I was wondering whether polymers (natural or synthetic) which are acidic in nature able to adsorb acidic dyes or not? For instance, does acrylamide based polymer possess the ability to adsorb acidic dyes such as phenol red or reactive dye like Reactive Black-5? I would like views on this topic.
Given the disparity of functional groups that dyes may have, I wouldn't rule out different kinds of significant interactions. Hence, giving you a generalized answer is risky, to say the least. You may want to look up in the literature your specific system, try it at the lab, or run DFT simulations. Whatever the case, I advise against generalizations or rules of thumb when dealing with complex molecules.
Noor ul Ain
Polyacrylamide has the basic properties of the amide group. Phenolic red acid-base indicator. Depending on the pH of the aquatic environment, it acquires a different color. So, if you want to bond polyacrylamide and phenol red, they must have different + and - charges. In an acidic environment, polyacrylamide will have a + charge on the amide group, and a - phenol red charge on the sulfo group.
The active functional groups of polymer when used as adsorbent plays vital role for dye adsorption. In this case, polymer has net positive charge (amide group) and phenol red has negative charge (sulphate), so there is possibility of adsorption, however, as Sir Yuri has said, pH of the medium also plays a significant role, and cannot be ignored.
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