中文摘要：

氧化锌（ZnO）纳米粉体是一种重要的可用来降解有机污染物的光催化剂。然而,纯的ZnO仅仅能够吸收紫外光和部分可见光,不能够充分利用太阳光。采用了一种络合凝胶法来合成掺杂Al的ZnO纳米粉体。所制备出来的纳米颗粒尺寸在20～50 nm之间,它不仅对波长范围在200～400 nm之间的紫外光有很强的吸收,而且对波长范围在400～700nm之间的可见光也有相当强的吸收。在模拟太阳光的照射下,与纯的ZnO纳米粉体相比,Al掺杂的ZnO纳米粉体显示了很高的对甲基橙的脱色率;而且,ZnO纳米粉体的光催化活性随着Al掺杂量的增加而提高。然而,太高的煅烧温度和过多的催化剂投入量反而对ZnO纳米粉体的光催化活性产生不利的影响。这种光催化剂在降解有机物方面,尤其是在太阳光的条件下会有很大的应用前景。

英文摘要：

Zinc oxide（ZnO） nanosized powder is an important photocatalyst to decompose organic pollutants.However,pure ZnO could only absorb ultraviolet light and partial visible light.In this study,a novel complex-gel method for synthesis of Al-doped ZnO（Al-ZnO） nanosized powders is reported.The prepared Al-ZnO nanopowders have sizes of 20~50 nm,which have strong absorption for ultraviolet light in the wavelength of 200~400 nm,and exhibit relatively strong absorption for the visible light in the wavelength range of 400~700 nm.Compared with pure ZnO nanopowders,Al-ZnO nanopowders exhibit significantly high decolorization rate for methyl orange under the simulated solar irradiation.Furthermore,the photocatalytic property of the Al-ZnO nanopowder is improved with the increase of the doping amount of Al.Whereas too high calcination temperature and catalyst load amount are not favourable for the photocatalytic activity of the Al-ZnO nanopowder.This kind of photocatalyst may find potential applications for degradation of organic pollutants,especially under the condition of sunlight.