镉在羧基化石墨烯电极上的电化学研究  

Electrochemical research of cadmium on carboxylated graphene electrode

作　　者：王正玮[1] 高云涛[1] 王振峰[1] 闫莉莉[1] 张宏教[1] 赵杰[1] 

机构地区：[1]云南民族大学化学与生物技术学院,民族药资源化学国家民委-教育部重点实验室,云南昆明650500

出　　处：《化学研究与应用》2013年第8期1078-1084,共7页Chemical Research and Application

基　　金：云南省社会发展科技项目(2007B148M)资助;民族药资源化学国家民委-教育部重点实验室开放基金项目(MJY07010)资助;2011年研究生创新项目(11HXYJS07)资助

摘　　要：本实验制备了羧基化的氧化石墨烯,并将其修饰在玻碳电极(GCE)表面制备了羧基化石墨烯/玻碳电极(GO-COOH/GCE),以此为工作电极研究了镉在GO-COOH/GCE上的电化学行为及测定方法。与裸玻碳电极(GCE)相比,GO-COOH膜修饰玻碳电极能显著加强镉的氧化还原峰电流。在pH=4.5的NaAc-HAc缓冲溶液中,镉在GO-COOH/GCE电极上出现1组氧化还原峰,Epa=-0.81 V,Epc=-0.93 V,△E=0.12 V;ipa=8.04μA,ipc=8.54μA,ipa/ipc=0.94。氧化峰电流与Cd2+浓度在5.5×10-7～7.5×10-6g.L-1(r=0.9969)范围内呈良好的线性关系,检出限为2.0×10-7g.L-1。实际样品测定的RSD为1.2%(n=5),平均回收率为101.3%。GO-COOH膜对镉的电化学氧化有明显的催化作用,本法是一种可靠、快捷、灵敏的检测方法,可以用于保健品螺旋藻药片中镉含量的测定。We synthesized the carbonylated graphene,which was used to modify glassy carbon electrode surface to prepare carbonylated graphene modified glassy carbon electrode（GO-COOH/GCE）.And the electrochemical behavior on the electrode was investigated.The oxidation peak current of cadmium increased remarkably at the GO-COOH/GCE in contrast to that at the bare GCE.One pair of redox peaks of cadmium at GO-COOH/GCE are obtained by cyclic voltammetry in NaAc-HAc buffer solution（pH=4.5）.Epa=-0.81 V,Epc=-0.93 V,△E=0.12 V;ipa=8.04 μA,ipc=8.54 μA,ipa/ipc=0.94.A sensitive and convenient（differential pulse voltammetry,DPV）analysis method of cadmium was established based on the electrochemical behavior.The oxidiztion peak is linearly related to the concentration of cadmium in the range of 5.5×10-7 to 7.5×10-6 g·L-1（r=0.9969）with a detection limit of 2.0×10-7 g·L-1,the RSD for cadmium was 1.2%（n=5）and an average recovery rate of 101.3%was achieved.The GO-COOH/GCE exhibits catalytic activity to the oxidation of cadmium.The proposed method was used to determine the concentration of cadmium in spirulina tablets.

关 键 词：羧基化石墨烯 镉 循环伏安法 差分脉冲伏安法 螺旋藻 

分 类 号：O657.1[理学—分析化学]