Core-shell Fe3O4@MIL-101(Fe) composites as heterogeneous catalysts of persulfate activation for the removal of Acid Orange 7.
In this study, a novel core-shell Fe3O4@MIL-101 (MIL stands for Materials of Institute Lavoisier) composite was successfully synthesized by hydrothermal method and was fully characterized by X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectra, and X-ray photoelectron spectroscopy. The composite was introduced as a catalyst to generate powerful radicals from persulfate for the removal of Acid Orange 7 in an aqueous solution. Effects of the central metal ions of MIL-101, amino group content of MIL-101, and pH were evaluated in batch experiments. It was found that both hydroxyl and sulfate radicals were generated; importantly, sulfate radicals were speculated to serve as the dominant active species in the catalytic oxidation of Acid Orange 7. In addition, a possible mechanism was proposed. This study provides new physical insights for the rational design of advanced metal-organic frameworks (MOF)-based catalysts for improved environmental remediation.
School of Resources and Environment, University of Jinan, Jinan, 250022, China.
Xinxin
X
Yue
School of Resources and Environment, University of Jinan, Jinan, 250022, China. chm_guowl@ujn.edu.cn.
Weilin
W
Guo
School of Resources and Environment, University of Jinan, Jinan, 250022, China.
Xianghui
X
Li
School of Resources and Environment, University of Jinan, Jinan, 250022, China.
Haihong
H
Zhou
School of Resources and Environment, University of Jinan, Jinan, 250022, China.
Ruiqin
R
Wang
D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D000073396:Metal-Organic Frameworks; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D056831:Coordination Complexes; D058085:Iron Compounds; D000073396:Metal-Organic Frameworks; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000589635:MIL-101; C014722:2-naphthol orange
Acid Orange 7; Advanced oxidation processes; Fe3O4; Metal-organic frameworks; Sulfate radicals