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<p>Clean water is an essential requirement for living beings. This becomes difficult to attain as the aquatic systems are contaminated with toxic metals posing environmental health risks. Magnetic nanocomposite was synthesized by co-precipitation method and coated with silica, followed by zirconium deposition and functionalization with graphene oxide. The particles were spherical in shape. FTIR and XPS showed functional groups of magnetite, confirmed silica coating and the deposition of zirconium and graphene oxide. Optimum pH for the adsorption Cd<sup>2+</sup> was 6 at 30&#xa0;min contact time. The MNP-SiO<sub>2,</sub> MNP-SiO<sub>2</sub>-Zr and MNP-SiO<sub>2</sub>-Zr-GO provided the maximum adsorption capacity of 225.73, 233.10 and 235.85&#xa0;mg/g, respectively, for the removal of Cd<sup>2+</sup>. The equilibrium data of all adsorbents conformed to the Langmuir isotherm. Functionalization of magnetite nanoparticles with zirconium and graphene oxide enhanced the adsorption capacity of Cd<sup>2+</sup> ions removal from aqueous solution. The adsorbents could be regenerated four times without any significant change in adsorption capacities for both pollutants.</p> Graphical abstract <p></p>

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The development of Fe3O4-SiO2-Zr-GO nanocomposite for the remediation of Cd2+ from wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月17日

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  • Mandla M. R. Mabaso,
  • Saheed O. Sanni,
  • Samson O. Akpotu,
  • Vusumzi. E. Pakade,
  • Agnes Pholosi

摘要

Clean water is an essential requirement for living beings. This becomes difficult to attain as the aquatic systems are contaminated with toxic metals posing environmental health risks. Magnetic nanocomposite was synthesized by co-precipitation method and coated with silica, followed by zirconium deposition and functionalization with graphene oxide. The particles were spherical in shape. FTIR and XPS showed functional groups of magnetite, confirmed silica coating and the deposition of zirconium and graphene oxide. Optimum pH for the adsorption Cd2+ was 6 at 30 min contact time. The MNP-SiO2, MNP-SiO2-Zr and MNP-SiO2-Zr-GO provided the maximum adsorption capacity of 225.73, 233.10 and 235.85 mg/g, respectively, for the removal of Cd2+. The equilibrium data of all adsorbents conformed to the Langmuir isotherm. Functionalization of magnetite nanoparticles with zirconium and graphene oxide enhanced the adsorption capacity of Cd2+ ions removal from aqueous solution. The adsorbents could be regenerated four times without any significant change in adsorption capacities for both pollutants.

Graphical abstract