TiO2 nanoparticles with increased surface hydroxyl groups and their improved photocatalytic activity
TiO2 nanoparticles with improved photocatalytic activity (TiO2NPs-NaCl(R)) were synthesized through a well controlled sol–gel process in the presence of NaCl. Instead of being incorporated into the lattice of TiO2, the added sodium chloride can be completely removed from the resultant TiO2NPs-NaCl(R) by DI water. The results showed that TiO2NPs-NaCl(R) has 2 times more surface hydroxyl groups than that in TiO2NPs prepared without adding NaCl. Consequently TiO2NPs-NaCl(R) exhibits an enhanced photocatalytic activity for degradation of methylene blue (MB) and HCHO under UV irradiation. This research provides a simple and economic approach to improve photocatalytic performance of TiO2 related materials.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TiO2 synthesized by adding NaCl. ► TiO2's surface structure significantly changed and generated more hydroxyl groups. ► Modified TiO2 exhibited an enhanced photocatalytic activity. ► A simple and economical approach to modify TiO2 materials.
Journal: Catalysis Communications - Volume 19, March 2012, Pages 96–99