Synthesis and Characterization of Wormhole-Like Mesoporous SnO2 with High Surface Area

High-surface-area wormhole-like mesoporous SnO2 with a tetragonal rutile-type structure was fabricated adopting the hydrothermal strategy using poly(ethylene glycol) (PEG) as the template, tin chloride as the tin source, and urea as the precipitating agent. The effects of PEG with different molecular weights and its concentration, hydrothermal temperature, and calcination temperature on the pore structure and morphology of SnO2 were examined. The physical properties of these materials were characterized by X-ray diffraction, nitrogen adsorption-desorption, transmission electron microscopy, selected-area electron diffraction, infrared spectroscopy, and ultraviolet-visible diffuse reflection spectroscopy. It is shown that the PEG template could be removed by washing, no significant impact of PEG molecular weight was observed on the surface area of the mesoporous SnO2 samples, but the factors such as PEG concentration, hydrothermal temperature, and calcination temperature exerted considerable influence on the pore structure of the SnO2 samples. After the hydrothermal treatment at 120 °C for 29 h with the molar ratio of PEG (with a molecular weight of 6000 g/mol) to Sn of 0.01, a wormhole-like mesoporous SnO2 sample with a high surface area of 161 m2/g and an average pore size of 2.6 nm was generated. The SnO2 samples exhibited good behavior in UV-light absorption. These porous materials are suitable for use as catalysts, supports, and gas sensors. 以聚乙二醇䜕(PEG)䜕为模板剂,䜕氯化锡为锡源,䜕尿素为沉淀剂,䜕采用水热法合成出高比表面积的蠕虫状介孔四方相金红石型䜕SnO2.䜕䜕考察了䜕PEG䜕分子量及其浓度、水热温度和焙烧温度对䜕SnO2䜕孔结构和形貌的影响.䜕䜕采用䜕X䜕射线衍射、N2䜕吸附-脱附、透射电镜、红外光谱和紫外-可见光谱等技术对样品进行了表征.䜕䜕结果表明,䜕模板剂可被水洗除去,䜕PEG䜕分子量对介孔䜕SnO2䜕的比表面积影响不大,䜕而䜕PEG䜕浓度、水热温度和焙烧温度的影响较大.䜕䜕在以分子量为䜕6000䜕的䜕PEG䜕与䜕Sn䜕的摩尔比为䜕0.01䜕的条件下,䜕于䜕䜕°C䜕水热处理䜕29䜕h䜕后可合成出比表面积高达䜕161䜕m2/g䜕和平均孔径为䜕2.6䜕nm䜕的蠕虫状介孔䜕SnO2.䜕䜕所制得样品具有较好的紫外光吸收性能,䜕适宜用作催化剂、载体和气体传感器等.䜕䜕