高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

改性碳纳米管-钛电极的制备及其电催化氧化应用

郭新,刘淼   

  1. 吉林大学新能源与环境学院
  • 收稿日期:2025-09-09 修回日期:2025-10-20 网络首发:2025-10-22 发布日期:2025-10-22
  • 通讯作者: 刘淼 E-mail:liumiao@jlu.edu.cn
  • 基金资助:
    吉林省能源局项目（批准号：3D516l911425）资助

Preparation and Electrochemical Degradation of Ti/Nafion-CNTs/La-PbO2 Electrode

Xin GUO,Miao Liu   

  1. College of New Energy and Environment, Jilin University
  • Received:2025-09-09 Revised:2025-10-20 Online First:2025-10-22 Published:2025-10-22
  • Contact: Miao Liu E-mail:liumiao@jlu.edu.cn
  • Supported by:
    Supported by the Project of the Energy Bureau of Jilin Province of China(No.3D516l911425)

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摘要： 以经过处理的钛板作为基体，使用全氟磺酸-碳纳米管膜(Nafion-CNTs)修饰钛板，再通过电沉积法制备成改性碳纳米管-钛电极(Ti/Nafion-CNTs/ La-PbO2)，并用于降解甲基橙(MO)。红外光谱图显示经过酸洗活化的CNTs中富含羟基和羧基等活性官能团，提高了CNTs活性和亲水性。利用扫描电镜和高倍光学显微镜研究了修饰电极的表面形貌，电极表面晶体结构呈现5 μm的突起，不规则的紧密排列。通过X射线衍射仪(XRD)研究了电极表层电沉积的晶体结构，从谱图中可以看到镧元素进入PbO2的晶体结构中，引起晶格结构的变化。通过研究电导率测定、羟基自由基的生成测定和对MO的去除率，对不同的电极的电化学行为和电化学催化能力进行了对比和分析，结果表明改性电极的电催化性能明显增强，Ti/Nafion-CNTs/ PbO2电极表现出低电阻率和高羟基产生率，20 min时MO去除率达到70.52 %，60 min后降解彻底。用制备的改性电极作为阳极，研究在不同条件下改性电极对苯酚处理能力，去除率与电流呈正相关，且在板间距为10 mm时保持稳定，在pH值为6且板间距为10 mm时去除率最高。

关键词: 钛基电极, 碳纳米管, 全氟磺酸, 电催化氧化

Abstract: A titanium electrode (Ti) modified with Nafion-carbon nanotubes film (Nafion-CNTs) and electro-deposition of lead dioxide adding lanthanum (La-PbO2) was constructed and used to degrade methyl orange (MO) benefiting from the feature of low resistance and the special construction of carbon nanotubes. Infrared spectroscopy shows that activated CNTs are rich in active functional groups such as hydroxyl and carboxyl groups, which increase the activity and hydrophilicity of CNTs. The surface morphology of the modified electrode was characterized using scanning microscopy and high-power optical microscope. The crystal structure on the surface of the electrode exhibits irregular protrusions of 5 μm arranged in a dense pattern. Analysis of the crystal structure of the electrode surface layer deposited by electrolysis was conducted using X-ray diffraction (XRD). It is known that lanthanum enters the crystal structure of PbO2 and causes changes in the lattice structure.The electrochemical behavior of the modified electrode was investigated by a conductivity test. The degradation capability of modified electrode was investigated by determining the formation of hydroxyl free radical and the removal of MO. The electrocatalytic performance of the modified electrode is significantly enhanced. The degradation efficiency was evaluated by degrading phenol under different current, pH and plate spacing. The experimental results indicated that the Ti/Nafion-CNTs/La-PbO2 electrode displayed a low conductivity and high radical productive ratio. The MO removal rate reached 70.52 % at 20 min, and thoroughly degraded after 60 min, which was a remarkable enhancement compared to the unmodified Ti/PbO2 electrode. Using the prepared modification electrode as the anode, phenol was treated under different conditions, and the results showed that he removal rate was positively correlated with the current and stable at plate spacing of 10 mm. The maximum removal rate occurred at pH 6 and plate spacing of 10 mm.

Key words: Titanium anode, Carbon nanotube, Nafion, Advanced oxidation

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