【摘要】： 隨著工業(yè)和經(jīng)濟(jì)的發(fā)展,全球環(huán)境污染日益嚴(yán)重,光催化法降解有機(jī)污染物是目前解決這一問題最有效的途徑。半導(dǎo)體催化降解有機(jī)物具有操作簡(jiǎn)便、適用范圍廣、無毒無害、不造成二次污染等優(yōu)點(diǎn),為此越來越受到人們的重視。目前被廣泛研究和應(yīng)用的光催化劑是TiO_2,但TiO_2是間接帶隙半導(dǎo)體,電子躍遷幾率低,在光催化反應(yīng)過程中反應(yīng)速率較慢。與TiO_2相比,ZnO是直接帶隙半導(dǎo)體,有著更高的量子效率;而且ZnO中存在較多的氧空位,能夠形成電子陷阱,因而加速電子-空穴對(duì)的分離,提高光催化活性,這對(duì)于ZnO做為光催化劑的研究具有很強(qiáng)的現(xiàn)實(shí)意義。 本文利用三電極的電化學(xué)沉積系統(tǒng),以ITO導(dǎo)電玻璃為襯底,制備了ZnO納米材料、Mg摻雜的ZnO納米材料及Co摻雜的ZnO納米材料,采用SEM、XRD、EDS、XPS、PL等測(cè)試手段對(duì)樣品的形貌、結(jié)構(gòu)和光學(xué)性質(zhì)進(jìn)行表征,研究了摻雜前后ZnO納米材料對(duì)甲基橙光催化效果的變化,并對(duì)催化機(jī)理進(jìn)行了分析。結(jié)果表明,制備的ZnO納米材料具有良好的晶體質(zhì)量,Mg~(2+)、Co~(2+)已經(jīng)成功摻雜到ZnO晶格中。與未摻雜的ZnO相比,Mg摻雜后的納米ZnO對(duì)甲基橙的光催化效率有很大提高;而Co摻雜的納米ZnO催化效果未見明顯改變。
[Abstract]:With the development of industry and economy, the global environmental pollution is becoming more and more serious. Photocatalytic degradation of organic pollutants is the most effective way to solve this problem. Semiconductor catalytic degradation of organic compounds has many advantages, such as simple operation, wide range of application, non-toxic and harmless, no secondary pollution and so on, so people pay more and more attention to it. At present, the widely studied and applied photocatalyst is TiOCO2, but TiO_2 is an indirect band-gap semiconductor with low electron transition probability and slow reaction rate during photocatalytic reaction. Compared with TiO_2, TiO_2 is a direct band-gap semiconductor with higher quantum efficiency, and there are more oxygen vacancies in ZnO, which can form electron traps, thus accelerating the separation of electron-hole pairs and improving photocatalytic activity. This is of great practical significance for the study of ZnO as photocatalyst. In this paper, ZnO nanomaterials doped with mg and Co doped ZnO nanomaterials were prepared on ITO conductive glass substrate by a three-electrode electrochemical deposition system. The structure and optical properties were characterized, and the photocatalytic effect of ZnO nanomaterials on methyl orange was studied before and after doping, and the catalytic mechanism was analyzed. The results show that the prepared ZnO nanomaterials have good crystal quality, Mg2 and Co2 have been successfully doped into the ZnO lattice. Compared with the undoped ZnO, the photocatalytic efficiency of nanocrystalline ZnO doped with MgO is much higher than that of the undoped ZnO, but the catalytic effect of Co doped ZnO is not obviously changed.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：O614.241;O643.36

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