Xu Yangchun, Feng Ruizhi, Zhang Minglu, Yan Caigan, Liu Junyu, Zhang Tingting, Wang Xiaohui
Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Beijing Bishuiyuan Membrane Technology CO., Ltd., Beijing 101400, China.
J Environ Sci (China). 2023 Apr;126:590-601. doi: 10.1016/j.jes.2022.04.027. Epub 2022 May 2.
In this study, we fabricated a blue-TiO/PbO-carbon nanotube (CNT) electrode in which blue TiO nanotube arrays (blue-TNA) served as the substrate for PbO-CNT eletrodeposition. Scanning electron microscope (SEM) showed compact surface structure of the electrode. The β-PbO crystal structure was detected by X-ray diffraction (XRD). The distribution of Pb, O, C, and Na elements on the electrode surface have been confirmed by X-ray photoelectron spectroscopy (XPS). Blue-TiO/PbO-CNT electrode had higher response current (213.12 mA), larger active surface area and lower charge transfer resistance (2.22 Ω/cm) than conventional TiO/PbO-CNT electrode. The influences of current density, initial phenol concentration, initial solution pH, and NaSO concentration on the electrochemical oxidation of phenol have been analyzed. The results showed that the 100 mg/L phenol could be destroyed completely after 210 min, and chemical oxygen demand (COD) removal rate was 89.3% within 240 min. Additionally, the electrode showed long actual lifetime (5468.80 hr) and low energy consumption (0.08 kWh/gCOD). A phenol degradation mechanism was proposed by analyzing the intermediate products with high-performance liquid chromatography-mass spectrometry (HPLC-MS). Importantly, the blue-TiO/PbO-CNT electrode exhibited superior stability and high degradation efficiency after 15 times reuse, demonstrating its promising application potential on phenol-containing wastewater treatment.
在本研究中，我们制备了一种蓝色TiO/PbO-碳纳米管（CNT）电极，其中蓝色TiO纳米管阵列（蓝色-TNA）作为PbO-CNT电沉积的基底。扫描电子显微镜（SEM）显示该电极表面结构致密。通过X射线衍射（XRD）检测到了β-PbO晶体结构。通过X射线光电子能谱（XPS）确定了电极表面Pb、O、C和Na元素的分布。与传统的TiO/PbO-CNT电极相比，蓝色TiO/PbO-CNT电极具有更高的响应电流（213.12 mA）、更大的活性表面积和更低的电荷转移电阻（2.22 Ω/cm）。分析了电流密度、初始苯酚浓度、初始溶液pH值和NaSO浓度对苯酚电化学氧化的影响。结果表明，100 mg/L的苯酚在210分钟后可被完全降解，在240分钟内化学需氧量（COD）去除率为89.3%。此外，该电极显示出较长的实际使用寿命（5468.80小时）和较低的能耗（0.08 kWh/gCOD）。通过高效液相色谱-质谱联用（HPLC-MS）分析中间产物，提出了苯酚降解机理。重要的是，蓝色TiO/PbO-CNT电极在重复使用15次后仍表现出优异的稳定性和高降解效率，证明了其在含酚废水处理方面具有广阔的应用潜力。
