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<p>An Fe₂O₃-functionalized brown algae-derived activated carbon (BAAC/Fe₂O₃) nanocomposite was synthesized and evaluated for its efficacy in the adsorption of methylene blue (MB) from aqueous media. The composite was prepared through chemical activation of brown algae biomass with KOH, followed by sol–gel-assisted deposition of Fe₂O₃ nanoparticles. Structural and surface characterizations performed using SEM–EDX, FTIR, and BET analyses confirmed the successful incorporation of Fe₂O₃ and revealed a high specific surface area of 720 m<sup>2</sup>/g with an average pore size of 1.82&#xa0;nm. Batch adsorption experiments demonstrated that BAAC/Fe₂O₃ achieved a maximum MB removal efficiency of 71.19% under optimized conditions (1&#xa0;g adsorbent, 120&#xa0;min contact time). The incorporation of Fe₂O₃ not only enhanced adsorption capacity through increased active surface sites but also imparted magnetic properties that enable facile separation and potential reusability. The findings establish BAAC/Fe₂O₃ as a promising, sustainable, and cost-effective adsorbent for dye removal in controlled aqueous environments, with potential applicability to industrial wastewater pending further validation under complex real-world conditions.</p>

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Enhanced methylene blue adsorption using Fe₂O₃-modified brown algae activated carbon

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Yuli Ristianingsih,
  • Perwitasari Perwitasari,
  • Indriana Lestari,
  • Titi Tiara Anastasia,
  • Apip Amrullah

摘要

An Fe₂O₃-functionalized brown algae-derived activated carbon (BAAC/Fe₂O₃) nanocomposite was synthesized and evaluated for its efficacy in the adsorption of methylene blue (MB) from aqueous media. The composite was prepared through chemical activation of brown algae biomass with KOH, followed by sol–gel-assisted deposition of Fe₂O₃ nanoparticles. Structural and surface characterizations performed using SEM–EDX, FTIR, and BET analyses confirmed the successful incorporation of Fe₂O₃ and revealed a high specific surface area of 720 m2/g with an average pore size of 1.82 nm. Batch adsorption experiments demonstrated that BAAC/Fe₂O₃ achieved a maximum MB removal efficiency of 71.19% under optimized conditions (1 g adsorbent, 120 min contact time). The incorporation of Fe₂O₃ not only enhanced adsorption capacity through increased active surface sites but also imparted magnetic properties that enable facile separation and potential reusability. The findings establish BAAC/Fe₂O₃ as a promising, sustainable, and cost-effective adsorbent for dye removal in controlled aqueous environments, with potential applicability to industrial wastewater pending further validation under complex real-world conditions.