Photocatalytic degradation of phenol by LaFeO3 nanocrystalline synthesized by gel combustion method via citric acid route

Abstract

Focusing on the photocatalytic degradation of phenol under visible light, the synthesized lanthanum orthoferrites (LaFeO 3 ) by gel combustion method using citric acid as sacrificial agent were investigated. With the highest reaction temperature of 200 °C, the physicochemical properties of synthesized samples were characterized by X-Ray diffraction (XRD) analysis, Brunauer-Emmet-Teller (BET), and Energy Dispersive X-Ray spectroscopy (EDS). On the other hand, UV-Vis spectroscopy analysis was carried out to determine the phenol photodegradation activities and mechanism. The results suggested the well-defined LaFeO 3 nanocrystals with specific area of 28 m 2 g −1 were successfully synthesized. Besides that, variations in operating parameters such as pH, catalyst dosage and initial concentration of phenol in synthetic wastewater were also examined. In conclusion, LaFeO 3 nanocrystalline exhibited an exceptional photocatalytic activity for phenol degradation, thus providing a perfect alternative for pharmaceutical wastewater treatment.

Investigation of alkaline earth element substituted Lanthanum Ferrite nanoparticles and it’s characterization

“…According to a powder diffraction file (JCPDS card no. 37-1493), the samples showed a pure orthorhombic perovskite structure having strong and narrow phase peaks, as was previously described [25].…”

Synthesis, characterization, and performance assessment of a perovskite‐type nano photocatalyst for degradation of thiamethoxam

“…The mechanism of photocatalysis was studied by species trapping/scavenging experiment to determine the primary reactive species responsible in the photocatalytic degradation process. [ 47 ] 1 mmol of each isopropyl alcohol (IPA), ammonium oxalate (AO), and p ‐benzoquinone (BQ) were added to the reaction mixture and used as hydroxyl radical ( · OH), holes (h + ), and superoxide radical ( · O 2 − ) scavengers, respectively.…”

Perovskite Oxide Based Materials for Energy and Environment-Oriented Photocatalysis

“…In addition to BiFeO 3 , LaFeO 3 is also well studied for photocatalytic pollutant removal reactions. − The band gap of LaFeO 3 (about 2.1 eV) lies in the visible region and different nanostructures such as nanoparticles, ,,, nanospheres, , nanorods, nanotubes, and nanosheets have been prepared by researchers and used for the photocatalytic degradation of different organic pollutants (MB, RhB, methylphenol, and 4-chlorophenol (4-CP)). To further enhance the photocatalytic activity of LaFeO 3 , doping with other elements and coupling with other materials have also been reported. − ,− The other perovskites from this class, LnFeO 3 (Ln = Pr and Y) and SrFeO 3 are also reported for visible-light-assisted degradation of organic pollutants. − For example, Liang et al have synthesized the LaFeO 3 /g-C 3 N 4 p–n heterojunction photocatalyst by a solvothermal method using presynthesized components . The as-synthesized photocatalysts were used for the degradation of RhB under visible light irradiation and the optimized 20% LaFeO 3 /g-C 3 N 4 showed the maximum activity with good recyclability for four cycles (160 min), which was about 2.9 and 19.1 higher than the pristine g-C 3 N 4 and LaFeO 3 .…”