Abstract
The dilacunary decatungstogermanate [γ-GeW 10O 36] 8− (GeW 10) and the monolacunary undecatungstogermanate [β 2-GeW 11O 39] 8− (GeW 11) were employed as polyanions to layer-by-layer self-assembly with cationic thionine (TH) dye. The (GeW 10/TH) n and (GeW 11/TH) n composite films were characterized by UV–vis spectra, atomic force microscopy images (AFMs) and cyclic voltammograms (CV). Their photocatalytic activities were evaluated by photocatalytic degradation of methyl orange aqueous solution under sunlight irradiation. The results indicated that the (GeW 10/TH) n and (GeW 11/TH) n films exhibited the sunlight photocatalytic activities for methyl orange (MO) solution. The dye molecule TH extended the light absorption spectrum of polyoxometalates toward the visible light region. The photocatalytic mechanism of composite films was also discussed.
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