scholarly journals Synthesis And Performance Of Thin Film Composite Nanofiltration Polyester Membrane For Removal Of Natural Organic Matter Substances

2012 ◽  
Vol 12 (1) ◽  
pp. 73
Author(s):  
N.A. Jalanni ◽  
M.N. Abu Seman ◽  
C.K. M Faizal
Keyword(s):  
Thin Film ◽  
Reaction Time ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Process Efficiency ◽  
Transmembrane Pressure ◽  
Film Composite ◽  
Thin Film Composite ◽  
And Performance ◽  
Straight Lines

Nanofiltration (NF) polyester thin-film composite (TFC) membranes have been prepared by interfacial polymerization using commercial polyethersulfone membrane support. At 6% (w/v) triethanolamine (TEAO) concentrations in the aqueous solution and a range of interfacial polymerization times in the organic solution containing trimesoyl chloride (TMC) were studied. Nanofiltration membranes were produced with varying properties through interfacial polymerization technique. The ability to use NF membranes with varying properties will improve overall process efficiency. This study has shown that through interfacial polymerization technique, the variation of reaction time as well as can affect the performance of the membrane produced. As a result, increasing the reaction time resulted in decreasing water permeabilities. Polyester with some amide group produced after interfacial polymerization occurred as shown by FT-IR spectra. Straight lines were obtained between Jw and ΔP and the water flux of distilled water shown that flux is directly proportional to transmembrane pressure (TMP). At low reaction time (5 min), the water flux has no significant effect on water permeance. So, the reaction time has a significant effect on the growth of thin film.

EFFECT OF PIPERAZINE (PIP) CONCENTRATION AND REACTION TIME ON THE FORMATION OF THIN FILM COMPOSITE FORWARD OSMOSIS (FO) MEMBRANE

2017 ◽  
Vol 79 (1-2) ◽  
Author(s):  
Mohammad Amirul Mohd Yusof ◽  
Mazrul Nizam Abu Seman
Keyword(s):  
Thin Film ◽  
Reaction Time ◽  
Humic Acid ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Forward Osmosis ◽  
Angle Measurement ◽  
Film Composite ◽  
Thin Film Composite

Nowadays, wide applications of forward osmosis (FO) technology have been huge attention in solving the water shortage problems. Hence, the performance of thin film composite (TFC) forward osmosis membrane via interfacial polymerization (IP) was studied. 2% and 1% w/v of piperazine (PIP) and 0.15% w/v of trimesoyl chloride (TMC) were reacted with 3 different reaction time (60s, 30s, and 10s). The fabricated membranes were then characterized by FTIR, contact angle measurement and FESEM. Pure water flux, humic acid rejection (represent NOM) and salt leakage were evaluated to obtain the best polyamide FO membrane. The results demonstrated that polyamide FO membranes fabricated with 2% w/v possess a higher hydrophilic properties compared to 1% w/v. In addition, regardless of monomer concentrations, at longest reaction time (60s), there is no significant change in water flux. Membrane fabricated at 60s of reaction time exhibited water flux of 1.90 LMH and 1.92 LMH for 2% w/v and 1% w/v of PIP concentrations, respectively. The same trend also observed for humic acid rejection (93.9%-94.6%). The salt leakage test revealed that the minimum salt reverse diffusion (0.01-0.02 GMH) could be achieved for membrane fabricated at longest reaction time of 60s for both PIP concentrations. As conclusion, manipulating monomer concentrations and reaction time is the main key to obtain an optimal polyamide layer with high membrane performance covering higher water flux, higher removal of humic acid and lower reverse salt diffusion.  

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.

scholarly journals Effect of the Formation of Ultrathin Selective Layers on the Structure and Performance of Thin-Film Composite Chitosan/PAN Membranes for Pervaporation Dehydration

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 153 ◽  
Author(s):  
Mariia Dmitrenko ◽  
Andrey Zolotarev ◽  
Tatiana Plisko ◽  
Katsiaryna Burts ◽  
Vladislav Liamin ◽  
...  
Keyword(s):  
Thin Film ◽  
Optimal Transport ◽  
Interfacial Polymerization ◽  
Contact Angles ◽  
Layer By Layer ◽  
Water Contact ◽  
Selective Layer ◽  
Film Composite ◽  
Thin Film Composite ◽  
And Performance

The aim of the study is to improve the performance of thin-film composite (TFC) membranes with a thin selective layer based on chitosan (CS) via different approaches by: (1) varying the concentration of the CS solution; (2) changing the porosity of substrates from polyacrylonitrile (PAN); (3) deposition of the additional ultrathin layers on the surface of the selective CS layer using interfacial polymerization and layer-by-layer assembly. The developed membranes were characterized by different methods of analyses (SEM and AFM, IR spectroscopy, measuring of water contact angles and porosity). The transport characteristics of the developed TFC membranes were studied in pervaporation separation of isopropanol/water mixtures. It was found that the application of the most porous PAN-4 substrate with combination of formation of an additional polyamide selective layer by interfacial polymerization on the surface of a dense selective CS layer with the subsequent layer-by-layer deposition of five bilayers of poly (sodium 4-styrenesulfonate)/CS polyelectrolyte pair led to the significant improvement of permeance and high selectivity for the entire concentration feed range. Thus, for TFC membrane on the PAN-4 substrate the optimal transport characteristics in pervaporation dehydration of isopropanol (12–90 wt.% water) were achieved: 0.22–1.30 kg/(m2h), 99.9 wt.% water in the permeate.

