Processing and characterization of TiO2/ZnAl2O4 ultrafiltration membranes deposited on tubular support prepared from Moroccan clay

Seffaj, N.; Younsi, Saad Alami; Persin, M.; Cretin, Marc; Albizane, A.; Larbot, A.

doi:10.1016/j.ceramint.2004.05.001

Cited by 18 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The properties of the ceramic membranes are mainly determined by their composition, the pore-former content and the sintering temperature. The proposed compositions of low-cost ceramic membranes are very wide, depending on the nature of their raw materials: local clays [3][4][5][6][7][8][9][10] and kaolin [11][12][13] , sepiolite 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 2 µm and apparent porosities increased from 23 to 44% as the added amount of starch rose from 0 wt% to 15 wt% [9], whereas in ball clay membranes the apparent porosity increased from 9 to 32% as the added amount of starch augmented from 0 wt% to 35 wt% (no data about pore sizes were published) [10].…”

Section: Introductionmentioning

confidence: 99%

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Lorente-Ayza

Sánchez

Sanz

et al. 2015

Ceramics International

View full text Add to dashboard Cite

The use of starch as pore former is frequent in the fabrication of porous ceramic membranes, since starches are cheap, innocuous and environmentally friendly. A study has been conducted to evaluate the influence of potato starch content (0-30 wt %) and sintering temperature (1100 and 1400ºC) on low-cost ceramic microfiltration membranes. The raw materials were a mixture of kaolin, alumina and starch, from which membrane specimens were shaped by uniaxial dry pressing.The results indicated that the percentage of potato starch did affect the properties of the membrane. Thus, an increase of starch content provoked a reduction of bulk density (an increase of porosity) a rise of water permeability and a substantial modification (coarsening) of the pore size distribution. This effect deals with the role as pore former of starch, which burns out when fired. More interestingly, it was experimentally observed that the effect of starch was particularly effective for starch percentages higher than 10 wt% once a connected coarse pore network is developed. On the other hand, an increase in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 sintering temperature from 1100 to 1400ºC also influenced membranes' characteristics but the effect was much less significant than that of starch content. *Manuscript Click here to view linked ReferencesA percolation analysis based on the Effective Medium Approximation (EMA) contact model allowed to conclude that the critical porosity calculated corresponds to a starch content of 10.2 wt%, which agrees quite well with the estimation from experimental results. Finally, tortuosity was calculated with a simple model derived from Hagen-Poiseuille equation. The obtained data showed that tortuosity factor decreased as the starch content or sintering temperature increased. These findings are consistent with SEM analysis and pore size determination.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Lorente-Ayza

Sánchez

Sanz

et al. 2015

Ceramics International

View full text Add to dashboard Cite

show abstract

“…Numerous materials have been used as pore generators, starting by chemically pure substances (urea 6 ), going through processed substances (corn starch 11 ), and ending in natural products (poppy seeds 2 , rice bran 10 ), or even in wastes (sawdust 8 , fly ash 9,12 ). Starches are broadly employed as materials for generating porosity in ceramics as they produce pores during burning out around 500ºC [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…The addition of a temperature sensitive component in order to create porosity in the support is applied in the manufacture of membranes based on advanced ceramics (alumina, titania, zirconia), and also of membranes based on traditional compositions 8 or local raw materials (clays 9,10 , perlite 11 ). Numerous materials have been used as pore generators, starting by chemically pure substances (urea 6 ), going through processed substances (corn starch 11 ), and ending in natural products (poppy seeds 2 , rice bran 10 ), or even in wastes (sawdust 8 , fly ash 9,12 ).…”

Section: Introductionmentioning

confidence: 99%

Role of starch characteristics in the properties of low-cost ceramic membranes

Lorente-Ayza

Orts

Pérez-Herranz

et al. 2015

Journal of the European Ceramic Society

View full text Add to dashboard Cite

Starch is used as porosity generator in membranes and other porous ceramics. There are different providers that offer a wide variety of starches, which produce distinct pore size distributions. A study was conducted to evaluate the effects of the characteristics of starches (impurities, particle size), obtained from potato, pea, maize and wheat, on the properties of microfiltration membranes formulated with traditional raw materials (the ceramic matrix was composed of quartz, albite and mullite). The results indicated that the pore size distribution and the permeability coefficient of the membrane can be controlled modifying only the particle size of starch. In this way, correlations were obtained between surface mean diameter of starch and membrane properties (characteristic pore diameters d 16 and d 50 , and permeability coefficient). Moreover, it is necessary to use a starch having a mean particle size greater than about 50 microns in order to obtain a significant change in the pore size distribution and an increase in the permeability of the membrane.

show abstract

“…The support used to deposit the ultrafiltration membrane is made of natural moroccan clay, the support preparation was reported in previous papers [15,16]. After preparation of the support, it is dried and sintered at 1250 • C for consolidation, the average pore of the support is 11 m; its porosity is 43% and its average mechanical strength is 10 MPa.…”

Section: Membrane Preparationmentioning

confidence: 99%

“…To prevent the infiltration of the support by the sol used to prepare the ultrafiltration layer, an intermediate layer made of zirconia was coated by slip casting on the clay support using the suspended powder technique according to the method developed in our laboratory [16]. After firing at a temperature of 1100 • C for 2 h, the ZrO 2 microfiltration layer obtained presented a pore diameter of 0.23 m and an average thickness above 23 m.…”

Section: Membrane Preparationmentioning

confidence: 99%

Investigation of performance of a low ZnAl2O4–TiO2 ultrafiltration membrane in relation with speciation and membrane solutes interactions

Loukili¹,

Alami-Younssi²,

Albizane³

et al. 2008

Separation and Purification Technology

View full text Add to dashboard Cite

Processing and characterization of TiO2/ZnAl2O4 ultrafiltration membranes deposited on tubular support prepared from Moroccan clay

Cited by 18 publications

References 14 publications

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Influence of starch content on the properties of low-cost microfiltration ceramic membranes

Role of starch characteristics in the properties of low-cost ceramic membranes

Investigation of performance of a low ZnAl2O4–TiO2 ultrafiltration membrane in relation with speciation and membrane solutes interactions

Contact Info

Product

Resources

About