Journal
WATER RESEARCH
Volume 185, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2020.116246
Keywords
Dissolved organic matter; Layered double hydroxide; Peroxymonosulfate
Funding
- National Natural Science Foundation of China [41972037, 41673092]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019B1515120015]
- Guangdong Science and Technology Program [2020B121201003]
- Guangdong Special Support Program for Millions of Leading Engineering Talents [201626011]
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In this study, peroxymonosulfate (PMS) activation of FeAl layered double hydroxide (FeAl-LDH) was enhanced by compounding dissolved organic matter (DOM). The characterization and catalytic performance of FeAl-LDH and DOM-LDH were investigated. The results revealed that the physicochemical properties of DOM-LDH were superior to FeAl-LDH: (i) The higher proportion of Fe(II) was found in DOM-LDH, mainly existed in the form of trans-coordinated octahedral Fe(II); (ii) DOM-LDH showed a flower-like morphology with larger specific surface area, pore width and pore volume; (iii) More functional groups and surface oxygen vacancies were found in DOM-LDH. Moreover, DOM promoted the process of PMS activation by accelerating Fe(III) reduction with humic acid-like compounds. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that more reactive oxygen species (ROS) were generated in DOM-LDH/PMS system, center dot OH was considered as the dominant ROS for Bisphenol A (BPA) degradation. As a result, the degradation efficiency for BPA (20 mg L-1) in FeAl-LDH/PMS system was increased from 60% to 93% within 60 min after the introduction of DOM. This work is expected to facilitate the design and application of Fe(II)/PMS system for environmental protection. (C) 2020 Elsevier Ltd. All rights reserved.
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