纳米SnO2可见光下光催化氧化NO

Photocatalytic oxidation of NO over nano tin dioxide under visible light

以SnI4为前驱体,采用SnI4低温水解的方法成功制备了粒径约3 nm的纳米SnO2,并采用XRD、TEM、HRTEM、UV-Vis对其进行了表征。结果表明,相比商用SnO2,制备出的SnO2纳米颗粒由于其结晶度降低,粒径更小,使得纳米SnO2禁带宽度更窄,对光的吸收范围成功拓宽至了可见光区。该方法路线简单高效,不需要经过高温处理。合成的SnO2经过动态测试法进行测试,在可见光的照射下,对流速为2.4 L/min、浓度为550μg/dm^3的NO降解率可达39.88%。

The tin dioxide nanoparticles about 3 nm were prepared via low-temperature hydrolysis with tin tetraiodide as the precursor.Then the materials were characterized by XRD,TEM,HRTEM and UV-Vis DRS.The results show that compared with commercial tin dioxide,the prepared tin dioxide nanoparticles have a lower crystallinity,smaller particle size and a narrower band gap.The absorption range is broadened to the visible region.This synthesis method is simple and efficient withthout subsequent high temperature processing.And using tin dioxide as a photocatalyst to degrade formaldehydeunder under the irradiation of visible light,flow rate of 2.4 L/min,the degradation rate of NO with a concentration of 550μg/dm^3 can reach 39.88%in dynamic testing condition.