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<p>This research aims to determine the effectiveness of a novel geopolymer as an adsorbent material for the removal of heavy metals, specifically nickel (Ni), cadmium (Cd), and chromium (Cr). Various design procedures were employed to create a series of geopolymers at room temperature, which were tested for their adsorption abilities under isothermal conditions. Clay (kaolin) and metakaolin were combined with additives of sodium silicate and sodium hydroxide to produce the geopolymers. The synthesized geopolymer samples were systematically characterized through XRF, XRD, and SEM. The adsorption properties of these materials were evaluated by varying the Si/Al ratio in their composition. An optimal ratio of 1:2 was identified for effectively removing nickel, chromium, and cadmium from contaminated water. The GP4 geopolymer design had the maximum removal efficiency for all tested heavy metals. The adsorption process included both the outer surface area and the entrance pores of the geopolymers. This work provides new ideas for the fabrication of low-priced, efficient, and easy-to-synthesize adsorbent materials for water treatment and other environmental remediation applications.</p>

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Kaolin/metakaolin-based adsorbent geopolymer for efficient removal of Cd, Cr and Ni heavy metals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月23日

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  • Waleed S. Alhinqari,
  • Riyadh Ramadhan Ikreedeegh,
  • Mohamed Bagané,
  • Anas M. ELshebani,
  • Abdelbasat AM. Kazouri,
  • Muhammad Tahir

摘要

This research aims to determine the effectiveness of a novel geopolymer as an adsorbent material for the removal of heavy metals, specifically nickel (Ni), cadmium (Cd), and chromium (Cr). Various design procedures were employed to create a series of geopolymers at room temperature, which were tested for their adsorption abilities under isothermal conditions. Clay (kaolin) and metakaolin were combined with additives of sodium silicate and sodium hydroxide to produce the geopolymers. The synthesized geopolymer samples were systematically characterized through XRF, XRD, and SEM. The adsorption properties of these materials were evaluated by varying the Si/Al ratio in their composition. An optimal ratio of 1:2 was identified for effectively removing nickel, chromium, and cadmium from contaminated water. The GP4 geopolymer design had the maximum removal efficiency for all tested heavy metals. The adsorption process included both the outer surface area and the entrance pores of the geopolymers. This work provides new ideas for the fabrication of low-priced, efficient, and easy-to-synthesize adsorbent materials for water treatment and other environmental remediation applications.