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<p>Aiming at severe heavy metal pollution in wastewater, a novel nFe<sub>3</sub>O<sub>4</sub>&amp;Zn–BTC@TOCNF was synthesized under ambient conditions for high-efficiency adsorption of Cd<sup>2+</sup> and Ni<sup>2+</sup>. SEM, FTIR, XRD, XPS and N<sub>2</sub>-adsorption/desorption were conducted and the removal performance of Cd<sup>2+</sup> and Ni<sup>2+</sup> were discussed in aqueous phase under different conditions. TOCNF loading elevated the crystallinity for the construction of more rigid scaffold. Meanwhile, the physical entanglement, electrostatic attractions, hydrogen and coordination bonds further improved the porosity and stability of nFe<sub>3</sub>O<sub>4</sub>&amp;Zn–BTC@TOCNF. The composite exhibited maximum adsorption capacities of 230&#xa0;mg/g and 67&#xa0;mg/g for Cd<sup>2</sup>⁺ and Ni<sup>2</sup>⁺, respectively. Adsorption kinetics and isothermal adsorption suggested that the quasi-second-order kinetic model was more suitable to describe the adsorption than the quasi-first-order kinetic model. Furthermore, the adsorption process could be well described by Langmuir model, during which, both Cd<sup>2+</sup> and Ni<sup>2+</sup> were adsorbed at surface through monolayer adsorption. In addition, all R<sub>L</sub> values were in the range of 0–1, indicating favorable adsorption of Cd<sup>2+</sup> and Ni<sup>2+</sup> of the composite. Therefore, nFe<sub>3</sub>O<sub>4</sub>&amp;Zn–BTC@TOCNF showed great prospects for the enhancement of water quality polluted by heavy metal.</p>

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Tempo-oxidize cellulose nanofibers based Zn–BTC composite for high-efficiency Cd2+ and Ni2+ removal

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Zilong Deng,
  • Zixuan Wu,
  • Zhongqi Zhao,
  • Haoyu Gong,
  • Yan Zhao,
  • Donglu Fang,
  • Hongcai Zhang

摘要

Aiming at severe heavy metal pollution in wastewater, a novel nFe3O4&Zn–BTC@TOCNF was synthesized under ambient conditions for high-efficiency adsorption of Cd2+ and Ni2+. SEM, FTIR, XRD, XPS and N2-adsorption/desorption were conducted and the removal performance of Cd2+ and Ni2+ were discussed in aqueous phase under different conditions. TOCNF loading elevated the crystallinity for the construction of more rigid scaffold. Meanwhile, the physical entanglement, electrostatic attractions, hydrogen and coordination bonds further improved the porosity and stability of nFe3O4&Zn–BTC@TOCNF. The composite exhibited maximum adsorption capacities of 230 mg/g and 67 mg/g for Cd2⁺ and Ni2⁺, respectively. Adsorption kinetics and isothermal adsorption suggested that the quasi-second-order kinetic model was more suitable to describe the adsorption than the quasi-first-order kinetic model. Furthermore, the adsorption process could be well described by Langmuir model, during which, both Cd2+ and Ni2+ were adsorbed at surface through monolayer adsorption. In addition, all RL values were in the range of 0–1, indicating favorable adsorption of Cd2+ and Ni2+ of the composite. Therefore, nFe3O4&Zn–BTC@TOCNF showed great prospects for the enhancement of water quality polluted by heavy metal.