Hierarchical AuNPs-Loaded Fe3O4/Polymers Nanocomposites Constructed by Electrospinning with Enhanced and Magnetically Recyclable Catalytic Capacities

Abstract

Gold nanoparticles (AuNPs) have attracted widespread attention for their excellent catalytic activity, as well as their unusual physical and chemical properties. The main challenges come from the agglomeration and time-consuming separation of gold nanoparticles, which have greatly baffled the development and application in liquid phase selective reduction. To solve these problems, we propose the preparation of polyvinyl alcohol(PVA)/poly(acrylic acid)(PAA)/Fe3O4 nanocomposites with loaded AuNPs. The obtained PVA/PAA/Fe3O4 composite membrane by electrospinning demonstrated high structural stability, a large specific surface area, and more active sites, which is conducive to promoting good dispersion of AuNPs on membrane surfaces. The subsequently prepared PVA/PAA/Fe3O4@AuNPs nanocomposites exhibited satisfactory nanostructures, robust thermal stability, and a favorable magnetic response for recycling. In addition, the PVA/PAA/Fe3O4@AuNPs nanocomposites showed a remarkable catalytic capacity in the catalytic reduction of p-nitrophenol and 2-nitroaniline solutions. In addition, the regeneration studies toward p-nitrophenol for different consecutive cycles demonstrate that the as-prepared PVA/PAA/Fe3O4@AuNPs nanocomposites have outstanding stability and recycling in catalytic reduction.

Fabrication of tunable hierarchical MXene@AuNPs nanocomposites constructed by self-reduction reactions with enhanced catalytic performances

“…The layered MXene acts as a supporter and reductant in the reaction process. The obtained MXene@AuNPs composites exhibit exceptional performances for the model reduction reaction of nitro-compounds, such as 2-nitrophenol (2-NA) and 4-nitrophenol (4-NP) [46][47][48]. Additionally, we study the size of surface-reduced gold particles and their catalytic effects on 2-NA and 4-NP at different reaction times.…”

In Situ Growth and Size Regulation of Single Gold Nanoparticles in Composite Microgels

“…Due to the softness of the MGs and their small size, they can easily be endocytosed by cells, which further makes them excellent candidates for applications in the biomedical and biotechnological field . Besides, the synthesized MGs with single AuNP of defined size and shape offer the possibility to construct new self‐assembled nanostructures to build functional nanocomposite materials . Furthermore, it is conceivable that the comonomer AAEM, that is responsible for nucleation and growth of single AuNP in MGs, can be substituted by other components with good biocompatibility.…”

“…The flexible integration of functional groups allows a tailored functionalization with different macromolecules, such as dyes, drugs, enzymes, metal complexes as well as nanoparticles (NPs). Moreover, MGs loaded with NPs are perfect candidates for self‐assembly processes, to construct organized nanocomposite materials, which have gained considerable attention during the last few years . Consequently, a multitude of possible applications in biotechnology, biomedicine (imaging agents, drug carriers, etc.…”

Spherical Gold Nanoparticles (AuNPs) Formation by Selected Intracellular Protein Fraction of Fungi

“…AuNPs is range 10-20 nm), but slight agglomeration behavior appeared because of synthesizing more than 90% irregularly shaped particles and smaller sizes which resulted in larger surface area [20]. Furthermore, the particle sizes produced by P5…”