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      Preparation and Characterization of Hydrophobic Flat Sheet Membranes Based on a Recycled Polymer

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          In this work, we used a recycled low-density polyethylene (LDPE) in order to prepare flat sheet membranes with different polymer concentrations (5 and 10%). The used chemical method for the membrane's preparation is the phase inversion. After obtaining the membranes, we characterized them by atomic force microscopy (AFM) and scanning electron microscopy (SEM) to study their structure and surface characteristics. Based on the SEM images, our membranes have a dense skin layer. In addition, we observed a decrease in the porosity with the increase in the polymer concentration. When the polymer concentration increases from 5 to 10% the porosity decreases from 35.54% to 20.28%. Furthermore, we remarked significant changes in the contact angle and the surface roughness with the increase of the polymer concentration. The roughness increases from 363 to 577 nm for the same evolution of the polymer concentration. These high values of roughness imply obtaining values of contact angles greater than 90° and hydrophobic membranes, which is beneficial for the membrane distillation. Furthermore, the use of our membranes in vacuum membrane distillation (VMD) experiments showed a permeate flux up to 1.503 kg/hm 2; for the membrane with 35.54% of porosity and 5% of polymer concentration.

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          Membrane distillation

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            Membrane distillation: Recent developments and perspectives

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              Membranes and theoretical modeling of membrane distillation: a review.

              Membrane distillation (MD) is one of the non-isothermal membrane separation processes used in various applications such desalination, environmental/waste cleanup, food, etc. It is known since 1963 and is still being developed at laboratory stage for different purposes and not fully implemented in industry. An abrupt increase in the number of papers on MD membrane engineering (i.e. design, fabrication and testing in MD) is seen since only 6 years ago. The present paper offers a comprehensive MD state-of-the-art review covering a wide range of commercial membranes, MD membrane engineering, their MD performance, transport mechanisms, experimental and theoretical modeling of different MD configurations as well as recent developments in MD. Improved MD membranes with specific morphology, micro- and nano-structures are highly demanded. Membranes with different pore sizes, porosities, thicknesses and materials as well as novel structures are required in order to carry out systematic MD studies for better understanding mass transport in different MD configurations, thereby improving the MD performance and looking for MD industrialization.

                Author and article information

                International Polymer Processing
                Carl Hanser Verlag
                3 July 2019
                : 34
                : 3
                : 376-382
                1 Environmental, Catalysis and Process Analysis Research Unity, National Engineering School of Gabes, University of Gabes, Gabes, Tunisia
                2 Unit of Research UMR CNRS 6144 GEPEA, Angers, France
                Author notes
                [* ] Correspondence address, Mail address: Adel Zrelli, Environmental, Catalysis and Process Analysis Research Unity, National Engineering School of Gabes, University of Gabes, Omar Ibn. ElKhattab St. 6029 Gabes, Tunisia, E-mail: adel.zrelli@ 123456yahoo.fr
                © 2019, Carl Hanser Verlag, Munich
                Page count
                References: 18, Pages: 7
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
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