Department of Civil and Structural Engineering, Research Center for Environmental Technology and Management, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China.
J Hazard Mater. 2010 Jul 15;179(1-3):141-50. doi: 10.1016/j.jhazmat.2010.02.071. Epub 2010 Mar 1.
Nanocrystalline Zn(2)SnO(4) microcubes were hydrothermally synthesized and systematically characterized by XRD, SEM, TEM, XPS, N(2) adsorption-desorption, and UV-vis DRS analysis. The resulting Zn(2)SnO(4) microcubes with the edge size ranging from 0.8 to 1.2 microm were composed of numerous nanoparticles with size of 10-20 nm, and their optical band gap energy was estimated to be 3.25 eV from the UV-vis diffuse reflectance spectra. On degradation of nitrogen monoxide (NO) and formaldehyde (HCHO) at typical concentrations for indoor air quality, these nanocrystalline Zn(2)SnO(4) microcubes exhibited superior photocatalytic activity to the hydrothermally synthesized ZnO, SnO(2), and Degussa TiO(2) P25, as well as C doped TiO(2) under UV-vis light irradiation. This enhanced photocatalytic activity of the nanocrystalline Zn(2)SnO(4) microcubes was attributed to their bigger surface areas, smaller particle size, special porous structures, and special electronic configuration. The nanocrystalline Zn(2)SnO(4) microcubes were chemically stable as there was no obvious deactivation during the multiple photocatalytic reactions. This work presents a promising approach for scaling-up industrial production of Zn(2)SnO(4) nanostructures and suggests that the synthesized nanocrystalline Zn(2)SnO(4) microcubes are promising photocatalysts for indoor air purification.
纳米晶 Zn(2)SnO(4) 微立方体通过水热合成法制备，并通过 XRD、SEM、TEM、XPS、N(2)吸附-脱附、UV-vis DRS 分析对其进行了系统的表征。得到的 Zn(2)SnO(4)微立方体的边长为 0.8-1.2 微米，由许多尺寸为 10-20nm 的纳米颗粒组成，其光学带隙能从 UV-vis 漫反射光谱估算为 3.25eV。在典型室内空气质量下，对氮氧化物 (NO) 和甲醛 (HCHO) 的降解实验中，这些纳米晶 Zn(2)SnO(4)微立方体在紫外可见光照射下，表现出比水热合成的 ZnO、SnO(2)、Degussa TiO(2)P25 以及 C 掺杂 TiO(2)更好的光催化活性。纳米晶 Zn(2)SnO(4)微立方体具有更大的比表面积、更小的粒径、特殊的多孔结构和特殊的电子构型，因此其光催化活性增强。纳米晶 Zn(2)SnO(4)微立方体具有化学稳定性，在多次光催化反应中没有明显的失活现象。这项工作为规模化生产 Zn(2)SnO(4)纳米结构提供了一种很有前途的方法，并表明合成的纳米晶 Zn(2)SnO(4)微立方体是室内空气净化的有前途的光催化剂。
