Alginate fibers embedded with silver nanoparticles as efficient catalysts for reduction of 4-nitrophenol

Abstract

Silver nanoparticles (AgNPs) have attracted much attention as promising catalysts in various electron transfer reactions due to their high catalytic efficiency. However, their poor stability results in the decrease of the catalytic efficiency and the poor cycling performance, which have hindered the practical application of AgNPs. In this work, alginate fibers embedded with AgNPs were prepared via in situ reduction of Ag + -alginate fibers in the presence of glucose. Field emission scanning electron microscopy (FE-SEM) and Transmission electron microscopy (TEM) indicated that spherical AgNPs dispersed on the surface and the interior of the fibers. The alginate fibers could enable AgNPs to be highly stabilized and thus led to the excellent reusability as heterogeneous catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in aqueous media. The catalytic results indicated that 4-NP could be reduced completely within 15 min. Moreover, the catalyst was easily recovered and reused for at least ten cycles in the reduction reactions, confirming its excellent stability. Most importantly, compared to the conventional powdery catalysts, the fiber catalyst could be handled much more conveniently for re-usage owing to its easily separation.

Efficient 2-Nitrophenol Chemical Sensor Development Based on Ce2O3 Nanoparticles Decorated CNT Nanocomposites for Environmental Safety

“…More oxygen adsorbed on the Ce 2 O 3 doped NCs sensor surface, more oxidizing potentiality, and faster oxidation of 2-NP can be occurred. The action of 2-NP can be extremely immense as compare to other toxic chemicals with the surface under identical conditions [47, 48]. 2-NP can be converted into cyclohexa-3, 5-diene-1, 2-dione under reduction and subsequently oxidation onto the surface of Ce 2 O 3 .CNT NCs whether in exterior or interior of particle-surface or interior-tube.…”

Improvement in mechanical and hygroscopic properties of modified SA fiber crosslinking with PEGDE

“…prepared alginate/poly(caprolactone) composite nanofibros scaffolds using a dual‐jet co‐eletrospinning system, and found that both chemical properties and hydrophobicity of scaffolds were manipulated by regulating the perfusion rates of polymer jets. In addition, functional nanoparticles such as silver nanoparticle and ferric oxide nanoparticle were introduced into SA fiber to render the fiber with special properties …”

Preparation of Ag/C fiber with nanostructure through in situ thermally induced redox reaction between PVA and AgNO3 and its catalysis for 4‐nitrophenol reduction

“…Some of the main benefits of fibrous catalysts include the flexibility of form, low resistance to flow of gas and liquids through a bundle of fibers, high permeability due to their large specific surface area, safer operations, easy scale up, and reusability . In recent years, much effort has been focused on the development of effective strategies to incorporate Ag NPs within various fibers, such as natural fibers like collagen fibers and cellulose fibers and synthesized fibers such as carbon nanofibers, POM/PLLA electro‐spun fibers, alginate fibers, and PAN fibers . For the purpose of full exposure of catalytic Ag NPs, substantial effort has been directed towards uniform surface‐localized particles with various synthesized fibers with functional groups allowing effective chemical or physical interactions with the metal ions or formed NPs .…”