纳米铜复合氧化物的制备和性能

摘要采用溶胶凝胶法以及前驱体法制备纳米级CuAl2O4 粉末，另外采用聚（乙二醇）（PEG）辅助湿化学方法合成了15~ 20纳米介孔结构的纳米Cu2O/PEG400复合空心球（HSS，直径50〜80纳米的）。用透射电镜和XRD等方法对材料的结构、形貌进行分析与表征。64034

结果表明：CuAl204为尖晶石型结构，呈现球型颗粒状，粒径大约为10～30 nm。利用紫外一可见漫反射吸收光谱，得到吸收极限波长约为700 nm，计算得到禁带宽度为1．77 eV。在荧光汞灯(λ>400 nm)照射下，纳米CuAl204粉体对甲基橙的2 h脱色降解率均可达到90％左右。通过紫外光、荧光汞灯等不同光照条件对甲基橙的光催化降解的比较表明：CuAl204光催化剂具有优异的可见光催化活性。在纳米Cu2O复合材料的中空纳米结构中，纳米晶粒径和孔隙直径为约 5和4纳米。聚乙二醇（PEG400）（PEG-400），以及分子自组装形成的胶束成了形成的中空结构的模板并制造过程中产生了中空结构，。聚乙二醇在本次试验中作为还原剂，溶剂，络合剂。介孔结构的形成得益于复合纳米粒子的面向聚合。该纳米复合材料在414和436 nm的峰和454，570，和637纳米峰谷位置表现出特殊的光致发光（PL）现象。此外，得益于他们的复合材料和介孔壳结构，该复合材料也表现出对甲基橙（MO）的优良的可见光催化活性。

毕业论文关键词纳米介孔电镜分析光催化

Title Preparation and Properties Of Nano-copper composite oxide

Abstract Spinel copper aluminate (CuAl204) nanoparticles were prepared by the inorganic salt sol-gel method. The nanosized Cu2O/PEG400 composite hollow spheres (HSs, 50 80 nm in diameter) with mesoporous shells of 15 -20 nm were synthesized by a poly(ethylene glycol) (PEG)-assisted wet-chemical method. The crystalline structure and morphology were characterized by powder X-ray diffraction and transmission electron microscope. scope．The results indicate that the CuAl200 powder with panicle sizes of 10-30 nm exhibit a spinel-type structure．The maximum wavelength of absorption is located at 700 nm in the ultraviolet—visible diffuse reflectance spectrum．The band gap was calculated as about 1．77 eV .The photocatalytic degradation was investigated by using methyl orange，acid red B and reactive red K一2G under the irradiation of mercury—vapor lamp(λ>400 nm)．The degradation rates of these three organic compounds reach 90％in 2 h．Com—parison with the photocatalytic process using methyl orange under ultraviolet-light，mercury，一vapor 1amp and solar ray irradiationshows that spinel CuAl204 nanoparticles have excellent visible．1ight catalytic activity．Inthe hollow nanostructures, the polymer content was ca. 18.1 wt %, and the mean size of the componentnanocrystals and the pore diameter were ca. 5 and 3.8 nm, respectively. In the fabrication process of hollowstructures, poly(ethylene glycol 400) (PEG-400) molecules self-assemble to form micelles which act as templates for the formation of the hollow structures. PEG also acts as a reducing agent, solvent, and complexingagent. The formation of mesoporous structures is due to the oriented-aggregation of composite nanoparticles.The nanosized-composite HSs exhibited peculiar photoluminescence (PL) phenomenon with strong peaks at 414 and 436 nm and weak ones at 454, 570, and 637 nm. Furthermore, the HSs showed excellent adsorption ability for methyl orange (MO) because of their composite and mesoporous shell structures.

Keywords Nano , Mesoporous , Electron microscopy , Photocatalytic activity

绪论 3

第一章实验基本试验方法及要求 3

1.1实验基本试验方法纳米铜复合氧化物的制备和性能:http://www.751com.cn/cailiao/lunwen_70950.html