Ultrasound-assisted mineralization of organic contaminants using a recyclable LaFeO3 and Fe3+/persulfate Fenton-like system

Abstract

A recyclable heterogeneous catalyst has been successfully developed for application in a Fenton-type advanced oxidation process without adding external HO. LaFeO was prepared from Fe(NO)·9HO and La(NO)·6HO by a simple sol-gel method and its catalytic efficiency was evaluated for mineralization of 4-chlorophenol using a Fenton-like process. The mineralization process was carried out under ultrasonication in presence of heterogeneous LaFeO catalyst with HO that was produced during ultrasonication. The mineralization process was monitored through total organic carbon (TOC) analysis. Very importantly, utmost 5-fold synergism was evidenced by the ultrasound mediated LaFeO-catalyzed system. Besides, more than twofold synergism was observed by combining the ultrasound assisted LaFeO catalytic process and potassium persulfate (KPS) assisted advanced oxidation process. It is worth to mention that complete mineralization (∼96%) of 4-chlorophenol (initial concentration of 1.25×10M) was observed within 1h in the presence of LaFeO (0.5gL) and KPS (1.0mmol) under ultrasonication (40kHz). Even after four cycles, the activity of LaFeO remained intact which proved its recyclability. Extremely reusable heterogeneous LaFeO catalyst makes the system more interesting from both economic and environmental points of view.

Graphene‐supported LaFeO 3 for photocatalytic hydrogen energy production

“…Feng et al reported that LFO showed 88% degradation efficiency in the third cycle while Babu et al reported that 90% efficiency of LFO was conserved after the fourth cycle. 53,54 Consequently, this study shows that the incorporation of graphene provides an increase in the stability and efficiency of LFO.…”

Photo-Fenton like Catalyst System: Activated Carbon/CoFe2O4 Nanocomposite for Reactive Dye Removal from Textile Wastewater

“…According to Figure 4, the removal efficiency attained by CFO was the higher than that of UV irradiation and PS, which are mainly due to the high oxidation capacity. However, this finding indicates that the oxidation of dye by these processes is rather limited [30,40]. The highest removal efficiency of dye by AC, compared to that of oxidation processes, can be due to high specific surface area.…”

Ultrasound as an Advanced Oxidative Process: A Review on Treating Pharmaceutical Compounds

“…Similar sleep‐Fenton systems have been developed for the degradation of sodium cefazolin, paracetamol, 4‐chlorophenol, IBU, metronidazole, and levofloxacin by different researchers 50, 116–120. In all systems, there was a maximum degradation with the hybrid sleep‐Fenton process.…”