Multifunctional bipyridinium-salicylidene chitosan Schiff base nanobiosorbent for enhanced copper(II) uptake: Synthesis, characterization, performance, and DFT insight in adsorption processWesam Abd El‐Fattah, Reda F.M. Elshaarawy, Naoufel Ben Hamadi et al.|Reactive and Functional Polymers|2025Cited by 7