Composite membrane of niobium(V) oxide and cellulose acetate: Preparation and characterization

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1006/jcis.1997.5051· OSTI ID:556746

Campos, E A; Gushikem, Y ^[1]

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1. Unicamp, Campinas, Sao Paulo (Brazil). Inst. de Quimica

Composite membranes of niobium(V) oxide and cellulose acetate (Cel/Nb{sub 2}O{sub 5}) were prepared with the following Nb{sub 2}O{sub 5} loadings (in wt%): 1.1, 6.1, 9.8, 15.6, and 20.9. The thermal stability of the membranes slightly decreased in relation to the pure membrane on incorporation of the metal oxide into the matrix. Scanning electron microscopy and niobium mapping with an X-ray EDS microprobe showed that the metal oxide particles are homogeneously dispersed in the matrix. The electronic absorption bands indicated that the oxide particle size varies from that of the monomer to those of oligomer species on increased Nb{sub 2}O{sub 5} loading in the matrix. The dispersed oxide possesses mainly Lewis acid character, a clear indication that on increasing the oxide loading in the matrix, the coordination number of the metal is not saturated by formation of the Nb-O-Nb bond. These materials can be useful in ion-exchange process, as supports for enzymes, in catalytic reactions, and in reverse osmosis experiments.

• OSTI ID: 556746
• Journal Information: Journal of Colloid and Interface Science, Vol. 193, Issue 1; Other Information: PBD: 1 Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
MEMBRANES
SEPARATION PROCESSES
FABRICATION
NIOBIUM OXIDES
ACETATES
CELLULOSE
COMPOSITE MATERIALS
ION EXCHANGE MATERIALS
CATALYST SUPPORTS