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.

中文翻译：

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聚（环三磷腈-

所述cyclomatrix phosphazenes-共-3,3'- sulfonyldianiline PSD-NH 2个微球表面上的活性氨基在其用于从水溶液中去除有机染料沉淀制备。通过FT-IR，SEM，XPS和XRD对合成的氨基环基质磷腈（PSD-NH 2 ）微球进行了表征。研究了不同pH，吸附剂用量，接触时间，初始刚果红（CR）浓度和温度对交联微球吸附刚果红的影响。实验数据表明PSD-NH 2的吸附能力在最佳吸附条件下，刚果红微球达到186.70 mg / g。它符合拟二阶动力学方程和Langmuir等温线模型。刚果红染料的选择性吸附机理可以概括为分子间静电相互作用，表面吸附的PSD-NH 2微球与刚果红之间的氢键，π-π和CH…πstacking和其他分子力。热力学研究表明，刚果红PSD-NH 2微球的吸附性质是吸热的，并且是自发的。因此，氨基聚磷腈（PSD-NH 2 ）微球对刚果红具有优异的吸附性能。