期刊
RSC ADVANCES
卷 10, 期 27, 页码 15901-15912出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra01177k
关键词
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资金
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07202002]
- National Natural Science Foundation of China (NSFC) [51578519]
- Fundamental Research Funds for the Central Universities [2652017189]
Pyrite (FeS2) catalyzed conversion of H2O2 into oxidants is increasingly recognized as a promising Fenton-like process for treating recalcitrant contaminants. However, the underlying mechanism remains unclear, especially for nano-pyrite. The present study explored the potential of a nano-pyrite Fenton system for p-nitrophenol oxidation using high energy ball milled nano-pyrite. The enhancement in & x2d9;OH production, with 3 times faster p-nitrophenol degradation than the conventional Fenton system, is ascribed to the reduction of pyrite size to the nanoscale, which alters the Fe2+ regeneration pathway, favoring faster and very efficient production of & x2d9;OH during H2O2 decomposition. The amount of H2O2 required was reduced due to the increased conversion efficiency of H2O2 to & x2d9;OH from 13.90% (conventional Fenton) to 67.55%, in which surface S-2(2-) species served as an electron source. An interpretation of the degradation intermediates and mineralization pathway of p-nitrophenol was then made using gas chromatography-mass spectrometry. This study bridges the knowledge gap between p-nitrophenol removal and the nano-pyrite catalyzed oxidant generation process.
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