A new effective way to degrade methylene blue by introducing negative ions powder into Fe 3 O 4 /H 2 O 2 system to accelerate Fe(III)/Fe(II) transformation

Negative ions powders (NIP) have been widely applied in many fields because of their natural electric field and far infrared radiation, especially in wastewater treatment. In this study, the NIP was first introduced into Fe O /H O system to degrade methylene blue (MB). The MB removal was completely...

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Bibliographic Details
Published inWater science and technology Vol. 83; no. 8; p. 1834
Main Authors Zhang, Xiangfen, Wu, Hanxin, Ke, Zunye, Yang, Jiafei, Chen, Hongzhou, Xue, Feng, Ding, Enyong
Format Journal Article
LanguageEnglish
Published England 01.04.2021
Subjects
Ferric Compounds
Ferrous Compounds
Hydrogen Peroxide
Methylene Blue
Oxidation-Reduction
Powders
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Summary:Negative ions powders (NIP) have been widely applied in many fields because of their natural electric field and far infrared radiation, especially in wastewater treatment. In this study, the NIP was first introduced into Fe O /H O system to degrade methylene blue (MB). The MB removal was completely achieved at 5 h via a non-photochemical pathway and the degradation rate constant of this system is about 0.565 h , which is about 16 times higher than in Fe O /H O Fenton-like system (0.035 h ). In addition, the results of quenching experiments indicate that the electron (e ) and negative oxygen ion (•O ) are the main reactive species. It was determined that Fe O @NIP is the effective component that leads to the activation of H O to produce •OH, which derive from the pathway: NIP acts as an electron donor to reduce Fe(III) into Fe(II). Moreover, NIP can produce negative ions, which is also conductive to degradation. This study suggests a promising direction for the practical application of NIP based catalysis by integrating it with the Fe(III)/Fe(II) transformation process.
ISSN:0273-1223