Modulation synthesis of multi-shelled cobalt-iron oxides as efficient catalysts for peroxymonosulfate-mediated organics degradation

Recent progress in the syntheses and applications of multishelled hollow nanostructures

“…Recently, Zhu et al prepared multishelled CoFe 2 O 4 using a RF colloidal sphere as the hard template. 62 Polyacrylic acid (PAA) is an anionic polymer rich in carboxyls that can efficiently coordinate with metal ions. Therefore, PAA can also be used as a hard template to fabricate multishelled metal oxide hollow nanostructures.…”

Magnetic recyclable CoFe2O4@PPy prepared by in situ Fenton oxidization polymerization with advanced photo-Fenton performance

“…Transition mixed metal oxide, CoFe 2 O 4 , with spinel structure 13 is regarded as one of effective heterogeneous photo-Fenton catalysts along with magnetic recyclability 14,15 as well as unique electrical properties, 16 physicochemical stability, 17 abundant resources, and eco-friendliness. 18 However, poor electron transfer activity and dispersibility severely limit the catalytic activity of the ferrite.…”

In Situ Aluminothermic Reduction Induced by Mechanochemical Activation Enhances the Ability of the Spent LiCoO2 Cathode to Activate Peroxymonosulfate

“…Fitting results revealed that the value of Co 2+ /Co 3+ in the pristine sample was 1.16, but the ratio increased to 1.65 in 500-6h, indicating that reduction occurred in MCA, which increased the Co 2+ content. In the catalytic reaction, Co 2+ is the main active site for the catalytic activation of PMS, and a high Co 2+ content is crucial to enhance the catalytic activity . In 500-6h-N, the ratio was 1.64, and the change in catalytic activity caused by this change was negligible.…”

“…In recent years, the sulfate radical (SO 4 – ) has attracted increasing attention because of its advantages, such as higher redox potential, wider pH range, and longer half-life than the hydroxyl radical ( • OH). − In general, SO 4 – is generated by the activation of peroxymonosulfate (PMS) and peroxydisulfate through heat, UV light, ultrasonic, transition metals (Co 2+ , Mn 2+ , and Fe 2+ ), and nonmetals. Among the above activation methods, transition metals are highly efficient PMS activation catalysts with the advantages of good stability and a high recovery rate . However, traditional transition metal catalysts often require complex preparation and high cost.…”

“…Among the above activation methods, transition metals are highly efficient PMS activation catalysts with the advantages of good stability and a high recovery rate. 14 However, traditional transition metal catalysts often require complex preparation and high cost. Considering that spent LIBs contain transition metals (such as Mn, Co, and Fe), we hypothesized that the cathodes of spent LIBs can be used directly as catalysts.…”