Channel regulation of TFC membrane with hydrophobic carbon dots in forward osmosis

2021 ◽  
Author(s):  
Zongju Zhang ◽  
Jiugang Hu ◽  
Shijun Liu ◽  
Xin Hao ◽  
Lin Li ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Forward Osmosis ◽  
Channel Regulation ◽  
Tfc Membrane

scholarly journals Modification of Nanofiber Support Layer for Thin Film Composite forward Osmosis Membranes via Layer-by-Layer Polyelectrolyte Deposition

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 70 ◽  
Author(s):  
Ralph Gonzales ◽  
Myoung Park ◽  
Leonard Tijing ◽  
Dong Han ◽  
Sherub Phuntsho ◽  
...  
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Forward Osmosis ◽  
Composite Membranes ◽  
Structural Parameter ◽  
Layer By Layer ◽  
Film Composite ◽  
Thin Film Composite ◽  
Layer Deposition ◽  
Tfc Membrane

Electrospun nanofiber-supported thin film composite membranes are among the most promising membranes for seawater desalination via forward osmosis. In this study, a high-performance electrospun polyvinylidenefluoride (PVDF) nanofiber-supported thin film composite (TFC) membrane was successfully fabricated after molecular layer-by-layer polyelectrolyte deposition. Negatively-charged electrospun polyacrylic acid (PAA) nanofibers were deposited on electrospun PVDF nanofibers to form a support layer consisted of PVDF and PAA nanofibers. This resulted to a more hydrophilic support compared to the plain PVDF nanofiber support. The PVDF-PAA nanofiber support then underwent a layer-by-layer deposition of polyethylenimine (PEI) and PAA to form a polyelectrolyte layer on the nanofiber surface prior to interfacial polymerization, which forms the selective polyamide layer of TFC membranes. The resultant PVDF-LbL TFC membrane exhibited enhanced hydrophilicity and porosity, without sacrificing mechanical strength. As a result, it showed high pure water permeability and low structural parameter values of 4.12 L m−2 h−1 bar−1 and 221 µm, respectively, significantly better compared to commercial FO membrane. Layer-by-layer deposition of polyelectrolyte is therefore a useful and practical modification method for fabrication of high performance nanofiber-supported TFC membrane.

scholarly journals Thin Film Composite Forward Osmosis Membrane with Single-Walled Carbon Nanotubes Interlayer for Alleviating Internal Concentration Polarization

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 260 ◽  
Author(s):  
Yuanyuan Tang ◽  
Shan Li ◽  
Jia Xu ◽  
Congjie Gao
Keyword(s):  
Thin Film ◽  
Concentration Polarization ◽  
Water Flux ◽  
Forward Osmosis ◽  
Feed Solution ◽  
Film Composite ◽  
Thin Film Composite ◽  
Internal Concentration ◽  
Tfc Membrane ◽  
Internal Concentration Polarization

This study reported a series of thin film composite (TFC) membranes with single-walled nanotubes (SWCNTs) interlayers for the forward osmosis (FO) application. Pure SWCNTs with ultrahigh length-to-diameter ratio and without any functional group were applied to form an interconnect network interlayer via strong π-π interactions. Compared to the TFC membrane without SWCNTs interlayer, our TFC membrane with optimal SWCNTs interlayer exhibited more than three times the water permeability (A) of 3.3 L m−2h−1bar−1 in RO mode with 500 mg L−1 NaCl as feed solution and nearly three-fold higher FO water flux of 62.8 L m−2 h−1 in FO mode with the deionized water as feed solution and 1 M NaCl as draw solution. Meanwhile, the TFC membrane with SWCNTs interlayer exhibited significantly reduced membrane structure parameters (S) to immensely mitigate the effect of internal concentration polarization (ICP) in support layer with micro-sized pores in favor of higher water flux. It showed that the pure SWCNTs interlayer could be an effective strategy to apply in FO membranes.

scholarly journals Performance of the Pressure Assisted Forward Osmosis-MSF Hybrid Desalination Plant

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1245
Author(s):  
Daoud Khanafer ◽  
Sudesh Yadav ◽  
Namuun Ganbat ◽  
Ali Altaee ◽  
John Zhou ◽  
...  
Keyword(s):  
Forward Osmosis ◽  
Cellulose Triacetate ◽  
Permeation Flux ◽  
Membrane Process ◽  
Thermal Plant ◽  
Thin Film Composite ◽  
Feed Pressure ◽  
Multi Stage ◽  
Thermal Desalination ◽  
Tfc Membrane

