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.

采用傅里叶变换红外光谱（FTIR）表征微波加热后碳微球表面的官能团。与葡萄糖原料相比，约1700 cm⁻¹与1640 cm⁻¹处出现的新吸收峰分别归属于羧基与芳香族C=C伸缩振动，佐证了微波辅助加热过程中葡萄糖发生芳构化的结论。约1700 cm⁻¹处的羧基（-C=O）吸收峰与约3400 cm⁻¹处的-OH伸缩振动峰的存在，表明在盐酸与微波辐照作用下，生成了富含羟基官能团的反应产物（如-COOH）。碳微球在1000~1300 cm⁻¹波段的吸收峰强度出现下降，该波段吸收峰归属于C-OH伸缩振动与-OH弯曲振动，这也印证了缩合反应与聚合反应的发生。
煅烧后的TiO₂-C复合材料的X射线衍射（XRD）谱中所有衍射峰均可标定为TiO₂的锐钛矿相。