阴极电沉积制备铝掺杂ZnO薄膜及其光催化性能  

CATHODIC ELECTRODEPOSITION OF Al-DOPED ZnO FILM AND ITS PHOTOCATALYTIC PERFORMANCE

作　　者：魏守强[1] 卢旭东[1] 邵忠财[1] 刘瑛[1] 田野[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110168

出　　处：《硅酸盐学报》2009年第5期793-797,共5页Journal of The Chinese Ceramic Society

摘　　要：以不锈钢为基体,采用阴极电沉积法,从Zn(NO3)2和Zn(NO3)2+Al(NO3)3水溶液中制备了纯ZnO薄膜和铝掺杂ZnO薄膜。用X射线衍射、扫描电镜和紫外-可见光漫反射光谱研究了铝掺杂对ZnO薄膜相变和光催化活性的影响。结果表明:在铝掺杂ZnO薄膜中,部分Al3+进入ZnO的晶格,形成固溶体;铝掺杂使ZnO的吸收阈值蓝移大约50nm。和纯ZnO薄膜相比,铝掺杂ZnO薄膜在紫外光和可见光区均呈现出更高的催化活性,反应60min后,甲基橙的降解率分别提高了45%和30%。探讨了铝掺杂ZnO薄膜光催化活性提高的原因。Pure ZnO and Al-doped ZnO films were prepared on stainless steel substrate by the cathodic electrodeposition method from Zn（NO3）2 and Zn（NO3）2 ＋ Al（NO3）3 aqueous solution, respectively. The phase structure and morphology of the Al-doped ZnO films and their photocatalytic capacity were investigated by X-ray diffraction, scanning electron microscopy and ultraviolet-visible （UV-Vis） diffuse reflection spectra. The results indicate that part of Al^3＋ can enter the ZnO lattice and a solid solution is formed in Al-doped ZnO film. The absorption threshold of the Al-doped ZnO film is blue shifted about 50 nm. The Al-doped ZnO film has higher photocatalytic activity compared with pure ZnO film under irradiation of both UV and Vis lights. The rates of degradation to methyl orange for the Al-doped ZnO film increase by 45% and 30% after irradiation by UV and Vis lights for 60 min, respectively. The reason for the enhancement of photocatalytic activity of the Al-doped ZnO film is also discussed.

关 键 词：掺铝氧化锌薄膜 电沉积 光催化活性 甲基橙 

分 类 号：O643[理学—物理化学]