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锐钛矿型 Ti O2 多孔纳米薄膜可以从含聚乙二醇的钛醇盐溶胶前驱体中通过浸渍提拉法制备 ;涂层的形貌如孔的大小和孔的分布可以通过聚乙二醇的加入量来控制 ,当聚乙二醇的加入量为 0— 2 .0 g时 ,孔径大小在 0— 40 0 nm范围内变化。可见光透过光谱分析表明 :随着 Ti O2 薄膜中孔径增大 ,光的散射增强 ,透光率减小 ,该 Ti O2 镀膜玻璃对于紫外线具有吸收作用。有机磷农药水溶液的太阳光催化降解实验表明 :在 Ti O2 薄膜中引入气孔增强了光催化活性 ,孔的大小和薄膜厚度对光解率有显著的影响。当孔径大小为 1 0 0— 2 0 0 nm,镀膜次数为 1 0— 1 5次时 ,Ti O2 薄膜显示光催化效率高。
Anatase Ti O2 porous nano-film can be prepared from dipropylene glycol-containing titanium alkoxide sol precursor by dip-pull method; the morphology of the coating such as pore size and pore distribution can be determined by polyethylene glycol Of the amount of added to control, when the amount of polyethylene glycol added 0-2.0 g, the pore size in the range of 0- 40 0 nm. Visible light transmission spectrum analysis showed that: with the increase of the pore diameter of Ti O2 film, the light scattering increases and the light transmittance decreases. The Ti O2 coated glass has an absorption effect on ultraviolet light. The experiments of solar photocatalytic degradation of organophosphorus pesticide aqueous solution show that the introduction of pores in the Ti O2 film enhances the photocatalytic activity, and the pore size and film thickness have a significant effect on the photodegradation rate. When the pore size is 1 0 0-2 000 nm and the number of coating times is 10-1 5, the Ti O2 film shows high photocatalytic efficiency.