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<p>In this study, graphene oxide-based hybrid adsorbents (BT01 and BT02) were synthesized and comprehensively characterized to determine their capacity to remove vanadium (IV) from aqueous solutions. Structural analyses such as 32.18% O atom content and specific shifts in XRD and UV-<i>vis</i> analyses proved that GO synthesis, covalent functionalization, and formation of hybrid structures were successful. Furthermore, quantitative EDX analysis of the synthesized metal complexes (BT01-V and BT02-V) showed that the para-isomer (BT01) exhibited a significantly higher V binding capacity, reaching 61.50% V atom ratio, which was approximately twice the 32.29% observed for the meta-isomer (BT02). This striking difference highlights the critical effect of positional isomerism on V affinity. Kinetic and thermodynamic studies indicate that adsorption follows a pseudo-second-order model and is an endothermic or spontaneous process. This research demonstrates that BT01 hybrid has high potential as a selective and high-performance scavenger for heavy metal ions.</p>

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Investigation of the Structure-Activity Relationship of Graphene Oxide Hybrids Modified with Amino Benzoic Acid Isomers in Vanadium Affinity

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Mustafa Bal,
  • Mehmet İsa Tontuş,
  • Mehmet Tümer

摘要

In this study, graphene oxide-based hybrid adsorbents (BT01 and BT02) were synthesized and comprehensively characterized to determine their capacity to remove vanadium (IV) from aqueous solutions. Structural analyses such as 32.18% O atom content and specific shifts in XRD and UV-vis analyses proved that GO synthesis, covalent functionalization, and formation of hybrid structures were successful. Furthermore, quantitative EDX analysis of the synthesized metal complexes (BT01-V and BT02-V) showed that the para-isomer (BT01) exhibited a significantly higher V binding capacity, reaching 61.50% V atom ratio, which was approximately twice the 32.29% observed for the meta-isomer (BT02). This striking difference highlights the critical effect of positional isomerism on V affinity. Kinetic and thermodynamic studies indicate that adsorption follows a pseudo-second-order model and is an endothermic or spontaneous process. This research demonstrates that BT01 hybrid has high potential as a selective and high-performance scavenger for heavy metal ions.