Preparation and characterization of Cs1·48Sb0·78PMo11VO40. Application to the photo catalytic oxidation of orange II under solar light
Journal of Solid State Chemistry(2021)
Abstract
Cs1·48Sb0·78PMo11VO40 (CsSbPMoV) was prepared and characterized by many physico-chemical techniques. The spectroscopies 31P MAS-NMR, FT-IR) and X-ray diffraction showed that the salt is pure, of Keggin-type crystallizing in a cubic structure.The UV–Vis spectrum revealed the presence of molybdenum and antimony with mixed valence states, Mo(VI)/Mo(V) and Sb(V)/Sb(III). The optical properties showed two transitions: directly (1.20eV) and indirectly (1.38eV) allowed. The intensity-potential (J- E), plotted in Na2SO4 (0.1 M), exhibited a sluggish electrochemical system. The capacitance−2– potential (C−2 - E) curve showed n-type behavior with a flat band potential (Efb) of 0.10 V and a conduction band positioned at 4.65 eV, below vacuum (−0.1 VSCE), composed mostly of (Mo, Sb) 5s wave functions, negative of the •OH/H2O level. Therefore, CsSbPMoV was successfully tested for theoxidation of Orange II (OII), a hazardous dye, by •OH and O2•radicals under solar light. The discoloration obeys a first order kinetic model with an abatement yield of 68% and a photo catalytic half-life (t1/2) of 60 min.
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Key words
Cs1·48Sb0·78PMo11VO40,Photo-electrochemistry,Orange II,Solar light
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