Methylene Blue Removal From Aqueous Solution by Manganese Octahedral Molecular Sieve (K-OMS2) Coated on Activated Alumina Ball
Keywords:
K-OMS2, Methylene blue, PVAAbstract
Manganese octahedral molecular sieve (K-OMS2) coated on activated alumina ball (Al2O3) by using a polyvinyl alcohol (PVA)as a binder for removal of methylene blue (MB). K-OMS2 powder was synthesized by the hydrothermal method followed by coating onto the activated alumina ball (K-OMS2/Al2O3-PVA). The K-OMS2 / Al2O3-PVA was characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Point of zero charges (pHpzc), and Nitrogen adsorption-desorption. The results showed that K-OMS2 had a cryptomelane crystalline structure with fracturing of the K-OMS2 particle on K-OMS2/Al2O3-PVA and pHpzc ≈ 8. The specific surface area was 212.65 m2/g, 0.45 cm3/g of the pore volume, while pore size was 4.19 nm. The kinetics study of MB removal showed the reaction rate increased as temperature increased in the range of the temperature investigated (303 – 333 K), which expressed the pseudo-second-order kinetic model. For the thermodynamic study, the reaction involves spontaneous reactions (-ΔG°), in an endothermic nature (+ΔH°), and with increased randomness (+ΔS°).
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