Fabrication of PbO2/SnO2 composite anode for electrochemical degradation of 3-chlorophenol in aqueous solution
Fabrication of PbO2/SnO2 composite anode for electrochemical degradation of 3-chlorophenol in aqueous solution
复制标题
PbO2/SnO2复合阳极的制备用于电化学降解水溶液中的3-氯苯酚
DOI：
10.1016/j.apsusc.2019.07.161
复制
发表时间：
2019-11-15
影响因子：
6.7
通讯作者：
Chang, Limin
中科院分区：
文献类型：
--
作者：
Duan, Xiaoyue;Sui, Xinyu;Chang, Limin
采用简单的水热法制备了SnO 2纳米粒子，并将其用于3-氯苯酚（3-CP）的电化学氧化，制备了PbO 2/SnO 2电极。采用SEM、EDS、XRD、XPS等分析手段对样品的微观结构、元素分布、晶体结构和化学成分进行了表征。采用LSV和CV测试评价了电极的电化学性能。以对苯二甲酸为捕集剂，测定了电极中心点OH自由基产生量。此外，将PbO 2/SnO 2电极应用于水溶液中3-CP的电化学降解。结果表明，SnO 2纳米粒子的掺杂减小了PbO 2晶体的晶粒尺寸，提高了电极表面的Oads含量。与纯PbO 2电极相比，PbO 2/SnO 2 -1.0（SnO 2在电镀液中的浓度为1.0 g/L）电极具有更高的析氧电位、更强的直接氧化能力和中心点OH自由基产生能力，对3-CP的降解具有上级电化学活性。采用高效液相色谱法分析了3-CP电化学降解过程中形成的中间产物，并提出了可能的降解途径。此外，PbO 2/SnO 2 -1.0电极对3-氯苯酚的降解也表现出较高的重复使用性。
In present work, SnO2 nanoparticles were synthesized using simple hydrothermal process, and then a novel PbO2/SnO2 electrode was successfully fabricated using obtained SnO2 nanoparticles for electrochemical oxidation of 3-chlorophenol (3-CP). The microstructure, element distribution, crystal structure and chemical composition of samples were characterized by the analytical techniques including SEM, EDS, XRD and XPS. The electrochemical performances of electrodes were evaluated using LSV and CV measurements. The center dot OH radicals generation capacity of electrodes was determined using terephthalic acid as trapping agent. Moreover, the PbO2/SnO2 electrodes were applied in the electrochemical degradation of 3-CP in aqueous solution. The results show that the doping of SnO2 nanoparticles reduced the grain size of PbO2 crystal and improved the content of Oads on the surface of electrode. In contrast with the pure PbO2 electrode, the PbO2/SnO2-1.0 electrode (the concentration of SnO2 in electroplating solution was 1.0 g/L) exhibited higher oxygen evolution potential, stronger direct oxidation capacity and center dot OH radicals generation capacity, and superior electrochemical activity for degradation of 3-CP. The intermediates formed in electrochemical degradation of 3-CP were revealed by HPLC and a plausible degradation pathway was proposed. Furthermore, PbO2/SnO2-1.0 electrode also showed a high reusability for 3-CP degradation.