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Preparation of Pt-TiO2: Produced by illuminating for 4 h a deoxygenated suspension of 100 mg (white) of n-type TiO2 powder (anatase, reagent grade, MCB, particle size 125-250 ¦Ìm) in 20 mL of platinizing solution (H2PtCl6 in dilute HCl, corresponding to 100 mg of Pt) with the white light of a 2500-W xenon lamp, operating at 1600 W, followed by neutralization of the acidic solution, addition of 100 mg of hydroquinone, and 12 h reaction of 50 ¡æ under nitrogen. The now grayish powder was extensively washed with distilled water and dried for 1 hat 120 ¡æ. The distribution of platinum on the TiOp panicle surface was found by electron microscopy to be uniform down to a resolution of <1 ¦Ìm. ÓÐÈË×ö¹ýÕâ¸öÂð,ÈçºÎ²Ù×÷? n-type TiO2 ÊÇʲôÒâ˼? "neutralization of the acidic solution"ÊÇÓÃʲôÀ´ÖкÍ,NaOHÈÜÒºÂð? лл [ Last edited by niejq on 2009-6-2 at 19:06 ] |
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