Structural characteristics and photocatalytic activity of ambient pressure dried SiO2/TiO2 aerogel composites by one-step solvent exchange/surface modification

• DOI: 10.1007/s11595-016-1334-7
• Publication Date: 2016-02-02T09:53:27Z
• Authors: Haixun Xu; Pinghua Zhu; Lijiu Wang; Zuqiang Jiang; Shanyu Zhao
• Keywords: Ambient pressure; Methyl orange; Titanium Dioxide; Surface Modification; Specific surface area

An ambient pressure synthesis of SiO2/TiO2 binary aerogel was prepared through the low-cost precursors of titanium tetrachloride (TiCl4) and sodium silicate (Na2O·nSiO2). After gelation, solvent exchange and surface modification were performed simultaneously and the modified gel was finally dried under ambient pressure. Microstructural analyses by transmission electron microscope (TEM) indicate that fabricated SiO2/TiO2 aerogel composite shows similar sponge-like nanostructure as silica aerogel, and the Brunauer–Emmett–Teller (BET) analysis shows that the specific surface area of the composite reaches 605 m2/g, and the average pore size is 9.7 nm. Such binary aerogel exhibits significant photocatalytic performance in this paper for treating model pollutant of methyl orange (MO), and the decolorizing efficiency of MO is detected as 84.9% after 210 mins exposure to UV light irradiation. Degraded gel suspends in the water so as to separate from solution for reuse, and after 4 times recycling, 70% degradation efficiency can be easily reached when composite catalyzed system is exposed for 210 mins under UV irradiation.