Development of a new TiO₂ ultrafiltration membrane on flat ceramic support made from natural bentonite and micronized phosphate and applied for dye removal

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• 作者：A. Bouazizi^a ; ^{abdelmjidbouazizi@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; M. Breida^a ; A. Karim^a ; B. Achiou^a ; M. Ouammou^a ; J.I. Calvo^b ; A. Aaddane^a ; K. Khiat^a ; S. Alami Younssi^a
• 关键词：Ceramic membrane ; Moroccan bentonite ; Natural phosphate ; Ultrafiltration ; Direct Red 80
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1479-1487
• 全文大小：1959 K

文摘

A new ultrafiltration (UF) composite membrane was developed during this investigation, based on a ceramic support that ensures high mechanical strength and low resistance to fluid passage. Microfiltration (MF) supports were made by uniaxial pressing of bentonite powder and micronized phosphate. Changes in morphology, shrinkage, porosity and mechanical strength of the moldings were monitored as a function of applied thermal cycles in order to obtain optimal treatment conditions. Optimal conditions of sintered membrane support were of 30% of micronized phosphate at 950 °C leading to a porosity of 34.06% and a good mechanical resistance (14.6 MPa approx.). The resulting support was used to develop a TiO₂ UF membrane by utilizing a spin-coating technique. Visual inspection of the sintered membrane at 800 °C under a scanning electron microscope showed that the deposited layer was homogeneous and free of structural defects. The resulting pore diameters were determined to be approximately 72 nm. Finally resulting UF membranes were tested by the filtration of Direct Red 80 solution.