其降解水中CHCl3的催化性能
(1. 衡陽(yáng)師范學(xué)院 化學(xué)與材料科學(xué)系, 衡陽(yáng) 421008;
2. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 制備一系列Fe3+, Ce3+共摻雜的納米TiO2，并用X射線衍射儀進(jìn)行表征。與單一金屬離子摻雜相比，當(dāng)x(Fe3+)=0.020和x(Ce3+)≈0.010時(shí)， Fe3+， Ce3+共摻雜不僅顯著抑制納米晶TiO2的相轉(zhuǎn)化，而且大大提高了其熱穩(wěn)定性。 在紫外燈輻照下， 用Fe3+， Ce3+共摻雜的納米晶TiO2可降解水中的三氯甲烷，表現(xiàn)出強(qiáng)的催化活性。 隨著摻雜Fe3+的摩爾分?jǐn)?shù)增大，x(Fe3+)=0.020時(shí)， CHCl3的降解率存在一個(gè)最佳值， 而隨著摻雜Ce3+的摩爾分?jǐn)?shù)增大， CHCl3的降解率先是急劇上升， 而x(Ce3+)>0.020時(shí)， 其增勢(shì)趨緩。
關(guān)鍵字: 納米二氧化鈦； 稀土； 三氯甲烷； 過(guò)渡金屬離子；共摻雜； 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
