Microporous TiO2 membranes with a cut off &lt;500 Da

Puhlfürß, P.; Voigt, Andreas; Weber, Ralph; Morbé, Michael

doi:10.1016/s0376-7388(00)00380-x

Cited by 172 publications

(77 citation statements)

References 8 publications

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“…A strong simplified method for membrane pore size estimation is to calculate the molecular diameter of the dextran with a molecular weight equal to the MWCO of the membrane [42,43].…”

Section: Calculation Of Membrane Pore Sizesmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

Separation and Purification Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. irreversible fouling, is still a critical aspect affecting the operational cost and energy consumption in water treatment plants. In this study, four ceramic membranes with pore sizes or molecular weight cut-off (MWCO) of 0.20 μm, 0.14 μm, 300 kDa and 50 kDa were compared during natural surface water filtration with respect to hydraulically irreversible fouling index (HIFI), foulant composition and narrowing of pore size due to the irreversible fouling. Our results showed that the hydraulically irreversible fouling index (HIFI) was proportional to the membrane pore size (r 2 =0.89) when the same feed water was filtrated. The UF membranes showed lower HIFI values than the MF membranes. Pore narrowing (internal fouling) was found to be a main fouling pattern of the hydraulically irreversible fouling. The internal fouling was caused by monolayer adsorption of foulants with different sizes that is dependent on the size of the membrane pore.

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“…A strong simplified method for membrane pore size estimation is to calculate the molecular diameter of the dextran with a molecular weight equal to the MWCO of the membrane [42,43].…”

Section: Calculation Of Membrane Pore Sizesmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

Separation and Purification Technology

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“…Systems like ZrO 2 and TiO 2 were taken into consideration, in particular with respect to their chemical resistance (Schaep et al 1999;van Gestel et al 2002van Gestel et al , 2003Shojai and Mantyla 2001). Also, γ-Al 2 O 3 and TiO 2 were of main interest (Xu and Anderson 1993;Larbot et al 1994;Wildman et al 1994;Puhlfürß et al 2000). These membranes have high selectivity against small macromolecules.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of alumina, titania, and alumina-titania hydrophobic membranes via sol?gel polymeric route

et al. 2013

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Nanometer TiO 2 -Al 2 O 3 composite membranes were synthesized through the sol-gel polymeric reaction of TiCl 4 and AlCl 3 in the presence of acrylic-acrylamide copolymer as a template. The dried samples were characterized by DTA, TGA, FTIR, XRD, and TEM to determine the thermal behavior, chemical composition, crystal structure, shape, and size of the particles. Octyltrichlorosilane was chosen as a silane coupling agent to increase the hydrophobic nature of the prepared membranes. The morphological structure, hydrophobic nature, water permeability, and desalination efficiency of the prepared membranes were studied by SEM, contact angle, permeability, and NaCl rejection coefficient (R%) measurements. The crystal structure of titania and alumina particles in the composite was affected by the AlCl 3 and TiCl 4 feed ratio. As the titania concentration increased, the average particle size of the composite particles became larger and the uniformity of the membrane layer decreased. The alumina (75%)-titania (25%) composite (AT25) showed a uniform crack-free membrane layer with a pore diameter of 12.9 nm and a porosity of 21.46%, with great hydrophobic nature, and with contact angle reaching 116°. This membrane can withstand calcination temperature up to 700°C, as the alumina and titania were present in their active forms: gamma-alumina and anatase, respectively. The membrane produced from this composite showed a high surface area of 333 m 2 /g with a respective particle size of 4.6 nm. Moreover, it showed a high ability to reject NaCl from water with a rejection coefficient of 73% and a high permeation flux of 4.8 l/h m 2 at 75°C.

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“…For the formation of disk-shaped membranes, a number of researchers used a spin-coating procedure. Puhlfurb, et al (2000) and van Gestel (2003) used both types of sols above for the preparation of titania multilayer membrane. Mesoporous membrane interlayers were prepared by using colloidal sols containing titania particles with a size larger than 10 DID.…”

Section: Membrane Coatingmentioning

confidence: 99%

“…Vacassy, et al (1997) reported a preparation of a zirconia top layer with a thickness of between 50 om and 150 om. Puhlfurb, et al (2000) and van Gestel (2003) obtained titania top layers with a thickness of 50-100 nm. In contrast with the common method for the formation of a microporous toplayer, Vacassy, et al (1997) andJulbe, et al (1992) used a sol doped with PYA or PEG, but the information on their preparation procedure is lacking.…”

Section: Dryingmentioning

confidence: 99%

“…Mg(OC 2Hs h (Vacassy, et al, 1997). Puhlfurb, et al (2000) used an inorganic additive in order to obtain a completely amorphous microporous membrane at 450°C (where the titania membrane material normally shows an anatase structure) but they did not show the kind of dopant used. Kumar (1993) retarded the anatase-rutile transformation of a mesoporous anatase titania membrane at higher than 200°C by adding 7.5 mol% of La.…”

Section: Preparation Of Doped Zirconia and Titania Multilayer Membranesmentioning

confidence: 99%

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Multilayer membranes based on ceramic materials —Sol-gel synthesis, characterization and membrane performance

Qianyao

Chen

2007

Pet. Sci.

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In nearly all chemical and petrochemical systems, separation of products generally accounts for more than 50% of the capital cost and the greatest part of the energy consumption. It is generally believed that membrane systems can offer benefits in both reducing the energy consumption of the separation stages and lowering the capital expenditure (CAPEX). Microporous ceramic membranes have the potential to overcome the limitation in polymer membranes operation, which has been the subject of a large amount of research worldwide in the last two decades. And most of the research has aimed at the production of the asymmetric multilayered membrane based on amorphous oxides by sol-gel techniques. The paper is to give an overview of publications on ceramic membranes, including less common materials of titania, zirconia, which can be used for pervaporation in corrosive media. Commercially available microporous membranes based on these membrane materials and the membrane economics are also summarized.

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Microporous TiO2 membranes with a cut off <500 Da

Cited by 172 publications

References 8 publications

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Synthesis of alumina, titania, and alumina-titania hydrophobic membranes via sol?gel polymeric route

Multilayer membranes based on ceramic materials —Sol-gel synthesis, characterization and membrane performance

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