Magnetic Fe3O4-Ag0 Nanocomposites for Effective Mercury Removal from Water

Abstract

<jats:p>In this study, magnetic Fe3O4 particles and Fe3O4-Ag0 nanocomposites were prepared by a facile and green method, fully characterized and used for the removal of Hg2+ from water. Characterizations showed that the Fe3O4 particles are quasi-spherical with an average diameter of 217 nm and metallic silver nanoparticles formed on the surface with a size of 23–41 nm. The initial Hg2+ removal rate was very fast followed by a slow increase and the maximum solid phase loading was 71.3 mg/g for the Fe3O4-Ag0 and 28 mg/g for the bare Fe3O4. The removal mechanism is complex, involving Hg2+ adsorption and reduction, Fe2+ and Ag0 oxidation accompanied with reactions of Cl− with Hg+ and Ag+. The facile and green synthesis process, the fast kinetics and high removal capacity and the possibility of magnetic separation make Fe3O4-Ag0 nanocomposites attractive materials for the removal of Hg2+ from water.</jats:p>

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

“…A solvothermal synthesis method can be defined as a reaction using an organic solvent such as methanol, ethanol, ethylene glycol or polyol in a closed system at a temperature higher than the boiling point of the solvent [98,99]. In the literature, many surfactants used as capping agents during the solvothermal preparation of monodispersed magnetic NPs have been referenced, such as polyacrylic acid, oleic acid and sodium dodecyl benzene sulfonic.…”

“…The most common method for Ag integration is the reduction of silver ions in a solution or gaseous medium at high temperatures [72]. In most cases, the integration of Ag NPs is realized as a separate synthesis step: In a typical process [98,112,113], the base catalyst or catalyst composite is mixed with a silver-containing compound (such as AgNO 3 ) in a solution that is usually aqueous. The reduction of silver ions (Ag + ) can occur through an added reducing agent or via irradiation (photodeposition), leading to Ag NPs (Ag 0 ).…”

From Impure to Purified Silver Nanoparticles: Advances and Timeline in Separation Methods

“…The literature contains many works involving the separation of AgNPs by magnetic approaches but only when they are incorporated in magnetic nanocomposites, such as magnetic Fe 3 O 4 -Ag(0) [20]. Hence, the number of works involving the separation of single Ag-NPs by magnetic schemes is scarce, probably since AgNPs do have not magnetic properties.…”

Green synthesis of a magnetite/graphitic carbon nitride 2D nanocomposite for efficient Hg2+ remediation

“…29–32 However, cost, scalability, stability, selectivity, regeneration, disposal and performance in complex aqueous matrices limits their widespread applications. Similarly, other materials investigated include porous organic polymers (POPs), 33,34 carbon-based magnetic nanocomposites, 35 silver, 36 and different polymers. 37 Although promising, these materials also have limitations, notably toxicity, precise control of surface properties and polymer size, the viability of commercial-scale production, trace-level detection, and coating concerns.…”