Caracterização de argilas bentonitas e diatomitas e sua aplicação como adsorventes

Abstract

Recebido em 23/9/08; aceito em 28/4/09; publicado na web em 6/10/09 BENTONITES AND DIATOMITES CLAYS CHARACTERIZATION AND APLICATION IN ADSORPTION. Five samples of natural clays denominated: diatomite, CN-20, CN-29, CN-40 and CN-45 from Aliança Latina LTDA were characterized by differents supplementary techniques such as: XRD, chemical analysis, adsorption N 2 measurements, infrared spectroscopy analysis, thermogravimetric analysis. Clays were tested in adsorption of blue methylene. All of isotherms adjust in a model of physics adsorption with formation of multilayers, however in the case of diatomite was a favorable adsorption (type II) and the CNs were a not favorable adsorption (type III). In the case of CNs had flocculation of clay in high concentration of coloring.

Cu0and Pd0loaded Organo-Bentonites as Sponge-like Matrices for Hydrogen Reversible Capture at Ambient Conditions

“…Bentonite is a low cost and widely available clay material that contains an abundant lamellar aluminosilicate (montmorillonite). This material displays interesting surface properties for various applications involving adsorption and catalysis even without previous purification . The detrimental presence of some dense silica phases can be compensated by a judicious grafting of dendritic moieties bearing suitable chemical groups.…”

Characterization of Unye bentonite after treatment with sulfuric acid

“…[3][4][5] The primary uses for acid activated bentonites are waste water treatment, catalysis, industrial, medical, sorption, and environmental remediation or protection applications. [6][7][8][9][10] However, the microstructural properties of activated clays both determine and limit their potential applications. [11][12][13] Thus it is necessary to take into account the mineralogical composition of clay deposits in order to apply acid leaching at an appropriate acid/clay ratio for the preparation of clay products that retain a layered morphology.…”

Tratamento Térmico Da Bentonita Não Interfere Na Capacidade De Adsorção Da Aflatoxina B1

“…Estes dados, associados à perda de massa, podem provavelmente ser atribuídos à desidratação e eliminação de cátions interlamelares (Rossetto et al, 2009). Da mesma forma, também foi possível observar no espectro a diminuição das bandas na região entre 450 e 1000 cm -1 , as quais podem ser atribuídas à ligação entre silício, oxigênio e alumínio.…”