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<p>A nanocomposite of graphene oxide and manganese dioxide (GO/MnO₂) was synthesized and evaluated for its ability to adsorb Alizarin Red (ALZ) from aqueous solutions. The composite exhibited a flake-like, porous morphology, as confirmed by FE-SEM analysis, which contributed to a high surface area and enhanced adsorption performance. Batch adsorption studies were conducted to analyze the effects of initial dye concentration, solution pH, and contact time on dye adsorption efficiency. The (GO/MnO2) nano-composite used as an adsorbent was poured into alizarin solutions (25, 50, 75 and 100 ppm) concentration. The results demonstrated a significant reduction in dye concentration, with direct correlation between dye concentration and adsorption, up to a concentration of 75 ppm and under acidic conditions (pH ≈ 3), where up to 100% dye removal was achieved within 50 min. for a 75 ppm ALZ solution. pH-dependent adsorption behavior suggested a removal mechanism involving both physical adsorption and surface complexation between ALZ functional groups and Mn sites on the composite. Kinetic and equilibrium analyses further confirmed the effectiveness of the GO/MnO₂ nanocomposite as a promising adsorption-catalysis dual-function material for the treatment of dye-contaminated wastewater.</p>

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Graphene oxide/manganese dioxide nano composite: fabrication and application as removal alizarine red from wastewater

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Amal Shakir Abbood,
  • Ibraheem Jaleel Ibraheem,
  • Sattar S. Ibrahim,
  • Kaiss R. Ibraheem

摘要

A nanocomposite of graphene oxide and manganese dioxide (GO/MnO₂) was synthesized and evaluated for its ability to adsorb Alizarin Red (ALZ) from aqueous solutions. The composite exhibited a flake-like, porous morphology, as confirmed by FE-SEM analysis, which contributed to a high surface area and enhanced adsorption performance. Batch adsorption studies were conducted to analyze the effects of initial dye concentration, solution pH, and contact time on dye adsorption efficiency. The (GO/MnO2) nano-composite used as an adsorbent was poured into alizarin solutions (25, 50, 75 and 100 ppm) concentration. The results demonstrated a significant reduction in dye concentration, with direct correlation between dye concentration and adsorption, up to a concentration of 75 ppm and under acidic conditions (pH ≈ 3), where up to 100% dye removal was achieved within 50 min. for a 75 ppm ALZ solution. pH-dependent adsorption behavior suggested a removal mechanism involving both physical adsorption and surface complexation between ALZ functional groups and Mn sites on the composite. Kinetic and equilibrium analyses further confirmed the effectiveness of the GO/MnO₂ nanocomposite as a promising adsorption-catalysis dual-function material for the treatment of dye-contaminated wastewater.