scholarly journals Constructing Positively Charged Thin-Film Nanocomposite Nanofiltration Membranes with Enhanced Performance

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2526
Author(s):  
Wenyao Shao ◽  
Chenran Liu ◽  
Tong Yu ◽  
Ying Xiong ◽  
Zhuan Hong ◽  
...  
Keyword(s):  
Thin Film ◽  
Heavy Metal ◽  
Water Flux ◽  
Water Contact ◽  
Salt Rejection ◽  
Thin Film Composite ◽  
Charged Surfaces ◽  
Active Layers ◽  
Positively Charged ◽  
Thin Film Nanocomposite

Using polyethylenimine (PEI) as the aqueous reactive monomers, a positively charged thin-film nanocomposite (TFN) nanofiltration (NF) membrane with enhanced performance was developed by successfully incorporating graphene oxide (GO) into the active layer. The effects of GO concentrations on the surface roughness, water contact angle, water flux, salt rejection, heavy metal removals, antifouling property, and chlorine resistance of the TFN membranes were evaluated in depth. The addition of 20 ppm GO facilitated the formation of thin, smooth, and hydrophilic nanocomposite active layers. Thus, the TFN-PEI-GO-20 membrane showed the optimal water flux of 70.3 L·m−2·h−1 without a loss of salt rejection, which was 36.8% higher than the thin-film composite (TFC) blank membrane. More importantly, owing to the positively charged surfaces, both the TFC-PEI-blank and TFN-PEI-GO membranes exhibited excellent rejections toward various heavy metal ions including Zn2+, Cd2+, Cu2+, Ni2+, and Pb2+. Additionally, compared with the negatively charged polypiperazine amide NF membrane, both the TFC-PEI-blank and TFN-PEI-GO-20 membranes demonstrated superior antifouling performance toward the cationic surfactants and basic protein due to their hydrophilic, smooth, and positively charged surface. Moreover, the TFN-PEI-GO membranes presented the improved chlorine resistances with the increasing GO concentration.

IMPACTS OF HYDROPHILIC NANOFILLERS ON SEPARATION PERFORMANCE OF THIN FILM NANOCOMPOSITE REVERSE OSMOSIS MEMBRANE

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
C. Y. Chong ◽  
G. S. Lai ◽  
W. J. Lau ◽  
N. Yusof ◽  
P. S. Goh ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Water Desalination ◽  
Separation Performance ◽  
Salt Rejection ◽  
Tfc Membrane ◽  
Thin Film Nanocomposite

The membrane technology is still considered a costly method to produce potable water. In view of this, RO membrane with enhanced water permeability without trade-off in salt rejection is desirable as it could further reduce the cost for water desalination. In this study, thin film nanocomposite (TFN) membranes containing 0.05 or 0.10 w/v% hydrophilic nanofillers in polyamide layer were synthesized via interfacial polymerization of piperazine and trimesoyl chloride monomers. The resultant TFN membranes were characterized and compared with a control thin film composite (TFC) membrane. Results from the filtration experiments showed that TFN membranes exhibited higher water permeability, salt rejection and fouling resistance compared to that of the TFC membrane. Excessive amount of nanofillers incorporated in the membrane PA layer however negatively affected the cross-linking in the polymer matrix, thus deteriorating the membrane salt rejection. TFN membrane containing 0.05 w/v% of nanofillers showed better performances than the TFC membrane, recording a pure water flux of 11.2 L/m2∙h, and salt rejection of 95.4%, 97.3% and 97.5% against NaCl, Na2SO4 and MgSO4, respectively. 

scholarly journals Enhancing the performance of thin-film nanocomposite nanofiltration membranes using MAH-modified GO nanosheets

RSC Advances ◽  
2017 ◽  
Vol 7 (86) ◽  
pp. 54898-54910 ◽  
Author(s):  
Quanling Xie ◽  
Wenyao Shao ◽  
Shishen Zhang ◽  
Zhuan Hong ◽  
Qiuquan Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Maleic Anhydride ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Functionalized Graphene ◽  
Nanofiltration Membranes ◽  
Functionalized Graphene Oxide ◽  
Salt Rejection ◽  
Thin Film Nanocomposite

In this work, novel thin-film nanocompostie NF membranes were developed through modification with maleic anhydride functionalized graphene oxideviainterfacial polymerization, which showed the enhanced water flux with retaining high salt rejection.

scholarly journals Optimization of Aquaporin Loading for Performance Enhancement of Aquaporin-Based Biomimetic Thin-Film Composite Membranes

