Facile green synthesis of magnetically separable Au–Pt@TiO2 nanocomposite for efficient catalytic reduction of organic pollutants and selective oxidation of glycerol

Green approaches for the synthesis of metal and metal oxide nanoparticles using microbial and plant extracts

“…Hence, immobilization of the metal NPs on the surface of titanium dioxide (TiO 2 ), silica (SiO 2 ), manganese dioxide (MnO 2 ), and carbon support materials was carried out and reported in recent studies to attain high activity and recovery. 45 Another recent study combined the advantages of MnO 2 as an active catalyst and the excellent dispersibility of GO as the support for the immobilization of metal NPs. The Cu–GO–MnO 2 nanocomposite was identified to be a reusable heterogeneous catalyst with high catalytic activity for the degradation of toxic organic dyes and nitro compounds at room temperature.…”

“…The biosynthesized Fe 3 O 4 NPs were immobilized on the surface of the TiO 2 support material as a potential catalyst for glycerol biomass conversion and organic dye pollutant degradation. 45 Glycerol is the byproduct of fatty acid and biodiesel production, where glycerol can be converted into various value-added chemicals and intermediate compounds, such as glyceric acid, glycolic acid, tartronic acid, glyceraldehyde, dihydroxyacetone, lactic acid and oxalic acid via the glycerol oxidation reaction. 45 On the other hand, 4-nitrophenol and organic dyes, such as methylene blue, methyl orange and Congo red, are popular toxic pollutants, which can be reduced using Fe 3 O 4 –TiO 2 –Au–Pt nanocomposite and are also useful for commercial applications, including corrosion inhibition, antipyretic drugs and photographic developers.…”

“…45 Glycerol is the byproduct of fatty acid and biodiesel production, where glycerol can be converted into various value-added chemicals and intermediate compounds, such as glyceric acid, glycolic acid, tartronic acid, glyceraldehyde, dihydroxyacetone, lactic acid and oxalic acid via the glycerol oxidation reaction. 45 On the other hand, 4-nitrophenol and organic dyes, such as methylene blue, methyl orange and Congo red, are popular toxic pollutants, which can be reduced using Fe 3 O 4 –TiO 2 –Au–Pt nanocomposite and are also useful for commercial applications, including corrosion inhibition, antipyretic drugs and photographic developers. 45 Furthermore, it was reported that the Fe 3 O 4 –TiO 2 –Au–Pt nanocomposite maintained 98% of catalytic activity in the reduction of organic compounds even after six cycles, which confirmed the stability and efficiency of the resulting nanocomposites for toxic organic dye degradation.…”

“…45 On the other hand, 4-nitrophenol and organic dyes, such as methylene blue, methyl orange and Congo red, are popular toxic pollutants, which can be reduced using Fe 3 O 4 –TiO 2 –Au–Pt nanocomposite and are also useful for commercial applications, including corrosion inhibition, antipyretic drugs and photographic developers. 45 Furthermore, it was reported that the Fe 3 O 4 –TiO 2 –Au–Pt nanocomposite maintained 98% of catalytic activity in the reduction of organic compounds even after six cycles, which confirmed the stability and efficiency of the resulting nanocomposites for toxic organic dye degradation. 45…”

Magnetite-Silica Core/Shell Nanostructures: From Surface Functionalization towards Biomedical Applications—A Review

“…Magnetite nanoparticles are also widely used in environmental applications because they can easily be removed from the environment. These magnetite nanomaterials are used as absorbents, and also as photocatalysts to degrade various agents, including organic pollutants, antibiotics, and pesticides [27][28][29][30][31]. To avoid agglomeration and improve the stabilization of magnetite nanoparticles in the target tissue, they are generally covered with a coating shell [4,32].…”