Li Jiajun, Guo Ming, Shao Yan, Yu Hongwei, Ni Kaijie
College of Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, China.
College of Science, Zhejiang A&F University, Hangzhou, Zhejiang 311300, China.
ACS Omega. 2021 Feb 19;6(8):5436-5444. doi: 10.1021/acsomega.0c05651. eCollection 2021 Mar 2.
To improve the efficiency of electrochemical degradation of wastewater, lead dioxide was synthesized by a hydrothermal method with low cost, simple operation, and high conversion rate. β-PbO/HNT composites were prepared by a hydrothermal method with Halloysite nanotubes (HNTs) and β-PbO. The PbO/HNT/ITO electrode was prepared by modifying the β-PbO/HNT composite on an indium tin oxide (ITO) conductive glass electrode. The morphology of the material was characterized by scanning electron microscopy and transmission electron microscopy. The electrochemical performance of the electrode was measured by cyclic voltammetry, the galvanostatic charge-discharge method, and the AC impedance method. Electrolysis of typical dye wastewater by electrochemical oxidation was carried out. The effect of electrochemical degradation of wastewater with new electrodes was investigated and the degree of electrodes falling off was compared. The solubility of electrodes was investigated by inductively coupled plasma mass spectrometry lead element analysis of wastewater. The results showed that the β-PbO/HNT electrodes were prepared successfully and had good charge-discharge performance and lifetime. The removal rate of electrolytic dye wastewater was 85.86%, and the degradation effect was better than that of pure PbO electrodes. In this work, a new type of β-PbO/HNT/ITO electrode has been prepared, which improved the degradation efficiency of wastewater and opened up the prospect of HNT application.
为提高废水的电化学降解效率，采用水热法合成了二氧化铅，该方法成本低、操作简单且转化率高。通过水热法用埃洛石纳米管（HNTs）和β-PbO制备了β-PbO/HNT复合材料。通过在氧化铟锡（ITO）导电玻璃电极上修饰β-PbO/HNT复合材料制备了PbO/HNT/ITO电极。用扫描电子显微镜和透射电子显微镜对材料的形貌进行了表征。用循环伏安法、恒电流充放电法和交流阻抗法测量了电极的电化学性能。通过电化学氧化法对典型染料废水进行了电解。研究了新型电极对废水的电化学降解效果，并比较了电极脱落程度。通过电感耦合等离子体质谱法对废水中的铅元素进行分析，研究了电极的溶解度。结果表明，成功制备了β-PbO/HNT电极，其具有良好的充放电性能和使用寿命。电解染料废水的去除率为85.86%，降解效果优于纯PbO电极。本工作制备了一种新型的β-PbO/HNT/ITO电极，提高了废水的降解效率，开拓了HNT的应用前景。
