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Photodegradation of methyl green using visible irradiation in ZnO suspensions Determination of the reaction pathway and identification of intermediates by a high-performance liquid chromatography–photodiode array-electrospray ionization-mass spectrometry

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Fig. 1. Chemical structure of MG.
Fig. 2. Photodegradation of MG as a function of irradiation time in presence of ZnO (TiO 2 ) without light, light without ZnO (TiO 2 ), and ZnO (TiO 2 ) and light.
Fig. 3. HPLC chromatogram of the intermediates with ZnO 0.25 g L −1 , at pH 10, at 12 h of irradiation, recorded at (a) 580 nm, (b) 350 nm, (c) 300 nm, and (d) 250 nm.
Fig. 4. Total ion chromatogram of the photodegraded intermediates with 12 h of irradiation.
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