期刊
JOURNAL OF MEMBRANE SCIENCE
卷 581, 期 -, 页码 421-429出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2019.03.047
关键词
Polysiloxane; Mullite; Ceramic membrane; Tape casting; Phase inversion
资金
- Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) through the Brazilian-German Collaborative Research Initiative on Manufacturing (BRAGECRIM) Program
- German Research Foundation (DFG)
- Brazilian National Council for Scientific and Technological Development (CNPq)
Polymethylsiloxane (MK) and aluminum diacetate have been stoichiometrically combined to synthesize a mullite-based powder (3Al(2)O(3)center dot 2SiO(2)) at 850 degrees C (5 h) or 1200 degrees C (3 h). High-purity crystalline mullite ( > 99%) was obtained by heating the mixture in the air (thermal oxidation) at 1200 degrees C for 3 h, mainly due to the formation of highly reactive silica and alumina precursors. Afterward, the mullite-based powders were used to prepare planar asymmetric microfiltration membranes by phase-inversion tape casting. The green membranes were sintered at 1600, 1650 or 1700 degrees C during 2 h. The asymmetric morphology identified in the membranes by scanning electron microscopy analysis reveals a thin skin-layer (microfiltration layer, < 10 mu m) followed by a porous support, in which two different structures were observed: finger- and/or sponge-like layer. Water permeation performance in a dead-end configuration was investigated at different pressures (3, 4, and 5 bar). The obtained results clearly indicated an improved water permeation flux compared to a symmetric commercial membrane (133.6 m(3)/m(2).h compared to 14.7 m(3)/m(2).h, respectively, at 5 bar). This observation could be ascribed to the asymmetric morphology resultant from the phase-inversion process.
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