Photocatalytic degradation of textile dye X-3B using polyoxometalate-TiO"2 hybrid materials [An article from: Journal of Hazardous Materials]

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Description:
Titanium dioxide functionalized with Keggin type polyoxometalate (POMs) [X^n^+W"1"2O"4"0]^(^8^-^n^)^- (XW"1"2; X^n^+=P^5^+, Si^4^+, Ge^4^+) were prepared by sol-gel method. The Keggin structure and dispersion state of POMs were monitored by FT-IR and XRD. The composites showed higher photocatalytic activity than pure TiO"2, pure POMs or mechanical mixture of TiO"2 and POMs for X-3B degradation. Among the three POMs-TiO"2 hybrid materials, the reactivity was: PW"1"2>SiW"1"2>GeW"1"2. With different loading weights for the same POMs, the reactivity followed the order: 30wt.%>15wt.%>45wt.%.