Enhanced chlorine‐resistant and low biofouling reverse osmosis polyimide‐graphene oxide thin film nanocomposite membranes for water desalination

Hamdy, Gehad; El-Taher, Atef

doi:10.1002/pen.25495

Cited by 22 publications

(7 citation statements)

References 53 publications

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“…ISO 16,610 used a Gaussian L-Filtering of 2.0 m to remove long wavelengths from the signal. The hydrophilicity of the membrane was manually measured three times by calculating the contact angle between the two surfaces ( Hamdy and Taher, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Upgrading the preparation of high-quality chitosan from Procambarus clarkii wastes over the traditional isolation of shrimp chitosan

Omar

El-Masry

Eita

et al. 2022

Saudi Journal of Biological Sciences

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Section: Methodsmentioning

confidence: 99%

Upgrading the preparation of high-quality chitosan from Procambarus clarkii wastes over the traditional isolation of shrimp chitosan

Omar

El-Masry

Eita

et al. 2022

Saudi Journal of Biological Sciences

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“…HA rejection (R) outcomes have been estimated through monitoring HA quantities at 250 nm using a UV–vis spectrometer (Bio Quest CE2501), which would be shown by following equation [ 31, 32 ] :

R (() %) = \frac{C_{f} - C_{p}}{C_{f}} \times 100

…”

Section: Methodsmentioning

confidence: 99%

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Etemadi

Afsharkia

Zinatloo-Ajabshir

et al. 2021

Polymer Engineering & Sci

104

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In this work, the flexibility of polycarbonate (PC) membrane was improved by using polyurethane (PU) additive. However, due to the hydrophobic nature of the PU polymer, alumina (Al2O3) nanoparticles were incorporated to PC‐PU blend membrane. The prepared membranes have been used in a submerged membrane system to eliminate humic acid molecules from polluted water in both the presence and absence of coagulant (polyaluminum chloride). The obtained results showed that introduction of PU into PC membrane diminished hydrophilicity and enhanced porosity. Moreover, the flexibility of the PC membrane remarkably improved. Introduction of 1.5 wt% Al2O3 to the PC‐PU blend membrane led to enhancement in both porosity and hydrophilicity. Results of morphological studies showed that in the presence of Al2O3 nanostructures, finger‐shaped voids seemed to elongate across the entire thickness of the prepared membrane. Atomic force microscopy images showed that incorporation of PU and Al2O3 to the PC membrane resulted in a smoother surface. The antifouling performance of membranes revealed that the PC‐PU/Al2O3 nanocomposite membrane possessed the most favorable antifouling features owing to its lowest surface roughness as well as highest hydrophilicity. For all membranes utilizing coagulant (PAC), the irreversible fouling ratio and the flux recovery ratio significantly diminished and increased, respectively.

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“…TRP weakens the bond between foulants and the membrane surface, causing foulants to come out from the membrane and providing efficient membrane cleaning. 36 Physical cleaning and chemical cleaning are susceptible to membrane surface damage. TRP does not have this drawback as their structural change helps in foulant removal, a mild chemical for membrane matrix, and no harsh mechanical energy is required to remove foulants from the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐responsive polymer to clean fouled forward osmosis membrane after wastewater treatment: Excellent flux recovery

Rai,

Pandey,

Singh

et al. 2024

Polymer Engineering & Sci

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Thermally responsive polymers (TRPs) have gained significant attention in the past decade due to their unique phase transition behavior, those exhibiting changes in properties with temperature variations. In water, hydrophilic block copolymers form helical structures that can transform into hydrophobic globules above the lower critical solution temperature (LCST). Fouling is one of the limiting issues for the forward osmosis (FO) process in wastewater treatment. In this work, after the treatment of wastewater from the paper and pulp industries, foulants were removed from the surface of the commercial polyamide thin‐film composite membrane of the FO process using polyvinyl methyl ether (PVME), a TRP with an LCST of 35–37°C. PVME was mixed with different aqueous solutions to form cleaning solutions. Foulant cleaning experiments utilized a 1% PVME (w/v) solution in 300 mL of de‐ionized (DI) water, while 1 M NaCl solution served as the draw solution (DS) in the FO process. Comparing the water flux (J) and change in membrane hydraulic resistance (Rf) among pristine, fouled, and cleaned membranes revealed a 56.67% increase in water flux and a 51.68% decrease in membrane resistance after PVME mixed with DI water cleaning solution showcasing its effectiveness in improving membrane performance and reducing fouling. The cleaning efficiency of two solutions, that is, 1% PVME mixed in DI water and 1% PVME mixed in 1 M aqueous urea solution, is compared. Results showed that the former cleaning solution helped to obtain 32.62% higher water flux and 56.05% less membrane resistance. Various membrane characterizations are performed, such as field emission scanning electron microscopy (FE‐SEM), which characterizes the membrane's pore structure and surface morphology, while a contact angle analyzer assesses hydrophilicity. This research highlights the use of TRPs as effective cleaning agents, enhancing membrane performance by effectively removing foulants on the membrane surface. Investigating alternative cleaning solutions also provides insights for optimizing water treatment processes.Highlights Cleaning of fouled thin‐film composite membrane using thermal‐responsive polymers (TRPs). Polyvinyl methyl ether, a TRP with an lower critical solution temperature of 35–37°C used as a cleaning agent. 60% increase in water flux was observed after the single‐step cleaning process. Multiple uses of TRP for cleaning performed with no membrane damage.

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Enhanced chlorine‐resistant and low biofouling reverse osmosis polyimide‐graphene oxide thin film nanocomposite membranes for water desalination

Cited by 22 publications

References 53 publications

Upgrading the preparation of high-quality chitosan from Procambarus clarkii wastes over the traditional isolation of shrimp chitosan

Upgrading the preparation of high-quality chitosan from Procambarus clarkii wastes over the traditional isolation of shrimp chitosan

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Thermo‐responsive polymer to clean fouled forward osmosis membrane after wastewater treatment: Excellent flux recovery

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