Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

Abstract

A simple, mild and green route is developed for the preparation of uniform polystyrene-methyl acrylic acid/ silver (PSMAA/Ag) nanocomposite spheres with high catalytic activities. In this approach, monodisperse polystyrene-methyl acrylic acid (PSMAA) spheres are used as polymeric matrixes; silver precursor-[Ag(NH 3 ) 2 ] + ions are then adsorbed onto the surfaces of PSMAA spheres due to the strong electrostatic attraction between carboxyl groups (electronegative) and [Ag(NH 3 ) 2 ] + ions (electropositive). Meanwhile, [Ag(NH 3 ) 2 ] + ions are reduced to Ag nanoparticles and simultaneously protected by PVP on the surface of PSMAA spheres. In this way, the PSMAA/Ag nanocomposite spheres with loading Ag nanoparticles on PSMAA spheres are prepared in aqueous media without any toxic reagents used during the preparation process. Ag nanoparticles uniformly distribute on the surfaces of PSMAA spheres with its size ranging from 8 to 24 nm. Moreover, the coverage degree of Ag nanoparticles on PSMAA spheres increases with the increasing of concentration of silver precursor-[Ag(NH 3 ) 2 ] + ions. In addition, thermal analysis results show that the prepared PSMAA/Ag nanocomposite spheres exhibit improved thermal stabilities and glass translation temperature when compared to the related neat PSMAA spheres. Catalytic studies indicate that the prepared PSMAA/Ag nanocomposite spheres exhibit high catalytic activities and good recyclability for the reduction of 4-nitrophenol, rendering a potential use in the fields of catalytic reduction of 4-nitrophenol to 4-aminophenol.

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe3O4@SiO2 and Y2O3:Eu3+: Impact of Iron‐Oxide/Silver Nanoparticles on Eu3+ Emission

“…Therefore, the XRD patterns of the Fe 3 O 4 @SiO 2 and Fe 3 O 4 @SiO 2 ‐ Ag nanostructures preserve the (111), (220), (311), (400), (422), (511), (440) and (533) crystal plans of the typical Fe 3 O 4 spinel structure (Figure ). Besides, they contain the mainly characteristic (111), (200), (220) and (311) reflections of the Ag cubic phase (ICDD/PDF 01–1167), confirming the decoration of the Fe 3 O 4 with Ag nanoparticles . The oxidation of the magnetite to hematite in oxygen atmosphere at 800 °C, the XRD pattern shows the presence of (012), (104), (110), (113), (024), (116), (214) and (300) reflections of the rhombohedral structure of the α‐Fe 2 O 3 phase (ICDD/PDF 01–079‐0007), indicating the formation of high crystallinity hematite product.…”

Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties

“…The particles can be further modified to provide new properties to these materials. One modifica- tion is the incorporation of metal nanoparticles into the polymer beads [10][11][12][13][14][15][16][17]. The resulting composites exhibit a double function, they support the metal nanoparticles and prevent their aggregation.…”

Silver Nanoparticles‐Silsesquioxane Nanomaterial Applied to the Determination of 4‐Nitrophenol as a Biomarker

“…Also, Kästner and Thünemann employed AgNP and AgNP modified with glutathione and bovine serum albumin for the same purpose. Silver is widely used and many other papers reported the use of AgNP as the most promisor catalyst for the reduction of 4‐NP . Additionally, the cost for the AgNPs manufacture is very attractive.…”