Sapo-34 Obtained from Amazonian Flint Kaolin: Influence of Impurities of “Oxidized Fe/Ti” in Synthesis and Its Application in the Removal of Cationic Dye from Water

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