Development of hollow fiber membranes with alumina and waste of quartzite

Abstract

The development of ceramic membranes with different geometries and compositions extends the possibilities of industrial applications, inducing advantages in terms of increased permeability, membrane area by volume module and chemical, thermal and mechanical resistance. The use of low-cost raw materials is a trend that has grown in scientific research. The aim of this work is to prepare membranes with hollow fiber geometry from alumina and residue of quartzite, by the technique of immersion precipitation in distilled water from a mixture of ceramic mass with a solution of polyethersulfone and, synthesized in temperatures of 1100 ºC to 1500 °C. The hollow fiber membranes were characterized by chemical analysis, X-ray diffraction, particle size distribution, scanning electron microscopy, apparent porosity, flexural strength and permeated water flow by the membranes. The results indicated that the sintering temperature has direct influence on the formation of the mullite phase, and the properties of apparent porosity and permeate flow. The higher the sintering temperature (1400-1500 ° C) increase the formation of the mullite phase, the lower the porosity, as well as the lower the permeate water flow in the membranes. However, there was increase in flexural strength in the hollow fiber membranes with high temperature.

Silicon carbide hollow fiber membranes developed for the textile industry wastewater treatment

“…The peaks referring to α-silicon carbide phase (34°, 36°, 38° and 42°) identified by the JCPDS 73-1663 file [32,33], cristobalite phase of silicon oxide (22°, 28° and 31°) identified by the JCPDS 39-1425 file, and α-alumina phase (35° and 43°) identified by the JCPDS 77-1123 file were observed. These crystalline phases were also observed in other studies [25,27,34]. It is possible to observe that with the increase in sintering temperature, an amount of cristobalite was formed, due to the reaction of SiC with oxygen in the air.…”

“…Khalid et al [40] prepared hollow silicon carbide fiber membranes and showed flexural strength of up to 45 MPa, for a sintering temperature of 1500 °C. Oliveira et al [45] prepared hollow fiber alumina/quartzite residue membranes with a flexural strength between 20 and 82 MPa. Hubadillah et al [46] prepared supports of kaolin hollow fiber membrane with strength values between 4 and 15 MPa and Li et al [47] produced hollow fiber membranes of pure alumina with flexural strength values ranging from 14.4±1.1 to 38.1±3.5 MPa sintered at 1500 and 1600 °C, respectively.…”

“…Inadequate disposal of these effluents affects air, water, soil, and quality of life in general. Membrane technology shows itself as an alternative to minimizing these environmental impacts, since they have affordable cost, low energy expenditure, and high efficiency, compared to conventional processes [23][24][25][26]. Silicon carbide membranes are present in several separation processes and, at the same time, have high selectivity and permeability due to their excellent properties.…”

Influence of Particle Size on the Structure and Properties of 316L Hollow Fiber Membranes Sintered Under Argon Atmosphere

“…The finger-like structure occurs from inner surface, the sponge-like structures are located at the outer region of the cross-section [20]. The finger-like voids were formed due to fast exchange between solvent (NMP) and no-solvent (water) while sponge-like structure was formed due to slow exchange during the spinning process [17].…”

“…It affects extrusion performance of the mixture directly. Particle size also affects green strength, thus enhancing densification and properties of the sintered products [17]. Therefore, 316L parts with high densities present improved mechanical properties [18].…”