Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Chemosphere. 2019 Dec;237:124471. doi: 10.1016/j.chemosphere.2019.124471. Epub 2019 Jul 27.
Inability to remove biologically toxic and persistent contaminants is a critical issue in traditional water treatment processes. In this study, a novel 3D macroporous RuO (3D-RuO) electrode with uniform and interconnected cavities has been fabricated via templated electrodeposition approach for treatment of persistent pyrazole. The physicochemical properties of the electrodes are characterized by means of SEM, BET, XRD, LSV and CV measurements. The results show that structural features of the 3D-RuO play important roles in the electrocatalysis performance. Thanks to the abundant crystal defect sites, 3D-RuO electrode possesses more mesopores within the skeleton, resulting in 17.9 and 2.2 times larger specific surface area compared to traditional flat thermal-deposited (TF-RuO) and electrodeposited RuO (EF-RuO) respectively. At a current density of 5 mA cm, the pyrazole removal rate on 3D-RuO is 1.7 times and 1.3 times that of TF-RuO and EF-RuO. The energy consumption for 50% of pyrazole removal on 3D-RuO is 0.05 kWh gpyrazole, much lower than that of TF-RuO (0.11 kWh gpyrazole) and EF-RuO (0.075 kWh gpyrazole). The improved removal performance of 3D-RuO electrode is attributed to its strong electro-adsorption capacity (270.3 μg cm), leading to enhanced mass transfer of pollutants to the electrode surface. The mass transfer coefficient (κ) is estimated as 2.4 × 10 m s for 3D-RuO, which is 3.9 and 2.3 times as much as that of TF-RuO and EF-RuO. Finally, contribution of different electron transfer approaches to pyrazole degradation under anodic polarization was investigated by ROS scavenging experiments.
在传统水处理工艺中，无法去除生物毒性和持久性污染物是一个关键问题。在这项研究中，通过模板电沉积方法制备了一种具有均匀互联空腔的新型 3D 大孔 RuO（3D-RuO）电极，用于处理持久性吡唑。通过 SEM、BET、XRD、LSV 和 CV 测量对电极的物理化学性质进行了表征。结果表明，3D-RuO 的结构特征对电催化性能起着重要作用。由于丰富的晶体缺陷位，3D-RuO 电极在骨架内具有更多的中孔，比传统的平面热沉积（TF-RuO）和电沉积（EF-RuO）分别大 17.9 和 2.2 倍。在 5 mA cm 的电流密度下，3D-RuO 上吡唑的去除率比 TF-RuO 和 EF-RuO 分别提高了 1.7 倍和 1.3 倍。在 3D-RuO 上去除 50%吡唑的能量消耗为 0.05 kWh gpyrazole，远低于 TF-RuO（0.11 kWh gpyrazole）和 EF-RuO（0.075 kWh gpyrazole）。3D-RuO 电极去除性能的提高归因于其强大的电吸附能力（270.3 μg cm），导致污染物向电极表面的传质增强。3D-RuO 的传质系数（κ）估计为 2.4×10 m s，是 TF-RuO 和 EF-RuO 的 3.9 和 2.3 倍。最后，通过 ROS 清除实验研究了不同电子转移方法对阳极极化下吡唑降解的贡献。
