Co7Fe3/CoFe2O4@C Lamellar composites derived from Co-Fe LDH/PVA as an effective heterogeneous activator of peroxymonosulfate

Here we present a simple method to prepare a highly efficient three components nanocomposites via thermal degradation of layered double metal hydroxides (LDHs)@polyvinyl alcohol (PVA) composites. Co7Fe3/CoFe2O4@C obtained from this method is applied to activate peroxymonosulfate (PMS) to degrade polluted organics and showed excellent performance. The best removal RhB efficiency of Co7Fe3/CoFe2O4@C (Co/Fe = 1:1) is near 100% within 10 min and the lowest ions elution (similar to 0.05 mg/L) under pH = 7, which is also better than the performance of the precursor Co-Fe LDH. Through further cycling experiments and degradation of p-nitrophenol, the stability and catalytic performance of the catalyst were verified. Finally, free radical scavenging experiments prove center dot OH and SO4 center dot(-) radicals participating in the reaction, which are the key factors for degradation. Based on the above, the derivation of the mechanism of Co7Fe3/CoFe2O4@C (Co/Fe = 1:1) catalyzing PMS to degrade polluted organics was proposed, and we consider this catalyst has great application prospect. (C) 2020 Elsevier B.V. All rights reserved.