Autocombustion‐Promoted Synthesis of Lanthanum Iron Oxide: Application as Heterogeneous Catalyst for Synthesis of Piperidines, Substituted Amines and Light‐Assisted Degradations

Abstract

An autocombustion technique was adopted to synthesize the Perovskite structured Lanthanum iron oxide nanoparticles (LaFeO3, abbreviated as LFO NPs). This technique offered lots of benefits such as short reaction time along with quick heating rate. LFO NPs were fabricated at different calcination temperatures (300‐800 °C) through the aid of sucrose as chelating agent. The prepared LFO NPs were well characterized by various techniques like X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), Vibrating sample magnetometer (VSM), Ultraviolet‐Visible spectroscopy (UV‐Vis), Brunauer–Emmett–Teller (BET), X‐ray Photo‐Electron Spectroscopy (XPS) and Transmission electron microscopy (TEM) which affirmed that highly crystalline LFO NPs were obtained at 700 °C. Subsequently, the catalytic activity of the LFO NPs was surveyed for three independent approaches: (i) for the synthesis of functionalized piperidines through activation of carbonyl groups in the reacting partners (ii) for the sunlight‐assisted mineralization of health hazardous food colorant, Allura Red AC (iii) for the hydrogenation of nitro aromatic compounds (NACs) using NaBH4 (sodium borohydride) as source of hydrogen in aqueous medium at room temperature.

Electroactive Core–Shell Chitosan-Coated Lanthanum Iron Oxide as a Food Freshness Level Indicator for Tyramine Content Determination

“…The peak located at 537 cm –1 is the characteristic absorption peak of Fe–O stretching vibrations occurring in the octahedral FeO 6 units. Additionally, the appeared minute peak at 476 cm –1 belongs to the Fe–O–Fe bending modes . As expected, the FT-IR spectra of x CS/LFO ( x = 100, 200, 300, 400, and 500) demonstrated the characteristic peaks of both CS and LFO, but with a slight change in the wavenumber as well as in intensity of peaks.…”

“…The preparation of magnetic-core (LFO NPs) was accomplished by adopting our previously reported procedure as described elsewhere . An autocombustion technique combined with the sonication has been adopted for the efficient synthesis of LFO NPs.…”

Synergistically enhanced solar light‐driven degradation of hazardous food colorants by ultrasonically derived MgFe2O4/S‐doped g‐C3N4 nanocomposite: A Z‐scheme system‐based heterojunction approach

“…This observation can be justified as follows: at acidic pH range, since pH < pH pzc , the surface of the catalyst acquires positive charge, hence favored the subsequent adsorption and degradation of Ery B, an anionic dye. [120] However, in case of IC, which is also an anionic dye, the trend followed was observed to be opposite. In this case, the basic pH medium favors the degradation process.…”

“…The slight reduction in photocatalytic performance of the nanocomposite might be attributed to the decrease in active catalytic sites or due to the blockage of the catalytic sites by the colorant's molecule. [120] Furthermore, the XRD analysis of recovered MFO: SCNNS (1:1) nanocomposite photocatalyst, after recycling from the degradation of both colorants, was also recorded and the obtained pattern is depicted in Figure ES20 (supporting information). It can be seen that the recycled catalyst exhibited the main diffraction peaks at same 2θ values as appeared in the fresh catalyst that is before its use in degradation.…”