Evolution of micro-deformation in inner-selective thin film composite hollow fiber membranes and its implications for osmotic power generation

Gai, Wenxiao; Xue, Li; Xiong, Jun Ying; Wan, Chunfeng; Chung, Tai‐Shung

doi:10.1016/j.memsci.2016.06.007

Cited by 33 publications

(14 citation statements)

References 43 publications

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“…However, since the size of water molecules is smaller than that of salt molecules, relatively larger volume of water molecules maybe transported to the permeate side than the amount of salt transport as the pressure increases. Similar trend was also observed and has been discussed in previous studies [9,19,54]. Recently, Gai et al reported that membrane prestabilization at a high applied pressure but slightly below their burst pressure for a certain duration is an effective approach to enhance the membranes' PRO performance without damaging the TFC-PRO membranes [9].…”

Section: Effect Of Pre-stabilization On Pa Selective Layersupporting

confidence: 86%

“…6 (b)). This phenomenon may be the result of the following two effects: (1) the increase of membrane effective area attributed by the stretching and thinning of the PA layer, and (2) the reduced water transport resistance due to the decreased membrane thickness, when the hydraulic pressure is applied to the membrane lumen side [9,18,21]. The evaluation of mechanical stability of the hollow fiber membranes showed that addition of 0.1 wt% GO into PES hollow fiber support layer did not undermine the overall mechanical stabilities compared to pure PES support.…”

Section: Morphology and Membrane Stability Evaluation Of Tfc-pro Membranesmentioning

confidence: 99%

“…However, unlike the FO process, PRO is operated at high pressure and hence requires membranes with high mechanical properties that can withstand high hydraulic pressures during the PRO operation [8,9]. Like any other thin film composite (TFC)-based membranes, the PRO membrane support layers are fabricated either as a flat type or hollow fiber configuration via phase separation technique while the thin polyamide (PA) selective layer is formed by interfacial polymerization (IP) method [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thin-film composite hollow fiber membranes incorporated with graphene oxide in polyethersulfone support layers for enhanced osmotic power density

et al. 2019

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This study focused on the development of pressure retarded osmosis (PRO) thin film composite (TFC) membranes for enhanced osmotic power using hollow fiber polyethersulfone (PES) support structure modified by incorporating hydrophilic graphene oxide (GO) nanosheets. The GO loadings in the hollow fiber substrates were varied to improve water flux performances without compromising the mechanical strength. GO embedded (≤0.2 wt%) PES hollow fiber supports revealed noticeable improvements in pure water permeability, improved structural morphologies, as well as the hydrophilicity within the support layer, without deteriorating the mechanical properties. The GO (0.2 wt%)-incorporated TFC-PRO membrane appeared to have an initial PRO flux (without any applied pressure) of 43.74 L m -2 h -1 , lower specific reverse salt flux of 0.04 g L -1 and structural parameter (S) of 522 µm, significantly better than the control membrane. The maximum power density of 14.6 W m -2 was achieved at an operating pressure of 16.5 bar under the condition of DI water and 1 M NaCl as feed and draw solutions, respectively. The results obtained in this study indicate that modification of PRO hollow fiber support layer by incorporating nanoparticles such as GO nanosheet can be a useful tool to improve the PRO performance.

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Section: Effect Of Pre-stabilization On Pa Selective Layersupporting

confidence: 86%

Section: Morphology and Membrane Stability Evaluation Of Tfc-pro Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thin-film composite hollow fiber membranes incorporated with graphene oxide in polyethersulfone support layers for enhanced osmotic power density

et al. 2019

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“…The TFC and the TFN hollow fiber PRO membranes were pre-stabilized prior to osmotic performance evaluation. The pre-stabilization step was performed at a hydraulic pressure slightly below the burst pressure to avoid instant breakage of the polyamide selective layer membranes during PRO operation [32,39]. The hollow fiber membranes in this study were found to burst between 17 and 18 bar, thus the PRO membranes were pre-stabilized at bar under RO mode (selective layer facing the pressurized stream) for min using DI water as feed.…”

