Preparation and characterization of ZnO microfiltration membrane and its support using kaolin (DD3) and CaCO3

Abstract

The objective of the present paper was to prepare a ceramic support with membrane. Tubular ceramic supports prepared from kaolin (DD3) and calcium carbonate with 6 and 10 mm inner and outer diameters, respectively, were extruded and sintered at 1200 °C. It has been found that sintered supports had interesting characteristics: average pore size of about 5 μm, porosity of about 50%, and monomodal pore size distribution. This support was used to be substrate for a membrane layer of microfiltration. This membrane layer was elaborated from zinc oxide, using slip casting technique. The specimens were subsequently sintered at 1000 °C. The microstructure and porosity as well as the permeability have also been studied. It has been found that the average pore size was about 1.2 μm, the layer thickness was ~33 μm, and the water permeability measured was about 880 L.h -1 .m -2 .bar -1 .

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

“…This later exhibits characteristic endothermic peaks, appearing at 95 and 474 °C and exothermic peaks at 997 °C where this reaction may be attributed to mullite nucleation [47]. For the calcium carbonate, TGA and DSC analysis showed that there is only endothermic peak (mass loss of 43.73%) in the range of 650 to 800 °C, which may be due to the thermal decomposition of CaCO 3 into calcium oxide (CaO) and CO 2 [48].…”

Characterization and application of ceramic membranes prepared from Algerian kaolin

“…The analysis of the powder showed the main crystalline phases present in kaolin KT2 and confirmed that its structure was essentially formed by a mixture of two crystalline phases identified as kaolinite and quartz. These crystalline phases were expected in such a type of kaolin [34,35]. The quantity of other crystalline phases (estimated from the height of the peaks) was in trace amounts, as in the case of free muscovite, which has also been detected [35].…”

“…3). This later exhibits characteristic endothermic peaks, appearing at 85 and 474 °C due to combustion and decomposition of the material [34,38]. Thermal treatment: the transformations during the sintering treatment have a direct influence on the development of the formed phases [39][40][41][42] as well as on the liquid phase [39,43,44] likely to form at high temperatures, which is the origin of the recrystallization and secondary mullite formation.…”