New Ceramic Microfiltration Membranes from Tunisian Natural Materials: Application for the Cuttlefish Effluents Treatment

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Preparation and Evaluation of Hydrophobic Grafted Ceramic Membrane: For Application in Water Desalination

A new inorganic hydrophobic porous membrane was prepared and applied in desalination with the air-gap membrane distillation process. Ceramic supports from low-cost natural Tunisian sand have been elaborated by the extrusion method. The microfiltration layer has been elaborated from ZrO2 powder by slip casting technical using a solution of water, sand powder, and polyvinyl alcohol solution. The hydrophobic surface of the active layer was elaborated by grafting 1H,1H,2H,2H-perfluorodecyltriethoxysilane on the ceramic microfiltration membrane surface (Tunisian Sand/Zirconia), to prepare a hydrophobic surface. The contact angle method allows showing the hydrophobic nature on the grafted membrane surface since it increases from 25° before grafting to values exceeding 140° after grafting. The efficiency of the grafting process was characterized by scanning electron microscopy (SEM). The membrane permeability varies from 700 l.h−1.m−2 before grafting to 10 l.h−1.m−2 after grafting. The new hydrophobic membrane seems to be promising in the field of membrane distillation. Salt retention higher than 98% was obtained using a modified microfiltration ceramic membrane

Physico-Chemical Study of Coating Formulation Based on Natural Apatite for the Elaboration of Microfiltration Membrane

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

Elaboration de membranes de microfiltration et d'ultrafiltration en céramique à base d'argile tunisienne

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Elaboration and characterization of novel PES/nanocomposites mixed matrix membranes

International audienceIn this study, novel polyethersulfone (PES) membranes were blended for the first time with nano-composites from the system (ZnO-TiO2-SiO2-CeO2). The obtained composite membranes by wetphase inversion method were subsequently characterized and finally used for the filtration of lysozyme solutions. The incorporation of 0.25 wt.% of the ternary (ZnO-TiO2-SiO2) and quaternary (ZnO-TiO2-SiO2-CeO2) nanocomposites increased the membrane permeability of 377% and 329% respectively, compared with pure PES membrane. This could be explained by a drastic reduction of the contact angle values from 76 degrees (pure PES membrane) to 32 degrees (composites membranes). Moreover, the membranes prepared with various nanometric inorganic fillers displayed a lysozyme rejection higher than 96% (99% in the case of M-ZTS-Ce-0.25)

Developing of titania-smectite nanocomposites UF membrane over zeolite based ceramic support

International audienc