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Preparation, Characterization and Photocatalytic Activity of Pt-SiO2/TiO2 with Core-Shell Structure
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Preparation, Characterization and Photocatalytic Activity of Pt-SiO2/TiO2 with Core-Shell Structure
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National Natural Science Foundation of China (20801023); Youth Foundation of Jinan University (51208024)

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    摘要:

    以直徑300 nm左右的SiO2微球?yàn)楹?，采用溶膠-凝膠法制備了SiO2/TiO2核殼結(jié)構(gòu)光催化劑，并以化學(xué)還原法對(duì)其進(jìn)行Pt沉積。采用XRD、XPS、TEM、DRS、PL對(duì)制備樣品進(jìn)行表征。結(jié)果表明，Pt主要以Pt(0)形式存在，不均勻地分布在SiO2/TiO2表面。Pt的沉積使得光催化劑在可見光區(qū)域的光吸收增強(qiáng)，電子與空穴分離效率明顯提高。測(cè)定了羅丹明B在不同光催化劑上的吸附常數(shù)。結(jié)果表明，核殼結(jié)構(gòu)有利于羅丹明B在光催化劑表面的吸附，沉積Pt可顯著提高光催化降解反應(yīng)的動(dòng)力學(xué)常數(shù)。Pt的最優(yōu)沉積量為0.5%

    Abstract:

    SiO2/TiO2 photocatalyst with core-shell structure were synthesized by sol-gel method, using SiO2 microsphere with a mean size of about 300 nm as template. And then Pt was deposited on SiO2/TiO2 by chemical reduction method. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectra (PL). The results show that Pt particles mainly in form of Pt(0) can be deposited on SiO2/TiO2 surface un-uniformly. The absorption in visible light region and the separation efficiency of electron-hole pairs are enhanced obviously via Pt-deposition. The adsorption and kinetic constants of Rhodamine B (RB) over the obtained samples were evaluated. The results indicate that core-shell structure is helpful to improve the adsorption property. The presence of Pt on SiO2/TiO2 surface is found to significantly enhance the photodegradation of RB, and the optimal deposition of Pt is 0.5 wt%

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黃浪歡,王后錦,劉應(yīng)亮,陳彩選. Preparation, Characterization and Photocatalytic Activity of Pt-SiO2/TiO2 with Core-Shell Structure[J].稀有金屬材料與工程,2011,40(11):1901~1905.[Huang Langhuan, Wang Houjin, Liu Yingliang, Chen Caixuan. Preparation, Characterization and Photocatalytic Activity of Pt-SiO2/TiO2 with Core-Shell Structure[J]. Rare Metal Materials and Engineering,2011,40(11):1901~1905.]
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  • 收稿日期:2010-11-20
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