Regulating Interlayer Confinement FeOCl for Accelerating Polymerization of Pollutants to Reduce Carbon Emission in Water Purification

Abstract

The spatial structure regulation of catalysts could optimize the reaction pathway and enhance the mass transfer kinetics, which might realize the efficient and low-consumption removal of pollutants in Fenton-like technology. In this study, N,Ndimethylformamide (DMF) intercalation was used to adjust the interlayer spacing of FeOCl from 7.90 to 11.84 Å by a simple and rapid intercalation method, thereby enhancing the mass transfer kinetics and altering the catalytic pathway. The removal rate of BPA in the DMF-FeOCl/PS system increased by 8.78 times, showing good resistance to complex water environments (such as pH, humic acid, and anions), especially in 5 g/L high-salt wastewater. The direct electron transfer processes between Fe(IV) and pollutants mediated by interlayer Fe sites generate phenoxy radicals, and the polymerization processes occur, achieving efficient removal of pollutants and low CO 2 emissions. This study provides new insight into the efficient and low-carbon treatment of high-salt wastewater.

Transformative Removal of Aqueous Micropollutants into Polymeric Products by Advanced Oxidation Processes

“…For instance, trivalent manganese ions [Mn 3+ (H 2 O) 6 ] can oxidize phenol into PhO • via SET, but they predominantly form oligomers as a result of their lower redox potential (1.54 V). , Recent research highlighted that the oxidation of organics predominantly occurred on the surface of metal oxide with high-valence species (Mn) . These heterogeneous catalysts trigger a direct oxidation pathway (DOTP) to enable surface-dependent coupling and polymerization …”

Regulating the type of nitrogen to improve the performance of Co–N/C with a confinement effect in peroxymonosulfate activation for the effective degradation of organic pollutants

“…17,18 Generally, the spatial confinement effect mainly refers to the chemical reaction being limited to a specific space, and the electronic transport process is remarkably changed, thereby resulting in a change in the chemical reaction system. 19,20 A common way of achieving a spatial confinement effect is the introduction of a carbon layer on the surface of catalysts. 21 Interestingly, some carbon layers may contain nitrogen, and the types of nitrogen present may influence persulfate activation pathways.…”

Electronic structure modulation of iron sites with fluorine coordination enables ultra-effective H2O2 activation

“…This specific coordination regime contributes most in promoting Fe(III) species reduction as well as H 2 O 2 decomposition toward •OH radicals. Afterward, significant endeavors have been made to further improve the activation performance of FeOCl by doping, intercalation, and nanoconfinement engineering while most fails to optimize •OH radical yields with satisfactory selectivity 27 – 29 . Interestingly, the K + intercalation into FeOCl alters the H 2 O 2 activation pathway from •OH radicals to Fe(IV) = O species with improved tolerance to water matrix while the oxidation efficiency may be partially compromised 30 .…”