Heterogeneous Fenton-Like Catalytic Degradation of 2,4-Dichlorophenoxyacetic Acid by Nano-Scale Zero-Valent Iron Assembled on Magnetite Nanoparticles

被引:19
|
作者
Lv, Xiaofan [1 ]
Ma, Yiyang [2 ]
Li, Yangyang [3 ]
Yang, Qi [1 ]
机构
[1] China Univ Geosci Beijing, Beijing Key Lab Water Resources & Environm Engn, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm Engn & Nanotechnol, Shenzhen 518055, Peoples R China
[3] Beijing Que Chen Architectural Design Consulting, Beijing 100038, Peoples R China
关键词
2; 4-dichlorophenoxyacetic acid; nano-scale zero-valent iron; magnetite; heterogeneous Fenton-like system; hydroxyl radicals; ORGANIC-COMPOUNDS; REACTION-KINETICS; WASTE-WATER; OXIDATION; 2,4-D; DECHLORINATION; DECOMPOSITION; IONS;
D O I
10.3390/w12102909
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:1 / 19
页数:19
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