Membrane characterization by microscopic methods: Multiscale structure

Wyart, Y.; Georges, Gaëlle; Deumié, Carole; Amra, Claude; Moulin, Philippe

doi:10.1016/j.memsci.2008.02.010

Cited by 64 publications

(18 citation statements)

References 61 publications

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“…It is possible to adjust the mean plane of the surface by the subtraction of the surfaces to correct the imperfections of the chosen scan size. It is then possible to extract the roughness parameters, including the porosity of the membrane, which is directly related to the fouling . A membrane with a hydrophilic surface interacts strongly with a hydrophilic probe, as indicated by a large phase shift, whereas the hydrophobic surface gives only a small phase shift .…”

Section: Analytical Techniques For Studying Foulingmentioning

confidence: 99%

Fouling control on microfiltration/ultrafiltration membranes: Effects of morphology, hydrophilicity, and charge

Kumar

Ismail

2015

J of Applied Polymer Sci

189

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Membrane‐based separation processes are very susceptible to flux decline because of concentration polarization and fouling problems. Despite the immense applications of low‐pressure driven microfiltration (MF) and ultrafiltration (UF) membranes in various fields, fouling is considered a major negative aspect, and it renders the membrane with a reduced lifetime. The important membrane properties, hydrophilicity, charge, and morphology mainly gained by the membrane during its formation process are considered to be deciding factors in fouling. In this review, we spotlight the effects of the hydrophilicity, charge, and morphology on MF and UF fouling, the principles of the most frequently used instrumentation techniques in predicting these factors, and measures that can be taken for fouling control. The review also focuses on the UF and MF membrane modification techniques used to attain high antifouling characteristics. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42042.

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Section: Analytical Techniques For Studying Foulingmentioning

confidence: 99%

Fouling control on microfiltration/ultrafiltration membranes: Effects of morphology, hydrophilicity, and charge

Kumar

Ismail

2015

J of Applied Polymer Sci

189

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“…AFM is one of the surface probe microscope techniques in which a precision tip interacts with the sample and the forces acting between them are measured. AFM produces micrograph images of the membrane surface and provides useful information about pore size distribution (MF/UF), surface roughness (NF/RO), surface forces, electrical properties and interactions between membrane and foulant (Wyart et al, 2008;Hilal et al, 2003;Arkhangelsky et al, 2007b;Mitrouli et al, 2010). Surface smoothness is an important factor affecting membrane fouling; a smooth surface is comparatively resistant to membrane fouling.…”

Section: Morphological Characteristicsmentioning

confidence: 99%

Degradation of polymeric membranes in water and wastewater treatment

Antony

Leslie

2011

Advanced Membrane Science and Technology for Sustainable Energy and Environmental Applications

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“…The main parameters studied include membrane structure parameters (surface roughness, porosity, size and shape of pores and pore size distribution) and membrane/effluent coupling parameters (membrane material, hydrophobicity and surface charge, etc.) [45]. Differences in fouling behaviour between Al 2 O 3 and TiO 2 membranes observed in this study may be largely attributed to their different pore size, surface roughness, surface chemistry and microstructure.…”

Section: Membrane Filtration Water Treatmentmentioning

confidence: 66%

Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes

Zhu

Kennedy

et al. 2011

Journal of Membrane Science

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Water recycling via treatment from industrial and/or municipal waste sources is one of the key strategies for resolving water shortages worldwide. Polymer membranes are effective at improving the water quality essential for recycling, but depend on regular cleaning and replacement. Pure ceramic membranes can reduce the cleaning need and last significantly longer in the same applications whilst possessing the possibility of operating in more aggressive environments not suitable for polymers. In the current work, filtration using a tubular ceramic membrane (α-Al 2 O 3 or TiO 2 ) was combined with ozonation to remove organic compounds present in a secondary effluent to enhance key quality features of the water (colour and total organic carbon, TOC) for its potential reuse.'Bare' commercial α-Al 2 O 3 filters (pore size ~0.58 µm) were tested as a microfiltration membrane and compared with the more advanced catalytically active TiO 2 layer that was formed by the sol-gel method. The presence of anatase with a 4 nm pore size at the membrane surface was confirmed by Xray diffraction (XRD) and N 2 adsorption. Filtration of the effluent over a 2 hour period led to a reduction in flux to 45% and 60% of the initial values for the α-alumina and TiO 2 membrane, respectively. However, a brief dose (2 mins) of ozone at the start of the run resulted in reductions to only 70% of the initial flux for both membranes. It is likely that the oxide's functional property Interestingly, the porous structure therefore acted in a synergistic, dual function mode to physically separate the particulates whilst also catalytically breaking down organic matter. The system also greatly improved the efficiency of membrane filtration for the reduction of colour, A 254 (organics absorption at the wavelength of 254 nm) and TOC. The best performance came from combined ozonation (2 min ozonation time with an estimated applied ozone dose of 8 mg L -1 ) with the TiO 2 membrane, which was able to reduce colour by 88%, A 254 by 75% and TOC by 43%. It is clearly evident that a synergistic effect occurs with the process combination of ozonation and ceramic membrane filtration demonstrating the practical benefit of combining ceramic membrane filtration with conventional water ozonation.

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Membrane characterization by microscopic methods: Multiscale structure

Cited by 64 publications

References 61 publications

Fouling control on microfiltration/ultrafiltration membranes: Effects of morphology, hydrophilicity, and charge

Fouling control on microfiltration/ultrafiltration membranes: Effects of morphology, hydrophilicity, and charge

Degradation of polymeric membranes in water and wastewater treatment

Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes

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