Skip to main content
. Author manuscript; available in PMC: 2016 Aug 15.
Published in final edited form as: J Memb Sci. 2015 Aug 15;488:79–91. doi: 10.1016/j.memsci.2015.03.089

Fig. 12.

Fig. 12

Iron oxide formation on iron nanoparticle surface during selenium removal (anaerobic). (A) Freshly made iron; (B) (C) iron/iron oxide after reaction; (D) STEM-EELS mapping of iron oxide. Red/blue/brown colors indicate Se/O/Fe, respectively. Sample preparation: fresh iron nanoparticles ([Fe]0=0.50±0.02 g/L) were mixed with Na2SeO4 solution for 24 h ([Se]0=100 mg/L, [Ethanol]:[Deoxygenated water]=9:1, v/v). After that, iron was washed with deoxygenated water and pure ethanol, and sonicated for 30 s. TEM grid (lacey carbon film on 300 mesh copper grids) was soaked in diluted solution for seconds and dried in N2 atmosphere before mounted in TEM sample holder.