We've got FTIR curves of aluminosilicate materials based on fly ash, boiler slag, and their mixture (sintered or self-foamed). We found 4 significant areas there: (I) broad peak at 700-1300 cm-1, (II) "noisy" zone at 1900-2300 cm-1, (III) doublet peak at 2400 cm-1, and (IV) "noisy" zone at 3550-4000 cm-1.
Our thoughts are that (I) is Si–O–Si(Al) stretching, (III) is CO2, (IV) is Si-OH or H2O. There is a problem with zone (II) that we couldn't identify.
Are our thoughts on I, III, IV correct? Which bond can be attributed to II?
Your analysis is right: (I) this peak is assigned to the asymmetric stretching vibration of Si-O terminal (non-bridging) bonds; (II) I think that these noises are associated with residual moisture in the sample or some impurities or side reactions during the alkali activation process; (III) this peak is associated with the stretching vibrations of CO₂. (IV) These noises are assigned to the vibration of O-H groups (there is some bound water within the reaction products).
Mahmoud Elmaasrawy thanks for the answer. Speaking of (II), the problem is that there was no alkali activation, just sintering of fly ash 1, boiler slag 3, and ash-slag compound 5, and their mixtures with borax (2, 4, 6, respectively). Considering that all compositions have the area (II), it is obvious that it is something within the waste.
We presumed that it is water, but this area for water should be in 1300-1900 cm-1. Can this "water" area be shifted to the right?
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