球型多孔二氧化硅吸附剂的制备和性能

Preparation and Adsorption Performance of Porous Spherical Silica

在异丙醇水溶液中进行正硅酸乙酯水解-缩聚反应得到二氧化硅纳米球,然后在聚乙烯吡咯烷酮保护下将其用氢氧化钠溶液刻蚀,得到球型多孔二氧化硅吸附剂。用透射电镜、BET氮吸附法分别测试合成吸附剂的形貌和比表面积,并考察其吸附性能及其影响因素。结果表明,合成的二氧化硅具有近单分散的多孔纳米球型形貌,比表面积超过600 m^2/g,能有效吸附水中的重金属离子。

The silica nanospheres were prepared by hydrolysis-condensation reaction of TEOS in isopropanol aqueous solution. Then the silica nanospheres were etched by sodium hydroxide under the protection of polyvinylpyrrolidone. The morphology and specific surface area of the synthetic silica nanospheres were tested by TEM and BET Nitrogen adsorption method, respectively. The model wastewater containing lead ion was used to investigate the adsorption properties and influencing factors of the prepared samples. The results show that the prepared silica have monodipersed porous spherical morphology with the specific surface area of larger than 600 m^2/g, which can remove heavy metals in the wastewater efficiently.