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<p>Removal of radioactive waste from aqueous medium using cost-effective material is an utmost priority to manage the radioactive waste toxicity. Here we present a novel approach for uranium removal from aqueous system by chemically modifying low-grade coal (low-carbon and high silicate content) with adenosine 5′-monophosphate (AMP) nucleotide and adsorbent referred here as coal@AMP. Functionalisation of coal was carried out by incorporating amide and phosphate functional groups via oxidation and reduction phenomenon. Chemical make-up and structural morphology of coal@AMP was explored using FT-IR and SEM–EDX analysis. Under the optimised pH 6 and adsorbent dose (10&#xa0;mg per 100&#xa0;mL), the coal@AMP exhibited 92.2% removal of uranium from aqueous medium in 300&#xa0;s, following pseudo-second-order kinetics and Langmuir adsorption isotherm. It corresponded to a maximum adsorption capacity (<i>q</i><sub>max</sub>) of 624.6&#xa0;mg/g. The fast and efficient adsorption of uranium by coal@AMP is favoured by the strong interaction or chelation of uranium species with the amide and phosphate groups. Coal@AMP exhibited excellent selectivity towards adsorption of uranium against interfering ions, e.g. Cd<sup>2</sup>⁺, Co<sup>2</sup>⁺, Cu<sup>2</sup>⁺, Fe<sup>2</sup>⁺, Hg<sup>2</sup>⁺, Pb<sup>2</sup>⁺, Mn<sup>2</sup>⁺, Zn<sup>2</sup>⁺, and Ni<sup>2</sup>⁺. The thermodynamic studies favour spontaneous and endothermic nature of adsorption.</p> Graphical Abstract <p></p>

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Nucleotide-grafted coal for high-efficiency removal of uranium: performance, optimisation, and insight into the adsorption mechanism

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Mohd Azfar Shaida,
  • Amit Kumar Sen,
  • Raj Kumar Dutta

摘要

Removal of radioactive waste from aqueous medium using cost-effective material is an utmost priority to manage the radioactive waste toxicity. Here we present a novel approach for uranium removal from aqueous system by chemically modifying low-grade coal (low-carbon and high silicate content) with adenosine 5′-monophosphate (AMP) nucleotide and adsorbent referred here as coal@AMP. Functionalisation of coal was carried out by incorporating amide and phosphate functional groups via oxidation and reduction phenomenon. Chemical make-up and structural morphology of coal@AMP was explored using FT-IR and SEM–EDX analysis. Under the optimised pH 6 and adsorbent dose (10 mg per 100 mL), the coal@AMP exhibited 92.2% removal of uranium from aqueous medium in 300 s, following pseudo-second-order kinetics and Langmuir adsorption isotherm. It corresponded to a maximum adsorption capacity (qmax) of 624.6 mg/g. The fast and efficient adsorption of uranium by coal@AMP is favoured by the strong interaction or chelation of uranium species with the amide and phosphate groups. Coal@AMP exhibited excellent selectivity towards adsorption of uranium against interfering ions, e.g. Cd2⁺, Co2⁺, Cu2⁺, Fe2⁺, Hg2⁺, Pb2⁺, Mn2⁺, Zn2⁺, and Ni2⁺. The thermodynamic studies favour spontaneous and endothermic nature of adsorption.

Graphical Abstract