Abstract
Based on the fact that the photo-Fenton process can directly use solar energy to degrade various pollutants, it has received widespread attention. However, it has attracted widespread attention due to the rapid recombination of photo-generated carriers and the low light response range. Therefore, the construction of a Z-scheme heterojunction in this paper can effectively enhance the electron-hole separation, increase the reduction and oxidation potential, and enhance the redox capability of the photocatalysis. This paper reports the successful preparation of visible-light-induced ZnFe2O4/BiOI composite photocatalysis. There is a Z-scheme heterojunction structure of ZnFe2O4 and BiOI. At the same time, the PL and UV absorption spectra showed that the light absorption performance of the composite nanomaterials was enhanced, the photo-generated carrier recombination rate was reduced, and the photo-Fenton performance was also significantly improved. And the photocurrent of ZnFe2O4/BiOI is more than 27 times that of pure ZnFe2O4. In addition, ZnFe2O4/BiOI can degrade the simulated pollutant RhB 100% within 20min under simulated sunlight. It shows that ZnFe2O4/BiOI binary composite has excellent photo-Fenton properties. In addition, ZnFe2O4/BiOI still maintains a high photo-Fenton ability after three cycles. Therefore, it has potential application prospects of the industrial photodegradation of organic pollutants.
Highlights
In recent decades, with the rapid development of global industrialization and the large-scale application of organic dyes, the shortage of freshwater resources and water pollution have become a global problem facing human society
The researchers have combined the advantages of ironbased oxide photocatalysis technology and Fenton oxidation technology to realize the cycle of the photoFenton process, which makes the system produce more ·OH with solid oxidizing ability, thereby enhancing the degradation of pollutants in wastewater effectiveness.(Clarizia et al 2017, Mirzaei et al 2017, Xing et al 2018) Photo-Fenton technology has unique advantages such as low preparation cost, fast degradation rate and less secondary pollution
The tetrahedral gap is surrounded by four oxygen ions; the B position means the octahedral position occupied by the trivalent metal ion octahedral void is surrounded by six oxygen ions.(Behera et al 2019, Jiang et al 2018, Zhou et al 2020a) Spinel structure ZnFe2O4 has the characteristics of non-toxic, stable chemical properties, photochemical corrosion resistance, simple preparation and low cost.(Cai et al 2016, Chen et al 2021, Xiang et al 2020) Compared with traditional photocatalysts, ZnFe2O4 has a narrower bandgap, is more sensitive to visible light, has a broader spectral response range, and has good photocatalytic activity. (Chen et al 2010, Zheng et al 2020)
Summary
With the rapid development of global industrialization and the large-scale application of organic dyes, the shortage of freshwater resources and water pollution have become a global problem facing human society. The researchers have combined the advantages of ironbased oxide photocatalysis technology and Fenton oxidation technology to realize the cycle of the photoFenton process, which makes the system produce more ·OH with solid oxidizing ability, thereby enhancing the degradation of pollutants in wastewater effectiveness.(Clarizia et al 2017, Mirzaei et al 2017, Xing et al 2018) Photo-Fenton technology has unique advantages such as low preparation cost, fast degradation rate and less secondary pollution It has shown broad application prospects of the use of solar energy to degrade pollutants.(Huang et al 2017, Liu et al 2017, Zhang et al 2019). After three cycles of reaction, the degradation rate of RhB remained at 81.6%
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