Abstract
This work deals with the experimental characterization of the rheological properties of a dip solution which will be used to elaborate a new apatite/clay microfiltration membrane by deposition using slip casting process of the active layer on a tubular support based on natural clay previously prepared. So, the rheological study of various coatings with different concentration of apatite powder, polyvinyl alcohol (PVA) and water under different conditions regarding temperature and stirring time was done. It was found that the suitable suspension should follow a rheo- thickner behavior having a viscosity in the range of 30-35 mPa s at room temperature of 25 to 30°C. The optimum conditions then found to achieve these properties were: a suspension of 4% of apatite, 40% of PVA stirred for 180minutes. The study reveals also that the thickness of the active membrane layer depends on the coating time.
Highlights
Commercial ceramic membranes have undergone a rapid growth during the last two decades
This work deals with the experimental characterization of the rheological properties of a dip solution which will be used to elaborate a new apatite/clay microfiltration membrane by deposition using slip casting process of the active layer on a tubular support based on natural clay previously prepared
To obtain a suspension with a viscosity in the range of 25 mPa s and having a rheo-thickner behavior at room temperature of 25 to 30°C, the suspension should have a composition of 4% of apatite and 40% of polyvinyl alcohol (PVA) and stirred for 180 minutes
Summary
Commercial ceramic membranes have undergone a rapid growth during the last two decades. The active layer thickness and microstructure of the membrane are mainly controlled by the viscosity of the dip solution which depends mainly on the particle size, the nature of the raw material, the addition of polymer and on temperature [6,7,8,9]. Specific apatite properties such as chemical resistance, hydration, and viscosity make it a valuable material to use as coating powder in membrane preparation for a wide range of applications [10, 11]. Apatite is known in the phosphate mines as the principal constituent of the ore while in the biological environment the principal component of animal bones and APMFC (Apaptite Microfiltration Coating)
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