Composites of Fe₃O₄, Ag, and Au Nanoparticles for Dye Degradation and Selective Detection of Glutathione

Abstract

In comparison with the poor stability, high cost, and difficult preparation of conventional natural enzymes, nanozymes have the obvious advantages of excellent stability, high catalytic activity, multifunctionality, and large-scale preparation. Herein, a series of Fe3O4 NPs-based magnetic composite with dual enzyme-like activities (peroxidase and oxidase) were successfully synthesized by the microwave-assisted method. Among them, the Fe3O4/Ag Au nanocomposite showed the highest peroxidase-like activity due to the synergistic catalytic effect of Ag and Au bimetallic modifications. Enzyme kinetic studies revealed good kinetic parameters of the Fe3O4/Ag Au nanocomposite for peroxidase, and it also exhibited a higher affinity for TMB compared to natural horseradish peroxidase. In addition, a method for effective dye degradation and selective detection of glutathione was constructed based on its peroxidase-like activity. Importantly, the remarkable magnetic separation property and the outstanding stability proved the extensive application prospects of the nanozymes in the remediation of water pollution and some biomarker-specific detection.

Fenton-like Catalysts Based on Graphitic Carbon Nitride Nanosheets Decorated with Fe3O4 Nanoparticles for Removal of Colorless Tetracycline

“…In the case of the Fe 2p spectra (Figure D), two broad peaks were obtained at 710.7 and 724.5 eV; these can be attributed to the spin–orbit peaks of Fe 2p 3/2 and Fe 2p 1/2 , respectively, which could be fitted by five peaks in total. The peaks at 710.5 and 723.4 eV denote Fe in the second oxidation state, and the peaks at 712.2, 724.5, and 726.1 eV correspond to the Fe 3+ state, suggesting the existence of Fe 3 O 4 on the CN surface. − …”

Nanozymes: powerful catalytic materials for environmental pollutant detection and degradation

“…On the one hand, many materials with peroxidase-like catalytic features have been utilized to fabricate Fenton-like systems to degrade these dyes. 44,198–215 For example, Lin's group presented a strategy to construct graphene–gold nanoparticles (graphene/Au-NPs) through a one-step hydrothermal procedure, which acted as an effective scavenger for dyes with the synergetic impact of degradation and adsorption. 200 When different contents of the graphene/Au-NPs material and H 2 O 2 (300 mM) were introduced to 10 μg mL −1 dye solutions, the remained dye levels were assessed by recording the supernatant's absorbance after removing graphene/Au-NPs.…”