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Panumas Promthet
Weena Promthet


The biosorption behavior of Cd(II) from aqueous solution onto industrial waste such as tapioca peel was investigated as a function of influence parameters such as contact time, solution pH, initial concentration, temperature, desorption, and regeneration. Results showed that the biosorption was relatively fast, and equilibrium was achieved within 30 min. The tapioca peel exhibited good biosorption potential at pH 5. The experiment data was described better by the Langmuir than the Freundlich isotherm model, with a maximum biosorption capacity of 36.10 mg/g. The biosorption kinetics followed a pseudo-second-order model, and the thermodynamic behaviour indicated that the Cd(II) biosorption onto tapioca peel was an endothermic process. The results of FTIR spectroscopic analysis revealed that hydroxyl and carboxyl groups on the tapioca peel surface were involved in the biosorption of Cd(II). Desorption of Cd-loaded tapioca peel was desorbed by HCl, HNO3, H2SO4, EDTA, MgCl2, and NaCl as the desorbing agents. The results showed that more than 86% desorption of Cd(II) was attained with 0.1 M HCl. The regeneration experiments showed that the biosorption capacity of tapioca peel was a total slightly reduced 6%. Meanwhile, the recovery of Cd(II) was decreased from 88.74 to 70.91% in the sixth cycle.


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