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高光活性双相纳晶二氧化钛光催化剂通过溶剂蒸发诱导结晶方法制备,然后在不同温度下对其进行热处理。用X射线衍射(XRD)、透射电子显微镜(TEM)和BET比表面分析对二氧化钛光催化剂的结构进行了表征。通过空气中丙酮的光催化降解对二氧化钛的光催化活性进行了表征。结果显示:溶剂蒸发能够促进二氧化钛在100℃晶化和相变。当煅烧温度小于600℃,二氧化钛粉末的孔径大小分布为双峰分布,在700℃,由于团聚体颗粒内的孔的坍塌,其孔径大小分布为单峰分布,它对应于团聚体颗粒间的孔。所获得的二氧化钛光催化剂在100℃显示出高的光催化活性,在400℃,其光催化活性超过Degussa P25的光催化活性。这可能是由于该方法所制备的二氧化钛光催化剂具有高的比表面积、小的晶粒尺寸和双峰孔径大小分布引起的。
Highly photoactive dual-phase nanocrystalline titanium dioxide photocatalysts are prepared by solvent evaporation-induced crystallization followed by heat treatment at different temperatures. The structure of titania photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET specific surface analysis. The photocatalytic activity of titanium dioxide was characterized by photocatalytic degradation of acetone in the air. The results show that solvent evaporation can promote the crystallization and phase transition of TiO2 at 100 ℃. When the calcination temperature is less than 600 ° C, the titania powder has a bimodal distribution in pore size distribution and its pore size distribution is a unimodal distribution due to the collapse of pores in the agglomerate particles at 700 ° C, which corresponds to pores between agglomerate particles . The titanium dioxide photocatalyst obtained showed a high photocatalytic activity at 100 ° C and a photocatalytic activity at 400 ° C exceeding the photocatalytic activity of Degussa P25. This may be due to the titanium dioxide photocatalyst prepared by this method has a high specific surface area, small grain size and bimodal pore size distribution caused.