Preparation and characterization of thin film composite membranes modified with amine‐functionalized β‐cyclodextrins

Mbuli, Bhekani S.; Dlamini, Derrick S.; Nxumalo, Edward N.; Krause, Rui W. M.; Pillay, Visvanathan L.; Oren, Yoram; Linder, Charles; Mamba, Bhekie B.

doi:10.1002/app.38667

Cited by 24 publications

(14 citation statements)

References 40 publications

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“…The flux ( J w ) was calculated using eq. :

J_{w} = \frac{V}{t A}

where V ( l ) is the volume of water collected at a particular time ( t ) (h) and A is the active surface area (m 2 ) of the membrane.…”

Section: Methodsmentioning

confidence: 99%

“…The rejection of the PEG‐2000 was determined using a refractometer and calculated using eq. :

R = 100 \times (1 - \frac{C_{p}}{C_{f}})

where C p is the pollutant concentration of the permeate stream and C f is the pollutant concentration of the feed solution.…”

Section: Methodsmentioning

confidence: 99%

“…In our previously reported work, amino functionalized cyclodextrins (CDs) were incorporated into the polyamide active thin‐film barrier through in situ interfacial polymerization . Mbuli et al tested these modified TFC membranes for the removal of NaCl and NaSO 4 salts, but the removal of organic molecules and fouling behavior were not reported . Therefore, this article reports on the fouling behavior of the membranes using PEG as model organic foulant .…”

Section: Introductionmentioning

confidence: 99%

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Development of antifouling polyamide thin‐film composite membranes modified with amino‐cyclodextrins and diethylamino‐cyclodextrins for water treatment

Mbuli

Nxumalo

Mhlanga

et al. 2013

J of Applied Polymer Sci

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The fouling behavior of polyamide thin-film composite (TFC) membranes modified with amino-and diethylaminocyclodextrins (CDs) through an in situ interfacial polymerization process is reported. Modified polyamide TFC membranes exhibited improved hydrophilicity, water permeability, and fouling resistance as compared to the unmodified TFC membranes, while restricting the passage of NaCl salt (98.46 6 0.5%). The increase in hydrophilicity was attributed to the secondary and tertiary hydroxyl groups of the CDs, which were not aminated. The membranes modified with amino-CDs had increased surface roughness while the membranes modified with diethylamino-CDs had smoother surfaces. However, despite the surface roughness of the membranes modified with amino-CDs, low fouling was observed due to the highly hydrophilic surfaces, which superseded the roughness. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40109.

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“…The flux ( J w ) was calculated using eq. :

J_{w} = \frac{V}{t A}

where V ( l ) is the volume of water collected at a particular time ( t ) (h) and A is the active surface area (m 2 ) of the membrane.…”

Section: Methodsmentioning

confidence: 99%

“…The rejection of the PEG‐2000 was determined using a refractometer and calculated using eq. :

R = 100 \times (1 - \frac{C_{p}}{C_{f}})

where C p is the pollutant concentration of the permeate stream and C f is the pollutant concentration of the feed solution.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of antifouling polyamide thin‐film composite membranes modified with amino‐cyclodextrins and diethylamino‐cyclodextrins for water treatment

Mbuli

Nxumalo

Mhlanga

et al. 2013

J of Applied Polymer Sci

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“…Most of commercial composite membranes are thin‐film composite (TFC) membranes prepared by interfacial polymerization (IP) of diamine and acyl chloride . The active layer is formed on porous flat sheet membranes and rarely coated on hollow fiber substrates .…”

Section: Introductionmentioning

confidence: 99%

“…Most of commercial composite membranes are thin-film composite (TFC) membranes prepared by interfacial polymerization (IP) of diamine and acyl chloride. [1][2][3] The active layer is formed on porous flat sheet membranes and rarely coated on hollow fiber substrates. 4,5 Due to high-packing density and selfsupport, hollow fiber used as substrates in the preparation of composite membrane has attracted more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of high‐selectivity hollow fiber composite nanofiltration membrane by two‐way coating technique

