvement of 10 in the rate of degradation when subjected to a pH solution equal to 837The authors are thankful to the Fundação de Amparo a Pesquisa do Estado de Minas Gerais Coordenação de Aperfeiçoamento de Pessoal de Nível Superior CAPES and to the Serviço Nacional de Aprendizagem Industrial de Minas Gerais FIEMG/SENAIMG for their fellowship
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