L-半胱胺尾式卟啉铜(II)修饰金电极检测苯酚  

Preparation of L-cysteamine tailed porhyrin Cu(II) self-assembly Au electrode and the detection of phenol

作　　者：李天华[1] 干宁[1] 王志颖[1] 陈妮[1] 陈锋[1] 

机构地区：[1]新型功能材料及其制备科学国家重点实验室宁波大学材料与化学工程学院,浙江宁波315211

出　　处：《化学研究与应用》2007年第6期598-602,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(60508012);浙江省科技攻关项目(2006C31040)

摘　　要：将制备的L-半胱胺卟啉铜(II)(CuL)配合物自组装在Au电极表面,获得电化学苯酚传感器(CuL/Au)。在pH 7.0的磷酸盐缓冲液(PBS)中于-0.4 V^0.5 V(vs.SCE)电位范围内有一对氧化还原峰,峰电位分别为Epa=0.09 V和Epc=-0.06 V。实验结果表明CuL能够催化氧化苯酚,通过产物在电位0.1 V下的电化学响应对苯酚进行测定。该电极对苯酚表现出快速的响应(响应时间<10 s)。传感器对苯酚的测定具有较宽的线性范围(5.0×10-7mol.L-1~2.5×10-4mol.L-1),检出限为2.0×10-7mol.L-1。该电极用于地表水中苯酚含量检测,并与标准方法4-氨基安替比林分光光度法作了对照,结果满意。A novel amperometric phenol sensor was constructed through the covalent binding of L - cysteamine tailed porhyrin Cu （Ⅱ） （CuL） on a gold electrode by using the serfassembly technique. The electrode shows good electrochemical activity with one pair of redox peaks （ Epa = 0.09 V ,Epc = - 0.06 V） in pH 7.0 PBS between - 0.4 V ～ 0.5 V （ vs. SCE）. The results show that phenol can be oxidized by immobilized CuL to form a detectable product which is detected at 0.1 V without any mediator. The phenol sensor exhibits a fast response （less than 10 s）. The linear range for phenol detection is from 5.0×10^-7 mol·L^-1 ～2.5×10^-4 mol·L^-1 with a detection limit of 2.0×10^-7 mol·L^-1. This proposed modified electrode also shows excellent reproducibility and stability that makes it an ideal candidate for amperometric detection of phenol in real natural waters.

关 键 词：L-半胱胺卟啉铜(Ⅱ) 苯酚传感器 电催化氧化 自组装修饰Au电极 

分 类 号：O657.1[理学—分析化学]