A thin film nanocomposite reverse osmosis membrane containing amine-functionalized carbon nanotubes

Vatanpour, Vahid; Safarpour, Mahdie; Khataee, Alireza; Zarrabi, Hamed; Yekavalangi, Mohammad Ehsan; Kavian, Mostafa

doi:10.1016/j.seppur.2017.04.038

Cited by 130 publications

(42 citation statements)

References 41 publications

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“…These additives tended to act as acid absorber and pH controller, respectively, and hindered the hydrolysis of acid chloride and protonation of amine monomers during IP process. Furthermore, shrinkage degree also can be reduced during the curing process as a consequence of the presence of amine salts formed from TEA and CSA in the aqueous phase …”

Section: Resultsmentioning

confidence: 99%

Boron removal and antifouling properties of thin‐film nanocomposite membrane incorporating PECVD‐modified titanate nanotubes

Chong

Lau

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Incorporation of nanofillers into the polyamide (PA) layer of thin‐film composite (TFC) membrane could improve membrane surface properties for enhanced water separation efficiency. However, most nanofillers do not disperse well in organic medium. In this work, the surface of titanate nanotubes (TNTs) was modified via the plasma‐enhanced chemical vapour deposition (PECVD) method in order to promote its dispersion rate (in organic medium) during thin‐film nanocomposite (TFN) membrane fabrication. RESULTS Fourier transform infrared (FTIR) analysis confirmed the surface chemistry of TNTs coated by hexafluorobutyl acrylate (HFBA) or hydroxyethyl methacrylate (HEMA) via PECVD method. The effects of embedding modified TNTs into the PA layer on membrane surface morphology, hydrophilicity and performance were also investigated and the results were further compared with commercial reverse osmosis (RO) membranes. It was found that the incorporation of HFBA‐ and HEMA‐modified TNTs could enhance the membrane water permeability by >25% and >40%, respectively, without compromising their salt rejection. The boron rejections of TFN membranes incorporated with HFBA‐ and HEMA‐modified TNTs meanwhile were recorded at 75.56% and 70.73%, respectively; these values were relatively higher than those for the self‐synthesized TFC (68.57%) and commercial RO membranes (37–39%). The developed TFN membranes also exhibited higher fouling tolerance than the commercial RO membranes, achieving >94% of water flux regeneration as a result of enhanced membrane surface hydrophilicity. CONCLUSION Compared to hydrophilic modification using HEMA, nanofillers modified by hydrophobic HFBA proved more effective at producing a PA layer with better nanofiller distribution, making the resultant TFN membrane more suitable for desalination processes. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Boron removal and antifouling properties of thin‐film nanocomposite membrane incorporating PECVD‐modified titanate nanotubes

Chong

Lau

et al. 2019

J of Chemical Tech & Biotech

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Section: Synthesis Of Ox-cno Cl-cno and Cs-g-cnomentioning

confidence: 99%

“…The next step was the acyl chloride-functionalized CNO (CNO-COCl, Scheme 2) preparation based on a similar synthetic modification performed for multi-walled carbon nanotubes (MWCNT) [86], which was achieved by suspending the ox-CNO in a solution of thionyl chloride (5 mL). The suspension was stirred for 24 h at 70 • C. Then, a black solid was separated after solvent removal was half-reduced under reduced pressure on a rotary evaporator (Heidolph Hei-VAP Value Digital HB/G3B with vertical coil condenser, Germany) and then dried on a vacuum oven overnight.…”

Section: Scheme 2 Synthesis Of the Acyl Chloride-functionalized Carbmentioning

confidence: 99%

Nanocomposite Films of Chitosan-Grafted Carbon Nano-Onions for Biomedical Applications

et al. 2020

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The design of scaffolding from biocompatible and resistant materials such as carbon nanomaterials and biopolymers has become very important, given the high rate of injured patients. Graphene and carbon nanotubes, for example, have been used to improve the physical, mechanical, and biological properties of different materials and devices. In this work, we report the grafting of carbon nano-onions with chitosan (CS-g-CNO) through an amide-type bond. These compounds were blended with chitosan and polyvinyl alcohol composites to produce films for subdermal implantation in Wistar rats. Films with physical mixture between chitosan, polyvinyl alcohol, and carbon nano-onions were also prepared for comparison purposes. Film characterization was performed with Fourier Transformation Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Tensile strength, X-ray Diffraction Spectroscopy (XRD), and Scanning Electron Microscopy (SEM). The degradation of films into simulated body fluid (SBF) showed losses between 14% and 16% of the initial weight after 25 days of treatment. Still, a faster degradation (weight loss and pH changes) was obtained with composites of CS-g-CNO due to a higher SBF interaction by hydrogen bonding. On the other hand, in vivo evaluation of nanocomposites during 30 days in Wistar rats, subdermal tissue demonstrated normal resorption of the materials with lower inflammation processes as compared with the physical blends of ox-CNO formulations. SBF hydrolytic results agreed with the in vivo degradation for all samples, demonstrating that with a higher ox-CNO content increased the stability of the material and decreased its degradation capacity; however, we observed greater reabsorption with the formulations including CS-g-CNO. With this research, we demonstrated the future impact of CS/PVA/CS-g-CNO nanocomposite films for biomedical applications.

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“…In addition, the PA TFN membranes modified by functionalized CNTs showed excellent anti‐fouling property to bovine serum albumin. Vatanpour et al prepared PA TFN membrane by adding amine‐functionalized CNTs (CNT‐NH 2 ) into PA selective layer 25 . All PA TFN membranes had higher NaCl rejections than unmodified membrane.…”

Section: Introductionmentioning

confidence: 99%

Improved separation performance of polyamide based reverse osmosis membrane incorporated with poly(dopamine) coated carbon nanotubes

Zhang

Yan

et al. 2021

J of Applied Polymer Sci

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A series of polyamide thin‐film nanocomposite (PA TFN) membranes have been fabricated by incorporating hydrophilic poly(dopamine) (PDA) coated carbon nanotubes (CNTs@PDA) into the PA selective layer via interfacial polymerization. The effects of PDA coating thickness on surface characteristics and separation performances of membranes are studied in detail. The PDA coating makes the surface of PA TFN membrane more hydrophilic, smoother and less electronegative. The desalination performance is obviously influenced by the coating thickness of PDA and the loading concentration of PDA@CNTs. The water fluxes of PDA@CNTs incorporated PA TFN membranes have been improved without sacrificing NaCl rejections. When the loading concentration is 0.0010%, the maximum water flux is 48.1 L m−2 h increasing by 45% compared with that of pristine PA membrane. Meanwhile, the NaCl rejection is up to 99.8%. The CNTs@PDA incorporated PA TFN membranes exhibit better anti‐fouling property and separation performance durability. This work proves that CNTs@PDA has great potential application in PA TFN membranes.

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A thin film nanocomposite reverse osmosis membrane containing amine-functionalized carbon nanotubes

Cited by 130 publications

References 41 publications

Boron removal and antifouling properties of thin‐film nanocomposite membrane incorporating PECVD‐modified titanate nanotubes

Boron removal and antifouling properties of thin‐film nanocomposite membrane incorporating PECVD‐modified titanate nanotubes

Nanocomposite Films of Chitosan-Grafted Carbon Nano-Onions for Biomedical Applications

Improved separation performance of polyamide based reverse osmosis membrane incorporated with poly(dopamine) coated carbon nanotubes

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