期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 56, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2023.104440
关键词
Electro-reduction; Oxalate; Potassium permanganate; Mn(III)-OA; Diclofenac
Oxalate promotes the activation of permanganate for the degradation of diclofenac, but its effect is pH-dependent, and sufficient concentration is required for stabilizing Mn(III)-OA.
Although electrochemical activation of permanganate (E-PM) is a green and efficient method to degrade refractory organics by in-situ generated reactive Mn(III)aq, this process highlights on the presence of promoter and/ or stabilizer. Oxalate (OA) is a widespread organic chelate in natural water bodies (with concentrations up to 1 mM), but whose effect on the E-PM process is still unclear. In this study, we found electrolysis and the presence of OA both promote the activation of PM for the degradation of diclofenac (DCF), showing a high synergistic coefficient (3.23) and elevated reaction constant (0.1395 min-1). Nevertheless, this process is highly pHdependent, behaving decreased reactivity as pH value increasing from 3 to 11. Sufficient concentration of OA (>= 0.5 mM in this study) is required for stabilizing Mn(III). UV-vis spectra, visual evidence and quenching experiments identified the presence and dominant role of Mn(III)-OA on the degradation of DCF. Using chronoamperometry, we confirmed Mn(III)-OA was primarily generated from the electro-reduction of PM in the presence of OA at pH 5.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据