抗坏血酸在聚对苯二酚/铜复合膜修饰电极上电催化氧化行为的探究  

Electrocatalytic Oxidation Behavior of Ascorbic Acid on the Electrode Modified with PHQ/Cu Composite Film

作　　者：何春晓[1] 王妍[1] 魏晓霞[1] HE Chun-xiao;WANG Yan;WEI Xiao-xia(College of Chemistry and Chemical Engineering,Longdong University,Qingyang 745000,China)

机构地区：[1]陇东学院化学化工学院

出　　处：《食品工业科技》2020年第6期210-214,共5页Science and Technology of Food Industry

基　　金：甘肃省应用化学省级重点实验室项目(GSACK20130113);甘肃省民生科技计划项目(17CX1FM071)项目支撑

摘　　要：利用电沉积法制备了聚对苯二酚/铜(PHQ/Cu)复合膜修饰电极,并采用循坏伏安法探究了抗坏血酸(AA)在该电极上的电催化氧化行为。结果表明,与裸电极、PHQ修饰电极相比,PHQ/Cu复合膜修饰电极对AA具有更好的催化作用,表明两种修饰剂对AA的电催化氧化有良好的协同催化作用;在0.1 mol/L磷酸盐缓冲溶液(p H=4.35)中,AA的氧化峰电流与其浓度在5×10-4~1.0×10-1mol/L范围内呈良好的线性关系,线性方程为lgI=0.7364lgc+1.6932,R2=0.9959,检出限为2.0×10-5mol/L。该复合膜修饰电极在冰箱内贮存9 h,其电化学信号基本保持不变,且共存物几乎不干扰AA的测定,表明电极具有良好的稳定性和较强的抗干扰能力,可以用于饮料中AA含量的测定,回收率在95.5%~109.1%之间。In this paper,the electrodeposition method was used to prepare the glass carbon electrode modified with PHQ/Cu composite film( PHQ/Cu/GCE) and the electrocatalytic oxidation behavior of ascorbic acid( AA) on the electrode was studied by using cyclic voltammetry.The experimental results showed that compared with the bare GCE and PHQ/GCE,PHQ/Cu/GCE had better catalytic activity towards AA,which indicated that the composite film had a good synergistic catalytic action towards the electrooxidation reaction of AA.At the same time,in 0.1 mol/L phosphate buffer solution( pH = 4.35),the oxidation peak current of AA was in proportion to its concentration in the range of 5 × 10-4~1.0 × 10-1 mol/L.The regressive equation was lgI= 0.7364 lgc + 1.6932,R2= 0.9959,with a detection limit of 2.0 × 10-5 mol/L.The modified electrode was stored in refrigerator for 9 h,the electrochemical signal remained unchanged,and the coexisting substances hardly interfered with the determination of AA,which demonstrated that the modified electrode had good stability and strong anti-interference ability.Furthermore,the modified electrode was successfully used to determine the content of AA in drink with recoveries of 95.5% ~109.1%.

关 键 词：抗坏血酸 电催化氧化 电沉积法 循环伏安法 化学修饰电极 

分 类 号：TS201.2[轻工技术与工程—食品科学]