氧缺陷型SnO2纳米颗粒可见光催化性能的研究

由简单的水热法合成了一种可高效降解有机染料的氧缺陷型Sn O2纳米颗粒新型光催化剂,用X射线衍射、透射电镜、高分辨透射电镜和紫外-可见分光光度计等手段对其结构及性能进行了表征。结果表明,所制备的催化剂的禁带宽度最小可达2.90e V,可实现对可见光的有效吸收利用,对甲基橙的降解反应具有很高的光催化活性。将该催化剂(1g/L)分散在10mg/L的甲基橙溶液中,可见光照射下,40min内甲基橙的降解率达99%以上。由于该催化剂具有合成方法简单、高效、成本低和反应条件温和等特点,为有效解决有机染料对环境的污染问题提供了一条新的途径。

Study on visible-light photocatalytic properties of oxygen defect SnO2 nanoparticles

In this paper, we reported a novel photocatalyst consisting of oxygen-deficient SnO2 nanoparticles which can effectively degrade methyl orange (MO) under visible light. The catalyst was prepared by a simple hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflectance spectra were employed to characterize the structure and catalytic performance of the catalyst. The results suggest that the band gap of as-prepared catalyst can be lowered to 2.90 eV, and thus the visible light absorption of the catalyst can be enhanced. The photocatalytic activity of the as-prepared catalyst was evaluated by degradation of methyl orange (MO) under irradiation of visible light. It turns out that the degradation rate of MO (10 mg/L) by oxygen-deficient SnO2 nanoparticles (1 g/L) can reach above 99% in 40 minutes under visible light illumination. Because the reported catalyst here has the advantages of simple synthesis, high catalytic performance, low costs and mild reaction environment, it provides a new approach to solve the problem of organic dyes pollution in environment.