What is the mechanism for Congo red dye binding onto cellulose fiber?

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Jon Trifol

Hi! Maybe interactions of the amine groups of the dye and of the most accesible OH group of the cellulose?

Mohamed Naseer ali Mohamed

Mainly due to stacking of dye aromatics with the hydrophobic sugar planes of cellulose. Also, there should be hydrogen bonds as pointed out by Jon Trifol. Check the article cited below

"Cellulose, 2012, 19:1495-1506"

Yijie Daniel Deng

I think the hydrophobic interaction may be the main force and pH doesn't affect the binding of the dye.

Yes, I found HCL and NaoH didn't release any dye from binding.