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Evaluation of microwave extraction of organic matter present in crushed gels synthesized by atrane way

Abstract:

Gels with a TEA/Si ratio of 1 (G1) were synthesized by atrane way. The microwave extraction of organic matter in these gels was performed varing type of solvent, power and exposure time to microwaves. Monitoring the influence of these parameters was realized by loss mass percentage in solids, infrared spectroscopy (IR) and thermodifferential analysis. Water was the most suitable solvent for the organic matter extraction, and a power of 80% (560 W) with 120 seconds as the optimal values for extraction, with extraction porcentage of 100%. A sample gel was calcined, and characterized by adsorption-desorption isotherm of N2 at 77 K, IR and SEM as comparison bases. The adsorption- desorption isotherm is of IV type, with a surface area of 694 m2/g, pore volume of 0,86 cm3/g y average pore diameter of 4,84 nm. The loss mass percentage of this gel was 95%.