Abstract
The non-processed kaolin (flint kaolin) from a mine located in the Capim area (Amazon region, northern Brazil) considered a waste was selected as a source of silicon and aluminum in the synthesis of SAPO-34, a molecular sieve and cationic exchanger chosen for tests in the removal of methylene blue in aqueous solution, which is a cationic dye widely used by textile industries in Brazil. The results revealed that the SAPO-34 has been successfully synthesized with typical cubic morphology, good crystallinity (> 90%) and thermal stability (~ 998 oC). And although the oxidized Fe/Ti impurities contained in the flint kaolin affects the degree of crystallinity of the zeolitic product, its adsorptive properties are not significantly affected, which showed the excellent adsorption results (pH = 11; % removal > 90%), which proved to be an adsorbent with considerable adsorption capacity (9.83 mg.g-1). The pH test confirmed the acidic surface characteristic (pH solution 2 - 4; ↓ removal) and the kinetic model that best fitted the experimental data was the pseudo-second-order with R2 = 0.998 (kinetics controlled by chemisorption).
Published Version
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