Catalytic oxidation effect of MnSO 4 on As(III) by air in alkaline solution

The catalytic oxidation effect of MnSO on As(III) by air in an alkaline solution was investigated. According to the X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product, it was shown...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2023-04, Vol.126, p.644
Main Authors: Li, Yuhu, Yang, Yudong, Wang, Ruixiang, Xu, Zhifeng, Jin, Guizhong, Jin, Chengyong
Format: Article
Language:English
Subjects:
Alkalies
Arsenic
Catalysis
Oxidation-Reduction
Photoelectron Spectroscopy
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Summary:The catalytic oxidation effect of MnSO on As(III) by air in an alkaline solution was investigated. According to the X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product, it was shown that the introduction of MnSO in the form of solution would generate Na Mn O ·1.5H O with strong catalytic oxidation ability in the aerobic alkaline solution, whereas the catalytic effect of the other product MnOOH is not satisfactory. Under the optimal reaction conditions of temperature 90°C, As/Mn molar ratio 12.74:1, air flow rate 1.0 L/min, and stirring speed 300 r/min, As(III) can be completely oxidized after 2 hr reaction. The excellent catalytic oxidation ability of MnSO on As(III) was mainly attributed to the indirect oxidation of As(III) by the product Na Mn O ·1.5H O. This study shows a convenient and efficient process for the oxidation of As(III) in alkali solutions, which has potential application value for the pre-oxidation of arsenic-containing solution or the detoxification of As(III).
ISSN:1001-0742
DOI:10.1016/j.jes.2022.05.042