Constructing magnetic Fe₃O₄‐Au@CeO₂ hybrid nanofibers for selective catalytic degradation of organic dyes

Abstract

Au nanoparticles (Au NPs) play a vital role in heterogeneous catalytic reactions. However, pristine Au NPs usually suffer from poor selectivity and difficult recyclability. In this work, Fe 3 O 4 -Au@CeO 2 hybrid nanofibers were prepared via a simple one-pot redox reaction between HAuCl 4 and Ce (NO 3 ) 3 in the presence of Fe 3 O 4 nanofibers. CeO 2 shell was uniformly coated on the surface of Fe 3 O 4 nanofibers to form a unique core-shell structure, while Au NPs were encapsulated inside the CeO 2 shell. The as-prepared Fe 3 O 4 -Au@CeO 2 hybrid nanofibers have been proved to be positively surface charged due to the formation of CeO 2 shell, enabling them to be good candidates for predominant selective catalytic activity towards the degradation of negatively charged organic dyes. In addition, the Fe 3 O 4 -Au@CeO 2 hybrid nanofibers showed magnetic properties, offering them excellent recyclable usability. This work presents a facile and effective solution to prepare magnetic noble metal/ metal oxide hybrid nanomaterials with unique chemical structure and surface characteristic for promising applications in heterogeneous catalysis.

Transition metal sulfides meet electrospinning: versatile synthesis, distinct properties and prospective applications

“…The integration of nanocatalysts with 1D electrospun nanofibers can restrict their aggregation and leaching during the catalytic process, thus producing a large catalytically active sites, which is beneficial for their applications in heterogeneous chemical catalytic reactions. [146][147][148][149] For example, CoS nanoparticles have been encapsulated into PAN nanfibers via a direct electrospinning route, which show an excellent catalytic performance toward ammonia borane hydrolysis to produce hydrogen. 59 Owing to the unique nanoparticles-in-nanofibers structure, the hybrid catalyst shows an outstanding reusability.…”

Recent Advances in Synthesis, Medical Applications and Challenges for Gold-Coated Iron Oxide: Comprehensive Study

“…Nevertheless, Au NPs typically have low selectivity and complex recyclability. Fe 3 O 4 @Au@CeO 2 hybrid nanofibers were prepared in the presence of Fe 3 O 4 nanofibers, through a simple one-pot redox reaction between HAuCl 4 and Ce (NO 3 ) 3 [ 40 ]. On the Fe 3 O 4 nanofibers’ surface, the CeO 2 shell was uniformly coated to form a unique hybrid structure, while the Au NPs were encapsulated within the CeO 2 shell.…”

Synthesis and characterization of silver doped magnetic-nanoclay montmorillonite/iron oxide/silver nanocomposite for environmental applications throught effective dye degradation

“…Researchers are particularly showing great interest iron oxide MNP on account of their unique properties such as fast magnetic recovery, facile detection, and ease of recyclability with an external magnetic eld (Sharma et al 2019). In this context, iron oxide MNP coated with metals such as Ag (Xing et al 2019), Au (Azad et al 2011;Chen et al 2019) and Cu (Ghafuri et al 2019) to improve its catalytic properties have been used for dye degradation in recent years. The catalytic activity of Ag nanoparticles (AgNPs) synthesized with the aim of a more successful dye degradation have been proved by many studies.…”