The cyclomatrix phosphazenes-co-3,3'-sulfonyldianiline PSD-NH2 microspheres with active amino groups on the surface were prepared by precipitation which was used to removal organic dyes from aqueous solution. The synthesized amino cyclomatrix phosphazenes (PSD-NH2) microspheres were characterized by FT-IR, SEM, XPS and XRD. The effects of different pH, sorbent dosage, contact time, initial Congo red (CR) concentration and different temperature on the adsorption of Congo red by the cross-linked microspheres were studied. The experimental data sh...
