Grupo IEC, Departamento de Ingeniería Química y Nuclear, E.T.S.I. Industriales, Universitat Politècnica de València, P.O. Box 22012, E-46071, Valencia, Spain; Departamento de Materiais, PPGE3M, Universidade Federal do Rio Grande do Sul. Avenida Bento Gonçalves, 9500, Porto Alegre, Brazil.
Grupo IEC, Departamento de Ingeniería Química y Nuclear, E.T.S.I. Industriales, Universitat Politècnica de València, P.O. Box 22012, E-46071, Valencia, Spain.
Chemosphere. 2018 Nov;210:615-623. doi: 10.1016/j.chemosphere.2018.07.057. Epub 2018 Jul 17.
The roles of the anode material, boron-doped diamond (BDD), with different boron (B) and substrate Silicon (Si) or Niobium (Nb) content, and one dimensionally stable anode (DSA), were evaluated in the oxidation of norfloxacin (NOR) by electrochemical advanced oxidation process (EAOP). The effect of other components in real wastewater on the performance of EAOP was also studied. The anode materials were characterized by cyclic voltammetry, regarding diamond quality, electro-generation of oxidants and NOR oxidation mechanism (direct and/or indirect). The results showed that the anode material influences on the NOR oxidation pathway, due to distinct characteristics of the substrate and the coating. Apparently, low difference in diamond-sp³/sp-carbon ratio (Si/BDD × Si/BDD) does not leads to significant differences in the EAOP. On the other hand, the variation in the sp³/sp ratio seems to be higher when Si/BDD and Nb/BDD are compared, which would explain the best current efficiency result for Si substrate. However, the Nb substrate presented a similar current efficiency and a 60% lower energy consumption. Dissolved organic matter (DOM) present in the real wastewater affect the EAOP-Nb/BDD due to HO and persulfate ions scavenged. However, when supporting electrolyte was added to a real wastewater spiked with NOR, the NOR decay reaches similar values found to the synthetic one. Due to the energy saving and mechanical properties, Nb substrate presents some technological advantages in relation to Si, which can facilitate the application to industrial levels.
不同掺硼量（B）和基底硅（Si）或铌（Nb）的阳极材料硼掺杂金刚石（BDD）和一维稳定阳极（DSA）在电化学高级氧化工艺（EAOP）氧化诺氟沙星（NOR）中的作用进行了评估。还研究了实际废水中其他成分对 EAOP 性能的影响。通过循环伏安法对阳极材料进行了表征，以研究金刚石质量、氧化剂的电生成以及 NOR 氧化机制（直接和/或间接）。结果表明，由于基底和涂层的不同特性，阳极材料对 NOR 氧化途径有影响。显然，Si/BDD 和 Si/BDD 之间的 sp³/sp 碳比率差异不大不会导致 EAOP 产生显著差异。另一方面，当 Si/BDD 和 Nb/BDD 进行比较时，sp³/sp 比率的变化似乎更高，这可以解释 Si 基底的最佳电流效率结果。然而，Nb 基底表现出相似的电流效率和 60%更低的能耗。实际废水中存在的溶解有机物（DOM）由于 HO 和过硫酸盐离子的消耗而影响到 EAOP-Nb/BDD。然而，当向含有 NOR 的实际废水添加支持电解质时，NOR 的衰减达到与合成废水相似的值。由于节能和机械性能，Nb 基底在技术上相对于 Si 具有一些优势，这有利于将其应用于工业水平。
