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<p>This work engineered an innovative cellulose nanofibrils aerogel-immobilized graphene oxide (GO)/magnesium–aluminum layered double hydroxide (LDH) nanostructure (LDGC) for the effective simultaneous sequestration of Cu(II) and Cr(VI) ions in aqueous solution. The composite was synthesized through a facile physical encapsulation method, combining the high porosity of cellulose nanofiber (CNF) aerogels with the multifunctional adsorption sites of GO@LDH. Structural analysis demonstrated that LDGC possessed a markedly increased specific surface area (43.78 m<sup>2</sup>·g<sup>−1</sup>) relative to its constituent materials, coupled with a high density of oxygen-functionalized moieties conducive to heavy metal coordination. Batch adsorption studies revealed outstanding simultaneous removal performance (85&#xa0;mg·g<sup>−1</sup> for Cu(II) and 88&#xa0;mg·g<sup>−1</sup> for Cr(VI) in binary-component systems), representing 318% and 161% improvement compared to single-ion conditions, respectively. Kinetic analyses aligned with the pseudo-second-order model (R<sup>2</sup> &gt; 0.99), suggesting predominant chemisorption mechanisms. The composite maintained &gt; 93% efficiency after 4 regeneration cycles and showed strong resistance to common interfering ions (Ca<sup>2</sup>⁺/SO<sub>4</sub><sup>2</sup>⁻ increased adsorption by 92–105%). This work provides a sustainable strategy for simultaneous heavy metal removal, addressing critical challenges in wastewater treatment through rational design of multifunctional nanocomposites.</p>

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Cellulose nanofiber aerogel-encapsulated GO@LDH nanocomposite for effective simultaneous removal of copper(II) and chromium(VI) contaminants

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Mingjie Guo,
  • Qianyong Liang,
  • Shengjun Xu,
  • Qiaozhu Zhong,
  • Wei Wang,
  • Yan Zhang,
  • Ying Pan,
  • Dihua Wu,
  • Dong Zhang,
  • Ting Lü,
  • Hongting Zhao

摘要

This work engineered an innovative cellulose nanofibrils aerogel-immobilized graphene oxide (GO)/magnesium–aluminum layered double hydroxide (LDH) nanostructure (LDGC) for the effective simultaneous sequestration of Cu(II) and Cr(VI) ions in aqueous solution. The composite was synthesized through a facile physical encapsulation method, combining the high porosity of cellulose nanofiber (CNF) aerogels with the multifunctional adsorption sites of GO@LDH. Structural analysis demonstrated that LDGC possessed a markedly increased specific surface area (43.78 m2·g−1) relative to its constituent materials, coupled with a high density of oxygen-functionalized moieties conducive to heavy metal coordination. Batch adsorption studies revealed outstanding simultaneous removal performance (85 mg·g−1 for Cu(II) and 88 mg·g−1 for Cr(VI) in binary-component systems), representing 318% and 161% improvement compared to single-ion conditions, respectively. Kinetic analyses aligned with the pseudo-second-order model (R2 > 0.99), suggesting predominant chemisorption mechanisms. The composite maintained > 93% efficiency after 4 regeneration cycles and showed strong resistance to common interfering ions (Ca2⁺/SO42⁻ increased adsorption by 92–105%). This work provides a sustainable strategy for simultaneous heavy metal removal, addressing critical challenges in wastewater treatment through rational design of multifunctional nanocomposites.