Section: Performance Of Membranes For Pro Processmentioning

confidence: 99%

Enhanced water permeability and osmotic power generation with sulfonate-functionalized porous polymer-incorporated thin film nanocomposite membranes

et al. 2020

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In this study, a hydrophobic porous organic polymer (PP) synthesized via Friedel-Crafts alkylation of dichloro-p-xylene, was functionalized with hydrophilic sulfonate functional group to form PP-SO 3 H, prior to incorporation into the polyamide layer of a hollow fiber pressure retarded osmosis (PRO) TFN membrane. Sulfonate functionalization of the PP material improved the compatibility of the nanomaterial with the aqueous amine precursor during the in situ interfacial polymerization, leading to a decrease in aggregation of the nanoparticles. The effect of nanomaterial loading on the membranes' performance was also elucidated. PP-SO 3 H incorporation resulted in significant improvement of surface hydrophilicity, which along with improved porosity, facilitated enhanced water transport across the membrane and maintained an acceptable salt rejection of the selective layer. The best-performing membrane with PP-SO 3 H loading of 0.002 wt. % showed a 46.3 L m -2 h -1 water flux and power density of 14.6 W m -2 , which are both the highest values recorded. This study suggests that the functionality and chemical properties of the nanomaterial in a TFN membrane is essential in improving altogether the osmotic performance and salinity gradient power harvesting capability during PRO.

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“…The membranes showed to have a burst pressure of 27 bar, except for TFN-0.05 and TFN-0.1, which burst at 24 bar. It is suggested that in future studies involving SNW-1-incorporated TFN membranes, pre-stabilization of the membranes at a pressure lower than the burst pressure must be performed prior to PRO operation to enhance the PRO performance of the membranes [69]. Furthermore, these results also indicate that higher loading of the SNW-1 nanomaterial can lead to instability of the membranes when operated for PRO at higher pressures, and 0.02 wt% of SNW-1 is the optimal loading at which the membranes can be operated at 27 bar.…”

Section: Pro Membrane Performancementioning

confidence: 99%

Melamine-based covalent organic framework-incorporated thin film nanocomposite membrane for enhanced osmotic power generation

et al. 2019

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A melamine-based covalent organic framework (COF) nanomaterial, Schiff base network-1 (SNW-1), was incorporated into the polyamide layer of a novel thin film nanocomposite (TFN) pressure retarded osmosis (PRO) membrane. The deposition of SNW-1 was made on an open mesh fabric-reinforced polyamide-imide (PAI) support substrate through interfacial polymerization (IP). SNW-1 loading influence on the water permeability and osmotic power density during PRO operation was investigated. The porous and highly hydrophilic SNW-1 nanomaterial facilitated the flow of water molecules across the membranes, while maintaining satisfactory salt rejection ability of the polyamide selective layer. The membranes exhibited significantly enhanced surface hydrophilicity, water permeability, and power density. The mode of incorporation of SNW-1 during IP was also investigated and it was observed that the secondary amine groups of SNW-1 react with the carbonyl groups of 1,3,5-benzenetricarbonyl trichloride, the acyl halide precursor in polyamide formation; thus, SNW-1 was incorporated through the amine precursor, 1,3-phenylenediamine. Testing with 1.0 M NaCl as the draw solution, the TFN membrane with a loading of 0.02 wt% SNW-1 exhibited the highest water flux of 42.5 Lm -2 h -1 and power density of 12.1 Wm -2 , while withstanding hydraulic pressure over 24 bar. This study suggests that COF-incorporation can be a promising method in PRO membrane fabrication to improve both osmotic performance and energy harvesting capability for the PRO process.

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Evolution of micro-deformation in inner-selective thin film composite hollow fiber membranes and its implications for osmotic power generation

Cited by 33 publications

References 43 publications

Thin-film composite hollow fiber membranes incorporated with graphene oxide in polyethersulfone support layers for enhanced osmotic power density

Thin-film composite hollow fiber membranes incorporated with graphene oxide in polyethersulfone support layers for enhanced osmotic power density

Enhanced water permeability and osmotic power generation with sulfonate-functionalized porous polymer-incorporated thin film nanocomposite membranes

Melamine-based covalent organic framework-incorporated thin film nanocomposite membrane for enhanced osmotic power generation

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