Utilization of stable and efficient perovskite La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2) O3-δ catalyst with high-entropy to boost peroxymonosulfate activation towards organics degradation

Background: A new heterogeneous metal catalyst with greater catalytic activity and stability for peroxymonosulfate (PMS) activation is desirable to be explored. Recently, ABO(3)-type perovskites have attracted much attention in PMS activation, but there is still much space for improvement as its easy tailoring of composition and structure. Lately, a high-entropy perovskite showed an excellent redox and stability, being a promising material in the field of electrochemistry. Method & result: Herein, a high-entropy perovskite La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3-delta, termed LCMFCN, was synthesized and first applied to activate PMS for organics degradation. In the presence of 0.05 g center dot L-1 LCMFCN and 1 mmol center dot L-1 PMS, 99.1 +/- 0.6% of Rhodamine B (RhB, 10 mg center dot L-1) was degraded within 60 min, which outperformed most perovskites with a single cation at the B-site (e.g., LaNiO3). The LCMFCN also exhibited excellent stability, with RhB degradation efficiency of similar to 96% after five consecutive cycles. O-1(2) was suggested to play a vital role in RhB degradation in the PMS/LCMFCN system and two pathways of O-1(2) generation were proposed: (i) O-1(2) could evolve from the lattice oxygen, and (ii) O-1(2) converted from O-2(center dot-). Indicate: The results of this study suggest that the high-entropy perovskite can efficiently activate PMS for organics degradation, expanding the design range of perovskites application in water treatment.

Automated summary

A high-entropy perovskite, LCMFCN, was synthesized and successfully applied for PMS activation to degrade organic substances. With the presence of LCMFCN and PMS, 99.1% of Rhodamine B (RhB) at a concentration of 10 mg/L was degraded within 60 minutes, outperforming other perovskite catalysts. LCMFCN also demonstrated excellent stability with a degradation efficiency of around 96% after five consecutive cycles. This study expands the potential applications of perovskite materials in water treatment.