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Journal Article 
Comparison and understanding of the different simulated sunlight photocatalytic activity between the saturated and monovacant Keggin unit functionalized titania materials 
Ma, F; Shi, T; Gao, Jie; Chen, L; Guo, Wan; Guo, Y; Wang, S 
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757 
The saturated and monovacant Keggin unit functionalized
titania materials, H3PW12O40/TiO2 and K7PW11O39/TiO2, were prepared by one step sol-gel co-
condensation followed by solvothermal treatment. The structure, optical absorption properties,
morphology, and porosity of the materials were well characterized. Subsequently, their simulated
sunlight photocatalytic activity was evaluated by the degradation and mineralization of dye
rhodamine B (RB) and endocrine-disrupting chemical diethyl phthalate (DEP). Special attention was
paid to provide direct evidences for the explanation of the different photoexcited electron-hole
pair separation rates of the H3PW12O40/TiO2, K7PW11O39/TiO2, and pure TiO2 by the
photoelectrochemical experiment: simultaneously, the target active species yielded in the
K7PW11O39/TiO2- and H3PW12O40/TiO2-catalyzed DEP degradation systems were also investigated by
the free radical and hole scavenging experiment. Accordingly, reasons for the photocatalytic
activity difference between the K7PW11O39/TiO2 and H3PW12O40/TiO2 as well as pure TiO2 were
revealed. (C) 2012 Elsevier B.V. All rights reserved. 
Polyoxometalates; Titania; Composite material; Synergistic photocatalytic effect; Simulated sunlight photocatalysis 
• Diethyl phthalate (DEP)
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