A strongly coupled Au/Fe₃O₄/GO hybrid material with enhanced nanozyme activity for highly sensitive colorimetric detection, and rapid and efficient removal of Hg²⁺in aqueous solutions

Abstract

We have developed an efficient strategy for synthesizing a strongly coupled Au/Fe3O4/GO hybrid material to improve the catalytic activity, stability, and separation capability of Au nanoparticles (NPs) and Hg(2+). The hybrid material can be synthesized by the direct anchoring of Au and Fe3O4 NPs on the functional groups of GO. This approach affords strong chemical attachments between the NPs and GO, allowing this hybrid material to ultrasensitively detect Hg(2+) in aqueous solutions with a detection limit as low as 0.15 nM. In addition, the deposition of Hg(0) on the surface of Au/Fe3O4/GO could be quickly (within 30 min) and efficiently (>99% elimination efficiency) removed by the simple application of an external magnetic field and then Au/Fe3O4/GO could be subsequently reused at least 15 times, with the elimination efficiency remaining high (>96%).

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

“…Under the optimum conditions, wide linear range of 30-25,000 ng L −1 and low detection limit of 10 ng L −1 are obtained [137]. An coupled Au/Fe3O4/GO hybrid material improves the catalytic activity, stability, and separation capability of AuNPs and Hg 2+ [138]. Multiwalled carbon nanotubes (MWCNTs) have been modified by MNPs with application for the preconcentration of cadmium [139,140] and lead [139] prior to analysis by AAS.…”

Carbon Nanozymes: Enzymatic Properties, Catalytic Mechanism, and Applications

“…Ion detection has attracted considerable attention owing to severely deleterious environmental and medical effects of some cations (Cu 2+ , [73,165] Ag + , [52] Hg 2+ , [52,53,71,81,123,132] and Pb 2+ [132] )and anions (S 2À [94] ). Combining CNT-magnetic silica nanoparticles hybrids with copper-catalyzed click chemistry, our group developed at urn-on sensor for Cu 2+ with high sensitivity and high selectivity.…”

One Step Preparation of Reduced Graphene Oxide/Pd–Fe3O4@Polypyrrole Composites and Their Application in Catalysis

“…Therefore, it was necessary to differentiate them from each other in TEM images.I nF igure 2d, we can see that many nanoparticles with ad iameter of around 30.0 nm are anchored on the rGO nanosheet surface.X -ray diffraction 0629). [25] By using the Debye-Scherrer equation, the averagen anoparticle diameter was calculated to be 28.4 nm. No diffraction peaks corresponding to Pd nanoparticles appeared owing to their small size, highd ispersity,a nd low loading (see below).…”