Institute Europeen des Membranes UMR 5635

Murviel-lès-Montpellier, France

Institute Europeen des Membranes UMR 5635

Murviel-lès-Montpellier, France

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Chang Q.,Jingdezhen Ceramic Institute | Wang Y.,Jingdezhen Ceramic Institute | Cerneaux S.,Institute Europeen des Membranes UMR 5635 | Zhou J.-E.,Jingdezhen Ceramic Institute | And 4 more authors.
Journal of the European Ceramic Society | Year: 2014

To increase the mixing uniformity of coarse alumina grains with a small amount of nano TiO2 particles, TiO2 particles were prepared on the surface of coarse Al2O3 grains by in-situ hydrolysis of TiCl4. The coated coarse Al2O3 powder was used to prepare microfiltration membranes supports. The effects of TiO2 content and sintering temperatures on the bending strength, porosity and pore size distribution of the obtained supports were studied. The results show that the melted nano TiO2 grains locate mainly at the neck of Al2O3 grains, which increases the bending strength of the support by increases the neck area. However, the bending strength is weakened if the TiO2 content is excessive. No aggregated nano TiO2 grainsare found. The resulting supports sintered at 1650°C for 2h yields a bending strength of 55.4MPa, a porosity of 38% with a mean pore size of 8.0μm. © 2014 Elsevier Ltd.


Chang Q.,Jingdezhen Ceramic Institute | Yang Y.,Jingdezhen Ceramic Institute | Zhang X.,Institute Europeen des Membranes UMR 5635 | Wang Y.,Jingdezhen Ceramic Institute | And 7 more authors.
Journal of the European Ceramic Society | Year: 2014

To lower the sintering temperature of Al2O3 microfiltration membrane support, Al2O3 powders with particle size distribution of tri-modal are chosen. The results show that the function of fine Al2O3 grains depends on their agglomeration state: if fine Al2O3 grains distribute discretely, the bending strength of the support increases along with a slight increase in porosity; however, the aggregated fine grains are harmful to both bending strength and pore size distribution of the support. The bridging of medium Al2O3 grains between coarse grains contributes to increase the bending strength, but has less effect on porosity. The addition of medium (and/or fine) Al2O3 powder has less effect on the pore size distribution of the support if only coarse Al2O3 grain forms the support's framework, which suggests a new way to prepare the support with both high bending strength and high porosity at low temperature. © 2014 Elsevier Ltd.


Chang Q.,Jingdezhen Ceramic Institute | Zhou J.-E.,Jingdezhen Ceramic Institute | Wang Y.,Jingdezhen Ceramic Institute | Liang J.,Jingdezhen Ceramic Institute | And 7 more authors.
Journal of Membrane Science | Year: 2014

Hydrophilic modification of the commercial ceramic microfiltration membranes is processed by the nano-TiO2 coating. The nano-coating does not form a separation layer but increases the hydrophilic character of membrane surface. The modified microfiltration membranes are used to treat stable oil-in-water emulsions. The results show that the ceramic membrane modified by 2mol/L Ti(SO4)2 solution is the more suitable in the MF process. Under the following operation conditions: cross-flow velocity of 5m/s, trans-membrane pressure of 0.16MPa, feed temperature of 40°C, the modified membrane has the better stable flux, which is higher than that of the unmodified one. The oil concentration of the filtrate is no more than 10mg/L if the oil concentration of the feed is not higher than 4g/L due to the existence of the hydrophilic nano-TiO2 coating, indicating the modified ceramic microfiltration membrane can be directly applied in the treatment of a stable oil-water emulsion. © 2014 Elsevier B.V.


Li L.,University of Chinese Academy of Sciences | Chen M.,Chinese Institute of Urban Environment | Dong Y.,Chinese Institute of Urban Environment | Dong X.,South China University of Technology | And 6 more authors.
Journal of the European Ceramic Society | Year: 2016

With abundant bauxite mineral as starting material, a low-cost alumina-mullite composite hollow fiber ceramic membrane (HFCM) was fabricated via phase-inversion method followed by high temperature sintering. Process parameters, including bore fluid flow rate and air-gap distance, which affect structure and properties of the HFCM were systematically explored. A low bore fluid flow rate would lead to the deformation of inner walls of the HFCM as a result of insufficient solidification, while a large air-gap distance would induce the distortion of finger-like voids. Effects of sintering on the microstructure, pore size distribution, nitrogen gas flux and mechanical properties were investigated in details. Acid-base titration was first proposed to quantitatively determine concentration of surface active sites of membrane surface after sintering. An increase in sintering temperature leads to significantly enhancing strength but almost linearly reduces concentration of active surface hydroxyl sites. Compared with its alumina counterpart, this low-cost composite membrane can be sintered at lower sintering temperature, and exhibits higher mechanical strength and active surface hydroxyl site concentration. © 2016 Elsevier Ltd.


Chang Q.,Jingdezhen Ceramic Institute | Wang X.,Jingdezhen Ceramic Institute | Wang Y.,Jingdezhen Ceramic Institute | Zhang X.,Jingdezhen Ceramic Institute | And 2 more authors.
Desalination and Water Treatment | Year: 2015

The tubular Al2O3 microfiltration membranes modified with nano-TiO2 coating were applied in the separation of waste oil-in-water emulsion. The separation performances of the MF membranes with and without nano-TiO2 modification were studied under two different operation modes, i.e. the circulation mode and the concentration mode, respectively. The circulation mode in which the oil concentration in feed keeps constant simulates the condition of the great amount of feed to be treated, while the concentration mode in which the oil concentration in feed increases with the extraction of the filtrate simulates the condition of a small amount of feed to be treated. The results show that the operation mode has a less effect on the flux of the MF membranes, but has an important effect on the oil concentration of filtrate for the unmodified membrane. The oil concentration in filtrate under concentration mode is higher than that of circulation mode. For the modified membrane, the operation mode has a less effect on the flux and the oil concentration of filtrate, because the hydrophilic nano-TiO2 coating prevents oil droplets from penetrating the membrane pores. Under both operation modes, the fluxes of the modified membranes are higher than those of the unmodified membranes. © 2015 Balaban Desalination Publications. All rights reserved.


Li L.,Chinese Institute of Urban Environment | Li L.,Chinese Academy of Sciences | Li L.,South China University of Technology | Chen M.,Chinese Institute of Urban Environment | And 16 more authors.
Journal of the European Ceramic Society | Year: 2016

With abundant bauxite mineral as starting material, a low-cost alumina-mullite composite hollow fiber ceramic membrane (HFCM) was fabricated via phase-inversion method followed by high temperature sintering. Process parameters, including bore fluid flow rate and air-gap distance, which affect structure and properties of the HFCM were systematically explored. A low bore fluid flow rate would lead to the deformation of inner walls of the HFCM as a result of insufficient solidification, while a large air-gap distance would induce the distortion of finger-like voids. Effects of sintering on the microstructure, pore size distribution, nitrogen gas flux and mechanical properties were investigated in details. Acid-base titration was first proposed to quantitatively determine concentration of surface active sites of membrane surface after sintering. An increase in sintering temperature leads to significantly enhancing strength but almost linearly reduces concentration of active surface hydroxyl sites. Compared with its alumina counterpart, this low-cost composite membrane can be sintered at lower sintering temperature, and exhibits higher mechanical strength and active surface hydroxyl site concentration. © 2016 Elsevier Ltd.

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