A B S T R A C TThe present paper is devoted to synthesis of porous ceramic support from local Moroccan clay (region of Agadir). This material has been dictated by their natural abundance (low price) and their beneficial properties. In this work, we were also interested in the development and the characterization of new mineral support for microfiltration and ultrafiltration membrane. The support, with flat configuration, was prepared from natural clay: the powder was crushed, sieved to 125 lm and mixed with organic additives and water. The obtained paste was then extruded to elaborate a porous structure. The firing temperature of the support is 800 C. After firing, the elaborated support showed an average pore diameter of 11 lm and a porosity of 41%. The average support permeability determined using pure distilled water is 1,805 L/h m² bar. This porous ceramic tube was used as support to prepare microfiltration membrane which were tested for the filtration.
Abstract. This paper is devoted the preparation of low cost microfiltration membranes using Moroccan clay powder. The preparation of membrane was composed with two steps: First a macroporous tubular support with a pore diameter 10 µm and porosity 43%. Secondly a microfiltration layer was performed by the slip casting method. A deflocculated slip was obtained by mixing mineral powder of ZrO2, PVA (polyvinyl alcohol) and water, after drying at room temperature for 24 h, the microfiltration layer was heated to 800°C for consolidation. Scanning electron microscopy observation showed homogeneous layers without cracks with an average pore diameter of 0.19 µm for the active layer. Water permeability obtained is about 841 L/h.m2.bar. The membranes have been tested to cleaning of colored wastewater.
This paper is devoted to study the feasibility of combining photocatalytic degradation with membrane filtration for the removal of organic pollutants. As a result, we have successfully prepared lowcost microfiltration membranes based on clay and phosphate. It is expected that the phosphate and clay composite membrane can have multifunctional separation and photocatalysis simultaneously and this type of composite membrane can play an important role in the photocatalytic reaction in presence of TiO2 and the separation process. We then tested the efficiency of the direct coupling of photodegradation and filtration to determine the rate of release of TiO 2 particles through the microfiltration membrane. However, we have seen that the recovery of TiO 2 exceeds a 96%, as well as the removal of products from the photodecomposition of the reaction mixture in the membrane photocatalytic reactor. In our case the methylene blue elimination rate exceeds 75%.
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