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 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.

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 Facile Fabrication of High-Performance Thin Film Nanocomposite Desalination Membranes Imbedded with Alkyl Group-Capped Silica Nanoparticles

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1415
Author(s):  
Biqin Wu ◽  
Shuhao Wang ◽  
Jian Wang ◽  
Xiaoxiao Song ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Thin Film ◽  
Silica Nanoparticles ◽  
Brackish Water ◽  
Alkyl Group ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Water Desalination ◽  
High Concentration ◽  
Thin Film Nanocomposite

The advantages of thin film nanocomposite reverse osmosis (TFN-RO) membranes have been demonstrated by numerous studies within the last decade. This study proposes a facile and novel method to tune the microscale and nanoscale structures, which has good potential to fabricate high-performance TFN-RO membranes. This method involves the addition of alkyl capped silica nanoparticles (alkyl-silica NPs) into the organic phase during interfacial polymerization (IP). We discovered for the first time that the high concentration alkyl-silica NPs in organic solvent isopar-G can limit the diffusion of MPD molecules at the interface, therefore shaping the intrinsic thickness and microstructures of the PA layer. Moreover, the alkyl group modification greatly reduces the NPs agglomeration and increases the compatibility between the NPs and the PA matrix. We further demonstrate that the doping of alkyl-silica NPs impacts the performance of the TFN-RO membrane by affecting intrinsic thickness, higher surface area, hydrophobic plugging effect, and higher surface charge by a series of characterization. At brackish water desalination conditions (2000 ppm NaCl, 1.55 MPa), the optimal brackish water flux was 55.3 L/m2∙h, and the rejection was maintained at 99.6%, or even exceeded this baseline. At seawater desalination conditions (32,000 ppm NaCl, 5.5 MPa), the optimized seawater flux reached 67.7 L/m2∙h, and the rejection was sustained at 99.4%. Moreover, the boron rejection was elevated by 11%, which benefits from a hydrophobic plugging effect of the alkyl groups.

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.

scholarly journals Development of high-performance mixed matrix reverse osmosis membranes by incorporating aminosilane-modified hydrotalcite

RSC Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 5648-5655
Author(s):  
Xinxia Tian ◽  
Zhen Cao ◽  
Jian Wang ◽  
Jiangrong Chen ◽  
Yangyang Wei
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Reverse Osmosis ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Polymerization Process ◽  
Mixed Matrix ◽  
Thin Film Nanocomposite ◽  
Reverse Osmosis Membranes

Thin film nanocomposite reverse osmosis membranes were prepared by dispersing 3-aminopropyltriethoxysilane modified hydrotalcite in aqueous solution and incorporating the nanoparticles in polyamide layer during interfacial polymerization process.

scholarly journals Tuning the Surface Structure of Polyamide Membranes Using Porous Carbon Nitride Nanoparticles for High-Performance Seawater Desalination

Membranes ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 163 ◽  
Author(s):  
Zongyao Zhou ◽  
Xiang Li ◽  
Digambar B. Shinde ◽  
Guan Sheng ◽  
Dongwei Lu ◽  
...  
Keyword(s):  
Thin Film ◽  
Porous Carbon ◽  
Carbon Nitride ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
The State ◽  
Seawater Desalination ◽  
Covalent Bonds ◽  
Salt Rejection ◽  
Positive Effects

Enhancing the water flux while maintaining the high salt rejection of existing reverse osmosis membranes remains a considerable challenge. Herein, we report the use of a porous carbon nitride (C3N4) nanoparticle to potentially improve both the water flux and salt rejection of the state-of-the-art polyamide (PA) thin film composite (TFC) membranes. The organic–organic covalent bonds endowed C3N4 with great compatibility with the PA layer, which positively influenced the customization of interfacial polymerization (IP). Benefitting from the positive effects of C3N4, a more hydrophilic, more crumpled thin film nanocomposite (TFN) membrane with a larger surface area, and an increased cross-linking degree of PA layer was achieved. Moreover, the uniform porous structure of the C3N4 embedded in the ”ridge” sections of the PA layer potentially provided additional water channels. All these factors combined provided unprecedented performance for seawater desalination among all the PA-TFC membranes reported thus far. The water permeance of the optimized TFN membrane is 2.1-folds higher than that of the pristine PA-TFC membrane, while the NaCl rejection increased to 99.5% from 98.0%. Our method provided a promising way to improve the performance of the state-of-art PA-TFC membranes in seawater desalination.

scholarly journals Development of permeability properties of polyamide thin film composite nanofiltration membrane by using the dimethyl sulfoxide additive

2014 ◽  
Vol 4 (3) ◽  
pp. 174-181 ◽  
Author(s):  
Ahmad Akbari ◽  
Sayed Majid Mojallali Rostami
Keyword(s):  
Thin Film ◽  
Dimethyl Sulfoxide ◽  
Aqueous Phase ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Film Composite ◽  
Chemical Structures ◽  
Thin Film Composite

A novel polyamide thin film composite (PATFC) as a nanofiltration (NF) membrane was prepared by a modified interfacial polymerization (IP) reaction. Herein trimesoyl chloride and piperazine as the reagents, dimethyl sulfoxide (DMSO) as additive and polysulfone (PSF) ultrafiltration membrane as support were used respectively. The main goal of the present study is to improve TFC membrane water flux by addition of DMSO into the aqueous phase of IP reaction, without considerable rejection loss. Morphological, roughness, and chemical structures of the PATFC membrane were analyzed by scanning electron microscopy, atomic force microscopy (AFM), and Fourier transform infrared spectroscopy (FT-IR), respectively. The AFM analysis demonstrated that as DMSO was added to the aqueous phase, the surface roughness of PATFC membrane increased. Results showed that the pure water flux of modified-PATFC membranes increased up to 46%, compared to nonmodified-PATFC membrane, while salt rejection was not sacrificed considerably. The results elucidated that the addition of DMSO leads to an increase in the number of cross-linking bonds between monomers and pore diameter, which results in enhancement of the membrane flux. Finally, the results showed that the newly developed PATFC membrane is a high-performance NF membrane which augments the efficiency of conventional PATFC membrane.

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