聚对氨基苯甲酸/石墨烯-全氟磺酸-聚四氟乙烯共聚物修饰...

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聚对氨基苯甲酸/石墨烯-全氟磺酸-聚四氟乙烯共聚物修饰玻碳电极检测铜（Ⅱ）
杨剑鹏 黄克靖 王兰信阳师范学院化学化工学院,河南信阳464000

摘　要:将石墨烯（Gr）-nafion复合物滴涂到玻碳电极表面,然后通过电聚合将对氨基苯甲酸（p-ABA）修饰至电极表面制成聚对氨基苯甲酸/Gr-nafion修饰玻碳电极。利用差分脉冲溶出伏安法研究了Cu2＋在修饰电极上的电化学行为。试验发现Gr-nafion膜和聚合膜poly（p-ABA）的协同作用,提高了Cu2＋在电极表面的富集程度,有效地促进了电子在修饰电极上的传递速度。对实验参数进行优化,并通过考察发现传感器有良好的重现性,且一些常见的阳离子和阴离子对Cu2＋响应信号不产生干扰。在5.0×10-7～4.0×10-5 mol/L范围内,铜离子浓度与峰电流呈良好的线性关系,相关系数为0.995。方法检出限为5.0×10-9 mol/L（S/N=3）。方法应用于废水样中Cu2＋的测定,结果同ICP-AES法的测定结果相一致,相对标准偏差为2.4%～3.6%。由于循环伏安曲线中Cu2＋和Cd2＋的溶出峰电位差较大,且没有相互干扰,所以该电极可用于Cu2＋和Cd2＋的同时测定。[著者文摘]

关键词:聚对氨基苯甲酸 石墨烯 nafion 铜（Ⅱ） 差分脉冲溶出伏安法
分类号:　O657.15[著者标引]文献标识码：A文章编号：1000-7571（2012）04-0028-05栏目信息：
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Determination of copper（Ⅱ） based on poly（p-aminobenzoic acid）/graphene-Perfluorosulfonic acid-PTFE copolymer modified glassy carbon electrodeYANG Jian-peng, HUANG Ke-jing,WANG Lan Department of Chemistry, Xinyang Normal University, Xinyang 464000,China Abstract:Graphene-nafion composite was coated on glassy carbon electrode surface,and then p-aminobenzoic acid was modified on it to fabricate poly（p-aminobenzoic acid）/graphene-nafion modified glassy carbon electrodes by using electrochemical polymerization method.The electrochemical behavior of Cu2＋ at the modified electrode was investigated by differential pulse stripping voltammetry.It was found that Cu2＋ can be effectively concentrated and the rate of electron transfer can be improved on the modified electrode based on the synergetic effect of the Gr-nafion and poly（p-ABA） film.The experimental parameters were optimized.The results showed that the sensor had good reproducibility.Some anions and cations had no interference to the determination of Cu2＋ with the developed method.The peak currents were linearly dependent on the concentrations of Cu2＋ in the range from 5.0×10-7 mol/L to 4.0×10-5 mol/L with a coefficiency of 0.995.The detection limit was 5.0×10-9 mol/L（S/N = 3）.The proposed method was applied to the determination of Cu2＋ in waste water samples and the results were found to be in accordance with that detected by ICP-AES.The relative standard deviation was 2.4%-3.6%.The sensor could be used for the simultaneous determination of Cu2＋ and Cd2＋ because a big peak-to-peak separation was obtained in the cyclic voltammograms.[著者文摘]

Key words:poly（p-aminobenzoicacid） ; graphene ; nafion; Copper（ II ） ; differential pulse stripping vol-tammetry