期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 374, 期 -, 页码 319-328出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.04.058
关键词
Magnesium peroxide nanoparticle; Fenton-like reaction; Organic contaminant; Hydroxyl radical
资金
- National Science Foundation for Distinguished Young Scholars of China [51725504]
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences [2015HSC-UE004]
In typical Fenton/Fenton-like reactions, H2O2 was usually used as an oxidant to degrade organic contaminants. However, liquid H2O2 is unstable, easy to decompose and has high biological toxicity especially at high concentration. Herein, highly pure magnesium peroxide (MgO2) nanoparticles were first synthesized and used instead of H2O2 to degrade organic dyes. The structure and morphology of as-prepared products were confirmed by XRD, SEM, TEM and FTIR techniques. The active oxygen content of MgO2 nanoparticles reached up to 26.93 wt%, suggesting a high purity of the as-prepared sample. The degradation performance of MgO, nanoparticles towards organic contaminants was systematically investigated in the terms of the molar ratio of Fe3+ to MgO2, the dosage of MgO2, initial solution pH and different organic dyes. The results indicated the as-prepared MgO2 exhibited excellent degradation ability to various types of organic dyes. 10 mg of MgO, nanoparticles could almost completely degrade 200 mL of 20 mg/L methylene blue (MB) in 30 min with a TOC removal rate of 70.2%. The efficient degradation performance was ascribed to the generation of hydroxyl radicals in the MgO2/Fe3+ system. The pathways of MB degradation were also proposed based on the determination of the reaction intermediates.
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