Abstract
In this study, a ferrate material with a narrow band gap and rapid electron hole separation ability is synthesized for degrading methylene blue from industrial wastewater. Hard ferrite (CoZnFeO4) with octahedral structure is synthesized by solid-phase method from waste ferrous sulfate. The structure of the catalyst was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTPR) and scanning electron microscopy (SEM). TPR study showed that the oxidation performance of CoZnFeO4 is improved with the addition of cobalt. The total organic carbon removal rate of methylene blue over CoZnFeO4 catalyst is 90% within 60 min. The effects of reaction time, pollutant concentration, catalyst dosage and oxidant concentration on the removal efficiency were optimized. ESI–MS demonstrated the stability of the catalyst for leaching. X-ray diffractometry (XRD) and X-ray energy dispersive spectroscopy (XPS) showed that the catalyst could be reused. These findings provide a low cost and simple strategy for rational design and modulation of catalysts for the industrial degradation of organic pollutants. It not only realizes the use of waste to treat waste, but also accords with the current concept of green chemistry.
Highlights
At present, the global annual output of dyestuff exceeds 7 million tons, and –the dyestuff varieties of dyestuff have more than 100,000 kinds
In this work, CoZnFeO4 is synthesized by solid-phase method with titanium white waste residue as raw material, and the properties of the synthesized material are proved by X-ray diffraction (XRD), FTIR and Energydiapersive X-ray spectroscopy (EDS)
X-ray electron energy spectroscopy (XPS) tests show that cobalt is in the trivalent octahedral position of the spinel structure, which indicates that cobalt is substituted for iron in the synthesis
Summary
The global annual output of dyestuff exceeds 7 million tons, and –the dyestuff varieties of dyestuff have more than 100,000 kinds. Waste ferrous sulfate is an industrial by-product produced during the production of titanium dioxide by a sulphuric acid method. In 2018, the titanium dioxide industry produced more than 7 million tons of ferrous sulfate as a by-product [10]. The accumulation of waste ferrous sulfate causes a huge waste of sulfur and iron resources and causes serious environmental pollution. To reduce the synthesis cost, CoZnFeO4 nanoparticles are prepared with waste ferrous sulfate as an 73 iron source and pyrite as a reducing agent, which are used as photocatalyst for decolorizing MB. This study alleviates the pressure of environmental pollution and converts waste ferrous sulfate into resources, realizing waste control by waste
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