苯二酚在PTh／NTiO2／GCE上的电化学行为的研究

摘要

该文利用循环伏安法（CV）和线性扫描溶出伏安法（LSSV）研究了对苯二酚（HQ）和间苯二酚（RS）在聚噻吩／纳米二氧化钛修饰玻碳电极（PTh／NTiO。／GCE）上的电化学行为。该修饰电极作为两种苯二酚传感器表现出极好的灵敏度和选择性。在0．2mol／L柠檬酸一磷酸氢二钠缓冲溶液（pH4．6），RS和HQ的氧化峰电位相距508mV，且在PTh／NTiO2／GCE上的峰比在裸GCE上的高出6．5倍。在最佳条件下，PTh／NTiO2／GCE对HQ和RS在1．0×10^-7～8．0×10^-6范围内都有较好的线性关系，混合物中的检出限（S／N一3）分别为3．3×10mol／L和3．7×10^-8mol／L。通过计算得出了一些动力学参数如电子转移数（n），质子转移数（m）。该法被用来同时测定废水中的RS和HQ结果满意。%In this paper, the electrochemical behavior of hydroquinone（HQ） and resorcinol（RS） on the polythiophene / Nano Ti- tanium dioxide modified glassy carbon electrode （PTh/NTiO2/GCE） were investigated by cyclic voltammetry and linear sweep stripping vohammetry（LSSV）. The modified electrode showed excellent sensitivity and selectivity properties for the two di- hydroxybenzene isomers. 0.2 mol/L citric acid-disodium hydrogen phosphate buffer solution（pH 4.6）, the oxidation peak po- tential difference between HQ and RS was 508 mV, and the peaks on the PTh/NTiO2/GCE were 6.5 times as high asthe ones on bare glass carbon electrode. Under optimized conditions, the PTh/NTiOz/GCE showed a good linear relationship in the range of 1.0 ×10^-7 ~8.0 ×10^-- 6 mol/L for HQ or for RS, with the detection limits 3.3 ×10^-8 mol/L for HQ and 3.7 ×10^-8 mol/L for RS （S/N =3） in mixture, respectively. Some kinetic parameters, such as the electron transfer number （n）, and proton transfer number （m）, were calculated. The proposed method was applied to simultaneous determine HQ and RS in real waste water samples with satisfactory results.