what is the main reason of getting light red wine color type, after treating the chromium (VI) solution with amine (ethylene diamine functionalized iron nanoparticles doped carbon) in batch mode ? Usually with decrease in Cr(VI) concentration, the yellow color disappeared and solution became clear. Although, the solution pH was found 8-9 after adsorption. I also checked the iron and chromium conc after adsorption it was below 0.2 ppm for Fe. Chromium also decreases more than 95% as confirmed from ICPMS, AAS analysis and also from DPC methods.
have you tried chemical analyzing the region? i personally am not sure about your answer but an analysis may always help and let you yourself be the first one to find the answer!
It could be tris(ethylenediamine)iron(III) which should be red. Tris(ethylenediamine)chromium(III) should be yellow.
But i have checked the concentration of iron in solution after adsorption it was around 550 ppb using ICPMS while the Cr is in 3 ppm. It will reacts with this reaction and form complex at room temperature?
I think it will create this comples, but I don't know if the color intensity is enough to be visible. Since you have the chemcials you could add increasing concentrations of ethylene diamine to a Fe(III) solution to see the color.
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