scholarly journals Surface grafting of polyvinyl alcohol (PVA) cross-linked with glutaraldehyde (GA) to improve resistance to fouling of aromatic polyamide thin film composite reverse osmosis membranes using municipal membrane bioreactor effluent

2019 ◽  
Vol 14 (3) ◽  
pp. 614-624 ◽  
Author(s):  
Godwill Kasongo ◽  
Chad Steenberg ◽  
Bradley Morris ◽  
Gracia Kapenda ◽  
Nurah Jacobs ◽  
...  
Keyword(s):  
Surface Modification ◽  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Pure Water ◽  
Water Flux ◽  
Film Composite ◽  
Thin Film Composite ◽  
Flux Decline ◽  
Pure Water Flux ◽  
The Impact

Abstract Membrane surface modification is a favourable method to handle fouling during wastewater treatment processes. In this study, grafting of polyvinyl alcohol (PVA) through cross-link with Glutaraldehyde was applied to a thin film composite reverse osmosis membrane to enhance the resistance to flux decline. The analytical analyses attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and scanning electron microscopy were performed to evaluate the impact of surface modification. Biofouling using Escherichia coli (E. coli) bacterial solution and fouling tests using a bench scale reverse osmosis system with a simulated secondary effluent from a membrane bioreactor were used to assess the impact of the surface modification initiated on antifouling properties of the membrane. It was shown that the morphological structure and the chemical properties of the membrane were altered, whereas the pure water flux slightly decreased after modification. Although a slight decrease of salt rejection was observed, the membrane resistance to fouling improved and the biofouling model used revealed the anti-biofouling capacity of the membrane. The flux decline and flux recovery ratios improved with an increase in PVA concentration. The sterilization ratio increased from 33.8 to 36.8% and the pure water flux decline decreased from 46.04 to 25.94% after modification.

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 The Permeability and Selectivity of the Polyamide Reverse Osmosis Membrane were Significantly Enhanced by PhSiCl3

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 142
Author(s):  
Junjie Yu ◽  
Kaifeng Gu ◽  
Binbin Yang ◽  
Kaizhen Wang ◽  
Yong Zhou ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Pure Water ◽  
Polymer Network ◽  
Water Flux ◽  
Covalent Bond ◽  
Phenyl Group ◽  
Household Water ◽  
Water Salt ◽  
Pure Water Flux ◽  
Polyamide Film

The work briefly introduces the nano-composite reverse osmosis (RO) membrane with more permeability and selective performance, and we adopted the phenyltrichlorosilane precursor with better chemical stability and greater spatial resistance. The phenyltrichlorosilane concentration was mainly discussed in this work. The in-situ hydrolysis of phenyltrichlorosilane and the occurrence of ammonia hydrolysis make it effectively incorporated into the polyamide film. The covalent bond and hydrogen bond of phenyltrichlorosilane and polyamide (PA) can be realized. The phenyl group can extend in the polyamide polymer network and give the film corresponding functions. There will be fewer non-selective defects between phenyltrichlorosilane and PA. Under the premise of maintaining the water-salt selectivity of the membrane, along with the increase of benzene trichlorosilane loading, the 300% pure water flux can be achieved and the desalination rate remains at 98.1–98.9%. This reverse osmosis (RO) is suitable for household water purification.

A facile route to enhance the water flux of a thin-film composite reverse osmosis membrane: incorporating thickness-controlled graphene oxide into a highly porous support layer

2015 ◽  
Vol 3 (44) ◽  
pp. 22053-22060 ◽  
Author(s):  
Jaewoo Lee ◽  
Jun Hee Jang ◽  
Hee-Ro Chae ◽  
Sang H. Lee ◽  
Chung-Hak Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Single Layer Graphene ◽  
Reverse Osmosis Membrane ◽  
Porous Support ◽  
Film Composite ◽  
Thin Film Composite ◽  
Highly Porous

Incorporation of single-layer graphene oxide into a highly porous support layer provides a thin-film composite reverse osmosis membrane with superior water flux.

Influence of the sublayer structure of thin-film composite reverse osmosis membranes on the overall water flux

2018 ◽  
Vol 4 (12) ◽  
pp. 1912-1922 ◽  
Author(s):  
Jaewoo Lee ◽  
Hongsik Yoon ◽  
Jae Hyun Yoo ◽  
Dong-Chan Choi ◽  
Chang H. Nahm ◽  
...  
Keyword(s):  
Thin Film ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Film Composite ◽  
Thin Film Composite ◽  
Reverse Osmosis Membranes

The support layer of RO membranes can significantly affect the permeability depending on its sublayer structure.

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