Important Approaches to Enhance Reverse Osmosis (RO) Thin Film Composite (TFC) Membranes Performance

Mayyahi, Ahmed Al

doi:10.3390/membranes8030068

Cited by 36 publications

(16 citation statements)

References 113 publications

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“…Conventional reverse osmosis membranes are mainly thin film composite membranes prepared from different polymeric materials 2,3 . While the standard reaction for coating the barrier layer responsible for salt rejection is interfacial polymerization of aqueous amine and organic acyl chloride, the other method is plasma polymerization 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Selectivity enhancement of oxidative degraded reverse osmosis membrane by chitosan–tannic acid treatment

Raval

Modi

Dave

et al. 2022

J of Applied Polymer Sci

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Reverse osmosis membrane elements suffer oxidative degradation during operation thereby resulting in increased salt passage. The present article demonstrates the novel approach to bind a chitosan–tannic acid layer above the degraded reverse osmosis membrane to make a supramolecular assembly over loosened polyamide layer to increase the selectivity performance. Chitosan being naturally occurring linear polysaccharide, its biodegradability, nontoxicity, antimicrobial property make it a promising candidate for membrane surface modification. Tannic Acid functions as cross‐linking agent, contains many polyphenolic compound, and was found suitable to bind with chitosan and form a supramolecular layer over polyamide. The present article showed the increase in salt rejection upto 33.17% of oxidative degraded reverse osmosis membrane by chitosan–tannic acid treatment. The selectivity enhancement was significant in case of membrane modified with chitosan–tannic acid supramolecular assembly. The modified membranes exhibited lower leaching as compared to only tannic acid treated membrane. They were characterized for morphology, surface features and chemical structure by scanning electron micrographs, atomic force micrographs, Fourier transform infrared spectroscopy. Moreover, the differential scanning calorimetry analysis was done to evaluate the glass transition temperature of modified membrane. Stress–strain behavior of modified membranes were analyzed. This article proposes as novel approach to enhance the selectivity of degraded membrane.

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Section: Introductionmentioning

confidence: 99%

Selectivity enhancement of oxidative degraded reverse osmosis membrane by chitosan–tannic acid treatment

Raval

Modi

Dave

et al. 2022

J of Applied Polymer Sci

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“…In addition, the combination with antimicrobial materials into membranes also becomes an innovative potential solution to biofouling control mainly. For example, silver (Ag), titanium dioxide (TiO 2 ), graphene oxide (GO), iron (Fe), copper (Cu), Zinc (Zn), metal organic frameworks (MOFs), whose antibacterial properties are well known, have been incorporated into a wide variety of water filtration membranes [ 10 , 22 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Copper-Modified Polymeric Membranes for Water Treatment: A Comprehensive Review

et al. 2021

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In the last decades, the incorporation of copper in polymeric membranes for water treatment has received greater attention, as an innovative potential solution against biofouling formation on membranes, as well as, by its ability to improve other relevant membrane properties. Copper has attractive characteristics: excellent antimicrobial activity, high natural abundance, low cost and the existence of multiple cost-effective synthesis routes for obtaining copper-based materials with tunable characteristics, which favor their incorporation into polymeric membranes. This study presents a comprehensive analysis of the progress made in the area regarding modified membranes for water treatment when incorporating copper. The notable use of copper materials (metallic and oxide nanoparticles, salts, composites, metal-polymer complexes, coordination polymers) for modifying microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), forward osmosis (FO) and reverse osmosis (RO) membranes have been identified. Antibacterial and anti-fouling effect, hydrophilicity increase, improvements of the water flux, the rejection of compounds capacity and structural membrane parameters and the reduction of concentration polarization phenomena are some outstanding properties that improved. Moreover, the study acknowledges different membrane modification approaches to incorporate copper, such as, the incorporation during the membrane synthesis process (immobilization in polymer and phase inversion) or its surface modification using physical (coating, layer by layer assembly and electrospinning) and chemical (grafting, one-pot chelating, co-deposition and mussel-inspired PDA) surface modification techniques. Thus, the advantages and limitations of these modifications and their methods with insights towards a possible industrial applicability are presented. Furthermore, when copper was incorporated into membrane matrices, the study identified relevant detrimental consequences with potential to be solved, such as formation of defects, pore block, and nanoparticles agglomeration during their fabrication. Among others, the low modification stability, the uncontrolled copper ion releasing or leaching of incorporated copper material are also identified concerns. Thus, this article offers modification strategies that allow an effective copper incorporation on these polymeric membranes and solve these hinders. The article finishes with some claims about scaling up the implementation process, including long-term performance under real conditions, feasibility of production at large scale, and assessment of environmental impact.

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“…Generally, the main factors causing membrane fouling are pore blocking, pore constriction, foulant adsorption, and the formation of cake layers [ 10 , 15 ]. It is believed that improving the hydrophilicity of the membrane surface could reduce fouling [ 7 , 16 , 17 ]. Due to the enhancement in surface hydrophilicity, a hydration layer can be formed on the hydrophilic surface to reduce the adhesion of foulants, thus achieving the purpose of anti-fouling [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

A Dopamine/Tannic-Acid-Based Co-Deposition Combined with Phytic Acid Modification to Enhance the Anti-Fouling Property of RO Membrane

et al. 2021

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Reverse osmosis (RO) membranes are widely used in the field of water treatment. However, there are inevitably various fouling problems during long-term use. Surface engineering of RO membranes, such as hydrophilic modification, has attracted broad attention for improving the anti-fouling performance. In this work, we constructed a green biomimetic composite modification layer on the surface of polyamide membranes using a dopamine (DA)/tannic acid (TA) co-deposited layer to bridge the polyamide surface and hydrophilic phytic acids (PhA). The DA/TA interlayer could firmly adhere to the RO membranes, reducing the aggregation of DA and providing abundant phenolic hydroxyl sites to graft PhA. Meanwhile, the anchored PhA molecule bearing six phosphate groups could effectively improve the superficial hydrophilicity. The membranes were characterized by the SEM, AFM, XPS, water contact angle test, and zeta potential test. After surface modification, the hydrophilicity, smoothness, and surface electronegativity were enhanced obviously. The flux and rejection of the virgin membrane were 76.05 L·m−2·h−1 and 97.32%, respectively. While the modified D2/T4-PhA membrane showed decent permeability with a water flux of 57.37 L·m−2·h−1 and a salt rejection of 98.29%. In the dynamic fouling test, the modified RO membranes demonstrated enhanced anti-fouling performance toward serum albumins (BSA), sodium alginates (SA), and dodecyl trimethyl ammonium bromides (DTAB). In addition, the modified membrane showed excellent stability in the 40 h long-term test.

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Important Approaches to Enhance Reverse Osmosis (RO) Thin Film Composite (TFC) Membranes Performance

Cited by 36 publications

References 113 publications

Selectivity enhancement of oxidative degraded reverse osmosis membrane by chitosan–tannic acid treatment

Selectivity enhancement of oxidative degraded reverse osmosis membrane by chitosan–tannic acid treatment

Copper-Modified Polymeric Membranes for Water Treatment: A Comprehensive Review

A Dopamine/Tannic-Acid-Based Co-Deposition Combined with Phytic Acid Modification to Enhance the Anti-Fouling Property of RO Membrane

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