Polyelectrolyte membranes prepared by dynamic self-assembly of poly (4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA) for nanofiltration (I)

Deng, Huiyu; Xu, Yuan; Zhu, Bao‐Ku; Wei, Xiuzhen; Liu, Fu; Cui, Zhenyu

doi:10.1016/j.memsci.2008.06.028

Cited by 74 publications

(31 citation statements)

References 42 publications

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“…5(c) and (d), it is difficult to distinguish a film on the top of the support membrane after depositing one CS layer. The similar phenomena were observed during the LbL assembly [19,31]. In comparison with Fig.…”

Section: Membrane Micrographsupporting

confidence: 86%

One-step dynamic assembly of polyelectrolyte complex membranes

Zhang¹,

Gao²,

Ji³

et al. 2009

Materials Science and Engineering: C

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a b s t r a c t a r t i c l e i n f oDuring the past decades, layer-by-layer (LbL) assembly technique based on electrostatic adsorption of oppositely charged polyelectrolytes (PEs) has been one of the most frequently utilized processes for assembling ultra-thin film. However, LbL process is also recognized as a time-consuming process, especially for assembly of dense membranes. In this paper, a one-step dynamic assembly based on electrostatic adsorption was developed to prepare the PE complex membranes. The chitosan (CS), used as a model polycation, was dynamically deposited on a hydrolyzed polyacrylonitrile (PAN) support membrane with negative charges under a selected pressure to form a PE complex membrane for pervaporation separation of water-ethanol mixture. Compared with traditional dip-coating method, this new assembly process could offer some advantages such as the formation of selective layer with dilute solution, easily used for different membrane module types and suitable for large scale applications. The assembly conditions such as dynamic pressure, CS molecular weight, and CS concentration were investigated. The appropriate conditions for assembly were: dynamic pressure, 0.2 MPa; CS molecular weight, 82,000; and CS concentration, 0.5 wt.%. In the case of pervaporation of 95 wt.% ethanol/water mixtures, the separation factor and the permeate flux of the CS polyelectrolyte complex membranes were 422 and 230 g/(m 2 h) (60°C), respectively. The cross-linking treatment with glutaraldehyde and sulfuric acid were subsequently performed. It was found that the separation performance was improved by the cross-linking treatment. Finally, inner skin hollow fiber PE complex membranes were also successfully explored using one-step dynamic assembly for pervaporation dehydration. The proposed process will offer a new approach to obtain a relatively integrated PE complex membrane.

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Section: Membrane Micrographsupporting

confidence: 86%

One-step dynamic assembly of polyelectrolyte complex membranes

Zhang¹,

Gao²,

Ji³

et al. 2009

Materials Science and Engineering: C

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“…6(d) and (f)), which was beneficial for the improvement of selectivity. The similar phenomena were observed for the cross-section of dynamic layer-by-layer assembled polyelectrolyte multilayer membranes [38,39]. Fig.…”

Section: Sem Afm and Contact Angle Analysessupporting

confidence: 82%

Dynamically formed inner skin hollow fiber polydimethylsiloxane/polysulfone composite membrane for alcohol permselective pervaporation

Guo

Zhang

et al. 2010

Chemical Engineering Journal

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“…In this study, the GO/f-Cs thin layer possessing the negative charged GO and cationic chitosanium was more hydrophilic than the unmodified membrane and it favored the sorption of water molecules. The use of the diluted GO/f-Cs solution enabled the macromolecules to be well dispersed and stretched, in order to form a loose thin layer of GO laminates imbedded in Cs [7,57]. The surface modification with GO/f-Cs improved the hydrophilicity of the membranes, at the same time, the coated layer on the membrane surface can cause slight flux reduction due to the increased thickness of the membrane.…”

Section: Salt Rejection and Water Flux Of Membranesmentioning

confidence: 99%