RESEARCH / A0441
Lattice-sulfur-impregnated zero-valent iron crystals for long-term metal encapsulation
Read the original paper · 10.1038/s41893-024-01409-4 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Fig. 1 | Sulfur-impacted distributions and incorporations of heavy metals over nFe0 nanoparticles. a, Sulfur speciation of S-nFe0 determined by the Fe K-edge Fourier-transformed EXAFS spectra (spheres) and their best shell fits (dotted lines). b, Distributions of heavy metals shown by the overlays of STEM– EDX elemental mappings and relevant high-angle annular dark-field images.
Fig. 3 | Evolution of elemental distributions and relevant depth profiles of metals on the surface and subshell of FeS2-nFe0. a–r, Metal:Fe intensity ratio in the relevant EDX line profiles and elemental maps of FeS2-nFe0 after 5 min of reaction with Zn (a,d,g), Cd (b,e,h) and Pb (c,f,i) and 60 min of reaction with Zn (j,m,p), Cd (k,n,q) and Pb (l,o,r). s,t, XPS depth profiles of Cd (s) and Pb (t) distribution for metal-reacted FeS2-nFe0 after 60 min of reaction. u, Fe K-edge Fourier-transformed EXAFS spectra of metal-reacted FeS2-nFe0 (spheres) and