Li Zou, Chen Li, He Fang, Bu Lijuan, Qin Xiaoli, Xie Qingji, Yao Shouzhuo, Tu Xinman, Luo Xubiao, Luo Shenglian
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
Talanta. 2014 May;122:285-92. doi: 10.1016/j.talanta.2014.01.062. Epub 2014 Jan 31.
Graphene oxide (GO)-thionine (TH) nanocomposite was prepared by π-π stacking. The nanocomposite was cast-coated on a glassy carbon electrode (GCE) to prepare an electroreduced GO (ERGO)-TH/GCE, then 2-mercaptoethanesulfonate (MES) was covalently tethered to ERGO-TH by potentiostatic anodization to form an ERGO-TH-MES/GCE. The thiolation reaction was monitored by electrochemical quartz crystal microbalance (EQCM). Square wave anodic stripping voltammetry (SWASV) was used to determine Cd(2+) and Pb(2+) at the ERGO-TH-MES/GCE further modified with Nafion and Bi. Under the optimal conditions, the linear calibration curves for Cd(2+) and Pb(2+) are from 1 to 40 μg L(-1), with limits of detection (S/N=3) of 0.1 μg L(-1) for Cd(2+) and 0.05 μg L(-1) for Pb(2+), respectively. The electrode was used for the simultaneous analysis of Cd(2+) and Pb(2+) in water samples with satisfactory recovery.
通过π-π堆积制备了氧化石墨烯（GO）-硫堇（TH）纳米复合材料。将该纳米复合材料铸涂在玻碳电极（GCE）上，制备出电还原氧化石墨烯（ERGO）-TH/GCE，然后通过恒电位阳极氧化将2-巯基乙烷磺酸盐（MES）共价连接到ERGO-TH上，形成ERGO-TH-MES/GCE。通过电化学石英晶体微天平（EQCM）监测硫醇化反应。采用方波阳极溶出伏安法（SWASV）在进一步用Nafion和Bi修饰的ERGO-TH-MES/GCE上测定Cd(2+)和Pb(2+)。在最佳条件下，Cd(2+)和Pb(2+)的线性校准曲线范围为1至40 μg L(-1)，Cd(2+)的检测限（S/N=3）为0.1 μg L(-1)，Pb(2+)的检测限为0.05 μg L(-1)。该电极用于同时分析水样中的Cd(2+)和Pb(2+)，回收率令人满意。
