— The S-mZVI/BC-wet composites encompassed ZVI or FeS 2 particles internally with the main size less than 100 nm, implying that the ball milling process successfully reduced the particle size of mZVI. The lattice fringes of 0.203 were the (1 1 0) facet of ZVI. 0.294 nm and 0.513 nm were the (1 1 0) and (1 0 0) facets of FeS 2, …