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首页> 外文期刊>RSC Advances >Enhanced electrochemical oxidation of phenol using a hydrophobic TiO2-NTs/SnO2-Sb-PTFE electrode prepared by pulse electrodeposition
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Enhanced electrochemical oxidation of phenol using a hydrophobic TiO2-NTs/SnO2-Sb-PTFE electrode prepared by pulse electrodeposition

机译：脉冲电沉积制备的疏水性TiO2-NTs / SnO2-Sb-PTFE电极增强了苯酚的电化学氧化

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In this study, novel Sb-doped SnO2 electrodes with a polyetrafluoroethylene (PTFE) composite were fabricated by pulse electrodeposition. In this process, vertically aligned TiO2 nanotubes (TiO2-NTs) formed by anodization of Ti plates served as the substrate for SnO2 eletrodeposition. Comparing with the conventional SnO2-Sb electrodes, TiO2-NTs/SnO2-Sb-PTFE electrodes have higher oxygen evolution potential, improved surface hydrophobicity, superior hydroxyl radical (HO center dot) generation and enhanced electrocatalytic activity by incorporation of PTFE nanoparticles. Field emission scanning electron microscopy (FESEM) shows that the surfaces of the PTFE composite electrodes exhibit a microspherical structure. Energy-dispersive X-ray spectroscopy (EDS) confirms the uniform distribution of Sn, Sb, F and C on TiO2-NTs/SnO2-Sb-PTFE surfaces. More importantly, the electrodes exhibit a distinctive improvement of oxygen evolution potential (OEP) from 2.0 to 2.4 V (vs. Ag/AgCl). The electrochemical impedance of TiO2-NTs/SnO2-Sb-PTFE also decreases significantly compared with Ti/SnO2-Sb(conventional). The electrocatalytic performance of TiO2-NTs/SnO2-Sb-PTFE compared with Ti/SnO2-Sb(conventional) and TiO2-NTs/SnO2-Sb were investigated using phenol as the model pollutant. The effects of initial solution pH and types of supporting electrolyte were investigated. The removal efficiency of total organic carbon (TOC), specific UV absorbance at 254 nm (SUVA(254)), mineralization current efficiency (MCE) and energy consumption (Ec) with respect to different PTFE loadings on the electrodes were investigated. The anodic leaching of Sn ions was also studied under different conditions.
机译：在这项研究中，通过脉冲电沉积制备了具有聚四氟乙烯（PTFE）复合材料的新型掺锑锑锡电极。在此过程中，通过对Ti板进行阳极氧化形成的垂直排列的TiO2纳米管（TiO2-NTs）用作SnO2电沉积的基材。与传统的SnO2-Sb电极相比，TiO2-NTs / SnO2-Sb-PTFE电极具有更高的析氧潜能，改善的表面疏水性，优异的羟基自由基（HO中心点）生成能力以及通过引入PTFE纳米粒子而增强的电催化活性。场发射扫描电子显微镜（FESEM）显示，PTFE复合电极的表面呈现微球形结构。能量色散X射线光谱（EDS）证实了TiO2-NTs / SnO2-Sb-PTFE表面上Sn，Sb，F和C的均匀分布。更重要的是，电极显示出从2.0 V至2.4 V（vs。Ag / AgCl）的析氧潜能（OEP）显着提高。与传统的Ti / SnO2-Sb相比，TiO2-NTs / SnO2-Sb-PTFE的电化学阻抗也显着降低。以苯酚为模型污染物，研究了TiO2-NTs / SnO2-Sb-PTFE与Ti / SnO2-Sb（常规）和TiO2-NTs / SnO2-Sb的电催化性能。研究了初始溶液pH值和支持电解质类型的影响。针对电极上不同的PTFE负载，研究了总有机碳（TOC）的去除效率，254 nm处的特定UV吸光度（SUVA（254）），矿化电流效率（MCE）和能耗（Ec）。还研究了在不同条件下Sn离子的阳极浸出。

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