A new effective way to degrade methylene blue by introducing negative ions powder into Fe3O4/H2O2 system to accelerate Fe(III)/Fe(II) transformation.

Xiangfen Zhang,Hongzhou Chen,Zunye Ke,Feng Xue,Hanxin Wu,Enyong Ding,Jiafei Yang

doi:10.2166/wst.2021.097

Xiangfen Zhang, Hongzhou Chen + Show 5 more

Open Access

https://doi.org/10.2166/wst.2021.097

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Abstract

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 Fe3O4/H2O2 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-1, which is about 16 times higher than in Fe3O4/H2O2 Fenton-like system (0.035 h-1). In addition, the results of quenching experiments indicate that the electron (e-) and negative oxygen ion (•O2-) are the main reactive species. It was determined that Fe3O4@NIP is the effective component that leads to the activation of H2O2 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.

Highlights

To date, dyes are widely used in textile, leather, paper, rubber, plastics, cosmetics, pharmaceutical and food industries and approximately 15% of the world’s total production of dyes is lost during the dyeing process and released with the textile effluents (Wang et al a)
A wellresolved band at 605 cmÀ1 originated from the Al–O stretching vibration, and was shifted to 612 cmÀ1 with a blue-shift of 7 cmÀ1 for the Fe3O4@Negative ions powders (NIP) composite compared with that of the pure NIP
This result implied that NIP could chemically interact with Fe3O4 via Al–O–Fe bonds

Summary

Introduction

Dyes are widely used in textile, leather, paper, rubber, plastics, cosmetics, pharmaceutical and food industries and approximately 15% of the world’s total production of dyes is lost during the dyeing process and released with the textile effluents (Wang et al a). Zhang et al | Introduceing negative ions powder into Fe3O4/H2O2 system

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