Abstract
In this study, uniform Fe3O4 magnetic nanorings (Fe3O4-MNRs) were prepared through a simple hydrothermal method. The morphology, magnetic properties, and structure of the product were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. The Fe3O4-MNRs were used as Fenton-like catalysts in the presence of hydrogen peroxide (H2O2) and showed excellent Fenton-catalytic activity for degradation of organic dyes such as Methylene blue (MB), Rhodamine B (RhB), and Bromophenol blue (BPB). Furthermore, the obtained Fe3O4-MNRs could be recycled after used for several times and still remained in a relative high activity and could rapidly be separated from the reaction medium using a magnet without considerable loss. All results reveal that Fe3O4-MNRs have potential for the treatment of dyes pollutants.
Highlights
With the advancement of technology and society, dyes are extensively used in textiles, plastics, leather, pharmaceuticals, food, cosmetics, dyestuffs, tanning, and printing industries [1,2]
(Figure 1a,b) and scanning electron microscope (SEM) (Figure 1c,d). It showed that the Fe3 O4 -MRs presented homogeneous shape (Figure 1a,b) and SEM (Figure 1c,d)
The results indicated that the Fe3 O4 -MNRs could generate OH effectively, which was ascribed to the Fenton-like effect between the iron ions and H2 O2
Summary
With the advancement of technology and society, dyes are extensively used in textiles, plastics, leather, pharmaceuticals, food, cosmetics, dyestuffs, tanning, and printing industries [1,2]. A great many physical and chemical methods have been exploited to remove/degrade those dyes from wastewater, such as physical adsorption, precipitation coagulation, flocculation, reverse osmosis, filtration, membrane separation, biological process, chemical oxidation, and catalytic degradation [4,5,6,7,8,9]. Some chemical and physical methods such as adsorption and coagulation only transfer pollutants and require more processing. It has been more appropriate to utilize the advanced oxidation processes (AOPs) for organic pollutant treatment, including photolysis, photocatalysis [10], Fenton process [11,12], ozonation [13,14], and sonolysis [15]. With the assistance of H2 O2 , the Fenton agents could generate hydroxyl radicals (OH)
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