Polyacrylonitrile supported thin film composite hollow fiber membranes for forward osmosis

Ren, Jian; McCutcheon, Jeffrey R.

doi:10.1016/j.desal.2015.05.018

Cited by 65 publications

(33 citation statements)

References 50 publications

(90 reference statements)

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“…Since most TFC 5 layers are made from interfacial polymerization of MPD and TMC, removing excess solution after the MPD coating is the major obstacle in the process [21]. Vacuum assist interfacial polymerization or wipe drying are required to make a defect free polyamide layer [16,30].…”

Section: Introductionmentioning

confidence: 99%

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Gao

Sun

Zhu

et al. 2016

Journal of Membrane Science

116

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Outer-selective thin-film composite (TFC) hollow fiber membranes are normally made from interfacial polymerization of m-phenylenediamine (MPD) and trimesoyl chloride (TMC).However, the removal of excess MPD solution and the large consumption of alkane solvents are their technical bottlenecks. In this study, green methods to prepare the outer selective TFC hollow fiber membranes were explored by firstly modifying the membrane substrate with polyethyleneimine (PEI) and then by water soluble small molecules such as glutaraldehyde (GA) and epichlorohydrin (ECH). Using P84 polyimide as the substrate, not only do these modifications decrease substrate's pore size, but also vary surface charge by making the membranes less positively charged. As a result, the resultant membranes have higher rejections against salts such as Na 2 SO 4 , NaCl and MgSO 4 . The PEI and then GA modified membrane has the best separation performance with a NaCl rejection over 90 % and a pure water permeability (PWP) of 1.74 ± 0.01 Lm −2 bar −1 h −1 . It also shows an impressive rejection to CdCl 2 (94 %) during long-term stability tests. The CdCl 2 rejection remains higher than 90% at operating temperatures from 5 to 60 °C. This study may provide useful insights for green manufacturing of outer-selective nanofiltration (NF) hollow fiber membranes.

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Section: Introductionmentioning

confidence: 99%

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Gao

Sun

Zhu

et al. 2016

Journal of Membrane Science

116

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“…A completely different picture is observed in the cross section of C membrane, which has a thicker carrier layer (∼1.5 m) with asymmetric pores, perpendicular to the surface, which are often reported in the literature [13,51].…”

Section: Transport Properties and Porementioning

confidence: 68%

Preparation and Properties of Composite PAN/PANI Membranes

Fryczkowska

Piprek

Sieradzka

et al. 2017

International Journal of Polymer Science

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The methods of modifying PAN membranes have been known and used for many years. An interesting solution seems to be to give the sensory properties to this type of membranes. This paper presents the results of research on the method of obtaining PAN/PANI membranes using phase inversion method from a solution in DMF, following two methods: (1) dissolving both polymers (PAN and PANI) and then coagulating in water or in an aqueous solution of CSA and (2) forming the membranes from polyacrylonitrile solution and coagulation in water, followed by coating of CSA with a solution of TFE. The membranes obtained as a result of the experiment were tested for physical and chemical properties, transport properties, surface morphology, degree of dispersion of composite components, and sensitivity to the presence of dilute acids and bases. FTIR microspectroscopy and scanning electron microscopy were used to study the surface morphology. The sensory properties of membranes that are inherently colored were determined visually and by UV-Vis spectrophotometry. Furthermore, when choosing the method of membrane forming, we can obtain membranes with good physical and chemical and transport properties or ones characterized by high sensitivity to the pH of the solution.

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“…2 Contrary to RO process, FO uses osmotic gradient pressure as driving force resulting in low membrane fouling and energy consumption. [5][6][7][8][9] Cellulose acetate (CA) and CTA are the most widely used FO material for their good resistance to chlorine and hydrophilicity. 4 They are FO membrane, draw solute, ICP, reverse solute diffusion and membrane fouling.…”

Section: Introductionmentioning

confidence: 99%

“…Many materials could be used as FO membranes such as polyamide (PA), polysulfone (PSF), polyethersulfone (PES), polyacrylonitrile (PAN), cellulose, and so on. [5][6][7][8][9] Cellulose acetate (CA) and CTA are the most widely used FO material for their good resistance to chlorine and hydrophilicity. [10][11][12] Up to now, HTI is the exclusive manufacturer of commercial FO membrane material.…”

Section: Introductionmentioning

confidence: 99%

Interforce initiated by magnetic nanoparticles for reducing internal concentration polarization in CTA forward osmosis membrane

Chi

Zhang

Guo

et al. 2017

J of Applied Polymer Sci

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The interforce between the magnetic composite forward osmosis (FO) membranes and the magnetic draw solution was proposed to reduce the internal concentration polarization (ICP) of FO process, and realized the synergetic permeability improvement of resultant FO membranes. The key factor was the successful fabrication of the Fe 3 O 4 magnetic nanoparticles (MNPs) with small-size and narrow distribution via co-precipitation method. The cellulose triacetate (CTA) magnetic composite FO membranes were fabricated using Fe 3 O 4 as additive via in situ interfacial polymerization, and named CTA-Fe 3 O 4 . Dynamic light scattering (DLS) and zeta results showed that the coated sodium oleate on the MNPs explained their reducing aggregation and the stability of various pHs. The MNPs' surface segregation during demixing process resulted in the improvement of hydrophilicity, Fe content and roughness of resultant CTA-Fe 3 O 4 composite FO membranes. Furthermore, the in situ interfacial polymerization resulted in the formation of the polyamide selective layer, and the CTA-Fe 3 O 4 membrane's N content was 11.02% to 11.12%. The permeability properties (FO and pressure retarded osmosis modules) were characterized using 1.0M NaCl and 100 mg/L Fe 3 O 4 as draw solutions, respectively. The results indicated that the higher concentration of MNPs supplied more interforce and better FO permeability properties. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44852.

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Polyacrylonitrile supported thin film composite hollow fiber membranes for forward osmosis

Cited by 65 publications

References 50 publications

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Green modification of outer selective P84 nanofiltration (NF) hollow fiber membranes for cadmium removal

Preparation and Properties of Composite PAN/PANI Membranes

Interforce initiated by magnetic nanoparticles for reducing internal concentration polarization in CTA forward osmosis membrane

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