Publication: Preparation of SnO2 supported membranes with ultrafine pores
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Coadvisor
Graduate program
Undergraduate course
Journal Title
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Publisher
Elsevier B.V.
Type
Article
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Abstract
The colloidal route of the sol-gel process was used to prepare supported SnO2 membranes. The influence of the sol and monoelectrolyte concentrations on the formation of the gel layer by sol-casting on the top of macroporous alpha-Al2O3 support was described. The stability of the colloidal suspension as a function of the concentrations was analyzed from creep-recovery measurements. The calcined supported membranes were characterized by nitrogen adsorption-desorption isotherms and scanning electron microscopy. The set of results show that homogeneous membrane layers containing the smallest quantity of cracks are formed in a critical interval of sol (1.01 less than or equal to[SnO2]less than or equal to 1.4 M) and electrolyte (2.O less than or equal to[Cl-]less than or equal to 4.0 mM) concentrations. The samples prepared from concentrated suspensions present a lot of interconnected cracks which favors the peeling of the coated layer. The membranes have pores of average diameter of about 1 nm.
Description
Keywords
membrane preparation and structure, ceramic membranes, microporous and porous membranes
Language
English
Citation
Journal of Membrane Science. Amsterdam: Elsevier B.V., v. 127, n. 1, p. 77-86, 1997.
