Pervaporation properties of fluoroalkylsilane (FAS) grafted ceramic membranes

Kujawski, Wojciech; Krajewska, S.; Kujawski, M.; Gazagnes, Laetitia; Larbot, A.; Persin, M.

doi:10.1016/j.desal.2006.04.042

Cited by 76 publications

(49 citation statements)

References 27 publications

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“…Larbot and others [1][2][3][4][5] [15,16] performed the most extensive studies on the ceramic membrane modification. ZrO 2 and c-Al 2 O 3 membranes have been modified by various alkyl siloxanes: C 6 F 13 C 2 H 4 Si(OMe) 3 , C 8 F 17 C 2 H 4 Si(OEt) 3 , Me 2 Si(OEt) 2 , MeSi(OEt) 3 , and Me 2 Si(OEt) 2 [15,17], where OMe and OEt denotes methoxy and ethoxy groups, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, they are ideal for many applications in the chemical and pharmaceutical industry, as well as in water and wastewater processing [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The modification has led to an effective hydrophobization of the ceramic surface. The modified membranes were examined in pervaporation of various water-organic liquid mixtures [2] as well as in membrane distillation (MD) process for seawater desalination [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

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Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes

Kujawa¹,

Kujawski²,

Koter³

et al. 2013

Desalination and Water Treatment

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A B S T R A C TThe tubular and planar TiO 2 ceramic membranes were modified by grafting with perfluoroalkylsilanes (PFAS) molecules. Two types of PFAS were used for grafting process: 1H,1H,2H,2H-perfluorooctyltriethoxysilane (C6) and 1H,1H,2H,2H-perfluorotetradecyltriethoxysilane (C12). Studies showed that hydrophilic surface of titania ceramic membranes can be efficiently modified as a results of the proposed grafting method. Grafting efficiency of the tubular membranes was determined by measurement of liquid water entry pressure (LEP w ), whereas grafting efficiency of planar membranes was verified by contact angle measurement. The contact angle values of the planar membranes are 130 and 140˚for grafting with C6 and C12, respectively. The LEP w of the tubular membranes increased from 2 bar to 10 bar after modification by C12, whereas the LEP w values were constant at 2 bar when TiO 2 membrane was modified by C6 molecules. It was found that water contact angle, LEP w , and water flux in the membrane distillation (MD) process essentially depend on the time of grafting and the type of PFAS used. Retention coefficients for both membranes are very high, close to unity. The results were additionally analyzed using chemometric simplex method, this resulted in determining the optimum time of grafting. For the membrane grafted by C6, the optimum time according to simplex method was equal to 26 h (flux 4055 [g h À1 m À2 ]), whereas for a membrane grafted by C12 was 17 h (flux 4535 [g h À1 m À2 ]). The highest fluxes of permeate in MD were observed for the optimum times of grafting.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, they are ideal for many applications in the chemical and pharmaceutical industry, as well as in water and wastewater processing [1,2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes

Kujawa¹,

Kujawski²,

Koter³

et al. 2013

Desalination and Water Treatment

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“…Another limitation of ceramic membrane is that they have high membrane thickness, which increases the membrane resistance and thereby making it not a suitable candidate for the MD process [19]. The surface of the ceramic membrane needs to be modified by grafting with a suitable polymer to impart hydrophobicity [20]. To impart hydrophobic characteristics on the hydrophilic ceramic substrates, the metal oxide substrates are modified by various hydrophobic polymers, as reported in literature [4,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Development of hydrophobic clay–alumina based capillary membrane for desalination of brine by membrane distillation

Das

Sondhi

Majumdar

et al. 2016

Journal of Asian Ceramic Societies

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a b s t r a c tClay-alumina compositions of 0, 20, 40 and 55 weight percent (wt%) clay and rest alumina were maintained in porous support preparation by extrusion followed by sintering at 1300 • C for 2.5 h to obtain 3 mm/2 mm (outer diameter/inner diameter) capillary. 1H,1H,2H,2H-perfluorodecyltriethoxysilane (97%) (C8) was used to modify the capillary surface of all compositions without any intermediate membrane layer to impart hydrophobic characteristics and compared in terms of contact angle produced by the capillaries with water and liquid entry pressure (LEP w ). FTIR analysis showed that the hydrophilic surface of the capillary membranes was efficiently modified by the proposed grafting method. Capillary with 55 wt% clay produced a pore size of 1.43 micron and was considered as an ideal candidate for grafting with C8 polymer to impart surface hydrophobicity. The contact angle and LEP w value obtained for this modified membrane (C-55-M) were 145 • and 1 bar, respectively. The modified capillary membrane was applied for desalination of brine by air gap membrane distillation (AGMD) at a feed pressure of 0.85 bar. Maximum flux obtained for C-55-M membrane was 98.66 L/m 2 day at a temperature difference of 60 • C with salt rejection of 99.96%. Mass transfer coefficient of C-55-M was 16 × 10 −3 mm/s at feed temperature of 70 • C.

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“…For that particular reason, the modification of membrane surface is required to change the surface character from hydrophilic to hydrophobic one. Considering the high effectiveness of the grafting process of ceramic materials and good performance in membrane-based separation techniques (e.g., vacuum pervaporation [42,43,54,55], vacuum membrane distillation [56], air-gap and direct membrane distillation [42,45], and organic solvent nanofiltration [47,48,57]) it should be pointed out that such modification also possessed disadvantages. Namely, a significant drawback is the presence of fluorine atoms in coupling agents.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Ceramic Membranes for Water Desalination

et al. 2017

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Hydrophilic ceramic membranes (tubular and planar) made of TiO 2 and Al 2 O 3 were efficiently modified with non-fluorinated hydrophobic grafting molecules. As a result of condensation reaction between hydroxyl groups on the membrane and reactive groups of modifiers, the hydrophobic surfaces were obtained. Ceramic materials were chemically modified using three various non-fluorinated grafting agents. In the present work, the influence of grafting time and type of grafting molecule on the modification efficiency was evaluated. The changes of physicochemical properties of obtained hydrophobic surfaces were determined by measuring the contact angle (CA), roughness (RMS), and surface free energy (SFE). The modified surfaces were characterized by contact angle in the range of 111-132 • . Moreover, hydrophobic tubular membranes were utilized in air-gap membrane distillation to desalination of sodium chloride aqueous solutions. The observed permeate fluxes were in the range of 0.7-4.8 kg·m −2 ·h −1 for tests with pure water. The values of permeate fluxes for membranes in contact with NaCl solutions were smaller, within the range of 0.4-2.8 kg·m −2 ·h −1 . The retention of NaCl in AGMD process using hydrophobized ceramic membranes was close to unity for all investigated membranes.

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Pervaporation properties of fluoroalkylsilane (FAS) grafted ceramic membranes

Cited by 76 publications

References 27 publications

Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes

Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes

Development of hydrophobic clay–alumina based capillary membrane for desalination of brine by membrane distillation

Hydrophobic Ceramic Membranes for Water Desalination

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Pervaporation properties of fluoroalkylsilane (FAS) grafted ceramic membranes

Cited by 76 publications

References 27 publications

Membrane distillation properties of TiO2ceramic membranes modified by perfluoroalkylsilanes

Membrane distillation properties of TiO2ceramic membranes modified by perfluoroalkylsilanes

Development of hydrophobic clay–alumina based capillary membrane for desalination of brine by membrane distillation

Hydrophobic Ceramic Membranes for Water Desalination

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Product

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Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes

Membrane distillation properties of TiO₂ceramic membranes modified by perfluoroalkylsilanes