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Abstract <p>Although various forms of biochar derived from waste biomass have been developed for remediating uranium-contaminated water, enhancing the uranium adsorption capacity of biochar remains a critical challenge owing to its limited surface adsorption sites and inherently low hydrophilicity. To address this issue, this study proposes a straightforward method for a coconut shell biochar-based adsorbent incorporating hydroxyapatite (CSB@HAP). CSB@HAP achieving a peak uranium adsorption capacity of 557.12&#xa0;mg&#xa0;g<sup>−1</sup>. The dominant mechanisms governing uranium adsorption by CSB@HAP include electrostatic interactions, complexation, dissolution–precipitation, and ion exchange.</p> Graphical abstract <p></p>

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Enhanced uranium removal using hydroxyapatite-modified coconut shell biochar: synergistic roles of active sites and hydrophilicity

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Xinyi Lv,
  • Yishuo Zhang,
  • Yan Xin,
  • Jiangfeng Zhang,
  • Keng Xuan,
  • Yadan Guo,
  • Guanghui Wang,
  • Zhongkui Zhou

摘要

Abstract

Although various forms of biochar derived from waste biomass have been developed for remediating uranium-contaminated water, enhancing the uranium adsorption capacity of biochar remains a critical challenge owing to its limited surface adsorption sites and inherently low hydrophilicity. To address this issue, this study proposes a straightforward method for a coconut shell biochar-based adsorbent incorporating hydroxyapatite (CSB@HAP). CSB@HAP achieving a peak uranium adsorption capacity of 557.12 mg g−1. The dominant mechanisms governing uranium adsorption by CSB@HAP include electrostatic interactions, complexation, dissolution–precipitation, and ion exchange.

Graphical abstract