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<p>Graphene oxide (GO) has emerged as a promising adsorbent for capturing thorium ions from aqueous solutions. In this work, we demonstrate that the oxidation degree of GO significantly influences thorium adsorption. Five distinct GO samples with carbon-to-oxygen ratios varying from 2.10 to 2.69 were synthesized and subsequently utilized for thorium adsorption experiments. The results showed that thorium adsorption onto all GO samples rapidly equilibrated within 0.5&#xa0;h, adhering to the pseudo-second-order kinetic model. Moreover, a higher pH significantly boosts thorium adsorption across all GO samples. Notably, only the GO samples with higher oxidation degrees exhibited superior adsorption capacities and were less susceptible to ionic strength variations. The GO sample with the lowest oxidation degree achieved a maximum adsorption capacity of 44.2 ± 9.9&#xa0;mg g<sup>−1</sup>, whereas the most oxidized GO sample reached a value of 240.4 ± 8.3 mg g<sup>−1</sup> at pH 2.8.</p>

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Effect of oxidation degree of graphene oxide on the adsorption of thorium ions

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Jie Yang,
  • Bo Li,
  • Ning Luo,
  • Jianrong Wu,
  • Junshan Geng,
  • Qi Cao,
  • Qinzhi Li,
  • Jinsong Zhang

摘要

Graphene oxide (GO) has emerged as a promising adsorbent for capturing thorium ions from aqueous solutions. In this work, we demonstrate that the oxidation degree of GO significantly influences thorium adsorption. Five distinct GO samples with carbon-to-oxygen ratios varying from 2.10 to 2.69 were synthesized and subsequently utilized for thorium adsorption experiments. The results showed that thorium adsorption onto all GO samples rapidly equilibrated within 0.5 h, adhering to the pseudo-second-order kinetic model. Moreover, a higher pH significantly boosts thorium adsorption across all GO samples. Notably, only the GO samples with higher oxidation degrees exhibited superior adsorption capacities and were less susceptible to ionic strength variations. The GO sample with the lowest oxidation degree achieved a maximum adsorption capacity of 44.2 ± 9.9 mg g−1, whereas the most oxidized GO sample reached a value of 240.4 ± 8.3 mg g−1 at pH 2.8.