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• W2052223031 endingPage "24589" @default.
• W2052223031 startingPage "24582" @default.
• W2052223031 abstract "Surface modification of TiO2 with CuO or calcium phosphate (CaP) can result in enhancement in the photocatalytic activity for organic degradation. In this work, we report on a synergism between the cation and anion of copper phosphate (CuP) on the photocatalytic activity of TiO2, for phenol degradation in aerated aqueous suspension under UV light at wavelengths longer than 320 nm. Photocatalysts were prepared by mixing TiO2 and CuP powders in isopropyl alcohol, followed by drying at 90 °C. As CuP loading increased, the activity of the modified TiO2 first increased and then decreased. The maximum activity was observed with the catalyst containing 0.1 wt % CuP, which was about 1.9–3.4 times that of bare TiO2 (anatase, rutile, and their mixture) and also exceeded that of the modified TiO2 with CuO or CaP. During five repeated tests, the catalyst activity was stable, without detectable leaching of cupric and phosphate ions into aqueous solution. Solid characterization with several techniques including electron paramagnetic resonance (EPR) spectroscopy revealed that CuP particles at low loading were highly dispersed onto TiO2 as a kind of clusters, whereas the TiO2 phase in different samples remained nearly unchanged in terms of the crystal structure, surface area, and crystallinity. Upon exposure to UV light, the EPR signal of Cu(II) in CuP or CuO-modifed TiO2 was unchanged in air but slightly decreased in N2. Moreover, CuP-modified TiO2 showed a higher capacity than bare TiO2 and CuO- or CaP-modified TiO2 for the uptake of 2,4-dichlorophenol from water. It is proposed that cupric and phosphate ions act as an electron scavenger and organic sorbent, which facilitate electron and hole transfer, respectively. Their co-operation would significantly improve the efficiency of charge separation, and thus increase the rate of phenol degradation." @default.
• W2052223031 created "2016-06-24" @default.
• W2052223031 creator A5003204760 @default.
• W2052223031 creator A5011496607 @default.
• W2052223031 date "2012-11-09" @default.
• W2052223031 modified "2023-10-05" @default.
• W2052223031 title "Cooperative Effect between Cation and Anion of Copper Phosphate on the Photocatalytic Activity of TiO₂ for Phenol Degradation in Aqueous Suspension" @default.
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• W2052223031 doi "https://doi.org/10.1021/jp307240u" @default.
• W2052223031 hasPublicationYear "2012" @default.
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