纳米二氧化钛材料对稀土络合物吸附性能的研究

Study on Adsorption Behavior of Rare Earth Complexes on Nanometer-Size Titanium Dioxide with ICP-AES

提出了以纳米二氧化钛作为吸附剂 ,用于稀土元素形态分析的新方法。以ICP AES为检测手段 ,详细考察了纳米二氧化钛材料在静态条件下对铕及其各种络合物的吸附性能。结果表明 ,Eu的柠檬酸络合物在pH 4.0以上、Eu的 8 羟基喹啉和α 羟基异丁酸络合物在pH 4.5以上可以被纳米二氧化钛定量吸附 ,游离态的Eu3+ 在pH 6.0以上才能被吸附 ,而Eu的EDTA络合物在所研究的pH范围内均不被纳米二氧化钛吸附 ,纳米二氧化钛材料对溶液中稀土元素的不同的结合态的吸附性能存在较大差异 。

A new method of using nanometer TiO 2 as solid phase extractant coupled with ICP AES was proposed for specialization of rare earth elements. The adsorption behavior of rare earth complexes on nanometer TiO 2 was investigated. Effect of pH, contact time, elution solution and interfering ions on the recovery of the rare earth complexes were studied. A quantitative recovery (>90%) is found in the pH range of 4～9 for Eu citric, 4.5～9 for Eu oxine and Eu HIBA, and 6.5～9 for Eu 3+ . Eu EDTA can not be adsorbed in the studied pH range. There is large different in the adsorption behavior on nanometer TiO 2 between rare earth elements and its complexes. The possibility of application of nanometer TiO 2 on the specialization of rare earth elements was explored.