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- 저자 : Kandiel, Tarek A. (검색결과 1 건)
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Kandiel, Tarek A.,Dillert, Ralf,Bahnemann, Detlef W. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.5
Titanium dioxide was modified with Pt-polypyrrole nanocomposites through the in situ simultaneous reduction of Pt(IV) and the oxidative polymerization of pyrrole monomers at ambient temperature. The modified powders were characterized using X-ray photoelectron spectroscopy (XPS), dark-field scanning transmission electron microscopy (DF-STEM), infrared spectroscopy (IR) and by the determination of the BET surface area by nitrogen adsorption. Photocatalytic hydrogen production tests were performed employing 75 ml aqueous solution containing $2250\;{\mu}mol$ methanol as the sacrificial electron donor. The obtained results show that 0.5 and 1.0 wt% Pt and polypyrrole, respectively, are the optimum ratios for high photocatalytic $H_2$ production rates. The amount of $H_2$ evolved during 5 h of UV-vis illumination of the suspension of Pt-polypyrrole modified $TiO_2$ powder is three times higher than that obtained with Pt-loaded $TiO_2$ prepared by a photochemical deposition method. The photonic efficiencies of the $H_2$ production employing 75 ml aqueous solution containing 370 mmol methanol were calculated to be $10.6{\pm}0.5$ and $4.5{\pm}0.2%$ for $TiO_2$ modified with Pt-polypyrrole nanocomposites and for Pt-loaded $TiO_2$ prepared by a photochemical deposition method, respectively. A synergistic effect between Pt nanoparticles and polypyrrole leading to a better separation of the charge carriers is proposed to explain the enhanced reactivity of the newly synthesized photocatalyst.
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