Adsorption isotherms for copper and chrome removal from landfill leachate
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Introduction: the treatment of leachates containing heavy metals, such as copper (Cu) and lead (Pb), is crucial as their levels often exceed permissible limits established by regulations. This study focuses on evaluating the efficiency of treating these metals using adsorption with processed coffee pulp.
Objective: the objective of this study is to determine the removal rates and adsorption capacity of copper and lead in landfill leachates.
Methods: adsorption isotherms were conducted in individual solutions using the Langmuir and Freundlich models. A 2^3 experimental design and response surface analysis were applied to evaluate the variables. Additionally, thermodynamic parameters were determined to understand the type of adsorption.
Results: the results indicate that the Langmuir model best fits the adsorption of copper and lead. The maximum adsorption capacities for copper at doses of 1.3 and 5 g of adsorbent material were 0.29, 0.12, and 0.59 mg/g, while for lead, they were 0.05, 0.02, and 0.02 mg/g. The adsorption rates for copper were 65.3%, 71.0%, and 69.4%, and for lead, they were 30.30%, 13.80%, and 25.40% at the respective doses.
Conclusion: the thermodynamic parameters suggest that the adsorption mechanism is chemical in nature, supporting the effectiveness of processed coffee pulp as an adsorbent material for the removal of heavy metals in leachates.
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Accepted 2024-08-21
Published 2024-10-07
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