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Chemically functionalized poly(AAm-AMPSA) superadsorbent hydrogels for removal of uranyl from aqueous solutions

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Abstract

In the present study, anionic hydrogels, acrylamide (AAm) monomer, and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPSA) comonomer were prepared in the presence of two different cross-linkers. Then, super-anionic hydrogels were prepared by converting the amide groups of neutral AAm in anionic hydrogels to hydroxamic acid with hydroxylamine hydrochloride. The hydrogels were characterized by FTIR, SEM, TG, and DSC analyses. Uranyl adsorption in the hydrogels was investigated by spectroscopic, kinetic, and equilibrium studies. It was determined that uranyl adsorption kinetics in hydrogels were compatible with pseudo-second-order and intra-particular diffusion models. It was determined that the uranyl adsorption isotherms on the hydrogels were L-type according to the Giles isotherm classification. Adsorption parameters were calculated by applying Freundlich and Langmuir models to these isotherms. In addition, it was determined that the amount of adsorbed uranyl increased with the increase in adsorbent mass, did not change with temperature, decreased in the range of pH 2–4, and increased at pH 4–7. It was observed that super-anionic hydrogels had the highest adsorption capacity among these new hydrogels. In addition, molecular electrostatic potential (MEP) mapping was performed to predict the reactive regions of the hydrogels. The results showed that the theoretical and experimental data of hydrogels are in agreement with each other. In conclusion, it can be said that the anionic and super-anionic hydrogels prepared in this study are unique hydrogels with fast and effective properties in removing uranyl.

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Acknowledgements

The authors thank Prof. Dr. Dursun Saraydın for his ideas in some experiments. The authors also thank Assoc. Prof. Dr. Nihat Karakuş for his help in the calculation of MEP maps.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Sivas Cumhuriyet University, 58140, Sivas, Turkey

    Yasemin Işıkver

  2. MEB, Sivas Science High School, Sivas, Turkey

    Nihat Alkan

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  1. Yasemin Işıkver
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  2. Nihat Alkan
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Contributions

This study was produced from Nihat Alkan’s Master’s Thesis, which was completed under the supervision of YI. The corresponding author YI was responsible for ensuring that the descriptions are accurate and agreed upon by all authors. YI contributed to investigation, conceptualization, methodology, software, validation, formal analysis, data curation, writing—original draft preparation, writing—review and editing, visualization, supervision, and project administration. NA contributed to resources, visualization, official analysis, original drafting. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Yasemin Işıkver.

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Işıkver, Y., Alkan, N. Chemically functionalized poly(AAm-AMPSA) superadsorbent hydrogels for removal of uranyl from aqueous solutions. Polym. Bull. 81, 1019–1042 (2024). https://doi.org/10.1007/s00289-023-05000-3

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