Oxidation is a widely used method in drinking water treatment to mitigate the membrane fouling caused by the natural organic matters (NOM) from the surface water during ultra-filtration (UF) and nano-filtration (NF) processes, and H 2 O 2 is one of the common oxidants for it. However, the oxidation capability of H 2 O 2 at neutral pH is lower, compared to the acidic and alkaline conditions. In order to improve the efficiency of NOM oxidation at neutral pH, a carbon-doped Fe 3 O 4 peroxidase-like nanozyme (CFPN) was synthesized in this study and used as a high-performance catalyst for H 2 O 2 to generate hydroxyl radical . The oxygen-containing groups on the carbon structure of CFPN can form an acidic microenvironment, allowing H 2 O 2 to produce hydroxyl radical by catalysis in neutral conditions. The results of hydrophilicity analysis, zeta potential , high-performance liquid size exclusion chromatography (HPSEC), Fourier transform infrared spectrum (FTIR) and flux indicated that the hydroxyl radical can oxidize the hydrophobic matters of humic acid (HA) into hydrophilic matters by Fenton reaction or electrophilic addition reaction, which can mitigate the fouling of NF membranes. The results of the same test for the bovine serum albumin (BSA) indicated that the hydroxyl radical can mitigate the fouling of UF membranes by degrading the tertiary and secondary structures of BSA and partly oxidizing the side chain groups. In addition, two types of surface water samples were used to verify the above mechanism, and the results indicated that the hydroxyl radical treatment at neutral pH is a new viable and effective strategy to significantly mitigate the NOM fouling of UF and NF membranes.
Since the outbreak of COVID-19, the extensive use of epidemic control drugs such as Arbidol (ARB) and Acyclovir (ACV) has significantly increased and the environmental pollution caused by these residues has attracted increasing attention. In this article, a novel montmorillonite graphene-like carbon hybrid Fe 3 O 4 compound (Mt/GH/Fe 3 O 4 ) as particle electrode catalyst was prepared and applied in three-dimensional-electro-Fenton (3D-EF) for the ARB and ACV degradation. The structure and composition of the compound catalyst were characterized. The degradation efficiency of targets was significantly increased in the 3D-EF degradation system and even more thorough for the degradation of targets, compared with simple 2D, 3D, and EF catalytic degradation systems. The degradation rate of antiviral drugs can reach >90% in 5 min with excellent stability. The research demonstrated that the clay mineral with a special structure loaded with graphene-like carbon and Fe 3 O 4 had supplied an ideal reaction medium for the electro-Fenton reaction. Mt./GH/Fe 3 O 4 -based 3D-EF degradation system would have promising applications in the degradation and removal of antiviral drug residuals in the environment.
危险品化学品经营许可证（带存储）