期刊
WATER
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/w12102909
关键词
2; 4-dichlorophenoxyacetic acid; nano-scale zero-valent iron; magnetite; heterogeneous Fenton-like system; hydroxyl radicals
资金
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2015ZX07406005-001]
- Fundamental Research Funds for the Central Universities [2652018205]
Fe-0@Fe3O4 nanoparticles with dispersibility and stability better than single nano zero-valent iron (nZVI) were synthesized and combined with hydrogen peroxide to constitute a heterogeneous Fenton-like system, which was creatively applied in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The effects of different reaction conditions like pH, hydrogen peroxide concentration, temperature, and catalyst dosage on the removal of 2,4-D were evaluated. The target pollutant was completely removed in 90min; nearly 66% of them could be mineralized, and the main intermediate product was 2,4-dichlorophenol. Synergistic effects between nZVI and Fe3O4 made the 2,4-D degradation efficiency in the Fe-0@Fe3O4/H2O2 system greater than in either of them alone. More than a supporter, Fe3O4 could facilitate the degradation process by releasing ferrous and ferric ions from the inner structure. The reduction of 2,4-D was mainly attributed to hydroxyl radicals including surface-bound center dot OH and free center dot OH in solution and was dominated by the former. The possible mechanism of this Fe-0@Fe3O4 activated Fenton-like system was proposed.
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