An osmotically driven membrane process was proposed for seawater pretreatment in a multi-stage flashing (MSF) thermal plant. Brine reject from the MSF plant was the draw solution (DS) in the forward osmosis (FO) process in order to reduce chemical use. The purpose of FO is the removal of divalent ions from seawater prior the thermal desalination. In this study, seawater at 80 g/L and 45 g/L concentrations were used as the brine reject and seawater, respectively. The temperature of the brine reject was 40 °C and of seawater was 25 °C. Commercial thin-film composite (TFC) and cellulose triacetate (CTA) membranes were evaluated for the pretreatment of seawater in the FO and the pressure-assisted FO (PAFO) processes. Experimental results showed 50% more permeation flux by increasing the feed pressure from 1 to 4 bar, and permeation flux reached 16.7 L/m2h in the PAFO process with a TFC membrane compared to 8.3 L/m2h in the PAFO process with CTA membrane. TFC membrane experienced up to 15% reduction in permeation flux after cleaning with DI water while permeation flux reduction in the CTA membrane was >6%. The maximum recovery rate was 11.5% and 8.8% in the PAFO process with TFC and CTA membrane, respectively. The maximum power consumption for the pretreatment of seawater was 0.06 kWh/m3 and 0.1 kWh/m3 for the PAFO process with a TFC and CTA membrane, respectively.

scholarly journals Modification of Nanofiber Support Layer for Thin Film Composite Forward Osmosis Membranes via Layer-By-Layer Polyelectrolyte Deposition

2018 ◽  
Author(s):  
Ralph Rolly Gonzales ◽  
Myoung Jun Park ◽  
Leonard Tijing ◽  
Dong Suk Han ◽  
Sherub Phuntsho ◽  
...  
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Forward Osmosis ◽  
Composite Membranes ◽  
Structural Parameter ◽  
Layer By Layer ◽  
Film Composite ◽  
Thin Film Composite ◽  
Layer Deposition ◽  
Tfc Membrane

Electrospun nanofiber-supported thin film composite membranes are among the most promising membranes for seawater desalination via forward osmosis. In this study, a high-performance electrospun polyvinylidenefluoride (PVDF) nanofiber-supported TFC membrane was successfully fabricated after molecular layer-by-layer polyelectrolyte deposition. Negatively-charged electrospun polyacrylic acid (PAA) nanofibers were deposited on electrospun PVDF nanofibers to form a support layer consisted of PVDF and PAA nanofibers. This resulted to a more hydrophilic support compared to the plain PVDF nanofiber support. The PVDF-PAA nanofiber support then underwent a layer-by-layer deposition of polyethylenimine (PEI) and PAA to form a polyelectrolyte layer on the nanofiber surface prior to interfacial polymerization, which forms the selective polyamide layer of TFC membranes. The resultant PVDF-LbL TFC membrane exhibited enhanced hydrophilicity and porosity, without sacrificing mechanical strength. As a result, it showed high pure water permeability and low structural parameter values of 4.12 Lm−2h−1bar−1 and 221 µm, respectively, significantly better compared to commercial FO membrane. Layer-by-layer deposition of polyelectrolyte is therefore a useful and practical modification method for fabrication of high performance nanofiber-supported TFC membrane.

scholarly journals Aluminosilicate Nanotubes Embedded Polyamide Thin Film Nanocomposite Forward Osmosis Membranes with Simultaneous Enhancement of Water Permeability and Selectivity

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 879 ◽  
Author(s):  
She-Ji Shi ◽  
Ye-Han Pan ◽  
Shao-Fei Wang ◽  
Zheng-Wei Dai ◽  
Lin Gu ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Structural Parameters ◽  
High Surface ◽  
Forward Osmosis ◽  
Chloride Ions ◽  
Water Molecules ◽  
Broad Leaf ◽  
Tfc Membrane ◽  
Thin Film Nanocomposite

Nanocomposite membranes are strongly desired to break a trade-off between permeability and selectivity. This work reports new thin film nanocomposite (TFN) forward osmosis (FO) membranes by embedding aluminosilicate nanotubes (ANTs) into a polyamide (PA) rejection layer. The surface morphology and structure of the TFN FO membranes were carefully characterized by FTIR, XPS, FESEM and AFM. The ANTs incorporated PA rejection layers exhibited many open and broad “leaf-like” folds with “ridge-and-valley” structures, high surface roughness and relatively low cross-linking degree. Compared with thin film composite (TFC) membrane without ANTs, the TFN membrane with only 0.2 w/v% ANTs loading presented significantly improved FO water permeability, selectivity and reduced structural parameters. This promising performance can be mainly contributed to the special ANTs embedded PA rejection layer, where water molecules preferentially transport through the nanochannels of ANTs. Molecular dynamic simulation further proved that water molecules have much larger flux through the nanotubes of ANTs than sodium and chloride ions, which are attributed to the intrinsic hydrophilicity of ANTs and low external force for water transport. This work shows that these TFN FO membranes with ANTs decorated PA layer are promising in desalination applications due to their simultaneously enhanced permeability and selectivity.

scholarly journals New insights into the organic fouling mechanism of an in situ Ca2+ modified thin film composite forward osmosis membrane

RSC Advances ◽  
2019 ◽  
Vol 9 (65) ◽  
pp. 38227-38234 ◽  
Author(s):  
Xiujuan Hao ◽  
Shanshan Gao ◽  
Jiayu Tian ◽  
Songxue Wang ◽  
Huizhong Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Forward Osmosis ◽  
Organic Substances ◽  
Film Composite ◽  
Fouling Mechanism ◽  
Thin Film Composite ◽  
Organic Fouling ◽  
Tfc Membrane

In this study, the effect of organic substances on the fouling behavior of a thin film composite (TFC) membrane with in situ Ca2+ addition (TFC-Ca membrane) was evaluated.

