Newly developed nanofiltration (NF) composite membranes by interfacial polymerization for Safranin O and Aniline blue removal

Shao, Lu; Cheng, Xi Quan; Liu, Yang; Quan, Shuai; Ma, Jun; Zhao, Shu Zhen; Chung, Tai‐Shung

doi:10.1016/j.memsci.2012.12.005

Cited by 163 publications

(57 citation statements)

References 51 publications

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“…The MWCOs of PES-TA, PES-TA-PEGDGE, and PES-TA-PEGDGE-PEI membranes are $ 3074, 925, and 594 g mol À 1 , respectively. From the relationship between the molecular weight of PEG and their Stokes radius shown in Table 2 [27], the mean pore size of PES-TA, PES-TA-PEGDGE, and PES-TA-PEGDGE-PEI membranes are determined as $ 1.46, 0.75, and 0.59 nm, respectively. These results illustrate that the modification process narrowed the pores, effectively changing the membrane from an "open pore" to a "tight pore" NF membrane.…”

Section: Membrane Preparation and Characterizationmentioning

confidence: 99%

Green fabrication of a positively charged nanofiltration membrane by grafting poly(ethylene imine) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups

Zhu

Zhang

Zheng

et al. 2016

Journal of Membrane Science

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a b s t r a c tA green method to prepare asymmetric positively charged poly(arylene ether sulfone) nanofiltration (NF) membranes was explored by grafting water-soluble poly (ethylene imine) (PEI) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups (PES-TA) and cross-linking with poly(ethylene glycol) diglycidyl ether (PEGDGE). The modifications were shown to increase the positive charge and decrease the pore size of the PES-TA substrate. The optimized NF membrane displayed a pure water flux of 15.5 L m À 2 h À 1 . Membrane rejection NaCl, MgCl 2 , and methyl violet (MV) (at a constant pressure of 4 bar) were measured to be 46.2%, 94.9%, and 99.8%, respectively. Moreover, the membrane maintained excellent chlorine resistance during 100 h of exposure to chlorine. Thus, the membrane shows potential for water desalination and purification applications.

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Section: Membrane Preparation and Characterizationmentioning

confidence: 99%

Green fabrication of a positively charged nanofiltration membrane by grafting poly(ethylene imine) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups

Zhu

Zhang

Zheng

et al. 2016

Journal of Membrane Science

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“…In this process, membrane substrates are contacted with an aqueous amine solution such as m-phenylenediamine (MPD) solution and then an acid chloride solution such as trimesoyl chloride (TMC) in alkane solution so that a thin dense layer can be synthesized at the interface between the two phases. By changing the reaction conditions, interfacial polymerization can create membranes with high permeability and salt rejection [20][21][22][23][24][25]. Thus, it has been widely adopted in commercialized membranes, most of which are in flat sheet configurations.…”

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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“…The additional characteristic peaks for amine groups at 1573 cm´1, 1473 cm´1 and 1315 cm´1 also indicate the same result. Appearance of other strong peaks at 1658 cm´1 and 1091 cm´1 in the spectra of STPH could be ascribed to the C=O double bond and C-O single bond in the carboxyl groups [20]. Thus, the above results show that STPH has been successfully synthesized.…”

Section: Draw Solution Synthesis and Structure Characterizationmentioning

confidence: 60%

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

Long

Wang

2015

Energies

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Abstract:Osmotic energy, as a sustainable energy source with little environmental impact, has drawn much attention in both academia and industry in recent years. Osmotically driven membrane processes can harvest the osmotic energy and thus have great potential to produce sustainable clean water or electric energy. The draw solution, as an osmotic component, has been more and more explored by scientists in recent years in order to achieve a high osmotic pressure and suitable molecular size. In this work, a novel draw solute-sodium tetraethylenepentamine heptaacetate (STPH)-is synthesized and identified by nuclear magnetic resonance spectroscopy ( 1 H-NMR) and Fourier transform infrared (FTIR). Its solution properties are optimized in terms of the solution pH and concentration, and related to the forward osmosis (FO) performance. A water flux of 28.57 LMH and a low solute flux of 0.45 gMH can be generated with 0.5 g/mL STPH draw solution and de-ionized water (DI water) as the feed solution under pressure retarded osmosis (PRO) mode, which is superior to the FO performance with many other draw solutes reported. Further FO desalination test shows a stable water flux of 9.7 LMH with 0.3 g/mL STPH draw solution and 0.6 M NaCl feed solution. In addition, the draw solution recovery is also investigated.

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Newly developed nanofiltration (NF) composite membranes by interfacial polymerization for Safranin O and Aniline blue removal

Cited by 163 publications

References 51 publications

Green fabrication of a positively charged nanofiltration membrane by grafting poly(ethylene imine) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups

Green fabrication of a positively charged nanofiltration membrane by grafting poly(ethylene imine) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups

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

Sodium Tetraethylenepentamine Heptaacetate as Novel Draw Solute for Forward Osmosis—Synthesis, Application and Recovery

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