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Electrocatalytic Oxidation of Calcium Folinate on Carboxyl Graphene Modified CuxO/Cu Electrode
Li-wen Wang, Shou-guo Wu, Tian-yang Shi, Wei Wei, Pan Pan
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
Abstract:
Carboxyl graphene modified CuxO/Cu electrode was fabricated. The bare copper electrode was firstly anodic polarized in 1.0 mol/L NaOH solution in order to get CuxO nanoparticles, then the carboxyl graphene (CG) was electrodeposited on the CuxO/Cu electrode by cyclic potential sweeping. The electrocatalytic oxidation behaviors of calcium folinate (CF) at the graphene modified CuxO/Cu electrode were investigated by cyclic voltammetry. A positive scan polarization reverse catalytic voltammetry was used to obtain the pure catalytic oxidation current. The graphene modified CuxO/Cu electrode was served as the electrochemical sensor of CF, a highly sensitivity of 22.0 μA·(μmol/μL)-1cm-2 was achieved, and the current response was linear with increasing CF concentration in the range of 2.0×10-7 mol/L to 2.0×10-5 mol/L, which crossed three orders of magnitude, and the detection limit was found 7.6×10-8 mol/L (S/N=3). In addition, the proposed sensor was successfully applied in determination of CF in drug sample.
Key words:  Calcium folinate  Carboxyl graphene  CuxO/Cu electrode  Chemically modified electrode  Positive scan polarization reverse catalytic voltammetry
FundProject:
石墨烯/氧化铜纳米粒子/铜修饰电极对亚叶酸钙的电催化氧化及其分析应用
王立文, 吴守国, 史天洋, 魏巍, 潘攀
中国科学技术大学化学系, 合肥 230026
摘要:
采用阳极极化的方法在铜电极表面形成氧化铜纳米粒子,然后采用循环伏安法将羧基化石墨烯电沉积到上述电极表面,成功制备了石墨烯/氧化铜纳米粒子/铜电极,用于碱性溶液中亚叶酸钙的检测.采用循环伏安法对亚叶酸钙在修饰电极上的催化氧化行为进行了研究,阳极扫描极化反向催化伏安法应用于亚叶酸钙的检测.在2.0×10-7~2.0×10-5 mol/L范围内,该电极显示出良好的线性关系,灵敏度为22.0 μA·μL/(μmol/cm2),检测限达到7.6×10-8 mol/L(S/N=3),成功应用于实际样品的检测.
关键词:  亚叶酸钙  羧基化石墨烯  氧化铜纳米粒子  铜电极  化学修饰电极  阳极扫描极化反向催化伏安法
DOI:10.1063/1674-0068/29/cjcp1604079
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