Study on Nanocomposite Membranes with Enhanced Performance for Forward Osmosis

2014 ◽  
Vol 900 ◽  
pp. 191-196 ◽  
Author(s):  
Ning Ma ◽  
Cao Liu ◽  
Pei Jing Wang ◽  
Chu Yang Tang
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Water Flux ◽  
Forward Osmosis ◽  
Nanoporous Materials ◽  
Nanocomposite Membranes ◽  
Membrane Performance ◽  
Thin Film Composite ◽  
Internal Concentration ◽  
Tfc Membrane

Nanocomposite membranes with enhanced performance were investigated for forward osmosis (FO) by incorporation of nanoporous materials. The incorporation of zeolite into both polysulfone (PSf) substrates and polyamide (PA) rejection layer of thin film composite (TFC) membrane (PSf-TFC) could effectively improve FO membrane performance. In the case of zeolite loading into PA layer, the resulted PSf based thin film nanocomposite (PSf-TFN) membrane showed improved but limited water permeability of the rejection layer, corresponding to ~1.76 times water flux higher than PSf-TFC membrane. Significantly, the polysulfone nanocomposite (PSfN) based TFC membrane (PSfN-TFC), which formed by embedding zeolite nanoparticles in PSf substrates, not only enhanced water permeability of the polyamide rejection layer but also reduced internal concentration polarization (ICP) effect, and thus improved FO membrane performance significantly, which corresponding to ~2.50 times water flux higher than PSf-TFC membrane.

scholarly journals Preparation of thin-film composite membranes supported with electrospun nanofibers for desalination by forward osmosis

2020 ◽  
Vol 13 (2) ◽  
pp. 51-57
Author(s):  
Mustafa Al-Furaiji ◽  
Mohammed Kadhom ◽  
Khairi Kalash ◽  
Basma Waisi ◽  
Noor Albayati
Keyword(s):  
Thin Film ◽  
Water Flux ◽  
Applied Pressure ◽  
Forward Osmosis ◽  
Composite Membranes ◽  
Polymerization Reaction ◽  
Film Composite ◽  
Salt Rejection ◽  
Thin Film Composite ◽  
Tfc Membrane

Abstract. The forward osmosis (FO) process has been considered to be a viable option for water desalination in comparison to the traditional processes like reverse osmosis, regarding energy consumption and economical operation. In this work, a polyacrylonitrile (PAN) nanofiber support layer was prepared using the electrospinning process as a modern method. Then, an interfacial polymerization reaction between m-phenylenediamine (MPD) and trimesoyl chloride (TMC) was carried out to generate a polyamide selective thin-film composite (TFC) membrane on the support layer. The TFC membrane was tested in FO mode (feed solution facing the active layer) using the standard methodology and compared to a commercially available cellulose triacetate membrane (CTA). The synthesized membrane showed a high performance in terms of water flux (16 Lm −2 h−1) but traded the salt rejection (4 gm−2 h−1) compared with the commercial CTA membrane (water flux = 13 Lm−2 h−1 and salt rejection = 3 gm−2 h−1) at no applied pressure and room temperature. Scanning electron microscopy (SEM), contact angle, mechanical properties, porosity, and performance characterizations were conducted to examine the membrane.

scholarly journals Preparation of TFC Membranes Supported with Elelctrospun Nanofibers for Desalination by Forward Osmosis

2020 ◽  
Author(s):  
Mustafa Al-Furaiji ◽  
Mohammed Kadhom ◽  
Khairi Kalash ◽  
Basma Waisi ◽  
Noor Albayati
Keyword(s):  
High Performance ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Applied Pressure ◽  
Forward Osmosis ◽  
Electrospinning Process ◽  
Water Desalination ◽  
Polymerization Reaction ◽  
Salt Rejection ◽  
Tfc Membrane

Abstract. Forward osmosis (FO) process has been considered as a viable option for water desalination in comparison to the traditional processes like reverse osmosis regarding the energy consumption and economical operation. In this work, polyacrylonitrile (PAN) nanofiber support layer was prepared using electrospinning process as a modern method. Then, an interfacial polymerization reaction between m-phenylenediamine (MPD) and trimesoyl chloride (TMC) was carried out to generate a polyamide selective thin film composite (TFC) membrane on the support layer. The TFC membrane was tested in FO mode (feed solution facing the active layer) using standard methodology and compared to a commercially available cellulose triacetate membrane (CTA). The synthesized membrane showed a high performance in terms of water flux (16 L m−2 h−1) but traded the salt rejection (4 g m−2 h−1) comparing with the commercially CTA membrane (water flux = 13 L m−2 h−1 and salt rejection = 3 g m−2 h−1) at no applied pressure and room temperature. Scanning electron microscopy (SEM), contact angle, mechanical properties, porosity, and performance characterizations were conducted to examine the membrane.

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