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<p>A novel adsorbent was synthesized by grafting Di-(2-ethylhexyl) phosphoric acid (D2EHPA) onto chitin, enhancing its affinity for uranium U(VI) from aqueous solutions. Batch experiments to study the effect of pH, contact time, adsorbent dose, competing ions, and volume revealed rapid adsorption equilibrium within 60&#xa0;min, the mechanism of adsorption being governed by both physisorption and chemisorption and intraparticle diffusion as the rate-limiting step. The Langmuir isotherm model indicated a remarkable maximum adsorption capacity of 555&#xa0;mg/g. The synergistic presence of –PO(OH), –NH<sub>2</sub>, and –OH groups enabled potent and selective complexation with U(VI). The adsorbent exhibited excellent reusability through multiple sorption–desorption cycles.</p>

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Study of uranium sorption from aqueous solution using D2EHPA impregnated chitin as a biodegradable natural support

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月6日

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  • Patti Nagabhushanam,
  • Roopa Bose,
  • AswathySivanand

摘要

A novel adsorbent was synthesized by grafting Di-(2-ethylhexyl) phosphoric acid (D2EHPA) onto chitin, enhancing its affinity for uranium U(VI) from aqueous solutions. Batch experiments to study the effect of pH, contact time, adsorbent dose, competing ions, and volume revealed rapid adsorption equilibrium within 60 min, the mechanism of adsorption being governed by both physisorption and chemisorption and intraparticle diffusion as the rate-limiting step. The Langmuir isotherm model indicated a remarkable maximum adsorption capacity of 555 mg/g. The synergistic presence of –PO(OH), –NH2, and –OH groups enabled potent and selective complexation with U(VI). The adsorbent exhibited excellent reusability through multiple sorption–desorption cycles.