Preparation, characterization and performance study of cellulose acetate membranes modified by aliphatic hyperbranched polyester

Mahdavi, Hossein; Shahalizade, Taieb

doi:10.1016/j.memsci.2014.09.013

Cited by 48 publications

(22 citation statements)

References 39 publications

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“…In this study, we categorized total fouling ratio (

R_{t} true)

of a membrane into reversible (

R_{r}

) and irreversible (

R_{i r} true)

fouling ratio (Rahimpour et al . ; Mahdavi & Shahalizade ). The fouling ratio was calculated according to Eqs , , and :

R_{r} true(% true) = \frac{J_{w 2} - J_{P}}{J_{w 1}} * 100

R_{i r} true(% true) = \frac{J_{w 1} - J_{w 2}}{J_{w 1}} * 100

R_{t} (|, %) = R_{r} + R_{i r} = \frac{{normalJ}_{normalw 1} - {normalJ}_{normalP}}{{normalJ}_{normalw 1}} * 100

…”

Section: Methodsmentioning

confidence: 99%

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Investigation of the effect of coagulation bath composition on PVDF/CA membrane by evaluating critical flux and antifouling properties in lab‐scale submerged MBR

Razzaghi

Tavakolmoghadam²,

Rekabdar³

et al. 2018

Water & Environment J

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Ultrafiltration membranes were prepared from blends of poly(vinylidene fluoride) (PVDF)/cellulose acetate (CA) via phase inversion method. The effect of different coagulation bath compositions on the morphology and performance of the blend membrane prepared from casting solution of PVDF/CA with ratio of 80/20 was investigated using sewage wastewater. NaCl and ethanol were used as additives of coagulation bath. Fouling analysis was conducted with Bovine Serum Albumin solution and critical flux evaluation was performed using a lab‐scale membrane bioreactor. In terms of morphological structure, the macrovoids decreased and changed to finger‐like structure. The irreversible fouling reduced and the flux recovery ratio (FRR) of the modified membranes increased remarkably while the reversible fouling caused by deposition of foulants on the surface of the membranes increased. The maximum values of FRR and critical flux of irreversibility were reached by the membrane which was prepared in the coagulation bath containing the highest concentration of NaCl.

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“…In this study, we categorized total fouling ratio (

R_{t} true)

of a membrane into reversible (

R_{r}

) and irreversible (

R_{i r} true)

fouling ratio (Rahimpour et al . ; Mahdavi & Shahalizade ). The fouling ratio was calculated according to Eqs , , and :

R_{r} true(% true) = \frac{J_{w 2} - J_{P}}{J_{w 1}} * 100

R_{i r} true(% true) = \frac{J_{w 1} - J_{w 2}}{J_{w 1}} * 100

R_{t} (|, %) = R_{r} + R_{i r} = \frac{{normalJ}_{normalw 1} - {normalJ}_{normalP}}{{normalJ}_{normalw 1}} * 100

…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we categorized total fouling ratio (R t Þ of a membrane into reversible (R r ) and irreversible (R ir Þ fouling ratio (Rahimpour et al 2011;Mahdavi & Shahalizade 2015). The fouling ratio was calculated according to Eqs (5), (6), and (7):…”

mentioning

confidence: 99%

Investigation of the effect of coagulation bath composition on PVDF/CA membrane by evaluating critical flux and antifouling properties in lab‐scale submerged MBR

Razzaghi

Tavakolmoghadam²,

Rekabdar³

et al. 2018

Water & Environment J

View full text Add to dashboard Cite

show abstract

“…The wet membranes were first freeze-dried and then cut into rectangular shapes (15 3 100 mm 2 ). 21 The hydrophilicity of the prepared membranes was analyzed to test the contact angle between water and the membranes with contact angle measurements (G10, KR } USS, Germany). To minimize the experimental error, the contact angle was measured at five random locations for each sample, and the average value was recorded.…”

