11.  Photodegradation of Isoproturon in Water by Several Adavanced Oxidation Processes

Authors: Bobu Maria Magdalena, Siminiceanu Ilie, Lundanes Elsa


Abstract:

The paper deals with the study of the Isoproturon degradation and mineralization in water by four Advanced Oxidation Processes (AOP): UV/H2O2, UV/H2O2/Fe(II) (photo-Fenton), UV/TiO2, and UV/H2O2/TiO2 (anatase). All the degradation experiments have been done in a quartz glass photoreactor (V= 0.5 L ) equipped with a UV lamp having an incident photonic flux of 5x10-6 Es/s. The initial concentration of the Isoproturon aqueous solution was 5x10-5 mol/L. The concentrations of the unreacted substrate and of some intermediates have been determined by HPLC analysis. The Total Organic Carbon (TOC) measurements have been performed with a TOC analyzer Shimadzu model TOC 5000A. The optimal parameters have been identified for each process. The main conclusion from the obtained results is that the most effective is the photo - Fenton process. Using doses of 0.5 mmol/L H2O2 and 0.05 mmol/L Fe (II) the Isoproturon is almost completely removed after only 15 minutes, while TOC is reduced by 88.78 % after 60 minutes of irradiation.


Keywords: Isoproturon photodegradation, photoreactor, AOP comparison, water treatment

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