Wang

Zhang

2014

J of Applied Polymer Sci

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A novel coating technique, named as two‐way coating (TWC), was explored to prepare hollow fiber composite (HFC) nanofiltration (NF) membrane through interfacial polymerization from piperazine (PIP) and trimesoyl chloride (TMC) on the lumen side of hollow fiber polysulfone ultrafiltration membrane with an effective membrane area of 0.4 m2. The optimum preparation conditions were systematically investigated and obtained as follows: PIP 0.023 mol/L, TMC 0.0057 mol/L, air blowing rate 2.7 m/s for 30 min after aqueous coating, aqueous coating pressure 0.1 MPa, organic solution flowing rate 0.32 m/s, and heat treating time 3 min. The resultant HFC membrane showed a high selectivity of divalent ion and monovalent ion. Salt rejections of MgSO4 and NaCl were 98.13 and 18.6% with the permeate flux of 32.6 and 40.2 L m−2 h−1 at 0.7 MPa, respectively. Field emission scanning electron microscopy images indicated that composite membrane prepared by TWC technique had a uniform active layer from the upper end to the bottom of the hollow fiber. And the salt rejection and permeate flux showed almost no difference between different membrane sections. Stability results suggested that good reproducibility could be obtained by TWC technique for the preparation of high‐performance HFC NF membrane. The resultant NF membrane showed a high removal rate of chemical oxygen demand and chroma of landfill leachate which were approximately 100%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41187.

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Fouling Resistance and Physicochemical Properties of Polyamide Thin‐Film Composite Membranes Modified with Functionalized Cyclodextrins

et al. 2016

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Thermal and mechanical properties and fouling resistance of polyamide thin-film composite (PA-TFC) membranes modified with amino-cyclodextrins and diethylamino-cyclodextrins are investigated. It was found that the decomposition temperatures of the modified membranes were 500°C and were not significantly different with those of the unmodified membranes. Differential scanning calorimetry (DSC) studies showed that the modified membranes with heating melting temperatures in the range 112.5-113.8°C were more crystalline than the unmodified membranes due to the presence of cyclodextrin derivatives on the interfacial layer. The crystallization temperatures (T c ) were found to range between 128.75 and 129.03°C and the glass transition temperatures (T g ) ranged between 78.67 and 79.33°C. The modified PA-TFC membranes were found to have comparable ultimate tensile strengths (UTS) to the unmodified membranes, except for the membranes modified with amino-b-CDs, with a UTS of 20.00 AE 0.50 MPa. The PA-TFC membranes had a lower water uptake percentage due to their enhanced crystallinity. However, these materials had a higher water permeate flux due to the hydrophilic nature of the modified membranes enhanced by the rich hydroxyl groups on the CDs. The modified PA-TFC membranes also exhibited high MgSO 4 salt rejection and fouling resistance capacities compared to unmodified membranes. Different pH levels resulted in different fouling resistance patterns of the membranes. Therefore, the membranes modified with functionalized CDs were thermally and mechanically stable, had enhanced crystallinity, high divalent salt rejection and fouling resistance under different pH conditions.

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Preparation and characterization of thin film composite membranes modified with amine‐functionalized β‐cyclodextrins

Cited by 24 publications

References 40 publications

Development of antifouling polyamide thin‐film composite membranes modified with amino‐cyclodextrins and diethylamino‐cyclodextrins for water treatment

Development of antifouling polyamide thin‐film composite membranes modified with amino‐cyclodextrins and diethylamino‐cyclodextrins for water treatment

Preparation and characterization of high‐selectivity hollow fiber composite nanofiltration membrane by two‐way coating technique

Fouling Resistance and Physicochemical Properties of Polyamide Thin‐Film Composite Membranes Modified with Functionalized Cyclodextrins

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