其降解水中CHCl3的催化性能
(1. 衡阳师范学院 化学与材料科学系, 衡阳 421008;
2. 中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 制备一系列Fe3+, Ce3+共掺杂的纳米TiO2，并用X射线衍射仪进行表征。与单一金属离子掺杂相比，当x(Fe3+)=0.020和x(Ce3+)≈0.010时， Fe3+， Ce3+共掺杂不仅显著抑制纳米晶TiO2的相转化，而且大大提高了其热稳定性。 在紫外灯辐照下， 用Fe3+， Ce3+共掺杂的纳米晶TiO2可降解水中的三氯甲烷，表现出强的催化活性。 随着掺杂Fe3+的摩尔分数增大，x(Fe3+)=0.020时， CHCl3的降解率存在一个最佳值， 而随着掺杂Ce3+的摩尔分数增大， CHCl3的降解率先是急剧上升， 而x(Ce3+)>0.020时， 其增势趋缓。
关键字: 纳米二氧化钛； 稀土； 三氯甲烷； 过渡金属离子；共掺杂； 光催化
CHCl3 in water
（1. Department of Chemistry and Materials Science,
Hengyang Normal University, Hengyang 421008, China;
2. School of Minerals Processing and Bioengineering,
Central South University, Changsha 410083, China）
Abstract: A series of Fe3+, Ce3+ co-doped nano-TiO2 were prepared and characterized by XRD. Compared with one of Fe3+ or Ce3+ ions doping, co-dopants not only inhibit the phase transition of nanocrystalline TiO2 significantly, but also improve its thermal stability remarkably at x(Fe3+)=0. 020 and x(Ce3+)≈0. 010. Strong photocatalytic activity shows for the degradation of trichloromethane in water by the nano-TiO2 under irradiation of UV light. There is an optimum degradation of trichloromethane at x(Fe3+)=0.020. But the degradation of trichloromethane firstly increases rapidly, then it rises slowly when the mole fraction of Ce3+ is over 0.020.
Key words: nanosized titania; rare earth; trichloromethane; transition metal ions; co-doping; photocatalysis
