二氧化钛光催化氧化-离子色谱法测定液晶材料中的氟含量  

Determination of Fluoride Contents in Liquid Crystal Materials by TiO_2 Photocatalytic Oxidation-Ion Chromatography

作　　者：张红漫[1] 陈敬文[1] 

机构地区：[1]南京工业大学理学院,南京210009

出　　处：《分析化学》2010年第11期1639-1642,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20876078);国家863计划(No.2006AA020103)项目资助

摘　　要：建立了TiO2光催化氧化-离子色谱法测定液晶材料中氟含量的方法。利用TiO2光催化氧化技术作为预处理手段对含氟液晶化合物进行有机破坏,使碳氟键断裂,生成的F-用离子色谱法测定。结果表明,TiO2催化剂用量为0.1g/L时,可达到最佳的光催化降解效果,最佳降解时间为50min。F-峰面积与其含量在0.005～1mg/g范围内呈良好的线性关系,检出限为2.1μg/g。测得3种液晶材料的氟含量分别为7.6,18.1及28.4mg/g,不同浓度的加标回收率为86.0%～118.0%,相对标准偏差RSD(n=5)在3.2%～5.7%之间。本方法不仅适用于有机氟体系,同时也为需经有机破坏后进行测定的有机化合物体系提供了新方法。A novel method for the determination of fluorine contents in liquid crystal materials by titanium dioxide（ TiO2） photocatalytic oxidation-ion chromatography had been developed. The TiO2 photocatalytic oxidation had been used as an organdestroied pretreatment process to degrade fluoride liquid crystal materials, which caused the rupture of chemical bond between the carbon and the fluorine,and the concentrations of inorganic fluorine ion formed from photo-degradation were determined by ion chromatography. The results showed that the optimum efficiency of TiO2 photocatalytic oxidation was obtained with the amounts of TiO2 of 0. 1 g/L and degradation time of 50 min. A linear dependence of peak area on F concentration allowed quantification of F -1 over the range of 0. 005 1 mg/g,and the detection limit was 2. 1 μg/g. The fluorine contents of three liquid crystal samples were determined with the results of 7. 6 mg/g,18. 1 mg/g and 28. 4 mg/g,respectively. The recoveries obtained were among 86% 118% ,and the relative standard deviations（ RSD,n = 5） were found to be 3. 2% 5. 7% . It not only applies to the determination of fluorine contents in other organic-fluorine systems,but also provides a new approach for other organic compounds systems containing organdestroied pre-treatment process.

关 键 词：二氧化钛 光催化氧化 预处理 液晶 离子色谱 氟 

分 类 号：O753.2[理学—晶体学]