Preparation of a Fungal-Modified Material Linked by the Monoamidoxime Terminal Open-Chain Polyether and Its Uranyl Adsorption

In this study, some synthetic methods of condensation, substitution, and amidoxime reaction were used to prepare a kind of new fungal-modified material containing the monoamidoxime terminal open-chain polyether, and its microstructure and morphology were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis, and thermogravimetric analysis. The single-factor method was used to preliminarily investigate uranium(VI) adsorption capacity of the target material influenced by some factors. On this basis, then the orthogonal experiment was applied to further obtain the optimal adsorption conditions (initial U(VI) concentration: 40 mg L-1 solid-liquid ratio: 25 mg L-1, initial pH value: 6.0, and contact time: 130 min) and the maximum adsorption capacity (295.48 mg g(-1)). The cyclic adsorption-desorption and anti-interference experiments showed that the target material had good regeneration and uranyl selectivity adsorption performance. Langmuir (nonlinear) (R-2 = 0.9704) and Freundlich (nonlinear) (R-2 = 0.9675) isotherm models and a pseudosecond- order kinetic model (linear) (R-2 = 0.9922) were closely fitted with experimental data, and the uranyl-loaded mechanism should be mainly the monolayer and chemical adsorption process.

Automated summary

The study involved the synthesis of a new fungal-modified material using various methods, characterization of its microstructure and morphology, and investigation into its uranium(VI) adsorption capacity. Optimal adsorption conditions and maximum capacity were determined through single-factor and orthogonal experiments. The target material exhibited good regeneration and uranyl selectivity, with Langmuir, Freundlich, and pseudosecond-order kinetic models fitting experimental data well. The adsorption mechanism was identified as mainly monolayer and chemical adsorption process.