摘要
采用简便的水热法,获得了具有氧化酶催化特性的二氧化锰纳米管,研究了其对氧气(O2)氧化3,3,5,5-四甲基联苯二胺(TMB)发生显色反应的催化性能,重点考察了常见金属离子对其活性的抑制作用。结果表明,能与MnO2表面发生特异性吸附络合作用的Pb2+的抑制作用最为显著。基于该抑制作用,建立了针对铅离子的高灵敏、快速检测新方法。结果显示,铅的线性范围为1.0×10-7~1.0×10-3mol/L,检出限为3.0×10-8mol/L。
Manganese dioxide nanotubes possessing oxidase-like catalytic properties was synthesized by simple hydrothermal method.Influences of solution pH,temperature and catalyst dose on the catalytic performance of the nanotubes on the oxidation of 3,3 ＇,5,5 ＇-tetramethylbenzidine （TMB） were evaluated by measuring the UV-visible absorbance of the oxidation product of TMB.The optimum reaction conditions were as follows：concentration of manganese dioxide was 0.015 mg/mL,the reaction was conducted in pH 4.0 acetic acid-sodium acetate buffer solution at room temperature for 10 min.The influences of common metal ions on the enzyme-like catalytic performance of the manganese dioxide nanotubes were also investigated.The results indicated that lead （Ⅱ）ions revealed the most remarkable inhibition effect on the catalytic activity of manganese dioxide nanotubes.Based on this inhibition effect,a novel,highly sensitive and rapid colorimetric method for lead ions was developed.The calibration curve was linear over lead concentration in the range of 1.0 × 10-7-1.0 × 10-3 mol/L,and the detection limit was 3.0 × 10-8 mol/L.
出处
《分析测试学报》
CAS
CSCD
北大核心
2014年第2期173-178,共6页
Journal of Instrumental Analysis
基金
国家自然科学基金项目(20903048
21005031
21275065)
江苏省检验检疫局科技计划项目(2011KJ17)
关键词
二氧化锰纳米管
水热法
模拟氧化酶
催化氧化
抑制作用
manganese dioxide nanotubes
hydrothermal method
enzyme mimetics
catalytic oxidation
inhibition
