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This study investigates the adsorptive removal of Congo red dye from wastewater using raw chicken eggshell, CaO derived from calcined eggshell, and commercial CaO as adsorbents. Batch adsorption experiments were conducted to determine equilibrium time and analyze adsorption isotherms. Characterization of the materials using XRD, XRF, FT-IR, FT-Raman, and BET confirmed that the calcination process effectively transforms CaCO3 in the raw eggshell into CaO, significantly increasing surface area and pore volume. These improvements enhance the material’s adsorption performance. The adsorption of Congo red reached equilibrium within 90 min for all adsorbents. Among the tested materials, CaO from eggshell exhibited adsorption capacity comparable to that of commercial CaO, while raw eggshell showed lower performance due to limited surface properties and basicity. Adsorption isotherm data for all adsorbents were better fitted with the Langmuir model, indicating a monolayer physical adsorption process. Overall, the results demonstrate that chicken eggshell waste, when thermally treated, is a promising and sustainable adsorbent for dye removal from wastewater.

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Sustainable Utilization of Chicken Eggshell Waste for Adsorptive Removal of Congo Red Dye from Wastewater

  • 会议论文

  • 发表日期：

    2026年

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  • Kanyakorn Leelahakarnjana,
  • Rawisara Triyaprasertporn,
  • Weerawat Clowutimon,
  • Pornsawan Assawasaengrat

摘要

This study investigates the adsorptive removal of Congo red dye from wastewater using raw chicken eggshell, CaO derived from calcined eggshell, and commercial CaO as adsorbents. Batch adsorption experiments were conducted to determine equilibrium time and analyze adsorption isotherms. Characterization of the materials using XRD, XRF, FT-IR, FT-Raman, and BET confirmed that the calcination process effectively transforms CaCO3 in the raw eggshell into CaO, significantly increasing surface area and pore volume. These improvements enhance the material’s adsorption performance. The adsorption of Congo red reached equilibrium within 90 min for all adsorbents. Among the tested materials, CaO from eggshell exhibited adsorption capacity comparable to that of commercial CaO, while raw eggshell showed lower performance due to limited surface properties and basicity. Adsorption isotherm data for all adsorbents were better fitted with the Langmuir model, indicating a monolayer physical adsorption process. Overall, the results demonstrate that chicken eggshell waste, when thermally treated, is a promising and sustainable adsorbent for dye removal from wastewater.