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<p>The separation and recovery of rare earth elements from waste materials to achieve sustainable utilization of rare earth resources hold significant economic and social value. In this paper, L-cysteine functionalized graphene oxide adsorbent (LCGO) was used for recovery of La(III). Firstly, versatile techniques including XRD, FESEM/EDX, FT-IR, N<sub>2</sub> adsorption–desorption were leveraged to comprehensively characterize the adsorbent structure. Secondly, the recovery performance of LCGO for La(III) was evaluated through batch experiments. Finally, the adsorption mechanism was examined using XPS and FTIR spectroscopy. Result indicates, at pH = 6, the adsorption of La(III) on LCGO reached equilibrium in 70&#xa0;min, with the recovery percent of 89.78%. The maximum Langmuir adsorption capacity is 845.20 mg·g<sup>− 1</sup>. Moreover, in the presence of common interfering substances, LCGO exhibits preference for La(III).Through the fitting analysis of isotherms and kinetic models, it was demonstrated that the adsorption process of La(III) on the LCGO surface is predominantly governed by chemisorption and exhibits heterogeneous adsorption characteristics with multiple active sites. Remarkable adsorption affinity of –OH, –SH, –C(=O)NH– towards La(III) was disclosed by spectral analysis. Explorations of this work provide reference for recovering rare earth ions using functionalized graphene oxide.</p>

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Recovery Performance and Mechanism of La(III) Onto L-cysteine Functionalized Graphene Oxide

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Chenna Li,
  • Chaoke Bulin,
  • Jinxiao Bao,
  • Yuelong Ma,
  • Ting Guo,
  • Yanhua Zhu

摘要

The separation and recovery of rare earth elements from waste materials to achieve sustainable utilization of rare earth resources hold significant economic and social value. In this paper, L-cysteine functionalized graphene oxide adsorbent (LCGO) was used for recovery of La(III). Firstly, versatile techniques including XRD, FESEM/EDX, FT-IR, N2 adsorption–desorption were leveraged to comprehensively characterize the adsorbent structure. Secondly, the recovery performance of LCGO for La(III) was evaluated through batch experiments. Finally, the adsorption mechanism was examined using XPS and FTIR spectroscopy. Result indicates, at pH = 6, the adsorption of La(III) on LCGO reached equilibrium in 70 min, with the recovery percent of 89.78%. The maximum Langmuir adsorption capacity is 845.20 mg·g− 1. Moreover, in the presence of common interfering substances, LCGO exhibits preference for La(III).Through the fitting analysis of isotherms and kinetic models, it was demonstrated that the adsorption process of La(III) on the LCGO surface is predominantly governed by chemisorption and exhibits heterogeneous adsorption characteristics with multiple active sites. Remarkable adsorption affinity of –OH, –SH, –C(=O)NH– towards La(III) was disclosed by spectral analysis. Explorations of this work provide reference for recovering rare earth ions using functionalized graphene oxide.