以TiCl4和钛酸丁酯为前驱体,通过水热法制备了三维海胆状TiO2分级结构,并在制备的TiO2上构筑钙钛矿型甲胺碘化铅(CH3NH4PbI3)薄膜形成三维海胆状CH3NH4PbI3/TiO2异质结构材料。利用X射线衍射仪、扫描电子显微镜、紫外-可见吸收光谱对不同温度下制备的材料结构、形貌及光吸收性能进行了表征。以甲醛为目标降解物,研究了可见光照射下CH3NH4PbI3/TiO2的催化性能,并用傅里叶变换红外光谱仪分析了甲醛的降解产物。结果表明:热处理温度为120℃时,成功合成了三维海胆状CH3NH4PbI3/TiO2异质结构材料。在可见光照射下,由于CH3NH4PbI3/TiO2异质结构材料较强的可见光吸收率及CH3NH4PbI3和TiO2之间的协同作用,材料表现出比纯三维海胆状TiO2更好的光催化降解甲醛性能。可见光照射下降解120min后,CH3NH4PbI3/TiO2对甲醛的降解率高达92％,是纯三维海胆状TiO2降解率的3倍左右。基于实验结果,初步分析了CH3NH4PbI3/TiO2异质结构材料光催化降解甲醛的机理,推断了该材料增强甲醛的光催化降解活性机制。
3D urchin-like TiO2 heterostructure was prepared by hydrothermal method and using TiCl4 and butyl titanate as precursors.The perovskite-type CH3NH4PbI3 heterostructure film was formed on the prepared TiO2 to form 3D urchin-like CH3NH4PbI3/TiO2 heterostructure material.The structure,morphology and light absorption properties of the materials prepared at different temperatures were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and UV-Vis absorption spectroscopy.The catalytic properties of CH3NH4PbI3/TiO2 under visible light were studied with formaldehyde as the target degradant.The degradation products of formaldehyde were analyzed by infrared spectroscopy.The results showed that the CH3NH4PbI3/TiO2 was synthesized at a heat treatment temperature of 120℃.Under irradiation,due to the strong visible light absorption of the CH3NH4PbI3/TiO2 and the synergistic effect between CH3NH4PbI3 and TiO2,the materials showed better photocatalytic degradation of formaldehyde than pure 3D TiO2.After 120min,the degradation rate of formaldehyde in CH3NH4PbI3/TiO2 was as high as 92%,which was about three times that of pure urchin-like TiO2.Based on the results,the mechanism of photocatalytic degradation of formaldehyde by CH3NH4PbI3/TiO2 was analyzed.The mechanism for enhancing the photocatalytic degradation activity of formaldehyde was inferred.
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