Comparative Study on the Role of Noble Metal Nanoparticles (Pt and Pd) on the Photocatalytic Performance of the BaFe₁₂O₁₉/TiO₂ Magnetic Nanocomposite: Green Synthesis, Characterization, and Removal of Organic Dyes under Visible Light

Abstract

Adding noble metals and barium hexaferrite to TiO 2 creates novel magnetic plasmonic nanocomposites with high activity in the photodegradation of organic contaminants. In this work, we have synthesized BaFe 12 O 19 by microwave and sol−gel combustion (using green fuel, glucose) methods and TiO 2 by the sol−gel method. Then, noble metals (Pt and Pd) were deposited on BaFe 12 O 19 /TiO 2 by a reducing agent (glucose: green surfactant) under ultrasound waves. The samples were characterized. On the basis of XRD and SEM results, the composites are highly crystalline and impurity-free. TEM images and BET analysis indicated the samples have a suitable morphology. Furthermore, the magnetic analysis showed the addition of TiO 2 and noble metals to barium hexaferrite has led to the lower coercivity, but the synthesized nanocomposites still have the suitable magnetic properties (M sBaFe12O19/TiO2@Pt = 37, M sBaFe12O19/TiO2/Pd = 34, M rBaFe12O19/TiO2@Pt = 16, M rBaFe12O19/TiO2/Pd = 13.9 emu/g). UV−vis DRS spectra revealed the band gaps of BaFe 12 O 19 /TiO 2 @Pt and BaFe 12 O 19 /TiO 2 /Pd are 3.13 and 3.08 eV, respectively. Finally, BaFe 12 O 19 /TiO 2 @Pt and BaFe 12 O 19 /TiO 2 /Pd nanocomposites were used to degrade the anionic and cationic dyes under visible irradiation within 120 min. The highest percentage of degradation was related to methyl orange, around 96% and 92% by BaFe 12 O 19 /TiO 2 @Pt and BaFe 12 O 19 /TiO 2 /Pd, respectively. Indeed, Pt because of its high work function and electron affinity is more effective in photodegradation.

Optimization of the structural, optical, and magnetic properties of sol-gel derived La3+ substituted nanostructured barium hexaferrites

“…As previously observed by Suthar et al, the substitution of La 3+ ions for Ba 2+ ions cause the introduction of Fe 2+ ions into the structure, which leads to a reduction in M s from 38.53 to 33.71 emu g −1 and an increase in coercivity (H c ) from 94.17 to 213.30 Oe [54]. Razavi et al [55] recently found a decrease in the saturation magnetization (M s ). According to Anjum et al, saturation magnetization reduced as Sr +2 ion content increased, and this reduction was caused by the various sites that Sr +2 and Fe +3 ions occupied [26].…”

Preparation, Characterization and Photocatalytic Degradation Studies of an Acrylic Acid-acryl Amide based TiO2 Hydrogel Nanocomposite: Real Samples of Pollutants Dyes

“…The excess of dye prevents the penetration of light through the successive layers of dye onto (AAc-g-AM)/TiO 2 hydrogel surface is weak to generate the required excited state of the dye on (AAc-g-AM)/TiO 2 hydrogel. 17 The dye concentration 40 mg/L gives the best Photocatalytic degradation capacity (77.49%). [18][19][20][21] The data of the change in (PDE%)with GR dye appear in Figure 5.…”

Methacrylic Acid-Acrylamide based ZnO Hydrogel Nanocomposite Assisted Photocatalytic Decolorization of Methylene Blue Dye

“…of MB dye 80 mg/L gave better photocatalytic efficiency (87.88%). 27,30,31 The result of the change in (PDE%) with MB appears in Figure 7.…”