Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 92, Issue -, Pages 69-78Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2020.02.006
Keywords
Fe3O4@polydopamine nanocomposites; Fenton-like catalysts; Fe3+/Fe2+ cycle; Magnetically reusable
Categories
Funding
- National Natural Science Foundation of China [51373137]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ2002]
- International Cooperation Project of Shaanxi Province [2016KW-053]
- Fundamental Research Funds for the Central Universities [3102018zy047]
- Graduate Starting Seed Fund of Northwestern Polytechnical University [ZZ2018195]
- Shanghai space science and technology innovation fund
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Advanced oxidation processes are widely applied to removal of persistent toxic substances from wastewater by hydroxyl radicals (OH), which is generated from hydrogen peroxide (H2O2) decomposition. However, their practical applications have been hampered by many strict conditions, such as iron sludge, rigid pH condition, large doses of hydrogen peroxide and Fe2+, etc. Herein, a magnetically recyclable Fe3O4@polydopamine (Fe3O4@PDA) coreshell nanocomposite was fabricated. As an excellent reducing agent, it can convert Fe3+ to Fe2+. Combined with the coordination of polydopamine and ferric ions, the production of iron sludge is inhibited. The minimum concentration of hydrogen peroxide (0.2 mmol/L and Fe2+ (0.18 mmol/L)) is 150-fold and 100-fold lower than that of previous reports, respectively. It also exhibits excellent degradation performance over a wide pH range from 3.0 to 9.0. Even after the tenth recycling, it still achieves over 99% degradation efficiency with the total organic carbon degradation rate of 80%, which is environmentally benign and has a large economic advantage. This discovery paves a way for extensive practical application of advanced oxidation processes, especially in environmental remediation. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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