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Preparation and characterization of thin-film composite membrane with nanowire-modified support for forward osmosis process.

Low ZX, Liu Q, Shamsaei E, Zhang X, Wang H - Membranes (Basel) (2015)

Bottom Line: In FO mode, the ratio of water flux to reverse solute flux was also improved.The result shows that Zn2GO4 nanowire may be used as a modifier to the substrate to improve the quality of the polyamide layer on the substrate to improve the flux and selectivity, but not as effective in reducing ICP.This work demonstrates that the incorporation of nanomaterials to the membrane substrate may be an alternative approach to improve the formation of polyamide skin layer to achieve better FO performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Monash University, Clayton VIC 3800, Australia.

ABSTRACT
Internal concentration polarization (ICP) in forward osmosis (FO) process is a characteristic problem for asymmetric thin-film composite (TFC) FO membrane which leads to lower water flux. To mitigate the ICP effect, modification of the substrates' properties has been one of the most effective methods. A new polyethersulfone-based ultrafiltration membrane with increased surface porosity and high water flux was recently produced by incorporating Zn2GeO4 nanowires. The composite membrane was used as a substrate for the fabrication of TFC FO membrane, by coating a thin layer of polyamide on top of the substrate. The substrate and the nanowires were characterized by a range of techniques such as SEM, XRD, and contact angle goniometry. The water permeability and molecular weight cut-offs (MWCO) of the substrate; and the FO performance of the TFC membrane were also determined. The Zn2GeO4-modified membrane showed ~45% increase in water permeability and NaCl salt rejection of 80% under RO mode. In FO mode, the ratio of water flux to reverse solute flux was also improved. However, lower FO flux was obtained which could be due to ICP. The result shows that Zn2GO4 nanowire may be used as a modifier to the substrate to improve the quality of the polyamide layer on the substrate to improve the flux and selectivity, but not as effective in reducing ICP. This work demonstrates that the incorporation of nanomaterials to the membrane substrate may be an alternative approach to improve the formation of polyamide skin layer to achieve better FO performance.

No MeSH data available.


Ultrafiltration (UF) performance, thickness, porosity and contact angle of pristine polyethersulfone (PES) membrane and Zn2GeO4/PES membrane.
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membranes-05-00136-f002: Ultrafiltration (UF) performance, thickness, porosity and contact angle of pristine polyethersulfone (PES) membrane and Zn2GeO4/PES membrane.

Mentions: Figure 2 shows the characteristics of the pristine UF membrane (pure PES) and Zn2GeO4/PES membrane. The modified membrane showed ~3.5 times higher pure water flux than control membrane and also slightly improved molecular weight cut off (MWCO). The increase in water flux is due to the increased number of pores in the active layer [32]. The porosity of the modified membrane remained almost the same as the control membrane. After incorporating Zn2GeO4 nanowires, the membrane also becomes slightly more hydrophilic as shown by the reduced contact angle. The modified membrane also showed a slight decrease in membrane thickness, which may be due to changes in polymer dope solution. The modified membrane was used as the substrate for TFC FO membrane. A thin layer of polyamide was formed via interfacial polymerization on top of the modified PES substrate.


Preparation and characterization of thin-film composite membrane with nanowire-modified support for forward osmosis process.

Low ZX, Liu Q, Shamsaei E, Zhang X, Wang H - Membranes (Basel) (2015)

Ultrafiltration (UF) performance, thickness, porosity and contact angle of pristine polyethersulfone (PES) membrane and Zn2GeO4/PES membrane.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384095&req=5

membranes-05-00136-f002: Ultrafiltration (UF) performance, thickness, porosity and contact angle of pristine polyethersulfone (PES) membrane and Zn2GeO4/PES membrane.
Mentions: Figure 2 shows the characteristics of the pristine UF membrane (pure PES) and Zn2GeO4/PES membrane. The modified membrane showed ~3.5 times higher pure water flux than control membrane and also slightly improved molecular weight cut off (MWCO). The increase in water flux is due to the increased number of pores in the active layer [32]. The porosity of the modified membrane remained almost the same as the control membrane. After incorporating Zn2GeO4 nanowires, the membrane also becomes slightly more hydrophilic as shown by the reduced contact angle. The modified membrane also showed a slight decrease in membrane thickness, which may be due to changes in polymer dope solution. The modified membrane was used as the substrate for TFC FO membrane. A thin layer of polyamide was formed via interfacial polymerization on top of the modified PES substrate.

Bottom Line: In FO mode, the ratio of water flux to reverse solute flux was also improved.The result shows that Zn2GO4 nanowire may be used as a modifier to the substrate to improve the quality of the polyamide layer on the substrate to improve the flux and selectivity, but not as effective in reducing ICP.This work demonstrates that the incorporation of nanomaterials to the membrane substrate may be an alternative approach to improve the formation of polyamide skin layer to achieve better FO performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Monash University, Clayton VIC 3800, Australia.

ABSTRACT
Internal concentration polarization (ICP) in forward osmosis (FO) process is a characteristic problem for asymmetric thin-film composite (TFC) FO membrane which leads to lower water flux. To mitigate the ICP effect, modification of the substrates' properties has been one of the most effective methods. A new polyethersulfone-based ultrafiltration membrane with increased surface porosity and high water flux was recently produced by incorporating Zn2GeO4 nanowires. The composite membrane was used as a substrate for the fabrication of TFC FO membrane, by coating a thin layer of polyamide on top of the substrate. The substrate and the nanowires were characterized by a range of techniques such as SEM, XRD, and contact angle goniometry. The water permeability and molecular weight cut-offs (MWCO) of the substrate; and the FO performance of the TFC membrane were also determined. The Zn2GeO4-modified membrane showed ~45% increase in water permeability and NaCl salt rejection of 80% under RO mode. In FO mode, the ratio of water flux to reverse solute flux was also improved. However, lower FO flux was obtained which could be due to ICP. The result shows that Zn2GO4 nanowire may be used as a modifier to the substrate to improve the quality of the polyamide layer on the substrate to improve the flux and selectivity, but not as effective in reducing ICP. This work demonstrates that the incorporation of nanomaterials to the membrane substrate may be an alternative approach to improve the formation of polyamide skin layer to achieve better FO performance.

No MeSH data available.