3. (A-a) Schematic illustration of the small iron nanoparticles in a capsule (Fe/C@mSiO
2)
[58], (A-b) schematic illustration of the Sol-Gel coating process and
in-
situ confined thermally reduction strategy for the fabrication of the porous carbon capsulated Fe
0 yolk-shell nanospheres (Fe
0@mC)
[47], (A-c) illustration of the synthesis of hierarchical yolk-shell Fe@SiO
2/Ni nanocomposites
[59], (B) schematic illustration of the synthetic procedure for Fe@PMO with Janus structure
[48], (C) schematic illustration of
in situ confined thermal reduction strategy for preparation of corchorifolius-like structure carbon-coated Fe microspheres (CL-Fe@C)
[49], (D-a) schematic illustration of the nZVI@OMC
[46],(D-b) schematic of nanoscale zero-valent iron in mesoporous carbon (nZVI @C)
[65]