基于WO3/AuNPs/FTO的光电化学法检测自来水中的钴离子  

Photoelectrochemical Detection of Cobalt Ion （Ⅱ） Based on WO3/AuNPs/FTO Electrode

作　　者：郑晨琰 李百川 陈晓梅 陈曦[2] ZHENG Chen-Yan;LI Bai-Chuan;CHEN Xiao-Mei;CHEN Xi(College of Food and Biological Engineering,Jimei University,Xiamen 361021,China;College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]集美大学食品与生物工程学院,厦门361021 [2]厦门大学化学化工学院,厦门361005

出　　处：《分析化学》2020年第3期371-377,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.21675062);福建省自然科学基金项目(No.2017J05053)资助~~

摘　　要：建立了一种快速检测钴离子(Co^2+)的光电化学方法。首先在掺氟的SnO2透明导电玻璃(FTO)表面电沉积金纳米颗粒(AuNPs),再通过水热法在AuNPs/FTO表面生长WO3,得到WO3/AuNPs/FTO。通过扫描电镜和X射线衍射对WO3/AuNPs/FTO电极的表面形貌和晶格特征进行了表征。结果表明,AuNPs均匀分布在FTO表面,WO3呈垂直板状阵列生长。当体系中含有一定量的乙醇和Co^2+时,由于Co^2+与乙醇的醇羟基的配位作用,抑制了乙醇捕获光生空穴的能力,对WO3/AuNPs/FTO的光电流产生明显抑制作用。在优化的条件下,光电流降低程度与Co^2+浓度在0.5~7.0μmol/L范围内呈线性关系,检出限为0.3μmol/L(3s/k)。将本方法用于自来水中Co^2+含量测定,回收率为98.3%~110.0%;用于维生素B12中Co^2+含量的检测,测定值与国标法的结果接近,说明本方法具有较高的准确度,可望应用于实际样品中Co^2+含量检测。A photoelectrochemical(PEC)method was constructed for detection of Co^2+based on a WO3/AuNPs/FTO electrode.Gold nanoparticles(AuNPs)were electrochemically deposited on the surface of FTO and then tungsten trioxide(WO3)with vertically aligned plate-like structure was hydrothermally grown on the surface of AuNPs/FTO.The WO3/AuNPs/FTO was characterized by scanning electron microscopy and X-ray diffraction(XRD)patterns.From the PEC results,Co^2+had a weak inhibition effect on the photocurrent of WO3/AuNPs/FTO.After addition of ethanol,the photocurrent decreased obviously.On this basis,a sensitive PEC platform was constructed for monitoring Co^2+in the range of 0.5-7.0μmol/L with a detection limit of 0.3μmol/L.The recovery was from 98.3%to 110.0%,indicating that this method had good accuracy and was expected to be applied to the detection of Co^2+in real samples.

关 键 词：光电化学 三氧化钨 金纳米颗粒 钴离子 自来水 

分 类 号：O657.1[理学—分析化学] TU991.2[理学—化学]