The Role of Metal-Doped into Magnetite Catalysts for the Photo-Fenton Degradation of Organic Pollutants

Abstract

Recently, the incorporation of transition metals into magnetite increasing the heterogeneous Fenton catalytic activity of magnetite with high efficiency and interesting magnetic properties applied for degradation of organic pollutants in water purification and wastewater treatment have attracted more and more researchers. In this review, using of one or some metal doped magnetite based systems in heterogeneous Fenton, or photo-Fenton processes are discussed. Then, the role of metal doped species for the enhanced efficiency of degradation process is presented. Finally, possible reaction mechanism for the photo-Fenton degradation pollutants in the present of metal doped magnetite is also given.

Hematite and Magnetite Nanostructures for Green and Sustainable Energy Harnessing and Environmental Pollution Control: A Review

“…Some important metal-doped hematite and magnetite catalysts include Sn and Be/H-NPs, , Ru/H-NPs, F and N/H-NPs, Gd/M-NPs, Sr/M-NPs, Tb/M-NPs, S/M-NPs, etc. The doped H-NPs are found useful in photoelectrochemical and photocatalytic applications, while the rest were effectively employed in environmental detection and decontamination applications . Besides doping, physical and chemical mixing of pristine H-NPs and M-NPs with appropriate materials could enhance their overall physicochemical and optoelectrical characteristics, and many researchers are investigating various combinations.…”

“…The doped H-NPs are found useful in photoelectrochemical and photocatalytic applications, while the rest were effectively employed in environmental detection and decontamination applications. 164 Besides doping, physical and chemical mixing of pristine H-NPs and M-NPs with appropriate materials could enhance their overall physicochemical and optoelectrical characteristics, and many researchers are investigating various combinations. Proper mixing will lead to heterostructure and nanocomposite formation; some examples can be found in sections 3.1 and 3.2.…”

Fabrication, functionalization and performance of doped photocatalysts for dye degradation and mineralization: a review

“…Therefore, continuous research and material science and engineering efforts are deployed to formulate such materials which can unleash much acceptable and superior photocatalytic degradation performances by encompassing more and more of the dyes contained within a specific multi-dye system. Moreover, synthetic modifications occur in the form of doping the parent catalyst with specific heteroatoms (Yao et al 2016;Pham and Yeom 2016;Di et al 2017;Zeng et al 2017;Cao et al 2017;Nguyen and Ngo 2018;Qian et al 2018), in combining the catalyst with other compounds to generate composites with enhanced and adjustable catalytic properties such as improved interfacial surface areas and more favourable band gaps (Tanwar et al 2017;Hossain et al 2018;Azzam et al 2019) and enhanced electronic movement (Hu et al 2015;Saleh et al 2016;Sankar et al 2016;Chai et al 2017;Bhanvase et al 2017;Qian et al 2018;Zeng et al 2018).…”

Photocatalytic Activity of Zero-Valent Iron Nanoparticles Highly Dispersed on Porous Carbon Materials

“…The first route is that the generated Fe 3+ interacts with internal zerovalent iron or other intermediate reducing agents such as HO 2 and R • to regenerate Fe 2+ (Liang et al, 2021). The second route is that iron oxides perform a typical semiconductor photocatalytic redox process to realize the regeneration of Fe 2+ (Nguyen et al, 2017). During the aforementioned photocatalytic reaction process, light not only promotes the regeneration cycle of Fe 2+ , but also plays a positive role in the production of reactive oxygen species, such as•OH, thereby improving the degradation efficiency of the Fenton reaction.…”

“…Both the XPS and XRD test results (Figures 6C,D) show that after five photocatalytic reaction cycles, the content of iron oxides, especially FeOOH (PDF#44-1415), increased significantly, while the photocatalytic efficiency did not decrease, which proved the aforementioned photocatalytic mechanism from the side. Previous studies have shown that light helps to dissociate•OOH from FeOOH formed during the Fenton reaction, resulting in improved degradation efficiency of the Fenton reaction (Nguyen et al, 2017).…”