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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。
The pure ZnO thin films and aluminum-doped ZnO thin films were prepared from Zn (NO3) 2 and Zn (NO3) 2 + Al (NO3) 3 aqueous solutions using stainless steel as substrate. The effects of Al doping on the phase transformation and photocatalytic activity of ZnO thin films were investigated by X-ray diffraction, scanning electron microscopy and UV-Vis diffuse reflectance spectroscopy. The results show that part of Al3 + enters into the lattice of ZnO and forms a solid solution in the Al-doped ZnO thin films. Al doping results in a blue shift of about 50 nm in the absorption threshold of ZnO. Compared with the pure ZnO thin films, the aluminum-doped ZnO films showed higher catalytic activity in the UV and visible regions, and the degradation rate of methyl orange increased by 45% and 30% respectively after 60 min reaction. The reasons for the increase of photocatalytic activity of aluminum-doped ZnO thin films were discussed.