Síntese e caracterização de zeólita tipo A obtida a partir de caulim natural da Amazônia
Fecha
2020-04-17Autor
http://lattes.cnpq.br/9208505196503968
https://orcid.org/0000-0001-9814-9214
SANTOS, Ernélison Angly da Silva
Metadatos
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The synthesis of zeolite A has been an alternative for the production of ceramics for the purpose
of water treatment. The structure of the zeolite is formed by a labyrinth of nanometric scales of
molecular size pores with irregular arrangements of channels and cavities that can be filled by
water or other molecules, which gives a special feature called “molecular sieve”, justifying its
application as a filter medium, as this allows the total removal of heavy metals dissolved in the
fluid. This research studied the ceramic processing of type A zeolite synthesized in the
laboratory from Amazonian kaolin for possible application as water filtering ceramics. The
synthesis was carried out using the hydrothermal method with calcination in a muffle furnace
at 800 ºC for 2 h, followed by cationic exchange (Na +) in the presence of a 2.25 mol / L NaOH
solution, heated next to the activated kaolin conditioned in a reactor at temperature 110 ºC for
4 h. The samples were characterized by X-ray diffraction and thermo analytical analysis (TG /
DTG / DSC / DTA), formed into pellets and calcined at 500, 600 and 700 ºC for 4 h. After the
heat treatment, the parts were physically evaluated for density, porosity and mechanical
resistance to the passage of water, the density results were subjected to DBC statistical
treatment with ANOVA and Tukey's test. The statistical conclusion was that: at 600 ºC only
zeo_01 presented satisfactory results, at 700 ºC the three types of zeolites presented acceptable
results and at 500 ºC no samples obtained acceptable density according to the criterion of 5%
significance in the F-statistic (Fisher-Snedecor). The research concluded that the zeolite A
synthesis process is efficient for all studied samples, the ceramic processing showed a better
result for the sample identified as zeo_04 at a temperature of 700 ºC, as it reached mechanical
resistance, apparent porosity and absorption index of satisfactory water levels maintaining the
crystallographic phase.