Thin-film composite forward osmosis membranes with novel hydrophilic supports for desalination

Han, Gang; Chung, Tai‐Shung; Toriida, Masahiro; Tamai, Shoji

doi:10.1016/j.memsci.2012.09.005

Cited by 234 publications

(144 citation statements)

References 64 publications

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“…In the conventional interfacial polymerization, MPD diffuses from the substrate pores, reacts with TMC at the interface of the two phases and results in a rough ridge-valley morphology [21,22,55]. In this study, amine groups are grafted and fixed on the membrane surface after the PEI cross-linking and then react with GA, ECH or TMC which diffuses from its aqueous or organic phase to the membrane surface.…”

Section: Influence Of Different Modifications On the Performance Of Tmentioning

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

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117

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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: Influence Of Different Modifications On the Performance Of Tmentioning

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

Self Cite

117

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“…Han et al [61] has highlighted role of physicochemical properties of the substrates. By using a sponge type hydrophilic sulphonated polyether ketone (SPEK) support structure in the fabrication of TFC flat-sheet FO membrane, water flux of 50 LMH and 35 LMH was achieved using DI as the feed and 2 M NaCl as the DS for AL-DS and AL-FS membrane orientation respectively.…”

Section: Effect Of Membrane Orientation On Fo Performancementioning

confidence: 99%

Influence of the process parameters on hollow fiber-forward osmosis membrane performances

Majeed

Phuntsho

Sahebi

et al. 2015

Desalination and Water Treatment

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Continued efforts are made in improving the performance of the low-cost forward osmosis (FO) membrane process which utilizes naturally available osmotic pressure of the draw solution (DS) as the driving force. Selection of a suitable DS and development of a better performing membrane remained the main research focus. In this study, the performance of a hollow fiber forward osmosis (HFFO) membrane was evaluated with respect to various operating conditions such as different cross-flow directions, membrane orientation, solution properties, and solution flow rates (Reynolds number). The study observed that operating parameters significantly affect the performance of the FO process. FO comparatively showed better performance at counter-current orientation. NaCl, KCl, and NH 4 Cl were evaluated as DS carrying common anion. Properties of the anionic part of the DS were found important for flux outcome, whereas reverse solute flux (RSF) was largely influenced by the properties of DS cationic part. FO was operated at different DS and feed solution (FS) flow rates and FO outcome was assessed for varying DS and FS Reynolds number ratio. FO showed better flux outcome as Re ratio for DS and FS decreases and vice versa. Results indicated that by adjusting FO processes conditions, HFFO membrane could achieve significantly lower specific RSF and higher water flux outcome. It was observed that using 2 M NaCl as DS and deionized water as FS, HFFO successfully delivered flux of 62.9 LMH which is significantly high compared to many FO membranes reported in the literature under the active layer-DS membrane orientation mode.

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“…A sponge like support structure may in fact give rise to a higher water flux than a finger like structure provided that hydrophilicity and thickness are well controlled. [72][73][74] This illustrates the complexity behind ICP where many specific physico-chemical factors give rise to a phenomenological effect.…”

Section: Remarksmentioning

confidence: 91%

Forward Osmosis in Wastewater Treatment Processes

Korenak¹,

Basu²,

Balakrishnan³

et al. 2017

ACSi

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In recent years, membrane technology has been widely used in wastewater treatment and water purification. Membrane technology is simple to operate and produces very high quality water for human consumption and industrial purposes. One of the promising technologies for water and wastewater treatment is the application of forward osmosis. Essentially, forward osmosis is a process in which water is driven through a semipermeable membrane from a feed solution to a draw solution due to the osmotic pressure gradient across the membrane. The immediate advantage over existing pressure driven membrane technologies is that the forward osmosis process per se eliminates the need for operation with high hydraulic pressure and forward osmosis has low fouling tendency. Hence, it provides an opportunity for saving energy and membrane replacement cost. However, there are many limitations that still need to be addressed. Here we briefly review some of the applications within water purification and new developments in forward osmosis membrane fabrication.

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Thin-film composite forward osmosis membranes with novel hydrophilic supports for desalination

Cited by 234 publications

References 64 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

Influence of the process parameters on hollow fiber-forward osmosis membrane performances

Forward Osmosis in Wastewater Treatment Processes

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