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Published on: January 17, 2017
Layer-by-layer self-assembly polytungstogermanate multilayer films and their photocatalytic properties under sunlight
Shuiying Gao1, Danmei Pan, Rong Cao
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou 350002, China.
Abstract:
The dilacunary decatungstogermanate [γ-GeW(10)O(36)](8-) (GeW(10)) and the monolacunary undecatungstogermanate [β(2)-GeW(11)O(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.
