INVESTIGATION OF Co(II) ADSORPTION ONTO RICE HUSK ASH: KINETICS, ISOTHERMS, AND THERMODYNAMICS

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This research aims to evaluate the efficiency of rice husk ash in adsorbing Co(II) ions from water and to understand the underlying mechanisms involved.
Analyzed physicochemical properties of RHA using SEM-EDS and FTIR.
Conducted experiments varying pH, RHA dosage, initial Co(II) concentration, contact time, and temperature.
Applied kinetic and isotherm models to evaluate adsorption behavior.
Freundlich isotherm model showed high accuracy with R² = 0.9993; indicating multilayer adsorption.
Kinetic analysis indicated that the pseudo-second-order model best fits the data with R² = 0.9989, suggesting chemisorption dominance.
Thermodynamic evaluation confirmed spontaneous adsorption behavior.

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Investigates Co(II) ion adsorption efficiency in rice husk ash, suggesting sustainable waste use for water purification.

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Sevgi Polat (2026) studied this question.

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