Abstract
Spinel hollow fiber membranes were succoessfully prepared by the phase inversion and sintering technique using mixtures of dolomite and alumina as powder precursors. Different mass proportions of dolomite to alumina were evaluated, as well as different sintering temperatures. According to XRD analyses, spinel was formed when dolomite and alumina mixtures were sintered at temperatures higher than 1100 °C. Spinel hollow fiber membranes which were produced with 25 wt% of dolomite into alumina and sintered at 1350 °C presented an asymmetric pore size distribution with pore sizes varying from 0.16 to 5.29 μm and porosity of 43%. Dolomite additions at proportions greater than 25 wt% produced symmetric hollow fiber membranes due to the relative large particle size of raw dolomite. Spinel hollow fibers sintered at 1350 °C presented mechanical resistance of 54.88 ± 4.25 MPa, which represents an increase of 49% if compared to the mechanical resistance of pure alumina hollow fibers sintered at the same temperature. However, this increase in mechanical resistance was associated to a decrease in membrane permeability. The spinel hollow fiber membrane sintered at 1350 °C was successfully applied for oily wastewater treatment, with oil rejection of 94.5%.
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