Magnetic hollow poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol)-Fe3O4 hybrid nanocapsules for adsorbing Safranine T and catalytic oxidation of 3,3',5,5'-tetramethylbenzidine

Yahuan Wang; Chengyu Lin; Zhiwei Wang; Zhimin Chen; Jiafu Chen; Yong Chen; Shaohua Liu; Jianwei Fu

doi:10.1016/j.jcis.2019.08.073

Magnetic hollow poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol)-Fe₃O₄ hybrid nanocapsules for adsorbing Safranine T and catalytic oxidation of 3,3',5,5'-tetramethylbenzidine

J Colloid Interface Sci. 2019 Nov 15:556:278-291. doi: 10.1016/j.jcis.2019.08.073. Epub 2019 Aug 21.

Authors

Yahuan Wang¹, Chengyu Lin², Zhiwei Wang¹, Zhimin Chen¹, Jiafu Chen¹, Yong Chen¹, Shaohua Liu³, Jianwei Fu⁴

Affiliations

¹ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, PR China.
² International College of Zhengzhou University, Zhengzhou University, Zhengzhou 450052, PR China.
³ State Key Laboratory of Precision Spectroscopy & School of Physics and Materials Science, East China Normal University, Shanghai 200241, PR China.
⁴ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, PR China. Electronic address: jwfu@zzu.edu.cn.

PMID: 31454620
DOI: 10.1016/j.jcis.2019.08.073

Abstract

The development of novel adsorbents with high adsorption capacity and easy recovery property is imperative in the field of wastewater treatment. In this study, a hard template-induced assembly strategy was developed to fabricate the magnetic hollow poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol)-Fe₃O₄ (PZS-Fe₃O₄) hybrid nanocapsules, in which Fe₃O₄ nanoparticles were well embedded in the cross-linked PZS shell. The resulting samples were well characterized using SEM, TEM, EDS, FT-IR, VSM, XPS, XRD and N₂ sorption. Then, using Safranine T (ST) as model dye, the adsorption behavior of as-prepared hollow PZS-Fe₃O₄ nanocapsules including adsorption kinetics, adsorption isotherms, adsorption mechanism, and recyclability were systematically evaluated and discussed. The results revealed that the magnetic hollow PZS-Fe₃O₄ nanocapsules own high adsorption capacity towards ST dye and outstanding magnetic separation functionality. The pseudo-second-order kinetic model and the Langmuir model can well describe the experimental data, and the adsorption process is controlled by more than one diffusion step. The interaction between ST dye and hollow PZS-Fe₃O₄ nanocapsules is ascribed to π-π interaction and electrostatic interaction. The thermodynamic parameters demonstrated that the adsorption processes were physical, endothermic, and spontaneous. Additionally, the magnetic hollow PZS-Fe₃O₄ nanocapsules also shows excellent peroxidase-like catalytic activity in the oxidation of 3,3',5,5'-tetramethylbenzidine with H₂O₂, indirectly confirming the adsorption kinetic results.

Keywords: Adsorption; Catalytic; Hollow; Magnetic; Mechanism; Nanocapsules.