Why does some materials adsorb cationic dye but not anionic dyes?

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Guobing Xiang

Maybe due to those materials are negatively charged.

Mohammad Kooti

Most of the nanomaterials have either positive or negative surface charges. Therefore, they adsorb dyes with opposite charges.

You better determine the zetha potential of the composite you are using to make sure that it has negative charge.

Nagham Zaki

Basic material absorb cation