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 32
Author(s):  
Yang Zhao ◽  
Xuesong Li ◽  
Jing Wei ◽  
Jaume Torres ◽  
Anthony G. Fane ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Flux ◽  
Composite Membranes ◽  
Separation Performance ◽  
Scale Production ◽  
Film Composite ◽  
Salt Rejection ◽  
Thin Film Composite ◽  
Lipid Ratio ◽  
Wide Range

The aquaporin-based biomimetic thin-film composite membrane (ABM-TFC) has demonstrated superior separation performance and achieved successful commercialization. The larger-scale production of the ABM membrane requires an appropriate balance between the performance and manufacturing cost. This study has systematically investigated the effects of proteoliposome concentration, protein-to-lipid ratio, as well as the additive on the separation performance of ABM for the purpose of finding the optimal preparation conditions for the ABM from the perspective of industrial production. Although increasing the proteoliposome concentration or protein-to-lipid ratio within a certain range could significantly enhance the water permeability of ABMs by increasing the loading of aquaporins in the selective layer, the enhancement effect was marginal or even compromised beyond an optimal point. Alternatively, adding cholesterol in the proteoliposome could further enhance the water flux of the ABM membrane, with minor effects on the salt rejection. The optimized ABM not only achieved a nearly doubled water flux with unchanged salt rejection compared to the control, but also demonstrated satisfactory filtration stability within a wide range of operation temperatures. This study provides a practical strategy for the optimization of ABM-TFC membranes to fit within the scheme of industrial-scale production.

scholarly journals A Novel Thin-Film Nanocomposite Nanofiltration Membrane by Incorporating 3D Hyperbranched Polymer Functionalized 2D Graphene Oxide

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1253 ◽  
Author(s):  
Quanling Xie ◽  
Shishen Zhang ◽  
Hanjun Ma ◽  
Wenyao Shao ◽  
Xiao Gong ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Hyperbranched Polymer ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Three Dimensional ◽  
Salt Rejection ◽  
Antifouling Ability ◽  
Thin Film Nanocomposite

In order to develop a high-performance thin-film nanocomposite (TFN) nanofiltration (NF) membrane, the functionalized graphene-based nanomaterial (GO-HBE-COOH) was synthesized by combining two-dimensional graphene oxide (GO) with a three-dimensional hyperbranched polymer, which was used as the novel nanofiller and successfully embedded into the polypiperazine-amide (PPA) active layers on polysulfone (PSU) substrates via interfacial polymerization (IP) process. The resultant NF membranes were characterized using ATR-FTIR, SEM, and AFM, while their performance was evaluated in terms of water flux, salt rejection, antifouling ability, and chlorine resistance. The influence of GO-HBE-COOH concentration on the morphologies, properties, and performance of TFN NF membranes was investigated. With the addition of 60 ppm GO-HBE-COOH, the TFN-GHC-60 NF membrane exhibited the optimal water flux without a sacrifice of the salt rejection. It was found that the introduction of GO-HBE-COOH nanosheets favored the formation of a thinner and smoother nanocomposite active layer with an enhanced hydrophilicity and negative charge. As a result, TFN NF membranes demonstrated a superior permeaselectivity, antifouling ability, and chlorine resistance over the conventional PPA thin-film composite (TFC) membranes.

scholarly journals Layer-by-Layer Assembly of Graphene Oxide Nanoplatelets Embedded Desalination Membranes with Improved Chlorine Resistance

2019 ◽  
Author(s):  
Mahsa Abbaszadeh ◽  
Daniel Krizak ◽  
Santanu Kundu
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Water Flux ◽  
Surface Characteristics ◽  
Water Desalination ◽  
Layer By Layer ◽  
Water Contact ◽  
Salt Rejection ◽  
Dead End ◽  
Better Than

Membranes with polyamide thin film active layer are used in reverse osmosis based water desalination applications. Incorporation of graphene oxide nanoplatelets (GONPs) in the polyamide layer can alter the surface characteristics, permeability, selectivity, and can enhance the chlorine resistance of these membranes. In this study, a layer-by-layer (LbL) synthesis technique has been developed for embedding GONPs in polyamide layer. Polyamide layers with GONPs were synthesized in various sequences, such as alternating layers of GONPs and polyamide, and GONPs on top of the polyamide layer. Incorporation of GONPs resulted in an increase of surface hydrophilicity, as captured by the change of the water contact angle. Water flux and salt rejection properties of synthesized membranes have been investigated by using a dead-end cell. The salt rejection ability of membranes increased slightly with the incorporation of GONPs, while the water flux found to be similar to that observed for the pristine membranes without GONPs. Upon exposure to chlorine, GONPs embedded membranes retained salt rejection performance better than the pristine membranes. Our approach provides an alternative framework to incorporate nanoparticles in thin film membranes in a precise manner and to investigate the effect of such nanoparticles on the membrane performances.<br>

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.

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