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In this study, a new ceramic membrane type was used for the filtration of colored water. The membrane was prepared from local Algerian kaolin KT2 of Milia-type. The choice of this raw material was dictated by its natural abundance, to form the macroporous support prepared by the slip casting technique. A functional thin film layer (with a pore size of about 0.2 μm) produced by the sol-gel method was deposited on the support to reduce the porosity. A detailed study was conducted because of the importance of this layer and the improvement which brought to the filtration process. Ceramic membranes were tested for the removal of bromophenol red (BR) under a filtration pressure of 3 bar and a duration of 2 h of treatment. The results revealed a rejection rate of 100% for BR, especially after the addition of the inorganic layer. The material was characterized by DTA, TGA, XRD and SEM. The retention and the permeability of BR were also studied.

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This work focuses on studying the removal of Evans Blue dye, which is a water pollutant, using Cu-Al-CO 3 anionic clay known also as layered double hydroxide (LDH) and its phase calcined at 500 • C (Cu-Al-500). LDH is easy to synthesize by a coprecipitation method at a constant pH; it is non-toxic and non-expensive, constituted of plane sheets containing alternating octahedral stack M(OH) 6 formed by divalent (Cu 2+) and trivalent (Al 3+) cations and carbonate anions (CO 2− 3) in the interfoliar space. The X-ray diffraction (XRD) pattern of the formed solids shows that the synthesized phase is the LDH type, and was confirmed by infrared spectroscopy (FT-IR). Thermogravimetric analysis (TGA) shows that the decarbonation of LDH begins at 500 • C, thus this temperature is chosen for the calcination of this clay. XRD and FT-IR of the calcined phase confirm the obtaining of copper and aluminium oxides. The UV-visible study of the adsorption of Evans Blue is performed by varying different parameters such as the weight of LDH and its calcined phase, the concentration of the dye and the pH of the solution. The obtained isotherms from this kinetic study show that the adsorption of Evans Blue dye is more efficient in the calcined phase compared with the as-synthesized LDH.