Abstract
Bentonite insertion was conducted with organometallic compound [Cr3O(OOCH)6(H2O)3](NO3)) and then tested its stability at various pH, then its interaction between bentonite inserted by organometallic compound [Cr3O(OOCH)6(H2O)3] with methylene blue dye. The interaction between organometallic compound [Cr3O(OOCH)6(H2O)3] with methylene blue showed an adsorption rate of 15.49 min-1 at the concentration of methylene blue 25 mg/L. The adsorption capacity and adsorption energy (ΔE) were 2.74 mol/g and 5.58 kJ/mol, respectively, at temperature 70 °C where visible trends of enthalpy (ΔH°) and entropy (ΔS°) values decrease with increasing concentration of methylene blue.
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