Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 5 Bd Descartes, 77454, Marne-la-Vallée, Cedex 2, France.
Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 5 Bd Descartes, 77454, Marne-la-Vallée, Cedex 2, France.
Chemosphere. 2020 May;247:125939. doi: 10.1016/j.chemosphere.2020.125939. Epub 2020 Jan 21.
The removal of the analgesic tramadol (TMD) from water was studied by electro-Fenton (EF) process using BDD anode. Hydroxyl radicals (OH) generated in this process are very strong oxidants and able to successfully oxidize TMD until its total mineralization in aqueous solution. The oxidative degradation of TMD was very rapid with complete disappearance of 0.1 mM (26.3 mg L) TMD in 10 min at 500 mA constant current electrolysis. The absolute (second order) rate constant for oxidation of TMD by OH was determined using competition kinetic method and found to be (5.59 ± 0.03) ✕ 10 M s. The quasi-complete mineralization of the 0.1 mM TMD solution was obtained in 6 h electrolysis at 500 mA current. Several oxidation reaction intermediates were identified using GC-MS analysis. Oxalic, glyoxylic and fumaric acids were identified and their evolution during electrolysis was followed along treatment. Ammonium and nitrate ions, released during the treatment, were also considered. Based on these data and TOC removal results, a possible mineralization pathway was proposed.
采用 BDD 阳极的电芬顿（EF）工艺研究了水中镇痛剂曲马多（TMD）的去除。该过程中生成的羟基自由基（OH）是非常强的氧化剂，能够成功地将 TMD 氧化至完全矿化。TMD 的氧化降解非常迅速，在 500 mA 恒电流电解 10 min 内完全消失 0.1 mM（26.3 mg L）TMD。采用竞争动力学法测定了 OH 氧化 TMD 的绝对（二级）速率常数，发现其值为（5.59 ± 0.03）✕10 M s。在 500 mA 电流下电解 6 h 可实现 0.1 mM TMD 溶液的准完全矿化。使用 GC-MS 分析鉴定了几种氧化反应中间体。鉴定了草酸、乙醛酸和富马酸，并在处理过程中跟踪它们的演变。还考虑了处理过程中释放的铵和硝酸盐离子。基于这些数据和 TOC 去除结果，提出了一种可能的矿化途径。
