Enhancing the permselectivity of thin-film composite poly(vinyl alcohol) (PVA) nanofiltration membrane by incorporating poly(sodium-p-styrene-sulfonate) (PSSNa)

Liu, Meihong; Zhou, Choumou; Dong, Bingyan; Wu, Zhefeng; Wang, Lizhong; Yu, Shuili; Gao, Congjie

doi:10.1016/j.memsci.2014.03.051

Cited by 92 publications

(20 citation statements)

References 35 publications

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“…Accordingly, in this study, unlike the method of incorporation polyelectrolyte into the PVA matrix to prepare composite NF membranes [28][29][30][31][32][33], the approach of sequential deposition of PVA and CMCNa on polysulfone ultrafiltration support membrane was adopted to prepare the composite NF membrane. Glutaraldehyde (GA) cross-linking was performed after each deposition to improve the stability and enhance the size exclusion effect of the deposited active layers.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Modification of polysulfone ultrafiltration membrane by sequential deposition of cross-linked poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) for nanofiltration

Zhang

Lü

et al. 2015

Desalination and Water Treatment

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2015): Modification of polysulfone ultrafiltration membrane by sequential deposition of cross-linked poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) for nanofiltration, Desalination and Water Treatment, A B S T R A C TThis study focused on the modification of flat-sheet polysulfone ultrafiltration membranes for nanofiltration (NF) through sequential deposition of poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) with glutaraldehyde cross-linking after each deposition. The contents of PVA and CMCNa in the coating solutions were varied to optimize the membrane performance and the modified membranes were characterized in terms of surface and permeation properties. It was found that the membrane surface became denser, more hydrophilic, and negatively charged at neutral pH after modification and the modified membrane possessed the NF separation characteristic. Under 5.0 bar, the optimized modified membrane exhibited a high-pure water flux of 89.5 l/m 2 h and rejections of 37.8 and 93.8% to 500 mg/l NaCl and Na 2 SO 4 aqueous solution, respectively. The modified membrane could also efficiently remove anionic dyes from aqueous solution, showing retentions of 99.7 and 99.5% to methyl blue and congo red, respectively, under neutral pH and 5.0 bar. Additionally, the modified membrane possessed good chlorine stability, and acid and alkaline resistances. The technique developed is potentially applicable for the fabrication of high-flux negatively charged NF membranes for partial desalination and anionic dye removal.

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Section: Desalination and Water Treatmentmentioning

confidence: 99%

Modification of polysulfone ultrafiltration membrane by sequential deposition of cross-linked poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) for nanofiltration

Zhang

Lü

et al. 2015

Desalination and Water Treatment

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“…The content of PVA-OH groups is decreased accordingly, which is disadvantageous for DD application. For introducing ion-exchange groups into the membrane, PVA can be mixed with polyelectrolyte such as poly(sodium-p-styrene-sulfonate) (PSSS) or poly(styrene sulfonic acid) (PSSH) [15,16]. Nevertheless, PSSS or PSSH is strongly water soluble due to the highly hydrophilic -SO 3 Na or -SO 3 H groups.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the membrane is highly swelled in aqueous solution and cannot be directly used for water treatment. For suppressing the swelling behavior, aldehyde, acid, or dibromoethane cross-linking has to be conducted afterward [15][16][17], and the obtained membrane can be used as one layer for bipolar membranes, or as nanofiltration, fuel cell membranes. However, the PVA-OH groups are partly consumed during the cross-linking process.…”

Section: Introductionmentioning

confidence: 99%

PVA–PSSS membranes for alkali recovery through diffusion dialysis: effect of alkoxysilanes

Liu

Xue

et al. 2015

Desalination and Water Treatment

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A B S T R A C TPoly(sodium-p-styrene-sulfonate) (PSSS) is synthesized by the method of ARGET ATRP, then mixed with polyvinyl alcohol (PVA), and cross-linked with different alkoxysilanes, that is, tetraethoxysilane (TEOS), 3-aminopropyltriethoxysilane (APTS), or γ-glycidoxypropyltrimethoxysilane (GPTS). The obtained flexible cation-exchange membranes have water uptakes (W R ) of 46.8-120.7% and ion-exchange capacities (IEC) of 1.03-1.64 mmol/g. The category of the alkoxysilanes strongly influences the membrane properties. The membrane from GPTS has the highest thermal stability with T d (temperature at 5% weight loss) of 267.4˚C, the highest IEC, and the lowest swelling degree in 65˚C water, which is due to the dual cross-linking of Si-O-Si and C-O-C between GPTS and PVA. When applied for diffusion dialysis (DD) process of NaOH/Na 2 WO 4 mixture, the membranes exhibit excellent alkali flux. The OH − dialysis coefficients (U OH ) are in the range of 0.0072-0.0208 m/h, higher than PVA blank membrane (0.0077 m/h) or commercial poly(2,6-dimethyl-1,4-phenylene oxide)-based membrane (0.004 m/h) (Tianwei Membrane Co., Ltd., Shandong of China). The separation factors (S) are in the range of 16.8-25.7, higher than PVA-PSSS membrane cross-linked with formaldehyde (S = 8.0). Hence, the membranes can be potentially applied in DD process for alkali recovery.

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“…Many researchers have used PVA as a hydrophilic modifier or as a coating on polymeric or ceramic surfaces for many separation applications [11,18,. Nevertheless, to the best of our knowledge, no study has been presented on the use of crosslinked PVA as an active RO separation layer under typical RO pressure without polymeric or ceramic substrates.…”

Section: G R a P H I C A L Abstract Abstract A R T I C mentioning

confidence: 99%

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

2016

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Enhancing the permselectivity of thin-film composite poly(vinyl alcohol) (PVA) nanofiltration membrane by incorporating poly(sodium-p-styrene-sulfonate) (PSSNa)

Cited by 92 publications

References 35 publications

Modification of polysulfone ultrafiltration membrane by sequential deposition of cross-linked poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) for nanofiltration

Modification of polysulfone ultrafiltration membrane by sequential deposition of cross-linked poly(vinyl alcohol) (PVA) and sodium carboxymethyl cellulose (CMCNa) for nanofiltration

PVA–PSSS membranes for alkali recovery through diffusion dialysis: effect of alkoxysilanes

Highly improved reverse osmosis performance of novel PVA/DGEBA cross-linked membranes by incorporation of Pluronic F-127 and MWCNTs for water desalination

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