Influence of glycol additives on the structure and performance of cellulose acetate/zinc oxide blend membranes

Desalination ◽  
2011 ◽  
Vol 270 (1-3) ◽  
pp. 98-104 ◽  
Author(s):  
Muddassir Ali ◽  
Muhammad Zafar ◽  
Tahir Jamil ◽  
Muhammad Taqi Zahid Butt
Keyword(s):  
Zinc Oxide ◽  
Cellulose Acetate ◽  
Blend Membranes ◽  
And Performance

Biodegradable blend membranes of poly (butylene succinate)/cellulose acetate/dextran: Preparation, characterization and performance

2017 ◽  
Vol 173 ◽  
pp. 497-507 ◽  
Author(s):  
Ali Hoseinzadeh Bahremand ◽  
Seyed Mahmoud Mousavi ◽  
Ali Ahmadpour ◽  
Mostafa Taherian
Keyword(s):  
Cellulose Acetate ◽  
Butylene Succinate ◽  
Blend Membranes ◽  
And Performance

Effect of Cellulose Acetate Phthalate (CAP) on Characteristics and Morphology of Polysulfone/Cellulose Acetate Phthalate (PSf/CAP) Blend Membranes

2014 ◽  
Vol 493 ◽  
pp. 640-644 ◽  
Author(s):  
Asmadi Ali ◽  
Rosli Mohd Yunus ◽  
Mohamad Awang ◽  
Anwar Johari ◽  
Ramli Mat
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Membrane Properties ◽  
Inversion Method ◽  
Hydrophilic Polymer ◽  
Cellulose Acetate Phthalate ◽  
Hydrophobic Membrane ◽  
Blend Membranes ◽  
And Performance ◽  
Uf Membranes

Polysulfone (PSf) membrane is catogorized as hydrophobic membrane that easily fouled during membrane operation process. The presence of second hydrophilic polymer which added into membrane casting solutions plays a crucial role in adjusting the membrane properties. This hydrophilic polymer was employed in hydrophobic polymer membranes in order to improve hydrophilicity and performance as well as formed antifouling ultrafiltration (UF) membranes. In this study, a hydrophilic polymer, cellulose acetate phthalate (CAP) was added into polysulfone (PSf) membrane casting solutions by blending technique to produce PSf/CAP blend membranes. Flat sheet asymmetric PSf/CAP blend membranes were prepared by wet phase inversion method. The results revealed that an increase in CAP increased the hydrophilicity properties of PSf/CAP blend membranes compared to pure PSf membrane. The significant changes in size and numbers of microvoids and macrovoids in the morphological structures of PSf/CAP blend membranes were due to CAP promote the instantaneous liquid-liquid demixing during phase inversion process.

The Effects of Evaporation Time on Morphological Structure of Polysulfone/Cellulose Acetate Phthalate/Polyvinylpyrrolidone (PSf/CAP/PVP) Blend Membranes

2014 ◽  
Vol 695 ◽  
pp. 77-80 ◽  
Author(s):  
Asmadi Ali ◽  
Rosli Mohd Yunus ◽  
Mohamad Awang ◽  
Ramli Mat
Keyword(s):  
Cellulose Acetate ◽  
Morphological Structure ◽  
Cellulose Acetate Phthalate ◽  
Evaporation Time ◽  
Membrane Morphology ◽  
Membrane Fabrication ◽  
Time Period ◽  
Blend Membranes ◽  
Fabrication Parameter ◽  
And Performance

Evaporation time is one of the important membrane fabrication parameter that can be manipulated in order to produce the desired membrane morphology in ultrafiltration (UF) separation process. The morphology of UF membrane has a significant effect on structural properties and performance of UF membrane. In this study, flat sheet asymmetric polysulfone/cellulose acetate phthalate/polyvinylpyrrolidone (PSf/CAP/PVP) blend membranes were prepared at different evaporation time in the range of 0 to 20 s to investigate its effect on the morphological structures of the blend membranes. The morphological structure of these blend membranes were characterized by using Scanning Electron Microscopy (SEM). The results showed that in the absence of evaporation time, the morphology of blend membrane consits of open finger-like structure and microvoids. Introduction of evaporation time period between 5 to 10 s, produced spongy blend membranes with less finger-like structure. Further increment of evaporation time between 15 to 20s, formed incomplete dense structure with small microvoids PSf/CAP/PVP blend membranes.

Preparation and performance of cellulose acetate–polyurethane blend membranes and their applications – II

2000 ◽  
Vol 169 (2) ◽  
pp. 215-228 ◽  
Author(s):  
M Sivakumar ◽  
R Malaisamy ◽  
C.J Sajitha ◽  
D Mohan ◽  
V Mohan ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Blend Membranes ◽  
And Performance

Effect of Calcination on the Basic Strength of Surface Modified Nano-Zinc Oxide Characterised by FTIR and Back Titration Methods

2015 ◽  
Vol 1107 ◽  
pp. 326-332
Author(s):  
Abdul Rahim Yacob ◽  
Kamaluddeen Suleiman Kabo
Keyword(s):  
Zinc Oxide ◽  
Metal Oxides ◽  
Base Catalysis ◽  
Nano Zinc Oxide ◽  
Back Titration ◽  
And Performance ◽  
Nano Zinc ◽  
Surface Modified ◽  
Heterogeneous Base ◽  
Basic Strength

The use of metal oxides in heterogeneous base catalysis has gained a large interest due to their application in many chemical and industrial processes and is environmental friendly. Basic metal oxides are commonly used and their structures, morphology and performance can be modified by method of preparation and thermal activation. In this study, surface modified amphoteric zinc oxide was prepared via hydration-dehydration method and characterised by TGA and FTIR. The basic strength at various temperatures is characterised by FTIR and back titration analyses. The results shows that surface modified zinc oxide has the highest basic strength of 1.453mmolg-1at 400°C making it a relatively good and suitable compound for use in heterogeneous basic catalysis. This result is also supported by FTIR spectra which show possible relationship between the Lewis O2-and increasing basic strength.

Investigation of polyvinylchloride and cellulose acetate blend membranes for desalination

2017 ◽  
Vol 1146 ◽  
pp. 14-22 ◽  
Author(s):  
Ayman El-Gendi ◽  
Heba Abdallah ◽  
Ashraf Amin ◽  
Shereen Kamel Amin
Keyword(s):  
Cellulose Acetate ◽  
Blend Membranes

Cellulose Acetate Blend Membranes

1972 ◽  
pp. 131-161 ◽  
Author(s):  
W. M. King ◽  
D. L. Hoernschemeyer ◽  
C. W. Saltonstall
Keyword(s):  
Cellulose Acetate ◽  
Blend Membranes
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