Removal of mercury(II) from contaminated water by gold-functionalised Fe₃O₄magnetic nanoparticles

Abstract

FeO nanoparticles were prepared by co-precipitation of Fe and Fe and then modified with Au to produce an effective adsorbent (FeO/Au) for aqueous Hg(II) in contaminated water. Rietveld refinement on the XRD pattern confirmed that the FeO/Au was synthesised. Mössbauer spectra exhibited broad and asymmetric resonance lines with two sextets which can be assigned to tetrahedral Fe; and octahedral Fe/Fe. The quantitative analysis of magnetite confirms that the sample shows around 3 wt.% Au and 97 wt.% partially oxidised FeO. High surface area: 121 m g, average pore sizes: 6.3 nm and pore volume: 1.64 cm g. The kinetics data were better fitted with a pseudo-second-order and Dubinin-Radushkevich isotherm suggests the Hg(II) adsorption onto FeO/Au nanoparticles was mainly by chemical adsorption forming complex with the Au metal immobilised on FeO surfaces. Adsorption capacity of 79.59 mg g. Ionic strength and co-existing ions had a slight influence on the adsorption capacity.

Physiological of biochar and α-Fe2O3 nanoparticles as amendments of Cd accumulation and toxicity toward muskmelon grown in pots

“…For example, each gram of the hollow flower-like α-Fe 2 O 3 nanostructures can adsorb 39 mg of Pb 2+ or 48 mg of Cu 2+ [ 22 ]. Even in comparison with traditional mercury adsorption methods, Fe 3 O 4 NPs functionalized with gold showed a high adsorption affinity for mercury, with an adsorption capacity of 79.59 mg/g [ 23 ].…”

Chitosan Grafted with Biobased 5-Hydroxymethyl-Furfural as Adsorbent for Copper and Cadmium Ions Removal

“…Some studies focus on the decontamination (focus on metal ions) following the order of toxicity; the latter means that they investigate the removal majorly of the most toxic metal ions (Hg, Cd, etc.) [39][40][41][42]. Other researchers target on highly-concentrated metal ions (Cu, Zn, etc.)…”