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电化学(中英文) ›› 2015, Vol. 21 ›› Issue (5): 488-495.  doi: 10.13208/j.electrochem.150603

• 研究论文 • 上一篇    下一篇

Pd/石墨烯/玻碳电极检测4-氯酚污染物的研究

石 鹏1,王伯轩1,宋泉霖1,王 辉1*,刘 新1,卞兆勇2   

  1. 1. 北京林业大学环境科学与工程学院,北京 100083;2. 北京师范大学水科学研究院,北京 100875
  • 出版日期:2015-10-28 发布日期:2015-10-28
  • 通讯作者: 王 辉 E-mail: wanghui@bjfu.edu.cn
  • 基金资助:

    北京市大学生科学研究与创业行动计划项目(No. S201410022103)、国家自然科学基金项目(No. 51278053,No. 21373032)

Application of Pd/Graphene Modified Electrode in the Detection of 4-Chlorophenol

SHI Peng1, WANG Bo-xuan1, SONG Quan-lin1, WANG Hui1*, LIU Xin1, BIAN Zhao-yong2   

  1. 1. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; 2. College of Water Sciences, Beijing Normal University, Beijing 100875, China
  • Published:2015-10-28 Online:2015-10-28
  • Contact: WANG Hui E-mail: wanghui@bjfu.edu.cn

摘要:

采用改进的Hummers法和硼氢化钠还原法制备Pd/石墨烯催化剂,并采用XRD、SEM、XPS、TEM等技术对其进行表征. 将该催化剂修饰于玻碳电极表面,制备出Pd/石墨烯/玻碳电极,使用循环伏安法研究了检测4-氯酚的最佳工作条件. 研究结果表明,所得石墨烯表面平整光滑,以零价态存在的Pd纳米颗粒均匀分散到石墨烯上,平均粒径为(6.5 ± 0.05) nm. 检测4-氯酚的最佳支持电解质为0.1 mol?L-1、pH = 6.8的磷酸-磷酸钠缓冲溶液(PBS),峰电流与扫描速率的平方根呈良好的线性关系(R2 = 0.992),该电极的线性范围为1 ~ 100 μmol?L-1 (R2 = 0.967),检测限为0.57 μmol?L-1 (S/N = 3),且具有良好的重现性和稳定性. 本文所研制的Pd/石墨烯/玻碳电极具有较高的催化活性,提供了一种简便快捷、重现性好的检测4-氯酚的方法.

关键词: 电化学检测, 氯酚, Pd/石墨烯, 修饰电极

Abstract:

The Pd/graphene composites were synthesized by a modified Hummers method and NaBH4 reduction process, and then were characterized using XRD, SEM, XPS, and TEM. The Pd/graphene modified glassy carbon electrode (Pd/graphene/GCE) was prepared based on this method. Cyclic voltammetry was used to study the optimum operation conditions for the 4-chlorophenol detection. It was shown that the surface of the graphene was smooth and Pd nanoparticles were uniformly dispersed on graphene. The average particle size was calculated to be 6.5 ± 0.05 nm. These nanoparticles exhibited high catalytic activity and sensitivity toward chlorophenols. PBS with a concentration of 0.1 mol?L-1 at pH 6.8 was the best supporting electrolyte for the detection of 4-chlorophenol. Peak current and the square root of the scan rate were in a good linear relationship (R2 = 0.992). Using the Pd/graphene/GCE analytical performance with the linear range from 1 to 100 μmol?L-1 (R2 = 0.967), a detection limit of 0.57 μmol?L-1 was obtained. The Pd/graphene/GCE had a good reproducibility and stability. Therefore, the Pd/graphene/GCE showed a high catalytic activity, which provides a simple, quick and reproducible method for the detection of 4-chlorophenol.

Key words: electrochemical detection, chlorophenol, Pd/graphene, modified electrode

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