Persulfate activation by magnetic γ-Fe2O3/Mn3O4 nanocomposites for degradation of organic pollutants

被引：133

作者：

Ma, Qiuling ^{[1
]}

Zhang, Xinyi ^{[1
]}

Guo, Ruonan ^{[1
]}

Zhang, Huixuan ^{[1
]}

Cheng, Qingfeng ^{[2
]}

Xie, Mingzheng ^{[1
]}

Cheng, Xiuwen ^{[1
,2
]}

机构：

[1] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Gansu, Peoples R China

[2] Chengdu Univ Informat Technol, Coll Resources & Environm, Chengdu 610225, Sichuan, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2019年 / 210卷

基金：

中国国家自然科学基金;

关键词：

gamma-Fe2O3/Mn3O4; Magnetic; Persulfate; Degradation; Sulfate radicals; ADVANCED OXIDATION PROCESSES; WASTE-WATER TREATMENT; HETEROGENEOUS CATALYST; SULFATE RADICALS; RHODAMINE-B; PEROXYMONOSULFATE; IRON; EFFICIENCY; STABILITY; CHEMISTRY;

D O I：

10.1016/j.seppur.2018.06.060

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this work, magnetic gamma-Fe2O3/Mn3O4 nanocomposites with various mass ratios were successfully fabricated using a facile two-step method. Then these composites were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), X-ray photoelectron spectra (XPS) and vibrating sample magnetometer (VSM) measurements. Besides, the samples were applied to activate per sulfate for Rh B degradation. Results showed that the sample with a gamma-Fe2O3/Mn3O4 mass ratio of 3:1 exhibited higher activity than other gamma-Fe2O3/Mn3O4 nanocomposites, pure gamma-Fe2O3 and pure Mn3O4, where 95.1% of Rh B could be decomposed within 150 min in the presence of persulfate. In addition, effects of operational parameters on the catalytic activity of Rh B were also evaluated, which included persulfate concentration, catalyst dosage, reaction temperature and initial pH value. More importantly, the as-fabricated gamma-Fe2O3/Mn3O4 nanocomposites revealed magnetism and could be separated conveniently through external magnetic, which was beneficial to recycle the catalysts from the aqueous solution. Finally, the mechanism of activating persulfate by gamma-Fe2O3/Mn3O4 nanocomposites was proposed based on the results and literatures, which might provide a reference for further study of heterogeneous catalysis.

引用

页码：335 / 342

页数：8

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