Section: Membrane Characterizationmentioning

confidence: 99%

“…The absorptions at 3340, 2900, 1640, and 1430 cm 21 were related to the OAH stretching vibrations of cellulose, CAH stretching vibrations of cellulose, bending vibrations of absorbing HAOAH groups, and CH 2 scissor bending vibrations of cellulose, respectively; these were in conformity with the characteristic cellulose absorption peak position. 28 Compared with the pure CA membrane [ Figure 2(b)], the ATR-FTIR spectrum of the CNC/CA composite membrane [ Figure 2(c)] showed an obvious band at 3340 cm 21 , which was attributed to the absorption of the OAH stretching vibrations of cellulose; this suggested that the CNCs existed in the composite membranes.…”

Section: Structure and Morphology Of The Membranementioning

confidence: 99%

Cellulose acetate ultrafiltration membranes reinforced by cellulose nanocrystals: Preparation and characterization

Zhou

Chen

et al. 2016

J of Applied Polymer Sci

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Cellulose nanocrystals (CNCs) were used as a sustainable additive to improve the hydrophilicity, permeability, antifouling, and mechanical properties of blend membranes. Different CNC loadings (0-1.2 wt %) in cellulose acetate (CA) membranes were studied. The blend membranes were prepared by a phase-inversion process, and their chemical structure and morphological properties were characterized by attenuated total reflectance-Fourier transform infrared spectroscopy, scanning electron microscopy, porosity, and mean pore size and contact angle measurement. The blend membranes became more porous and more interconnected after the addition of CNCs. The thickness of the top layer decreased and a few large holes in the porous substrate appeared with increasing CNC loading. In comparison with the pure CA membranes, the pure water flux of the blend membranes increased with increasing CNC loading. It reaches a maximum value of 76 LÁm 22 Áh 21 when the CNC loading was 0.5 wt %. The antifouling properties of the CA membrane were significantly improved after the addition of CNCs, and the flux recovery ratio value increased to 68% with the addition of 0.5 wt % CNCs. In comparison with that of the pure CA membranes, the tensile strength of the composite membranes increased by 47%. This study demonstrated the importance of using sustainable CNCs to achieve great improvements in the physical and chemical performance of CA ultrafiltration membranes and provided an efficient method for preparing high-performance membranes.

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“…Because of the high porosity and uniform pore diameter of CA, some researchers have applied it in the field of membranes. A novel aliphatic hyperbranched polyester modified CA membrane exhibited a low flux, high hydraulic resistance, and good thermal and mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of innovative cellulose diacetate/epoxy resin blends modified by isophorone diamine

Ming

Zhu

et al. 2016

J of Applied Polymer Sci

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Cellulose diacetate (CA)/epoxy resin (EP) blends with excellent mechanical performance were prepared with simple blending followed by curing with isophorone diamine (IPDA). The reaction between the amino groups of IPDA and epoxide groups of EP was confirmed by Fourier transform infrared spectroscopy. Scanning electron microscopy revealed that the cured EP particles gradually became larger and closer to each other to form semi‐interpenetrating polymer networks in the CA matrix; this contributed to the improved mechanical properties of the CA/EP blends. Dynamic rheological experiments indicated that the CA/EP blends with semi‐interpenetrating polymer networks retained processability. After the introduction of a low content (5–10 phr) of IPDA, the mechanical properties of the CA/EP blends were significantly enhanced. With the addition of 20–30‐phr IPDA, the CA/EP blend exhibited a tensile strength of 77 MPa, a flex strength of 65 MPa, a flex modulus of 2.6 GPa, and a hardness of 94 HD; these values were much higher than those of the pristine CA/EP binary blend. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44151.

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Preparation, characterization and performance study of cellulose acetate membranes modified by aliphatic hyperbranched polyester

Cited by 48 publications

References 39 publications

Investigation of the effect of coagulation bath composition on PVDF/CA membrane by evaluating critical flux and antifouling properties in lab‐scale submerged MBR

Investigation of the effect of coagulation bath composition on PVDF/CA membrane by evaluating critical flux and antifouling properties in lab‐scale submerged MBR

Cellulose acetate ultrafiltration membranes reinforced by cellulose nanocrystals: Preparation and characterization

Preparation and characterization of innovative cellulose diacetate/epoxy resin blends modified by isophorone diamine

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