Novel nanozyme Ag/Fe3O4@h-BN with peroxidase-mimicking and oxidase-mimicking activities for dye degradation, As(V) removal and detection

Preparation of Fe3O4@CA/BNNS/AgNP Magnetic Microspheres and Photocatalysis of Dyes

“…The distinctive peaks correspond to Fe 3 O 4 , aligning with the reported structure of Fe 3 O 4 . Moreover, the XPS result of B aligns with the known h-BN pattern (Figure f) and the diffraction peaks with larger peak widths and smaller peaks are known to be those of BNNS according to Xin et al Furthermore, the spectrum of N is shown in Figure S4. In conclusion, the successful synthesis of Fe 3 O 4 @CA/BNNS/AgNPs was confirmed through XPS and XRD analyses.…”

“…The effects of Fe 3 O 4 @CA/BNNS/AgNP dosage (ranging from 0.01 to 0.05 g) on the catalytic activity of RhB are shown in Figure c. In particular, from 0.01 to 0.02 g of microspheres, a notable enhancement in the dye degradation efficacy is observed (about 20% difference in dye removal at 30 min) and the catalytic degradation rate is faster at 0.02 g. However, it is obvious from the figure that the dye degradation rate is already better when the mass of Fe 3 O 4 @CA/BNNS/AgNPs is increased to 0.02 g. The results indicate that a suitable dose of composite microspheres will enhance the generation of electron–hole pairs and facilitate interfacial charge transfer, resulting in better photocatalytic activity of Fe 3 O 4 @CA/BNNS/AgNPs. , …”

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][199][200][201][202][203][204][205][206][207][208][209][210][211][212][213][214][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.…”

New synthetic strategy toward a natural enzyme–nanozyme hybrid dual-function nanomotor and its application in environmental remediation

“…28 Under acidic conditions, these nanomaterials with peroxidase properties can decompose hydroxyl radicals from hydrogen peroxide and oxidize colorless substrates to produce the corresponding color, where the catalytic process is in accordance with the Fenton reaction mechanism and exhibits stable catalytic activity over a wide pH range. 29 Xin 30 et al synthesized a novel nanozyme (Ag/Fe 3 O 4 @h-BN) with peroxidase and catalase properties, which showed degradation rates of over 99.5% for various dyes. It has been demonstrated that the combination of nanozymes and natural enzymes not only obtains high selectivity and stability, but also enhances catalytic activity, with costs within a controllable range.…”