基于洋麻秆衍生的三维多孔碳/硫堇比率型抗坏血酸电化学传感器

吴娜 申源 汪莉 宋永海

引用本文: 吴娜, 申源, 汪莉, 宋永海. 基于洋麻秆衍生的三维多孔碳/硫堇比率型抗坏血酸电化学传感器[J]. 分析化学, 2020, 48(12): 1650-1657. doi: 10.19756/j.issn.0253-3820.201419 shu
Citation:  WU Na,  SHEN Yuan,  WANG Li,  SONG Yong-Hai. On-Off Ratiometric Electrochemical Sensor for Ascorbic Acid Based on Three-dimensional Kenaf Stem Porous Carbon/Thinion Integrated Electrode[J]. Chinese Journal of Analytical Chemistry, 2020, 48(12): 1650-1657. doi: 10.19756/j.issn.0253-3820.201419 shu

基于洋麻秆衍生的三维多孔碳/硫堇比率型抗坏血酸电化学传感器

    通讯作者: 宋永海, yhsonggroup@hotmail.com
  • 基金项目:

    本文系国家自然科学基金项目(Nos.21765009,21964010,21465014,21665012)资助

摘要: 通过碳化洋麻秆得到三维多孔碳材料(3D-KSC),然后将硫堇(Thi)分子直接组装在其孔壁上,制备了比率型抗坏血酸(AA)电化学传感器。采用扫描电子显微镜和能谱仪等对3D-KSC进行结构表征,发现3D-KSC孔壁表面较光滑,同时还存在一些微孔和缺陷,这些孔隙与缺陷的存在,可使Thi分子牢固地固载到3D-KSC的孔壁上。3D-KSC/Thi修饰电极催化AA的氧化峰出现在0.015 V处,而Thi自身在-0.24 V处的氧化峰不随AA浓度的增加而改变,利用这两个氧化峰的峰电流密度之比设计了一种比率型AA电化学传感器。电化学测试结果表明,3D-KSC/Thi具有导电性能好、电阻值较小、电极与电解液间的离子扩散速率快等特点。3D-KSC/Thi对AA的检测具有良好的选择性、宽的线性范围(18.2 μmol/L~8.0 mmol/L)和低的检出限(6.0 μmol/L)。用于维生素片中AA含量测定,回收率为100.7%~101.2%,表明此传感器具有潜在的实际应用前景。

English


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  • 收稿日期:  2020-07-18
  • 修回日期:  2020-09-21
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