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For the surface of AC-1, it is considered that the amount of formaldehyde adsorbed onto the activated carbon increased with the introduced amino groups because of the increasing interaction between the surface of the activated carbon and the formaldehyde. NAl developed more impregnation of amino group when subjected to high temperature drying resulting in more introduction of amino group as compared to AC-1 which might have lost surface available nitro group during washing to remove ferrous sulphate. The adsorption of formaldehyde onto the heterogeneous activated carbon was principally based on chemisorption, that is, the interaction between formaldehyde and the amino groups of the activated carbon.

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