Enhancing selectivity of novel outer-selective hollow fiber forward osmosis membrane by polymer nanostructures

Sanahuja-Embuena, Victoria; Lim, Sang-Hyun; Górecki, Radoslaw Pawel; Trzaskuś, Krzysztof; Hélix-Nielsen, Claus; Shon, Ho Kyong

doi:10.1016/j.cej.2021.133634

Cited by 7 publications

(4 citation statements)

References 64 publications

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“…Urea flux would be by diffusive concentration gradient across the membrane. Although urea rejection ratios are well known for RO and have also been measured in water extracted from waste streams to partially regenerate dialysate using FO membrane, [33,34] the diffusive flux of urea across osmotic membranes measured in FO mode has not been reported in the literature. Diffusive flux will have to be sufficient to remove ≈15 g urea per day in practical sized membranes for portable dialysis.…”

Section: Resultsmentioning

confidence: 99%

Dialysate Regeneration with Urea Selective Membrane Coupled to Photoelectrochemical Oxidation System

Shao

Tang

Ren

et al. 2022

Adv Materials Inter

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Portable dialysis can meaningfully improve the health outcomes and life quality of end‐stage renal disease (ESRD) patients and reduce the economic burdens of dialysis related care. Current treatment sessions use 120 Kg of aqueous dialysate, thus key to realizing portability is the continuous regeneration of small volumes of spent dialysate. Urea is the single most abundant uremic waste. However, its removal is compromised from the interference of other uremic species. Osmotic membranes demonstrate high selectivity of urea over other uremic species in both reverse and forward osmosis (FO) modes. In FO mode, a urea mass transport coefficient of 1.2 µm s−1 is seen, corresponding to a diffusion coefficient of 1.2 × 10−9 cm2 s−1. By using a second stage dialyzer with a commercially available FO cartridge, daily urea removal rate of over 30 g, twice the daily generation rate, could be achieved at a dialysate flow rate of 400 mL min−1. Combined with an optimized urea photodecomposition device, selective removal of urea (0.32 mg cm−2 h−1) and excessive water (0.081 g cm−2 h−1) are achieved simultaneously thus scaling to 2000 cm2 electrode area for clinical needs of 15 g urea removal/day. No significant difference in the cytotoxicity between treated and untreated human spent dialysate is observed.

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Section: Resultsmentioning

confidence: 99%

Dialysate Regeneration with Urea Selective Membrane Coupled to Photoelectrochemical Oxidation System

Shao

Tang

Ren

et al. 2022

Adv Materials Inter

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“…Aquaporins are another promising material that can be introduced into the active layer of hollow fiber membrane for enhancing separation performance, chemical resistance, and anti-fouling properties [ 322 ]. Sanahuja-Embuena et al synthesized a Pluronic nanocomposite hollow fiber membrane by adding aquaporin into the active layer of the membrane in an osmotic membrane bioreactor [ 323 ]. The resultant membrane was rendered with synergistic effects in decreasing reverse solute diffusion from 0.36 gL −1 to 0.12 gL −1 without compromising the water flux.…”

Section: Applications Of Hollow Fiber Membranesmentioning

confidence: 99%

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

Lau

Soh

et al. 2022

Membranes

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The aggravation of environmental problems such as water scarcity and air pollution has called upon the need for a sustainable solution globally. Membrane technology, owing to its simplicity, sustainability, and cost-effectiveness, has emerged as one of the favorable technologies for water and air purification. Among all of the membrane configurations, hollow fiber membranes hold promise due to their outstanding packing density and ease of module assembly. Herein, this review systematically outlines the fundamentals of hollow fiber membranes, which comprise the structural analyses and phase inversion mechanism. Furthermore, illustrations of the latest advances in the fabrication of organic, inorganic, and composite hollow fiber membranes are presented. Key findings on the utilization of hollow fiber membranes in microfiltration (MF), nanofiltration (NF), reverse osmosis (RO), forward osmosis (FO), pervaporation, gas and vapor separation, membrane distillation, and membrane contactor are also reported. Moreover, the applications in nuclear waste treatment and biomedical fields such as hemodialysis and drug delivery are emphasized. Subsequently, the emerging R&D areas, precisely on green fabrication and modification techniques as well as sustainable materials for hollow fiber membranes, are highlighted. Last but not least, this review offers invigorating perspectives on the future directions for the design of next-generation hollow fiber membranes for various applications. As such, the comprehensive and critical insights gained in this review are anticipated to provide a new research doorway to stimulate the future development and optimization of hollow fiber membranes.

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“…Lakshminarayanaiah and White [38] conducted experiments on water flow through solid polymeric and nonaqueous liquid membranes and found that the process of water transport through a rigid membrane physically differs from that through a liquid membrane. In the case of the solid membranes, e.g., an hollow fiber polyamide membrane [39], water flow is driven by the osmotic force from pure water to the saline water compartment and the pathway depends on the porous membrane properties, such as pore radius, permeability, and surface electrical behavior. In the case of organic liquid membranes, water diffusion is described as the motion of a species by means of kinetic jumps into neighboring vacancies, where the water pathway cannot be defined because of the kinetic motion of all molecules.…”

Section: Introductionmentioning

confidence: 99%

A quantitative study of salinity effect on water diffusion in n-alkane phases: From pore-scale experiments to molecular dynamic simulation

Yan

Chang

Hassanizadeh

et al. 2022

Fuel

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Enhancing selectivity of novel outer-selective hollow fiber forward osmosis membrane by polymer nanostructures

Cited by 7 publications

References 64 publications

Dialysate Regeneration with Urea Selective Membrane Coupled to Photoelectrochemical Oxidation System

Dialysate Regeneration with Urea Selective Membrane Coupled to Photoelectrochemical Oxidation System

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

A quantitative study of salinity effect on water diffusion in n-alkane phases: From pore-scale experiments to molecular dynamic simulation

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