Cotton Textile/Iron Oxide Nanozyme Composites with Peroxidase-like Activity: Preparation, Characterization, and Application

Abstract

At present, both native and immobilized nanoparticles are of great importance in many areas of science and technology. In this paper, we have studied magnetic iron oxide nanoparticles and their aggregates bound on woven cotton textiles employing two simple modification procedures. One modification was based on the treatment of textiles with perchloric-acidstabilized magnetic fluid diluted with methanol followed by drying. The second procedure was based on the microwave-assisted conversion of ferrous sulfate at high pH followed by drying. The structure and functional properties of these modified textiles were analyzed in detail. Scanning electron microscopy of native and modified textiles clearly showed the presence of iron oxide nanoparticles on the surface of the modified cotton fibers. All of the modified textile materials exhibited light to dark brown color depending on the amount of the bound iron oxide particles. Magnetic measurements showed that the saturation magnetization values reflect the amount of magnetic nanoparticles present in the modified textiles. Small-angle X-ray and neutron scattering measurements were conducted for the detailed structural characterization at the nanoscale of both the native and magnetically modified textiles, and different structural organization of nanoparticles in the two kinds of textile samples were concluded. The textile-bound iron oxide particles exhibited peroxidase-like activity when the N,N-diethyl-p-phenylenediamine sulfate salt was used as a substrate; this nanozyme activity enabled rapid decolorization of crystal violet in the presence of hydrogen peroxide. The deposition of a sufficient amount of iron oxide particles on textiles enabled their simple magnetic separation from large volumes of solutions; if necessary, the magnetic response of the modified textiles can be simply increased by incorporation of a piece of magnetic iron wire. The simplicity of the immobilized nanozyme preparation and the low cost of all the precursors enable its widespread application, such as decolorization and degradation of selected organic dyes and other important pollutants. Other types of textilebound nanozymes can be prepared and used as low-cost catalysts for a variety of applications.

Photocurable Hybrid Materials with High Magnetodielectric Coupling

“…In the magnetic composites, the main scattering contribution comes from the magnetic materials, since there is a large difference in the scattering length density (SLD) of magnetic particles and other possible components that give rise to the recorded scattering intensities (e.g., air pores, polymer chains, possible new phases/defects in the polymer coils, etc.). 29 Figure 3a shows the experimental SANS curves obtained for the neat polymer and the composites with the lowest filler content of CFO, Fe 3 O 4 , and NdFeB particles. The signal for the neat polymer film (without the filler) is low and almost at the background level, while the signal of the magnetic nanocomposites presents a power law behavior (it pointed out the presence of large and extended structures with fractal-like organization 30−33 ) independently of the filler type, even for samples with the lowest filler content, as is shown in Figure 3a.…”

Recent Advances in Nanozymes for Bacteria-Infected Wound Therapy

“…33 Bacterial infection not only easily delays the wound healing process, but also easily causes severe tissue and cell damage, and even threatens life. In recent years, among the known nanomaterials researched, there are currently more researched metal nanoparticles (Au, Ag, Pd, and Cu), [34][35][36][37] nanoalloys (gold silver, gold copper, and iron platinum), [38][39][40] compounds (cerium oxide, iron oxide, silicon dioxide, and cadmium selenide), [41][42][43][44][45] carbon-based materials (graphene, carbon nanotubes, fullerenes), [46][47][48] etc. Different materials are used for the development of nanozyme antibacterial agents, which tend to be multifunctional and intelligent in a single system.…”

Structural organization of ionic liquids embedded in fluorinated polymers

“…In this context, small-angle neutron (SANS) or X-ray (SAXS) scattering techniques are among the most suitable techniques. In fact, recently SANS and SAXS were successfully used for the detailed structural characterization at the nanoscale of native and modified (by magnetic nanoparticles) woven cotton textiles and different structural organization of nanoparticles were observed [16]. With respect to ILs, SANS studies have been reported, often relying on the study of the solvent and/or IL influence in the polymeric matrix structure/conformation, solvation and dispersion [17][18][19].…”