纳米SnO_2的水热法合成及光催化性能研究

Hydrothermal Synthesis and Photocatalytic Properties of SnO_2 Nanoparticles

以SnCl2·2H2O为原料、酒石酸为络合剂,采用水热法制备了SnO2纳米颗粒,通过X射线衍射（XRD）、扫描电镜（SEM）,紫外-可见（UV-Vis）光谱及荧光光谱（PL）等对样品的物相结构、微观形貌、光吸收性能等进行分析表征,以酸性红B模拟染料废水,考察了其光催化性能。结果表明：不同水热温度下所合成的样品均为四方晶系SnO2,空间群为P42/mnm,晶胞参数a=b=0.4738 nm,c=0.3187 nm;160℃下所得样品具有优异的光催化性能,颗粒基本呈球形,尺寸约为13~23 nm。当催化剂用量为20 mg/50 m L,紫外光为光源,反应时间为50 min时,酸性红B的降解率可达97.1%,且降解反应属于一级反应动力学机理。

SnO2 nanoparticles were synthesized by hydrothermal method using SnC12 · 2H2O as raw materials and tartaric acid as complexing agents. The phase structure, morphology and optical absorption properties of the as-synthesized SnO2 were characterized by X-ray powder diffraction （ XRD）, scanning electron microscopy （SEM）, UV-Vis spectra and photoluminescence （PL） spectra. To investigate the photocatalytic activity of the product, acid red B was used as simulated dye wastewater. The results indicate that the samples synthesized under different hydrothermal temperature are all tetragonal phase SnO2 with space group P42/mnm and cell parameters a = b =0. 4738 nm,c =0. 3187 nm. SnO2 obtained at 160 ℃ shows excellent photocatalytic activity,the particles are nearly spherical in shape, and the size is about 13-23 nm. When the dosage of nano-SnO2 is 20 mg/50 mL, UV light is used as irradiation source and reaction time is 50 min, the degradation rate can reach to 97. 1%. The degradation of dye acid red B can be considered as the first-order reaction kinetics.