金属Pd修饰复合电极的制备及对水环境中四环素的降解

Preparation of Metal Pd Modified Composite Electrode and Degradation of Tetracycline in Aqueous Environment

摘要: 随着医药行业和生活水平的快速发展，越来越多的人开始滥用抗生素，这对我们的水体环境和身体健康带来了严重的危害。及时处理抗生素类有机污染物对水体造成的污染问题，已经迫在眉睫。本文通过恒电流电沉积法制备金属Pd修饰的Pd-PANI/ITO复合电极，通过SEM、XRD、FTIR及XPS对电极的形貌、晶体结构和官能团组成等理化性质进行了表征分析，表征结果证明Pd和PANI成功负载到了ITO上。并以四环素废水的降解率为指标，筛选出制备Pd-PANI/ITO复合电极时的最佳参数条件：PANI的最佳沉积电流为2 mA，最佳沉积时间为10 min。Pd的最佳沉积电流为2 mA，沉积时间为10 min。将复合电极应用于对含有典型抗生素即四环素废水的电催化降解研究。降解过程中考察了四环素废水在不同时段的降解情况。研究了Pd-PANI/ITO电极的电催化活性及在不同降解电流条件下对四环素废水的降解性能，且结果表明Pd-PANI/ITO复合电极对四环素废水的电降解遵循准一级反应。

Abstract: With the rapid development of the pharmaceutical industry and living standards, more and more people have begun to use antibiotics, which has brought serious harm to our water environment and physical health. It is urgent to deal with the pollution caused by antibiotics organic pollutants in time and make it recyclable. In this paper, metal Pd-modified Pd-PANI/ITO composite electrodes were prepared by galvanostatic electrodeposition. The morphology, crystal structure and functional group composition of the electrodes were characterized by SEM, XRD, FTIR and XPS. Pd and PANI were successfully loaded onto ITO. Using the degradation rate of tetracycline wastewater as an index, the optimal parameters for the preparation of Pd-PANI/ITO composite electrodes were screened out: the optimal deposition current of PANI was 2 mA, and the optimal deposition time was 10 min. The optimum deposition current for Pd was 2 mA and the deposition time was 10 min. The composite electrode was applied to the electrocatalytic degradation of wastewater containing typical antibiotics, namely tetracycline. During the degradation process, the degradation of tetracycline wastewater at different time periods was investigated. The electrocatalytic activity of Pd-PANI/ITO electrode and the degradation performance of tetracycline wastewater under different degradation current conditions were studied, and the results showed that the electrodegradation of tetracycline wastewater by Pd-PANI/ITO composite electrode followed a pseudo-first-order reaction.