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Environ Sci Pollut Res Int. 2019 May;26(13):12963-12974. doi: 10.1007/s11356-019-04749-3. Epub 2019 Mar 20.

Sulfate radical-mediated degradation of phenol and methylene blue by manganese oxide octahedral molecular sieve (OMS-2) activation of peroxymonosulfate.

Wei J1,2, Li X3,4, Yang Q5,6, Wu Y1,2, Huang X1,2, Tao Z1,2, Xu Q1,2, Zhu X1,2, Wang D1,2.

Author information

1
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
2
Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, People's Republic of China.
3
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. xmli@hnu.edu.cn.
4
Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, People's Republic of China. xmli@hnu.edu.cn.
5
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. yangqi@hnu.edu.cn.
6
Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, People's Republic of China. yangqi@hnu.edu.cn.

Abstract

Activation of peroxymonosulfate (PMS) has been concentrated on degrading refractory organic pollutants owing to the generation of sulfate radical ([Formula: see text]) with high standard redox potential. In this study, manganese oxide octahedral molecular sieve (OMS-2) with cryptomelane type was synthesized by a new hydrothermal method to activate PMS for the degradation of phenol and methylene blue (MB) in water. The as-prepared composites were fully characterized, and the effects of PMS dosage, OMS-2 dosage, initial pollutant concentration, pH, and chloride on the degradation of phenol were elaborately investigated. Moreover, the phenol degradation was evaluated through the variations of total organic carbon (TOC) and three-dimensional excitation emission matrix (3D-EEM), and reaction intermediates were also investigated. Both electron spin resonance (ESR) spectra and comparative experiments suggested [Formula: see text] and hydroxyl radical (HO) took part in the phenol degradation and [Formula: see text] was more significant than HO. The fine degradation efficiency of phenol in different water source, as well as the stability after continuous use, indicated the possible application of PMS/OMS-2 in real wastewater treatment.

KEYWORDS:

Degradation; Manganese oxide octahedral molecular sieve; Methylene blue; Peroxymonosulfate; Phenol; Sulfate radical

PMID:
30895542
DOI:
10.1007/s11356-019-04749-3

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