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络合凝胶法合成Al掺杂纳米ZnO及其光催化性能

Keywords: 络合-凝胶法,铝掺杂,氧化锌,光催化,可见光

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Abstract:

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20~50nm之间,它不仅对波长范围在200~400nm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。

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