Novel cellulose acetate propionate‐halloysite composite membranes with improved permeation flux, salt rejection, and antifouling properties

2020 ◽  
Vol 31 (11) ◽  
pp. 2526-2534
Author(s):  
Majed M. Alghamdi ◽  
Adel A. El‐Zahhar
Keyword(s):  
Cellulose Acetate ◽  
Composite Membranes ◽  
Permeation Flux ◽  
Salt Rejection ◽  
Cellulose Acetate Propionate

Dehydration of water/pyridine mixtures by pervaporation using cellulose acetate/ polyacrylonitrile blend membrane

2011 ◽  
Vol 63 (8) ◽  
pp. 1695-1700 ◽  
Author(s):  
J. H. Lv ◽  
G. M. Xiao
Keyword(s):  
Cellulose Acetate ◽  
Separation Factor ◽  
Experimental Results ◽  
Separation Performance ◽  
Permeation Flux ◽  
Feed Concentration ◽  
Blend Membrane ◽  
Pyridine Solution ◽  
Operation Temperature

Cellulose acetate/ polyacrylonitrile (CA/PAN) membranes were prepared and used to separate pyridine / water mixtures by pervaporation. The membranes were characterized through SEM. The effects of feed concentration, operation temperature and downstream pressure on the separation performance were evaluated. Experimental results indicated the increase of operation temperature could raise the permeation flux and the separation factor, while increasing feed concentration and downstream pressure would raise the separation factor and decrease the permeation flux. Under the conditions that pyridine solution was 99 wt.%, operation temperature was 323 K and downstream pressure was 20 mmHg, the CA/PAN blend membrane showed its best separation performance that the permeation flux was 56 · g · m−2 h−1 and the separation factor was 182.

scholarly journals Linking defects, hierarchical porosity generation and desalination performance in metal–organic frameworks

2018 ◽  
Vol 9 (14) ◽  
pp. 3508-3516 ◽  
Author(s):  
Weibin Liang ◽  
Lin Li ◽  
Jingwei Hou ◽  
Nicholas D. Shepherd ◽  
Thomas D. Bennett ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Water Flux ◽  
Composite Membranes ◽  
High Salt ◽  
Salt Rejection ◽  
Hierarchical Porosity ◽  
Metal Organic

The composite membranes with defective metal–organic frameworks (MOFs) show a significant increase in water flux, without compromising the high salt rejection.

scholarly journals EVALUATION OF BACTERIAL CELLULOSE-SODIUM ALGINATE FORWARD OSMOSIS MEMBRANE FOR WATER RECOVERY

2018 ◽  
Vol 80 (3-2) ◽  
Author(s):  
Ngan T. B. Dang ◽  
Liza B. Patacsil ◽  
Aileen H. Orbecido ◽  
Ramon Christian P. Eusebio ◽  
Arnel B. Beltran
Keyword(s):  
Contact Angle ◽  
Bacterial Cellulose ◽  
Sodium Alginate ◽  
Water Flux ◽  
Forward Osmosis ◽  
Composite Membranes ◽  
Membrane Thickness ◽  
Water Recovery ◽  
Sem Images ◽  
Salt Rejection

Water resources are very important to sustain life. However, these resources have been subjected to stress due to population growth, economic and industrial growth, pollution and climate change. With these, the recovery of water from sources such as wastewater, dirty water, floodwater and seawater is a sustainable alternative. The potential of recovering water from these sources could be done by utilizing forward osmosis, a membrane process that exploits the natural osmotic pressure gradient between solutions which requires low energy operation. This study evaluated the potential of forward osmosis (FO) composite membranes fabricated from bacterial cellulose (BC) and modified with sodium alginate. The membranes were evaluated for water flux and salt rejection. The effect of alginate concentrations and impregnation temperatures were evaluated using 0.6 M sodium chloride solution as feed and 2 M glucose solution as the draw solution. The membranes were characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Contact Angle Meter (CAM). The use of sodium alginate in BC membrane showed a thicker membrane (38.3 μm to 67.6 μm), denser structure (shown in the SEM images), and more hydrophilic (contact angle ranges from 28.39° to 32.97°) compared to the pristine BC membrane (thickness = 12.8 μm and contact angle = 66.13°). Furthermore, the alginate modification lowered the water flux of the BC membrane from 9.283 L/m2-h (LMH) to value ranging from 2.314 to 4.797 LMH but the improvement in salt rejection was prominent (up to 98.57%).

Composite Membranes with Cellulose Acetate Surface Layer for Water Treatment

2021 ◽  
Vol 12 (5) ◽  
pp. 1229-1235
Author(s):  
D. D. Fazullin ◽  
L. I. Fazullina ◽  
G. V. Mavrin ◽  
I. G. Shaikhiev ◽  
V. O. Dryakhlov
Keyword(s):  
Surface Layer ◽  
Water Treatment ◽  
Cellulose Acetate ◽  
Composite Membranes

scholarly journals Supercritical Phase Inversion: A Powerful Tool for Generating Cellulose Acetate-AgNO3 Antimicrobial Membranes

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1560
Author(s):  
Lucia Baldino ◽  
Stefano Cardea ◽  
Ernesto Reverchon
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Active Agent ◽  
Composite Membranes ◽  
Time Interval ◽  
Membrane Pore ◽  
Supercritical Phase ◽  
Silver Nitrate Concentration ◽  
Membrane Pore Size ◽  
Silver Release

Antimicrobial composite membranes, formed by cellulose acetate loaded with AgNO3 particles, were produced by supercritical phase inversion. Different cellulose acetate concentrations were tested (15%, 20%, 30%(w/w)), whereas the active agent (i.e., silver nitrate) concentration was fixed at 0.1%(w/w) with respect to the quantity of polymer used. To determine the influence of the process parameters on membranes morphology, the pressure and temperature were varied from 150 to 250 bar and from 55 to 35 °C, respectively. In all cases, regularly porous membranes were produced with a uniform AgNO3 distribution in the membrane matrix. Silver release rate depended on membrane pore size, covering a time interval from 8 to 75 h.

Sign in / Sign up

Export Citation Format

Share Document