超大比表面积硫铟锌的低温水浴合成及光催化性能研究

Synthesis of ZnIn_2S_4 with Super Specific Surface via Low-temperature Water Bath Method and Its Photocatalytic Activity

在低温条件下通过水浴法合成了具有超大比表面积的硫铟锌纳米微球。用X射线衍射(XRD)、扫描电子显微镜(SEM)、N2吸附-脱附(BET)法及紫外-可见光漫反射(DRS)等手段对试样的晶体结构、显微结构及吸光特性进行了表征,同时通过甲基橙降解实验研究了其光催化性能。结果发现,硫铟锌微球的粒径随水浴温度升高而增大,比表面积随水浴温度升高而减小。经低温40℃合成的硫铟锌微球平均粒径为200 nm左右,比表面积为756. 78 m^2/g。甲基橙降解实验结果表明,40℃水浴法合成的硫铟锌样品光催化活性最高,其可能与水浴法制备的硫铟锌较小的颗粒尺寸和超大的比表面积有关。

ZnIn2S4 microspheres with super specific surface were successfully synthesized by water-bath route at 40 ℃,60 ℃ and 80 ℃,respectively. The crystal structure,microstructure and absorption characteristics of as-synthesized ZnIn2S4 were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),Brunauer-Emmett-TeIler( BET) analysis as well as ultraviolet-visible diffuse reflectance spectra( DRS). The results showed that the particle size of as-synthesized samples increased with the increase of water-bath temperature,but the specific surface area decreased with the increase of water-bath temperature. For sample synthesized at 40 ℃,the average particle size were about 200 nm and the specific surface areas was756. 78 m^2 g^-1. The photocatalytic activities of samples were evaluated by photocatalytic degradation of methyl orange under visible-light irradiation. The result indicated that the as-synthesized samples by water bath at40 ℃ possessed the highest visible-light photocatalytic activity. The smaller particle size and larger specific surface area of samples prepared by water bath were proposed to be responsible for the enhanced photocatalytic performance.