掺铁TiO_2纳米微粒的制备及光催化性能

Preparation and Photocatalytic Property of Iron-doped TiO_2 Nanoparticles

采用溶胶 凝胶法制备了粒径为 60～ 70nm的掺铁TiO2 纳米微粒。用TG DTA、XRD、LDPSA、SEM等手段对其进行了表征。用UV Vis分光光度计研究了掺铁TiO2 纳米微粒的光吸收特性与光催化活性。结果表明 ,掺杂铁离子使TiO2 纳米粒径的粒径变小 ,光谱响应范围扩大。通过对苯酚的光催化降解研究 ,发现掺入质量分数为 0 0 5 %Fe的TiO2 与纯TiO2 相比其平均降解速率提高了 1 3

The iron-doped TiO_2 nanoparticles in size of 60～70 nm were prepared by a sol-gel method, followed by freeze-drying treatment for 2 h. TG-DTA, XRD, UV-Vis, LDRSA and SEM observation and techniques were used to characterize the ultrafine particles. The presence of iron ion in TiO_2 crystalline was found to increase the photocatalytic activity of TiO_2 in degradation of phenol. The iron-doped TiO_2 with diffe- rent mass percentage of Fe 3+ were compared with pure TiO_2 when being used as photocatalyst in degradation of phenol. The best catalytic activity was observed in TiO_2 with 0.05% doped Fe 3+ .