Degradation of Diclofenac Sodium by Pre-magnetization Fe0/Persulfate System: Efficiency and Degradation Pathway Study
2020
Li, Xiang | Jia, Yan | Zhou, Minghua | Ding, Linjie | Su, Xianfa | Sun, Jianhui
The degradation of diclofenac sodium (DCF) in pre-magnetization Fe⁰/persulfate (Pre-Fe⁰/PS) and Fe⁰/PS systems were studied in detail in this study. The influencing operational conditions (initial PS dosage, Fe⁰ dosage, and pH) were studied for their effects on the DCF degradation. The removal rate constant for DCF by the Pre-Fe⁰/PS system was 2.1–6.2 times higher than that of the Fe⁰/PS system. A higher TOC removal efficiency (81.5%) was observed during the mineralization of DCF in the Pre-Fe⁰/PS process than that of the Fe⁰/PS process (70%). The results of electron paramagnetic resonance (EPR) confirmed that the Pre-Fe⁰/PS system could produce much more •OH and SO₄⁻• at a faster rate than the Fe⁰/PS system. Moreover, the degradation mechanism of DCF by the Pre-Fe⁰/PS process was elucidated. This work would provide a perspective on the Pre-Fe⁰/PS process for efficient degradation of DCF, exhibiting advantages to removing DCF, such as broaden the range of working pH and reduce the amount of chemicals. So, it is an efficient and potential method to remove DCF from wastewater by the Pre-Fe⁰/PS process.
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