Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

Abstract

In this research, initially after preparing γ-alumina and Fe(III) doped γ-alumina prepared by the sol-gel method, the initial calcination of the sols was carried out for 3 h at 300 o C and the obtained pulverized solid crystals were added into two sol-gel containers consisting of titanium tetra iso-propoxide (TTiP) and Fe(III) doped TTiP . After homogenization, the new sol was for 24 h and calcinated for 4 h at 600 o C. After the process of washing and purification, the core-shells were prepared and characterized. The photocatalytic properties were compared to those of the pure TiO 2 , which had been prepared by the sol-gel method. Some of the properties of these new synthesized particles include increased effective surface area of TiO 2 intake feed, increased activity of photocatalytic properties in terms of the alkaline pH, and enhanced strength of the core shell particles in the process of mechanical separation during the reactivation steps up to 10 times of recovery. Photocatalytic activity was examined by degradation of methylen blue. Doping Fe (III) in the core of γ-alumina, increased the mechanical stability while doping Fe (III) in the TiO 2 shell decreased the time of degradation and increased the stability of the catalyst in an alkaline solution to a pH of about 12.

Reconstructing 1D Fe Single‐atom Catalytic Structure on 2D Graphene Film for High‐Efficiency Oxygen Reduction Reaction

“…In addition, the peak at 1378 cm −1 in the FTIR spectrum of α‐FePc could be attributed to the stretching vibration of Fe−O bond, which is formed due to the natural oxygen affinity of active Fe 2+ ions [17] . The Fe−O peak vanished while two extra peaks at 665 cm −1 and 962 cm −1 (stretching and bending vibrations of Fe−O−Fe bonds, respectively) occurred, suggesting changed Fe−O coordination configuration in Fe SAC@G‐110 [18] . Moreover, the Raman spectrum (Figure 2b) of Fe SAC@G‐110 also exhibits decreased intensity of the C−H vibration peaks at 1096 cm −1 and 1200 cm −1 compared with that of α‐FePc, which indicates the removal of H atoms [19] in agreement with the FTIR results.…”

Ambient Synthesis of Single‐Atom Catalysts from Bulk Metal via Trapping of Atoms by Surface Dangling Bonds

“…As for the R‐space of XANES, the Fe SAs/GO shows a main peak around 1.51 Å (Figure f), which belongs to the FeO bond. The abundant FeO bonds can also be confirmed by FTIR analysis, in which the peak at 530 and 1450 cm −1 can be attributed to the stretching vibration of the FeO and OFeO bond, respectively (Figure S5, Supporting Information) . As a control, the R‐space spectrum of Fe foil shows a prominent peak of Fe–Fe coordination at 2.25 Å.…”

Synthesis and characterization of [BaO-(10-x)ZrO2-TiO2-SiO2-xCrO3] type glass and glass ceramics

“…The bands at low frequencies side were observed in wave number range of 415-480 cm −1 that can be assigned to vibration of Ba 2+ metal cation and bending vibration of Si-O-Si for the CrO 3 free glass sample BZTS0C while this band is slightly shifted at 417 cm −1 [57]. The second transmittance bands lie in the wavenumber range of 1413-1443 cm −1 which may be assigned due to metal oxide vibrations of Ti-O [58]. Moreover, these stretching vibration of BaCO 3 indicate that it could not decompose fully into BaO+CO 2 because it trapped into the glassy matrix of the composition.…”