Preparation hollow TiO2 microspheres by microwave-assisted method in open system and the research of photocatalytic property of TiO2 microspheres

FTIR spectrum was used to identify the functional groups on the carbon microspheres after heating under microwave.  New bands in comparison with glucose at ~1700 and ~1640 cm-1 were attributed to carboxyl groups and aromatic C=C vibrations respectively, supporting the concept of aromatization of glucose during microwave-assisted heating. The presence of bands of carboxyl (-C=O) groups at ~1700 cm-1 and -OH stretching vibration at ~3400 cm-1 indicated that the reactive products with a higher abundance of hydroxyl functional groups, such as -COOH, were formed under the presence of hydrochloride acid and microwave irradiation. The decrease of bands at 1000-1300 cm-1 in carbon microspheres, which assigned to the C-OH stretching and -OH bending, also implied the condensation reactions and polymerization.

All peaks in XRD of the calcined TiO2-C could be indexed as anatase phase of TiO2.