Tailoring the structure of polyamide thin film composite membrane with zwitterions to achieve high water permeability and antifouling property

RSC Advances ◽  
2015 ◽  
Vol 5 (120) ◽  
pp. 98730-98739 ◽  
Author(s):  
Xiaodan Weng ◽  
Yanli Ji ◽  
Fengyang Zhao ◽  
Quanfu An ◽  
Congjie Gao
Keyword(s):  
Thin Film ◽  
Protein Adsorption ◽  
Composite Membrane ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
High Water ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite

Zwitterionic membranes prepared via interfacial polymerization directly exhibit remarkably high water flux (80.3 L m−2 h−1) and protein adsorption resistance.

scholarly journals Removal of multiple pesticide residues from water by low-pressure thin-film composite membrane

2020 ◽  
Vol 10 (12) ◽  
Author(s):  
Ayan Mukherjee ◽  
Romil Mehta ◽  
Soumen Saha ◽  
A. Bhattacharya ◽  
Pabitra Kumar Biswas ◽  
...  
Keyword(s):  
Thin Film ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Size Exclusion ◽  
Film Composite ◽  
Thin Film Composite ◽  
Gas And Liquid Chromatography ◽  
Pass Through ◽  
Polyamide Membrane ◽  
Trimesoyl Chloride

AbstractThe study evaluated removal efficiency of 43 pesticides from water by thin-film composite polyamide membrane indigenously prepared by interfacial polymerization of 1,3-phenylenediamine and 1,3,5 trimesoyl chloride coated on asymmetric polysulfone support. Membrane performance was evaluated by gas and liquid chromatography mass spectroscopy determination of multiple pesticides remaining in feed and permeated water following the application of pesticides each @ 0.02, 0.05, and 0.10 mg/L in de-ionized water. The membrane was most efficient in the rejection of persistent organochlorine insecticides, viz. endosulfans (100%), dichlorodiphenyltrichloroethane (95%), and hexachlorocyclohexane (92%). Out of 43 selected pesticides, 33 were removed by > 80%. Size exclusion mass transfer played a significant role for molecules to pass through the membrane as observed for endosulfan isomers, endosulfan sulphate, and difenoconazole with molecular weight > 400. Pesticide rejection was also related to hydrophobicity (Log P). Hydrophobic pesticides with log P > 4.5 were rejected by > 80%, while monocrotophos with less hydrophobicity (log P = − 0.22) exhibited poor rejection (38%). Water flux decreased with an increase in pesticide concentration. The process of pesticide filtration was optimized at 200 psi. The results indicated the potential of the membrane to remove pesticides from water.

scholarly journals Performance of Acacia Gum as a Novel Additive in Thin Film Composite Polyamide RO Membranes

Membranes ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 30 ◽  
Author(s):  
Yehia Manawi ◽  
Viktor Kochkodan ◽  
Ahmad Ismail ◽  
Abdul Mohammad ◽  
Muataz Ali Atieh
Keyword(s):  
Thin Film ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Arabian Gulf ◽  
Film Composite ◽  
Thin Film Composite ◽  
Acacia Gum ◽  
Flux Decline ◽  
Scanning Electron ◽  
Reduced Surface

Novel thin film composite (TFC) polyamide (PA) membranes blended with 0.01–0.2 wt.% of Acacia gum (AG) have been prepared using the interfacial polymerization technique. The properties of the prepared membranes were evaluated using contact angle, zeta potential measurements, Raman spectroscopy, scanning electron microscopy, and surface profilometer. It was found that the use of AG as an additive to TFC PA membranes increased the membrane’s hydrophilicity (by 45%), surface charge (by 16%) as well as water flux (by 1.2-fold) compared with plain PA membrane. In addition, the prepared PA/AG membranes possessed reduced surface roughness (by 63%) and improved antifouling behavior while maintaining NaCl rejection above 96%. The TFC PA/AG membranes were tested with seawater collected from the Arabian Gulf and showed higher salt rejection and lower flux decline during filtration when compared to commercial membranes (GE Osmonics and Dow SW30HR). These findings indicate that AG can be used as an efficient additive to enhance the properties of TFC PA membranes.

Microporous carbon from fullerene impregnated porous aromatic frameworks for improving the desalination performance of thin film composite forward osmosis membranes

2018 ◽  
Vol 6 (24) ◽  
pp. 11327-11336 ◽  
Author(s):  
Xing Wu ◽  
Mahdokht Shaibani ◽  
Stefan J. D. Smith ◽  
Kristina Konstas ◽  
Matthew R. Hill ◽  
...  
Keyword(s):  
Thin Film ◽  
Organic Phase ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Forward Osmosis ◽  
Microporous Carbon ◽  
Film Composite ◽  
Thin Film Composite ◽  
Porous Aromatic Frameworks

Novel TFN-FO membranes with improved water flux have been synthesized by adding C60@PAF900 into the organic phase of interfacial polymerization.

Thin film composite reverse osmosis membranes prepared via layered interfacial polymerization

2017 ◽  
Vol 527 ◽  
pp. 121-128 ◽  
Author(s):  
Wansuk Choi ◽  
Sungkwon Jeon ◽  
Soon Jin Kwon ◽  
Hosik Park ◽  
You-In Park ◽  
...  
Keyword(s):  
Thin Film ◽  
Reverse Osmosis ◽  
Interfacial Polymerization ◽  
Film Composite ◽  
Thin Film Composite ◽  
Reverse Osmosis Membranes
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