石墨烯修饰碳糊电极循环伏安法测定铜离子

Investigation of Cu^(2+) Electrochemical Behavior Using Graphene Modified Carbon Electrode

用石墨烯修饰碳糊电极,采用循环伏安法在BR缓冲溶液中测定Cu2+的电化学行为。研究了不同条件对Cu2+电化学测定的影响。实验表明,石墨与石墨烯比例为8∶1,pH=3.5,扫描速度为100mV/s进行循环伏安法测定时,在0.136V左右处出现一个峰形较好的特征吸收峰;峰电压与Cu2+浓度在5×10-8~1×10-4 mol/L范围内呈良好的线性关系,相关系数为0.9905,检出限为5.572×10-8 mol/L;连续测定两周,电极表现出较好的稳定性。

Graphene modified carbon paste electrode was used to determine the electrochemical behavior of Cu^2＋ in BR buffer solution under different conditions using cyclic voltammetry. As shown by the experimental results, when the proportions of graphite and graphene was 8：1 and the pH value of the buffer solution was 3.5 a well developed characteristic absorption peak was observed at about 0. 136V using cyclic voltammetry at 100mV/s scanning speed; The peak voltage varied linearly with the concentration of Cu^2＋ over the range from 5.0×10^-8 to 1.0×10 ^-4mol/L with the correlation coefficient of 0. 9905 and the detection limit of 5. 572 × 10^-8 mol/L; Continuous observation for two weeks showed a high stability of the modified electrode.