Improving the performance of polyamide reverse osmosis membrane by incorporation of modified multi-walled carbon nanotubes

Zhao, Haiyang; Qiu, Shi; Wu, Li–guang; Zhang, Lin; Chen, Huan-Lin; Gao, Congjie

doi:10.1016/j.memsci.2013.09.014

Cited by 414 publications

(170 citation statements)

References 38 publications

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“…A recent review authored by Lau et al [2] has summarized the effects of various types of inorganic nanomaterials on the intrinsic properties and performances of PA TFN membranes for separation processes covering not only aqueous-based media like nanofiltration (NF), reverse osmosis (RO) and forward osmosis (FO), but also for the treatment of organic solvents as well as pervaporation processes. Depending on the type and characteristics of nanomaterials used, the resultant TFN membrane could show attractive features associated with bacterial, fouling and chlorine resistance, in addition to enhancement in water flux [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…One of them is the different approach used by researchers to introduce nanomaterials during interfacial polymerization process. As can be seen from Table 1, inorganic nanomaterials could be added either into amine aqueous or acyl chloride organic solution in the process of PA synthesis [1,5,[7][8][9][10][11][12]. However, owing to the hydrophilic nature of nanomaterials, most research has preferred to introduce nanomaterials in amine aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

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A practical approach to synthesize polyamide thin film nanocomposite (TFN) membranes with improved separation properties for water/wastewater treatment

et al. 2016

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Thin film nanocomposite (TFN) membranes containing 0.05 or 0.10 w/v% functionalized titanate nanotubes (TNTs) in polyamide selective layer were prepared via interfacial polymerization of piperazine (PIP) and trimesoyl chloride (TMC) monomers. Nanomaterials were dispersed into the monomer solution using two different approaches. In the first one, the functionalized TNTs were dispersed into the amine aqueous solution, while in the second approach the same nanomaterials were dispersed in TMC organic solution. The TFN membranes were characterized and compared with a control thin film composite (TFC) membrane to investigate the effect of nanofiller loadings and the fabrication approach on membrane properties. Results showed that introducing nanofillers into the organic phase was more effective to synthesize a TFN membrane of greater separation performance as the use of rubber roller to remove aqueous solution from the substrate surface could cause the loss of a significant amount of nanofillers, which further affected the polyamide layer integrity. It was also found that incorporation of high nanofiller loading tended to interfere with interfacial polymerization and weaken the bonds between monomers blocks, resulting in poor polyamide-nanotubes integrity. Compared to the TFC membrane, the TFN membrane made of 2% PIP and 0.15% TMC with 0.5% nanofiller incorporation could achieve greater water flux (7.5 vs 5.4 L/m 2 .h.bar) and Na2SO4 rejection (96.4% vs 86%) while exhibiting higher resistance against the fouling by protein and dye.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A practical approach to synthesize polyamide thin film nanocomposite (TFN) membranes with improved separation properties for water/wastewater treatment

et al. 2016

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“…According to that, Lin Zhang et al [15] and Haiyang Zhao et al [26] synthesised the polyamide/MWNTs membrane. Compared with the raw polyamide composite membrane, the increase of the amount of MWNTs (contains hydrophilic group) in a membrane would enlarge the water flux, while the salt rejection remained relatively high (>90%) in spite of a slight decrease.…”

Section: Introductionmentioning

confidence: 99%

Tip and inner walls modification of single-walled carbon nanotubes (3.5 nm diameter) and preparation of polyamide/modified CNT nanocomposite reverse osmosis membrane

Wang

Yang

Gao

et al. 2017

Journal of Experimental Nanoscience

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(2018) Tip and inner walls modification of single-walled carbon nanotubes (3.5 nm diameter) and preparation of polyamide/modified CNT nanocomposite reverse osmosis membrane, Journal of Experimental Nanoscience, 13:1, 11-26, DOI: 10.1080/17458080.2017 ABSTRACTTo enhance the water flux and salt rejection of reverse osmosis membranes, thin film nanocomposite reverse osmosis membranes were prepared by incorporating functionalised single-walled carbon nanotubes (SWNTs). The functionalised SWNTs were obtained by chemical process such as mixed acid oxidation and substitution reaction. The SWNTs were characterised by HRTEM, FTIR, TGA, Raman spectra, UV-Vis and XPS, etc. The surface morphology and structure of membrane were characterised by SEM and contact angle measurement, respectively. The results showed that carboxyl, acyl, amide and amine were successfully grafted on the tip and inner wall of the single-walled carbon nanotubes. The dispersity of the functionalised SWNTs in water was tested, indicating a good hydrophilic property. The polyamide/modified CNT nanocomposite reverse osmosis membrane was prepared. Compared with the bare polyamide membrane, the SWNT-polyamide thin film nanocomposite membranes showed higher property in hydrophilic surface and its water flux, as along with salt rejection, improved dramatically. The experimental results revealed that the modified SWNTs (especially those containing hydrophilic groups such as carboxyl groups and amino groups) well dispersed in the polyamide thin film layer, and hence improved the water permeation, and the salt rejection. KEYWORDSSingle-walled carbon nanotubes; inner/surface modification; SWNTpolyamide nanocomposite membranes; water flux and salt rejection ABBREVIATION CNTs: carbon nanotubes

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“…Based on above, hydrophilicity and antifouling ability of membrane surface can be enhanced due to minimization of mass transfer resistance between the semi-conductor surface and fluid bulk via the forced transport of reactants by convection [5]. Great variety of materials has been used for the membrane surface modification, such as TiO 2 nanotubes [6], TiO 2 -graphene oxide (GO) [7][8][9], carbon nanotubes (CNTs) [10][11][12][13], etc.…”

Section: Introductionmentioning

confidence: 99%

Modified Polyethersulfone Membranes With Photocatalytic Properties

Dzhodzhyk¹,

Kolesnyk²,

Konovalova³

et al. 2017

ChChT

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Abstract.1 The photocatalityc nanocomposite membranes with tin(IV) oxide nanoparticles were obtained by "layerby-layer" self-assembly. Polyelectrolyte complexes with different nature were analyzed as a binder for nanocatalysts. PEI was used as a positively charged polyelectrolyte, and CMC, sodium alginate, κ-or ι-carrageenans were used as negatively charged ones. The presence of SnO 2 on the membrane surface was confirmed by a scanning electron microscopy (SEM). Polyelectrolyte complexation was studied by zeta-potential measurement. The photocatalytic activity of the nanocomposite membranes was evaluated in the process of milk nanofiltration. The modification of polyethersulfone membranes with polyelectrolyte layers and SnO 2 nanoparticles allowed to produce a highly concentrated retentate and membrane flux remained stable for over 8 h.

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Improving the performance of polyamide reverse osmosis membrane by incorporation of modified multi-walled carbon nanotubes

Cited by 414 publications

References 38 publications

A practical approach to synthesize polyamide thin film nanocomposite (TFN) membranes with improved separation properties for water/wastewater treatment

A practical approach to synthesize polyamide thin film nanocomposite (TFN) membranes with improved separation properties for water/wastewater treatment

Tip and inner walls modification of single-walled carbon nanotubes (3.5 nm diameter) and preparation of polyamide/modified CNT nanocomposite reverse osmosis membrane

Modified Polyethersulfone Membranes With Photocatalytic Properties

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