High performance polydimethylsiloxane pervaporative membranes with hyperbranched polysiloxane as a crosslinker for separation of n-butanol from water

Bai, Yunxiang; Dong, Liangliang; Lin, Jianhao; Zhu, Yanting; Zhang, Chunfang; Gu, Junjie; Sun, Yan; Xu, Yuan

doi:10.1039/c5ra06886j

Cited by 19 publications

(9 citation statements)

References 44 publications

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“…PVDF is an ideal candidate for use as a polymeric support in TFC membranes, because of its excellent thermal and chemical stability. PVDF has been used as the support material for pervaporation membranes with active layers of PDMS [49,[51][52][53], PDMS/ZIF-7 [22], silica-filled PTMSP [54] and PEBA/Zn(BDC)(TED) 0.5 [23]. PVDF substrates have been utilised for TFC membranes not only in flat-sheet form, but also in hollow fibre form [55].…”

Section: Introductionmentioning

confidence: 99%

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

Gao

Alberto

Gorgojo

et al. 2017

Journal of Membrane Science

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Membranes that enable the recovery of organic compounds from dilute aqueous solution are desired for applications such as biobutanol production. The polymer of intrinsic microporosity PIM-1 shows promise for organophilic separations and here it is incorporated into thin film composite (TFC) membranes in order to increase the flux of permeate. Asymmetric polyvinylidene fluoride (PVDF) supports were prepared with pore sizes at the surface in the size range 25-55 nm and fractional surface porosities in the range 0.38-0.69, as determined by atomic force microscopy (AFM). The addition of phosphoric acid to the PVDF dope solution helped to control the pore size and porosity. Supports were coated with PIM-1 to form TFC membranes with active layer thicknesses in the range 1.0-2.9 m. Membranes were tested for the pervaporation of a 1-butanol/water mixture (5 wt.%). At 65 C, values of total flux up to 9 kg m-2 h-1 were obtained, with separation factors up to 18.5 and values of pervaporation separation index (PSI) up to 112 kg m 2 h 1 .

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Section: Introductionmentioning

confidence: 99%

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

Gao

Alberto

Gorgojo

et al. 2017

Journal of Membrane Science

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“…PDMS is the most widely used polymeric membrane material for solvent enrichment/recovery from dilute aqueous solution. Herein, the performance of recently reported polymer-based membranes for butanol/water separation are summarized in Figure b and Table S4. − In addition, the performance of several inorganic membranes also listed in Table S4. , Due to the ultrathin and sturdy PDMS layer from the MAS strategy in this work, the PDMS/CHNs/PAN composite membranes show an excellent flux, which is 2–20 times higher than that of reported PDMS membranes, and a comparable separation factor. On basis of the as-prepared high-flux PDMS UTFC membranes, other well-developed approaches such as incorporating porous nanofillers can be adopted to further optimize the membrane microstructure and improve the separation performance.…”

Section: Resultsmentioning

confidence: 85%

Ultrathin Membranes with a Polymer/Nanofiber Interpenetrated Structure for High-Efficiency Liquid Separations

Chen

Liu

et al. 2019

ACS Appl. Mater. Interfaces

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Ultrathin-film composite membranes comprising an ultrathin polymeric active layer have been extensively explored in gas separation applications benefiting from their extraordinary permeation flux for high-throughput separation. However, the practical realization of an ultrathin active layer in liquid separations is still impeded by the trade-off effect between the membrane thickness (permeation flux) and structural stability (separation factor). Herein, we report a general multiple and alternate spin-coating strategy, collaborating with the interface-decoration layer of copper hydroxide nanofibers (CHNs), to obtain ultrathin and robust polymer-based membranes for high-performance liquid separations. The structural stability arises from the poly(dimethylsiloxane) (PDMS)/CHN interpenetrated structure, which confers the synergistic effect between PDMS and CHNs to concurrently resist PDMS swelling and avoid CHNs from collapsing, while the ultrathin thickness is enabled by the sub-10 nm pore size of the CHN layer, the rapid cross-linking reaction during spin-coating, and the small thickness of the CHN layer. As a result, the as-prepared membrane possesses an exceptional butanol/water separation performance with a flux of 6.18 kg/(m 2 h) and a separation factor of 31, far exceeding the state-of-the-art polymer membranes. The strategy delineated in this work provides a straightforward method for the design of ultrathin and structurally stable polymer membranes, holding great potential for the practical application of high-efficiency separations.

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“…The swelling also depended on the macromolecular architecture. A swelling of 10 wt % was reported by Bai et al for an hyperbranched PDMS membrane in an aqueous solution containing 2 wt % of butanol at 40 °C . Therefore, even if the comparison of PDMS membranes obtained in different conditions is not straightforward, the maximum swelling (22 wt %) obtained with the best grafted multiblock copolymer membrane is in the high range for butanol separation.…”

Section: Resultsmentioning

confidence: 91%

“…A swelling of 10 wt % was reported by Bai et al for an hyperbranched PDMS membrane in an aqueous solution containing 2 wt % of butanol at 40°C. 76 Therefore, even if the comparison of PDMS membranes obtained in different conditions is not straightforward, the maximum swelling (22 wt %) obtained with the best grafted multiblock copolymer membrane is in the high range for butanol separation. Furthermore, the influence of the temperature difference between 30 and 50°C (used for PV experiments) on sorption properties can be neglected because the activities of butanol and water do not change significantly in this temperature range according to the NRTL model used for activity coefficient estimation (constant activity of 0.995 for water and activity decrease from 0.309 to 0.245 for butanol).…”

Section: Resultsmentioning

confidence: 97%

Multiblock Copolymer Grafting for Butanol Biofuel Recovery by a Sustainable Membrane Process

Kumar

Arnal-Hérault

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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Biobutanol is an attractive renewable biofuel mainly obtained by the acetone-butanol-ethanol (ABE) fermentation process. Nevertheless, the alcohol concentration has to be limited to a maximum of 2 wt % in ABE fermentation broths to avoid butanol toxicity to the microorganisms. The pervaporation (PV) membrane process is a key sustainable technology for butanol recovery in these challenging conditions. In this work, the grafting of azido-polydimethylsiloxane (PDMS-N3) onto a PDMS-based multiblock copolymer containing alkyne side groups led to a series of original membrane materials with increasing PDMS contents from 50 to 71 wt %. Their membrane properties were assessed for butanol recovery by pervaporation from a model aqueous solution containing 2 wt % of n-butanol at 50 °C. The membrane flux J50μm for a reference thickness of 50 μm strongly increased from 84 to 192 g/h m(2) with increasing PDMS content for free-standing dense membranes with thicknesses in the range of 38-95 μm. At the same time, the intrinsic butanol permeability increased from 1.47 to 4.68 kg μm/h m(2) kPa and the permeate butanol content was also strongly improved from 38 to 53 wt %, corresponding to high and very high membrane separation factors of 30 and 55, respectively. Therefore, the new grafted copolymer materials strongly overcame the common permeability/selectivity trade-off for butanol recovery by a sustainable membrane process.

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High performance polydimethylsiloxane pervaporative membranes with hyperbranched polysiloxane as a crosslinker for separation of n-butanol from water

Cited by 19 publications

References 44 publications

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

Ultrathin Membranes with a Polymer/Nanofiber Interpenetrated Structure for High-Efficiency Liquid Separations

Multiblock Copolymer Grafting for Butanol Biofuel Recovery by a Sustainable Membrane Process

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