Abstract
This study illustrates the directed self-assembly of mesoporous TiO2 with magnetic properties due to its colloidal crystal structure with Fe3O4. The Fe3O4 nanoparticles were synthesized using co-precipitation techniques to a size of 28.2 nm and a magnetic saturation of 66.9 emu g(-1). Meanwhile, mesoporous titania nanoparticles (MTNs) with a particle diameter of 373 nm, a specific surface area of 236.3 m(2) g(-1), and a pore size of 2.8 nm were prepared by controlling the rate of hydrolysis. Magnetic colloidal crystals (a diameter of 10.2 μm) were formed by the aggregation of Fe3O4 and MTNs caused by the interface phenomena during solvent evaporation in emulsion. Even the anatase octahedrite produced from the colloidal crystal after a hydrothermal reaction retained a magnetic saturation of 2.8 emu g(-1). This study also investigates the photodegradation activity of our synthesized material as a photocatalyst, while utilizing its capability for magnetic separation to prove its usefulness in catalyst recycling.
Highlights
Filtration generally requires a vacuum source or high pressure to facilitate the process, which results in the additional cost and energy usage associated with filtration
In addition to the structural and physical analysis of the M-mesoporous titania nanoparticles (MTNs), this study will investigate the activity of the M-MTNs as photocatalysts by measuring their organic degradation, while utilizing their capability for magnetic separation to prove their usefulness in catalyst recycling
The general information on the photocatalyst ability to photodegrade Orange II is summarized in Fig. 6, where C is the concentration of Orange II, C* is the starting concentration of Orange II, C0 is the starting concentration of Orange II prior to UV radiation, and t is the duration of UV radiation
Summary
Filtration generally requires a vacuum source or high pressure to facilitate the process, which results in the additional cost and energy usage associated with filtration. It is necessary to frequently replace the filter to prevent particle accumulation and maintain minimal filtration efficiency.[5] Due to these difficulties presented by centrifugation and filtration methods, magnetic separation is the ideal technique for solid catalyst recycling. Fe3O4 is introduced into the colloidal crystal to result in the magnetized microparticle during the directed self-assembly of MTNs into the colloidal crystal structure. In addition to the structural and physical analysis of the M-MTNs, this study will investigate the activity of the M-MTNs as photocatalysts by measuring their organic degradation, while utilizing their capability for magnetic separation to prove their usefulness in catalyst recycling
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