1 research outputs found
Joule Heating Induced Reductive Iron–Magnesium Bimetallic Nanocomposite for Eminent Heavy Metal Removal
Fe0-based materials exhibit great power in removing
heavy metals, but their passivation issues remain a challenge. Guided
by the synergistic effects within bimetallic modifications, a novel
reductive FeMg bimetallic nanocomposite (FeMg/NC) was constructed
using flash Joule heating technology. The ultrafast heating and quenching
process achieved a phase-fusional structure comprising Fe0 and Mg0 encapsulated in the resulting aromatic-carbon
layer. Incorporation of highly reductive Mg0 into Fe0-based material led to an approximately 2–3 times enhancement
in pollutant removal efficiency compared to monometallic nanocomposites.
Experiments and theoretical calculations revealed that this augmented
removal efficiency arose from the FeMg dual-site synergistic effect,
facilitating the interaction between FeMg/NC and the targeted pollutants.
That is, adsorption led to the directional inward diffusion of pollutants,
and the outward release of electrons from this formed phase-fusion
structure was accelerated via the electron delocalization effect.
Therefore, FeMg/NC exhibited excellent removal capacities for typical
heavy metals (including Cr(VI), Sb(V), Ni(II), and Cu(II)). This study
demonstrates the flexibility of Joule heating technology for constructing
bimetallic nanocomposite, which can effectively address heavy metal
pollution and opens up endless possibilities for developing more impactful
environmental remediation materials