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    Sustainable Utilization of Chicken Eggshell Waste for Adsorptive Removal of Congo Red Dye from Wastewater
    (2026-01-01)
    Leelahakarnjana, Kanyakorn
    ;
    Triyaprasertporn, Rawisara
    ;
    Clowutimon, Weerawat
    ;
    Assawasaengrat, Pornsawan
    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 CaCO<inf>3</inf> 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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    Adsorption kinetic, equilibrium and thermodynamic study for the removal of Congo Red from aqueous solution
    (2017-12-01)
    Khan, Muhammad Imran
    ;
    Zafar, Shagufta
    ;
    Khan, Muhammad Ali
    ;
    Buzdar, Abdul Rehman
    ;
    Prapamonthon, Prasert
    In this study, the adsorption of Congo red (CR) dye from aqueous solution onto cationic polymeric film (BIII) was investigated at ambient temperature. The effect of operational parameters such as contact time, membrane dosage, initial dye concentration and temperature on the adsorption of CR from aqueous solution was studied. Adsorption kinetics has been studied by employing several kinetic models and attained results showed that the adsorption data fitted-well to the pseudo-second-order kinetic model. Nonlinear forms of two parameters and three parameters isotherms were applied on experimental data and the results indicated that the adsorption data fitted well to the various two and three parameters isotherms. Thermodynamic study showed that the adsorption of CR onto cationic polymeric film (BIII) was an exothermic process.