Pt／MWCNT／GC修饰电极对萘酚体系的测定应用

Pt/MWCNT/GC Modified Electrode and Its Application to Determination of Naphthol Isomers

用氢气还原法制备了线度为10rim的铂纳米粒子．利用Nation的协同作用，将纳米铂和碳纳米管同时修饰到玻碳电极表面，形成纳米管、纳米铂网状结构．此复合修饰电极在HAc—NaAc体系中对萘酚的氧化表现出良好的电催化性能，不仅测量灵敏度高，而且克服了单一碳纳米管修饰电极在萘酚测定中重现性差的问题，结合微分技术，实现了萘酚异构体的同时测定．在浓度为1．0×10^-6～8×10^-4mol·L^-1范围内，1-萘酚和2-萘酚的半微分氧化峰电流值均与其浓度呈线性关系，检测限分别为5．0×10^-7和6．0×10^-7mol．L^-1．

Pt nanoparticles were synthesized by using hydrogen as reduction reagent, and the complex modified electrode was fabricated by incorporating muhi wall carbon nanotubes, Pt nanoparticles and Nafion onto the glassy carbon electrode surface and is denoted as Pt/MWCNT/GC electrode. The Pt/ MWCNT/GC electrode is of good electro-catalytic response towards naphthols and better repro- ducibility than that of the MWCNT/GC electrode in the detection because of the formation of Pt- MWCNT network. With the semi-derivative technique, naphthol isomers are determined simultaneously and quantitatively with the Pt/MWCNT/GC electrode. In pH 5.8, 0.1 mol· L^-1 HAc- NaAc buffer solution, the linear calibration ranges from 1.0 × 10^-6 to 8.0 × 10^-4 mol· L^- 1 for both 1-and 2- naphthol, with detection limits of 5.0 × 10^-7 for 1-naphthol and 6.0 × 10^-7 mol· L^- 1 for 2-naphthol respectively.