纳米二氧化钛对痕量铅的吸附性能研究  

Study on adsorption behavior of trace Pb on nanometer-size titanium dioxide

作　　者：刘正华[1] 周方钦[1] 黄荣辉[1] 杨柳[1] 罗友云[1] 晏衡湘 

机构地区：[1]湘潭大学化学学院,湘潭411105 [2]株洲自来水公司,株洲412000

出　　处：《分析试验室》2006年第11期63-66,共4页Chinese Journal of Analysis Laboratory

基　　金：湖南省教育厅自然科学基金(02C576)项目资助

摘　　要：提出了纳米TiO2分离富集, 火焰原子吸收光谱法测定水样中痕量铅的新方法.考察了铅在纳米TiO2上的吸附动力学、最佳酸度和吸附容量.实验结果表明：在最佳实验条件下,纳米TiO2能定量、快速地吸附水中的痕量Pb^2＋,其静态吸附容量为17.90 mg/g.吸附在纳米TiO2上的Pb^2＋可用0.1 mol/L HNO3＋0.1 mol/L CH3COOH完全洗脱.对Pb2＋的检出限为2.57 ng/mL, 相对标准偏差为2.5% （n=11, ρ=0.10 μg/mL）,加标回收率在94.5%～102.5%之间.可用于实际水样中铅的测定.A new method for the determination of trace Pb based on nanometer-size TiO2 separation and preconcentration with FAAS was proposed. The optimum conditions for adsorption were studied in detail, and the test included adsorption kinetics, effect of pH on adsorption ratio, and adsorption capacity. Under the optimum conditions, Pb^2＋ could be adsorbed and eluted quantitatively. The static adsorption capacity of Pb^2＋ on nanometer-size TiO2 was 17.90 mg/g, and 0.1 mol/L HNO3 ＋ 0.1 mol/L CH3 COOH was sufficient for complete elution. The detection limit of this method for Pb^2-. was 2.57 ng/mL, and relative standard deviation was 2.5 % （ n = 11, c = 0.10μg/mL）. The recoveries of Pb^2＋ ranged from 94.5% to 102.5%. The proposed method has been applied for the determination of trace Pb in water samples with satisfactory results.

关 键 词：纳米TIO2 吸附 分离富集 铅 火焰原子吸收光谱法 

分 类 号：O652.6[理学—分析化学]