Removal of meropenem from environmental matrices by electrochemical oxidation using Co/Bi/TiO2 nanotube electrodes,Environmental Science: Water Research & Technology

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Removal of meropenem from environmental matrices by electrochemical oxidation using Co/Bi/TiO2 nanotube electrodes
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-07-02 , DOI: 10.1039/d0ew00184h
Amir Ahmadi _{1,

2,

3} , Bernhard Vogler _{2,

3,

4,

5} , Yang Deng _{3,

6,

7,

8} , Tingting Wu _{1,

2,

3}

Affiliation

Degradation of meropenem via electrochemical oxidation was investigated for the first time. A TiO₂ nanotube array (TiO₂ NTA) was modified by co-doping cobalt and bismuth (Co/Bi/TiO₂ NTA) to enhance the anode stability/lifetime and the generation of reactive oxygen species (ROS, e.g. ˙OH). A series of anodic oxidation tests were carried out to study the effects of operating parameters, including current density (4–12 mA cm⁻²) and presence of different ions (Cl⁻, HCO₃⁻, and SO₄²⁻), on the degradation of meropenem. With an applied current density of 10 mA cm⁻² and an initial concentration of 500 μg L⁻¹, ∼94% of meropenem was removed in 15 min. The presence of Cl⁻ and SO₄²⁻ accelerated meropenem degradation, while HCO₃⁻ suppressed the removal. The transformation products were also investigated using 2D-NMR and LC/MS, where C₇N₂O₂H₁₂ was identified as one of the main intermediates. Results from CV measurements and scavenger tests indicated that both direct degradation and indirect reaction via the formation of ROS contributed to meropenem removal. Electrochemical oxidation of meropenem (500 μg L⁻¹) was also evaluated in environmental matrices, where ∼77% removal (E_EO 6.988 kW h m⁻³) with ∼56% TOC mineralization and ∼73% removal (E_EO 9.026 kW h m⁻³) with ∼55% TOC mineralization were achieved in RO concentrate (10 mA cm⁻²) and secondary effluent (4 mA cm⁻²), respectively. According to the accelerated lifetime test results, the lifetime of Co/Bi/TiO₂ NTA anode under 40, 20, 10, and 5 mA cm⁻² can be estimated to be 1337, 5873, 25 806, and 113 383 hours, respectively, demonstrating the great potential of Co/Bi/TiO₂ NTA as a stable and cost-effective anode material for the removal of recalcitrant organic pollutants from environmental matrices.

中文翻译：

使用Co / Bi / TiO2纳米管电极通过电化学氧化从环境基质中去除美罗培南

首次研究了美罗培南通过电化学氧化降解的方法。通过共掺杂钴和铋（Co / Bi / TiO ₂ NTA）对TiO ₂纳米管阵列（TiO ₂ NTA）进行改性，以提高阳极稳定性/寿命和活性氧（ROS，例如egOH）的生成。一系列的阳极氧化进行了试验，研究操作参数，包括电流密度（4-12毫安厘米的效果^-2）和不同的离子（CL的存在^-，HCO ₃^-和SO ₄^2-），上美罗培南的降解。施加10 mA cm ^-2的电流密度初始浓度为500μgL ^-1，在15分钟内去除了约94％的美洛培南。氯的存在下^-及SO ₄^2-加速美罗培南降解，而HCO ₃^-抑制去除。还使用2D-NMR和LC / MS研究了转化产物，其中C ₇ N ₂ O ₂ H ₁₂被确定为主要中间体之一。CV测量和清除剂测试的结果表明，通过降解ROS引起的直接降解和间接反应均有助于美罗培南的去除。美罗培南（500μgL ^-1的电化学氧化）也进行了评价在环境矩阵，其中~77％的去除（Ë _EO 6.988千瓦HM ^-3）与~56％TOC矿化和~73％的去除（Ë _EO 9.026千瓦HM ^-3）与〜55％TOC矿化分别实现分别在RO精矿（10 mA cm ^-2）和二次流出液（4 mA cm ^-2）中进行处理。根据加速寿命测试结果，Co / Bi / TiO ₂ NTA阳极在40、20、10和5 mA cm ^-2下的寿命可以分别估计为1337、5873、25806和113383小时。，证明了Co / Bi / TiO ₂的巨大潜力 NTA是一种稳定且具有成本效益的阳极材料，用于从环境基质中去除顽固的有机污染物。

更新日期：2020-07-31

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