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Abstract
This study investigates the adsorption behaviour of copper, zinc, chromium and nickel on plantation crops such as Arecanut husk (AH) and Coconut husk (CH) using a batch technique. Key parameters affecting the adsorption phenomenon were contact time, initial metal ion concentration, and temperature. The results showedequilibrium was reached within four hours, with adsorption capacity being temperature-dependent and endothermic. Efficiency of removal was maximumat lower concentrations, while adsorption capacity improved at higher concentration. Freundlich and Langmuir modelsareappropriatefor predicting the adsorption isotherm. At 300C, the maximum adsorption ofCu, Zn, Cr and Ni on AH and CH were 0.95 mg/g,1.27 mg/g, 0.78mg/g, 0.88 mg/g, 1.22mg/g, 1.64mg/g, 1.66mg/g, and 1.69 mg/g respectively. CH exhibited higher removal and adsorption capacities than AH, with zinc showing the strongest adsorption attraction, following the order Cu < Ni < Cr< Zn for plantation croptypes of adsorbents.
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