Abstract:
TiO
2-C hybrid aerogels were obtained by a one-pot sol-gel method, followed by supercritical drying and pyrolysis, using resorcinol (R) and furfural(F) as carbon sources, and TiCl
4or Ti(OBu)
4 as the TiO
2 precursor. The hybrid aerogels were characterized by XRD, HR-TEM and N
2 adsorption. The photocatalytic activity of the samples was evaluated based on the conversion of methylene blue (MB) under UV light. Results showed that the type of precursor and the mass ratio of TiO
2 to carbon influenced the surface area and MB conversion. The TiO
2-C hybrid aerogels using TiCl
4 as TiO
2 precursor had a higher surface area and a better photocatalytic activity than those using Ti(OBu)
4 as precursor under otherwise identical conditions. The best sample was obtained when TiCl
4 was used and the TiO
2 content was 40%. This had the largest average pore size of 7.8 nm, the highest mesopore volume of 0.40 cm
3/g and the highest MB conversion of 99.6% under an ultraviolet exposure for 180 min.