Preparation of ceramic γ-Al2O3–TiO2 nanofiltration membranes for desalination
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Mohsen Khalili
und
Mohammad Mahdi Zerafat
Abstract
As one of the most recently developed membrane separation processes, nanofiltration (NF) has found a number of industrial applications. Ceramic NF membranes are also regarded as the appropriate choice in many applications, due to their higher chemical and physical stability. In this study, the rejection of the chloride ion is investigated using bi-layered γ-Al2O3-TiO2 NF membranes based on α-alumina supports. Compression is used in preparation of the supports and sol-gel dip-coating for the top-layer formation. SEM micrographs, XRD, and nitrogen adsorption/desorption isotherms are used for membrane characterisation. The results show that the calcination temperature (600◦C) results in different crystal structures including the brookite phase of TiO2, the γ phase of Al2O3, and a combined phase of aluminium-titanium oxides. The average pore size of the membrane was identified as 1.6 nm using an adsorption/desorption isotherm. The rejection was also studied for the chloride ion, using a cross-flow filtration module. Filtration tests were carried out under different pressures, pH values, and salt concentrations; these showed a smoother behaviour particularly around the isoelectric points (IEPs) due to the dual-layer structure, with the best rejection at pH of approximately 5.
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© 2015 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Selection and design of ionic liquids as solvents in extractive distillation and extraction processes
- Analytical procedure for steroid profiling valid for Athlete Biological Passport
- Fabrication of paper-based analytical device by silanisation of filter cellulose using alkyltrimethoxysilane coupled with UV radiation
- Synthesis, characterisation and photocatalytic activity of Ag+- and Sn2+-substituted KSbTeO6
- Dysprosium pertraction through facilitated supported liquid membrane using D2EHPA as carrier
- Volatile compounds composition and antioxidant activity of bee pollen collected in Lithuania
- Self-penetrating and interpenetrating 3D metal–organic frameworks constructed from 4-(4-carboxyphenoxy)-phthalic acid and N-donor auxiliary ligands
- Preparation of ceramic γ-Al2O3–TiO2 nanofiltration membranes for desalination
- Promoting effect of group VI metals on Ni/MgO for catalytic growth of carbon nanotubes by ethylene chemical vapour deposition
- Microwave-assisted solvent-free synthesis and luminescence properties of 2-substituted-4,5-di(2-furyl)-1H-imidazoles
- Synthesis of potential inhibitors of glycosyltransferases representing UDP-GlcNAc
- Development of transition state analogue inhibitors for N-acetylglycosyltransferases bearing D-psicoor D-tagatofuranose scaffolds
- Efavirenz–eudragit E-100 nanoparticle-loaded aerosol foam for sustained release: in-vitro and ex-vivo evaluation
- Photochromic and molecular switching behaviour of Schiff base-containing pyrazolone ring
- Improvements to CO2 headspace biodegradability test
- Synthesis of corn rootworm pheromones from commercial diols
