Nucleotide-grafted coal for high-efficiency removal of uranium: performance, optimisation, and insight into the adsorption mechanism.
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| Title: | Nucleotide-grafted coal for high-efficiency removal of uranium: performance, optimisation, and insight into the adsorption mechanism. |
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| Authors: | Shaida, Mohd Azfar1,2 (AUTHOR) mashaida.co@amu.ac.in, Sen, Amit Kumar3 (AUTHOR), Dutta, Raj Kumar1 (AUTHOR) |
| Source: | Environmental Science & Pollution Research. Jun2025, Vol. 32 Issue 27, p16142-16158. 17p. |
| Subject Terms: | *Adsorption (Chemistry), *Radioactive waste management, *Water purification, *Sorbents, *Chemical engineering, *Physisorption |
| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09441344 |
| DOI: | 10.1007/s11356-025-36653-4 |
