Removal of hazardous volatile organic compounds from water by vacuum pervaporation with hydrophobic ceramic membranes

Kujawa, Joanna; Cerneaux, Sophie; Kujawski, Wojciech

doi:10.1016/j.memsci.2014.08.054

Cited by 128 publications

(79 citation statements)

References 46 publications

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“…Recently, Kujawa et al prepared hydrophobic alumina and titania membranes by grafting C 6 F 13 C 2 H 4 Si(OEt) 3 (C6) molecules onto the membrane surface. A hydrophobic titania membrane treated with a C6 solution for 35 h showed separation factors of 30 and 91 for ethyl acetate (EA) and methyl tert-butyl ether (MTBE) from water (organic content: 1% mass fraction), respectively [18]. Kujawa et al concluded that the higher selectivity for MTBE compared with EA was related to the smaller distance between the Hansen solubility parameters (HSPs) of C6 and MTBE than that between C6 and EA while both fluxes are similar (MTBE flux: 1.0 kg m À 2 h À 1 , EA flux: 1.1 kg m À 2 h À 1 ).…”

Section: Introductionmentioning

confidence: 99%

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Araki

Gondo

Imasaka

et al. 2016

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Araki

Gondo

Imasaka

et al. 2016

Journal of Membrane Science

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“…Thus, it is of great importance to eliminate or recover VOCs from wastewaters. Many methods including air stripping, adsorption, distillation, advance oxidation, biological treatment, and membrane technology have been proposed to remove VOCs from water, and the pros and cons of these methods have been discussed previously . Pervaporation was regarded as an attractive separation technique for this application with obvious advantages of high efficiency, energy‐saving, and eco‐friendly…”

Section: Introductionmentioning

confidence: 99%

High‐performance PDMS membranes for pervaporative removal of VOCs from water: The role of alkyl grafting

Zhou

Chen

et al. 2016

J of Applied Polymer Sci

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To improve the pervaporation performance of PDMS membrane, alkyl groups with different chain length were grafted into PDMS matrix. The prepared membranes were characterized by ATR-IR, DSC, TGA, PALS, and tensile testing. The effects of alkyl grafting on pervaporation performance of PDMS membrane were investigated in separation of ethyl acetate/water mixture. Experimental results show that the separation factor of PDMS membrane is largely improved by alkyl grafting because of the enhanced preferential sorption of ethyl acetate, and this improvement depends on alkyl grafting ratio and alkyl chain length. The total flux of PDMS membrane reduces after alkyl grafting owing to the decreased free volume. When grafting ratio is above 6.9%, membrane grafted with shorter alkyl groups is preferred for pervaporation. The best pervaporation performance is achieved by 9% octyl grafted PDMS membranes with a separation factor of 592 and a total flux of 188 gm 22 h 21 in separation of 1% ethyl acetate/water mixture at 40 8C. Moreover, this octyl grafted PDMS membrane also exhibits excellent separation performance in removal of butyl acetate, methyl-tert-butyl ether, and n-butanol from water.

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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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Removal of hazardous volatile organic compounds from water by vacuum pervaporation with hydrophobic ceramic membranes

Cited by 128 publications

References 46 publications

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

High‐performance PDMS membranes for pervaporative removal of VOCs from water: The role of alkyl grafting

Hydrophobic Ceramic Membranes for Water Desalination

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