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<p>In this study, graphitic carbon nitride (gCN) enriched with carboxylic and hydroxyl groups was synthesized via thermal condensation, followed by acid and hydrogen peroxide treatment. This ‘Oxygen’ enriched gCN, denoted as gCN–OH, was characterized using FT-IR, SEM, XRD, and TGA analysis. U(VI) adsorption efficiency of gCN–OH was evaluated via batch experiments. The kinetic study showed adsorption equilibrium was reached within 80&#xa0;min. The equilibrium adsorption capacity from isotherm experiments was 254.1&#xa0;mg&#xa0;g<sup>−1</sup>. Temperature-dependent studies indicated the adsorption process is endothermic and spontaneous. U(VI) could be desorbed from loaded gCN–OH using 0.01&#xa0;M HNO<sub>3</sub> and gCN–OH can be reused multiple times.</p>

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Enhanced removal of uranium from aqueous solutions using ‘oxygen donor’ enriched graphitic carbon nitride adsorbent

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • M. Dhanu,
  • N. Priyadarshini,
  • Ilaiyaraja Perumal,
  • G. Suresh,
  • M. Santhamoorthy

摘要

In this study, graphitic carbon nitride (gCN) enriched with carboxylic and hydroxyl groups was synthesized via thermal condensation, followed by acid and hydrogen peroxide treatment. This ‘Oxygen’ enriched gCN, denoted as gCN–OH, was characterized using FT-IR, SEM, XRD, and TGA analysis. U(VI) adsorption efficiency of gCN–OH was evaluated via batch experiments. The kinetic study showed adsorption equilibrium was reached within 80 min. The equilibrium adsorption capacity from isotherm experiments was 254.1 mg g−1. Temperature-dependent studies indicated the adsorption process is endothermic and spontaneous. U(VI) could be desorbed from loaded gCN–OH using 0.01 M HNO3 and gCN–OH can be reused multiple times.