Study On The Photocatalysis Of Prussian Blue

In this work, the organic compound Rhodamine B (RhB) was degraded by a heterogenou photo-Fenton reagent Prussian blue under visible irradiation and neutral medium, the result indicated that the degradation process obeyed the pseudo-first reaction model. The oxidation rate accelerated in the case that the inorganic electrolyte KCl was added in. This phenomenon has not been reported until now.Furthermore, the reaction mechanism was investigated. Organic compound Rhodamine B (RhB), Malachite Green (MG) and Methyl orange (MO) were selected as degradation object, in the presence of SO₄^2-, Br^-, Cl^- and NO₃^-, the reaction involving K⁺ always showed more efficiency than the one involving Na⁺. The reaction rate improved as the concentration of K⁺ increased. Cyclic Voltammetry was conducted in the solution of alkaline metal cations K⁺, Na⁺, Rb⁺ and Cs⁺. Results showed that the peak current at 0.2 V in K⁺ was higher than other cations, which was determinated by the structure of Prussian blue. The order of peak current at 0.2 V was in agreement with the degradation rate of these specie. The reaction mechanism was put forward, the flow of K⁺ is a key factor for the efficiency of the degradation in Prussian blue system.Pussian blue was loaded on the zeolites to remediate the organic compound RhB and MG, the catalysis efficiency obtained was better. The degradation process obeyed the law of the pseudo-first reaction model.