期刊
CHEMOSPHERE
卷 216, 期 -, 页码 248-257出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.10.012
关键词
Peroxymonosulfate; BiOCl@Fe3O4; Atenolol; Degradation mechanism; Anion effect
资金
- National Natural Science Foundation of China [NSFC 21607116]
BiOCl@Fe3O4 photocatalyst was synthesized to activate peroxymonosulfate (PMS) for atenolol (ATL) degradation under simulated sunlight irradiation in present study. XRD, SEM, adsorbability and pore size distribution of BiOCl@Fe3O4 were analyzed. Magnetic BiOCl performed high activity in PMS activation and could be easily solid-liquid separation by applying an external magnetic field. Many parameters were inspected, including scavengers, PMS concentration, catalyst dosage, pH, anions (Cl- and CO3-). h(+), SO4 center dot-, HO center dot, O-2(center dot-), SO5 center dot- were involved in ATL degradation in BiOCl@Fe3O4/PMS/sunlight system. The second-order rate constant of the reaction between ATL and SO4 center dot- (k(ATL), (SO4-center dot)) was estimated via laser flash photolysis experiments. Moreover, ATL mineralization was followed by TOC analyzer. Twelve possible intermediate products were identified through LC-QTOF-MS analysis, and six ATL degradation pathways were concluded. This type of magnetic photocatalyst is characterized by ease of separation, high activation and good reusability. It may have application potential in refractory organic pollutants degradation. (C) 2018 Elsevier Ltd. All rights reserved.
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