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Joint synthesis of Zeolite A-LDH from mineral industry waste

2018; Elsevier BV; Volume: 161; Linguagem: Inglês

10.1016/j.clay.2018.04.018

1872-9053

Liliane Nogueira da Silva, D. Moraes, S. C. A. dos Santos, José Augusto Martins Corrêa,

Zeolite Catalysis and Synthesis

This study evaluated the use of waste from the copper concentration process and kaolin processing for the combined synthesis of Zeolite A and layered double hydroxide (LDH). The synthesis occurred in two stages: synthesis of LDH by coprecipitation and submersion in a hydrothermal bath and then the addition of metakaolin for the synthesis of Zeolite A. The synthesized ZA-LDH sample was characterized by X-ray diffraction (XRD), scanning electron microscopy coupled with X-ray energy dispersive spectroscopy (SEM-EDS), N2 physisorption and point of zero charge (PZC). X-ray diffraction detected phases of high structural order, quantified by the Rietveld method in 90.57 Zeolite A, 9.21 pyroaurite and 0.22 anatase (% mass). In adsorption tests, the ZA-LDH showed greater efficiency in dye removal than commercial zeolite.