BIOSORPSI ION Ni(II) DAN Cr(VI) OLEH AMPAS SAGU
The presence of heavy metal ions such as N(II) and Cr(VI) in the water environment could be dangerous to human health, thus the attempts to remove these metal ions are needed. Biosorption is an alternative method to remove these contaminants using biomaterial. In this research, the removal of Ni(II) and Cr(VI) ions was done using the dregs of industrial sago as a function of time, pH and solution initial concentration. The result showed that the biosorption equilibrium of Ni (II) and Cr(VI) ions was reached after 15 and 120 minutes, respectively. The biosorption of these metal ions followed the pseudo-second order rate constant with k2 values of 0.56 and 0.05 g min.-1 mg-1 for Ni(II) and Cr(VI) ions, respectively. The optimum pH of the biosorption of these ions was 5 and 2 for Ni(II) and Cr(VI) ions, respectively. The biosorption of these two ions followed Langmuir isothermal with biosorption capacity of 11.01 and 3.05 mg/g for Ni(II) and Cr(VI) ions, respectively. Based on the analysis with FTIR, the functional group involved in the interaction was the hydroxyl group. The best desorption reagent to take the metal ions back after been adsorpted was EDTA 0.1 M for Ni(II) ion and NaHCO3 0.1 M for Cr(VI) ion.
Keywords: sago dregs, biosorption, Ni(II), Cr(VI), desorption
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