High-Performance Reverse Osmosis CNT/Polyamide Nanocomposite Membrane by Controlled Interfacial Interactions

2014 ◽  
Vol 6 (4) ◽  
pp. 2819-2829 ◽  
Author(s):  
Hee Joong Kim ◽  
Kwonyong Choi ◽  
Youngbin Baek ◽  
Dong-Gyun Kim ◽  
Jimin Shim ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
High Performance ◽  
Nanocomposite Membrane ◽  
Interfacial Interactions

High-performance reverse osmosis nanocomposite membranes containing the mixture of carbon nanotubes and graphene oxides

2015 ◽  
Vol 3 (13) ◽  
pp. 6798-6809 ◽  
Author(s):  
Hee Joong Kim ◽  
Min-Young Lim ◽  
Kyung Hwa Jung ◽  
Dong-Gyun Kim ◽  
Jong-Chan Lee
Keyword(s):  
Carbon Nanotubes ◽  
Reverse Osmosis ◽  
High Performance ◽  
Polymeric Matrix ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes ◽  
Graphene Oxides ◽  
Synergistic Combinations

Nanocomposite membrane containing CNTs and GO exhibits considerably improved performances by the synergistic combinations of CNTs and GO, which can increase the dispersity in a polymeric matrix.

High Performance and Chlorine Resistant Carbon Nanotube/Aromatic Polyamide Reverse Osmosis Nanocomposite Membrane

MRS Advances ◽  
2016 ◽  
Vol 1 (20) ◽  
pp. 1469-1476 ◽  
Author(s):  
Rodolfo Cruz-Silva ◽  
Shigeki Inukai ◽  
Takumi Araki ◽  
Aaron Morelos-Gomez ◽  
Josue Ortiz-Medina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reverse Osmosis ◽  
High Performance ◽  
Mechanical Stability ◽  
Interfacial Polymerization ◽  
Polymer Network ◽  
Water Desalination ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes ◽  
Reverse Osmosis Membranes

ABSTRACTEfficient water desalination constitutes a major challenge for the next years and reverse osmosis membranes will play a key role to achieve this target. In this work, a high-performance reverse osmosis nanocomposite membrane was prepared by interfacial polymerization in presence of multiwalled carbon nanotubes. The effect of carbon nanotubes on the chlorine resistance, antifouling and desalination performance of the nanocomposite membranes was studied. We found that the addition of carbon nanotubes not only improved the membrane performance in terms of flow and antifouling, but also inhibited the chlorine degradation of these membranes. Several reports have acknowledged the benefits of adding carbon nanotubes to aromatic PA nanocomposite membranes, but little attention has been paid to the mechanisms related to the improvement of flow rate, selectivity and chlorine tolerance. We carried out a comprehensive study of the chemical and physical effects of carbon nanotubes on the fully crosslinked polyamide network. The chemical structure, chlorine resistance and membrane degradation was studied by several analytical techniques, permeation and fouling studies, whereas the microstructure of the nanocomposite was studied by small and wide angle X-ray scattering, high resolution transmission electron microscopy, and molecular dynamics. We found that the addition of the nanotube affects the interfacial polymerization, resulting in a polymer network with smaller pore size and higher sodium and chlorine rejection. We simulated the hydration of the membrane in seawater and found that the radial distribution function of water confined in the pores of the nanocomposite membrane exhibited smaller clusters of water molecules, thus suggesting a dense membrane structure. We analysed the network mobility and found that the nanotube provides mechanical stability to the polymer matrix. This study presents solid evidence towards more efficient and robust reverse osmosis membranes using carbon nanotubes as mechanical reinforcing and chlorine protection additive.

Facile Purification of Palygorskite and Its Effect on The Performance of Reverse Osmosis Thin Film Nanocomposite Membrane

2021 ◽  
Author(s):  
Stanley Chinedu Mamah ◽  
Pei Sean Goh ◽  
Ahmad Fauzi Ismail ◽  
Tijjani El‐badawy ◽  
Augustine Agi ◽  
...  
Keyword(s):  
Thin Film ◽  
Reverse Osmosis ◽  
Nanocomposite Membrane ◽  
Thin Film Nanocomposite

scholarly journals Recycling of Reverse Osmosis Concentrates to the Membrane Bioreactor in the MBR-RO Process for Water Reuse: effect on mbr performances

2017 ◽  
Vol 30 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Thi Thu Nga Vu ◽  
Manon Montaner ◽  
Christelle Guigui
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Water Reuse ◽  
High Performance ◽  
Membrane Bioreactor ◽  
Membrane System ◽  
Size Exclusion ◽  
Ro Concentrate ◽  
The Impact

Wastewater effluents can be treated by an integrated membrane system combining membrane bioreactor (MBR) and reverse osmosis (RO) for effective removal of micropollutants in the field of high-quality water reuse. However, discharging the RO concentrate waste stream directly into the natural environment could lead to serious problems due to the toxic components contained in the concentrates (micropollutants, salts, organic matter). A possible solution could be the recirculation of RO concentrate waste to the MBR. However, such an operation should be studied in detail since the recirculation of non-biodegradable organic matter or high concentrations of salts and micropollutants could directly or indirectly contribute to MBR membrane fouling and modification of the biodegradation activity. In this context, the work reported here focused on the recirculation of such concentrates in an MBR, paying specific attention to MBR membrane fouling. Lab-scale experiments were performed on a continuous MBR-RO treatment line with RO concentrate recirculation. The main goal was to determine the recovery of the RO unit and of the global process that maintained good process performance in terms of biodegradation and MBR fouling. The results demonstrate that the impact of the toxic flow on activated sludge depends on the recovery of the RO step but the same trends were observed regardless of the organic matter and salt contents of the concentrates: the concentration of proteins increased slightly. Size-exclusion high performance liquid chromatography (HPLC-SEC) was employed to study the effects of RO concentrate on the production of protein-like soluble microbial products (SMPs) and demonstrated a significant peak of protein-like substances corresponding to 10-100 kDa and 100-1 000 kDa molecules in the supernatant. Thus a significant increase in the propensity for sludge fouling was observed, which could be attributed to the increased quantity of protein-like substances. Finally, the effect of the concentrate on sludge activity was studied and no significant effect was observed on biodegradation, indicating that the return of the concentrate to the MBR could be a good alternative.

scholarly journals High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

2020 ◽  
Vol 8 (19) ◽  
pp. 9554-9566 ◽  
Author(s):  
Zhenzhen Zhang ◽  
Md. Mushfequr Rahman ◽  
Clarissa Abetz ◽  
Volker Abetz
Keyword(s):  
Small Molecules ◽  
High Performance ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes

An isoporous nanocomposite membrane is fabricated and displays the potential to separate small molecules with good antifouling and high permeance.

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.

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