ADSORPTION OF OLEIC ACID USING MCM-41 SYNTHESIZED FROM RICE HUSK SILICA
Keywords:
Free fatty acid, adsorption, MCM-41, oleic acid, rice husk silicaAbstract
Adsorption is one of the methods used to reduce free fatty acid in feedstock oils with high acid content that are used for the production of biodiesel. This work investigated MCM-41synthesized from rice husk silica for the adsorption of oleic acid in isooctane. The adsorption conformed to the Langmuir isotherm model and equilibrium adsorption capacities at 25.0ºC were 277.8 mg/ g for as- synthesized MCM-41 and 270.3 mg/g for template- removed MCM-41. The determined free energy and enthalpy of adsorption showed that the adsorption was spontaneous and exothermic. Adsorption of oleic acid in soy bean oil was also demonstrated. Results showed that as-synthesized MCM-41 was a better adsorbent than template-removed MCM-41 for oleic acid removal from soybean oil.
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