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Paper | Regular issue | Vol 102, No. 2, 2021, pp.231-244
Published online, 21st December, 2020
DOI: 10.3987/COM-20-14366
■ Synthesis of Poly(cyclotriphosphazene-co-3,3'-sulfonyldianilide) Microspheres and Their Adsorption of Anionic (Congo Red) Dye

Zeng Xiong, Yanfei Wang,* Xiaoqing Xie, Honzheng Li, and Chen Yao

*School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001 PR China

Abstract

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 show that the adsorption capacity of PSD-NH2 microspheres on Congo red reaches 186.70 mg/g under the optimal adsorption conditions. It conforms to the pseudo-second-order kinetic equation and Langmuir isotherm model. The selective adsorption mechanism for Congo red dye can be summarized as intermolecular electrostatic interaction, hydrogen bond between PSD-NH2 microspheres adsorbed on the surface and Congo red, π-π and C-H…π stacking and other molecular forces. Thermodynamic studies have shown that the adsorption of Congo redon PSD-NH2 microspheres is endothermic and spontaneous in nature. Thus, amino polyphosphazene (PSD-NH2) microspheres have excellent adsorptionperformance for Congo red.