The practical application and electron transfer mechanism of SR-Fenton activation by FeOCl
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The practical application and electron transfer mechanism of SR‑Fenton activation by FeOCl Lei Chen, et al. [full author details at the end of the article] Received: 1 May 2020 / Accepted: 10 October 2020 © Springer Nature B.V. 2020
Abstract An efficient FeOCl for persulfate (PS) and peroxymonosulfate (PMS) catalysis was synthesized by one-step method, followed by the exploration of structure and morphology using a range of techniques, such as XPS, FT–IR and SEM. Catalytic mechanism of FeOCl for PS and PMS was investigated to demonstrate its excellent catalytic performance. The results indicated that FeOCl had loose structure, large specific surface area and exposed active sites. Its strong Fe–O and Fe–Cl bonds could promote electron transfer, thereby accelerating the reduction of F e3+ and improving the catalytic rate and utilization rate of oxidants. Since FeOCl had unique and superior structure, it could be used to catalyze 2 persulfates PS and PMS to degrade tetracycline hydrochloride (TTCH) and had good degradation efficiency and degradation stability. When prepared at 250 °C, FeOCl had the best catalytic performance. After 60 min, the degradation rate of TTCH under FeOCl/PS system was 78%, and under FeOCl/PMS system was 81%. After ten cycles, the degradation rate of TTCH still reached 80%. And this catalytic system had wide adaptability to pH. This work highlighted the catalytic versatility of FeOCl in persulfate and proved its application in the treatment of toxic organic wastewater through actual wastewater treatment experiment, which provided a scientific basis for enhancing catalytic performance of FeOCl. Graphic abstract
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L. Chen et al.
Keywords FeOCl · SO4·− · Aops · Tetracycline hydrochloride · Fenton
Introduction One of the important goals of water purification and wastewater treatment is to remove toxic organic pollutants effectively [1–3]. The advanced oxidation processes (AOPs) show unique advantages in the degradation of toxic organic pollutants [4–6]. Because S O4·− has a higher redox potential than ·OH and can mineralize more toxic organic pollutants, the sulfate-based Fenton-like technology (SR-Fenton) has received more attention [7–9]. In addition, compared with ·OH, SO4·− has a longer half-life and can maintain higher activity in neutral or alkaline water [10, 11]. Therefore, it has greater advantages to use S O4·− to degrade the toxic organic pollutants with benzene ring structure in wastewater [12, 13]. SO4·− can be produced by activating PS and PMS through ultrasound and UV irradiations, carbon-based materials, semiconductors, transition metals and heat [14–16]. Due to the high efficiency and low cost, transition metals (such as Co, Mn and Fe) are considered as effective activators of SR-Fenton [17–21]. However, the carcinogenic effect of cobalt on the human body has limited the application of cobalt ions and cobalt-containing materials. Iron and iron-containing materials are widely used to activate persulfates due to their environmental friendliness
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