Thin-Film Composite Polyamide Membranes Functionalized with Biocidal Graphene Oxide Nanosheets

2013 ◽  
Vol 1 (1) ◽  
pp. 71-76 ◽  
Author(s):  
François Perreault ◽  
Marissa E. Tousley ◽  
Menachem Elimelech
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Graphene Oxide Nanosheets ◽  
Film Composite ◽  
Thin Film Composite ◽  
Polyamide Membranes

scholarly journals Acid-Resistance Enhancement of Thin-Film Composite Membrane Using Barrier Effect of Graphene Oxide Nanosheets

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3151
Author(s):  
Hee-Ro Chae ◽  
In-Chul Kim ◽  
Young-Nam Kwon
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Acid Resistance ◽  
Barrier Effect ◽  
Graphene Oxide Nanosheets ◽  
Film Composite ◽  
Membrane Selectivity ◽  
Thin Film Composite ◽  
Acid Reaction ◽  
Walled Carbon Nanotubes

In this study, the effect of graphene oxide nanosheets (GONs) embedded in a thin-film composite (TFC) polyamide (PA) membrane on the acid resistance of the membrane was investigated by comparison with the effect of oxidized single-walled carbon nanotubes (o-SWNTs). Both GONs and o-SWNTs increased the hydrophilicity of the membranes and caused the formation of ridges and clustered bumps on the surfaces, resulting in slightly improved water permeability. However, the o-SWNTs-embedded membrane did not show a difference in acid resistance depending on the concentration of embedded material, but the acid resistance of the GONs-embedded membrane increased with increasing concentration. The acid resistance of the GONs-embedded membranes appears to be mainly due to the barrier effect caused by the nanosheet shape of the GONs along with a sacrificial role of the PA layer protruded by the addition of GONs and the decrease of acid reaction sites by the hydrogen bonding between GONs and PA. When the TFC PA membrane was prepared with a high amount (300 ppm) of the GONs without considering aggregation of GONs, membrane selectivity exceeding 95% was maintained 4.7 times longer than the control TFC membrane. This study shows that the acid resistance can be enhanced by the use of GONs, which give a barrier effect to the membrane.

Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets

2015 ◽  
Vol 2 (4) ◽  
pp. 395-405 ◽  
Author(s):  
Adel Soroush ◽  
Wen Ma ◽  
Yule Silvino ◽  
Md. Saifur Rahaman
Keyword(s):  
Thin Film ◽  
Surface Modification ◽  
Graphene Oxide ◽  
Forward Osmosis ◽  
Graphene Oxide Nanosheets ◽  
Film Composite ◽  
Thin Film Composite

Antimicrobial thin film composite forward osmosis membrane is developed using silver-decorated graphene-oxide nanosheets coating.

scholarly journals Influence of Multidimensional Graphene Oxide (GO) Sheets on Anti-Biofouling and Desalination Performance of Thin-Film Composite Membranes: Effects of GO Lateral Sizes and Oxidation Degree

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2860
Author(s):  
Bárbara E. Rodríguez ◽  
María Magdalena Armendariz-Ontiveros ◽  
Rodrigo Quezada ◽  
Esther A. Huitrón-Segovia ◽  
Humberto Estay ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Size Distribution ◽  
Functional Groups ◽  
Water Flow ◽  
Size Group ◽  
Polymerization Reaction ◽  
Medium Size ◽  
Film Composite ◽  
Thin Film Composite

The influence of the lateral size and the content of graphene oxide (GO) flakes in specific oxygenate functional groups on the anti-biofouling properties and performance of thin-film composite membrane (TFC) was studied. Three different multidimensional GO samples were prepared with small (500–1200 nm), medium (1200–2300 nm), and large (2300–3600 nm) size distribution, and with different degrees of oxidation (GO3 > GO2 > GO1), varying the concentration of the hydrogen peroxide amount during GO synthesis. GO1 sheets’ length have a heterogeneous size distribution containing all size groups, whilst GO2 is contained in a medium-size group, and GO3 is totally contained within a small-size group. Moreover, GO oxygenate groups were controlled. GO2 and GO3 have hydroxyl and epoxy groups at the basal plane of their sheets. Meanwhile, GO1 presented only hydroxyl groups. GO sheets were incorporated into the polyamide (PA) layer of the TFC membrane during the interfacial polymerization reaction. The incorporation of GO1 produced a modified membrane with excellent bactericidal properties and anti-adhesion capacity, as well as superior desalination performance with high water flow (133% as compared with the unmodified membrane). For GO2 and GO3, despite the significant anti-biofouling effect, a detrimental impact on desalination performance was observed. The high content of large sheets in GO2 and small sheet stacking in GO3 produced an unfavorable impact on the water flow. Therefore, the synergistic effect due to the presence of large- and small-sized GO sheets and high content of OH-functional groups (GO1) made it possible to balance the performance of the membrane.

Fabrication of BaSO4-based mineralized thin-film composite polysulfone/polyamide membranes for enhanced performance in a forward osmosis process

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79774-79782 ◽  
Author(s):  
Haiyang Jin ◽  
Yangbo Huang ◽  
Hao Li ◽  
Ping Yu ◽  
Yunbai Luo
Keyword(s):  
Thin Film ◽  
Barium Sulfate ◽  
Forward Osmosis ◽  
Film Composite ◽  
Thin Film Composite ◽  
Polyamide Membranes

BaSO4-based mineralized thin-film composite (TFC) forward osmosis (FO) membranes were fabricated by depositing barium sulfate on the surface of prepared polysulfone/polyamide (PSf/PA) membranes by adopting an approach named surface mineralization.

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