Surface modification of polyamide TFC membranes via redox‐initiated graft polymerization of acrylic acid

Ngo, Thu Hong Anh; Dinh, Khai; Tran, Dung Thi

doi:10.1002/app.45110

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…Additionally, Sakar et al [ 47 ] used dendrimer-based coatings to reduce fouling effects. Recently, Ngo et al [ 48 ] used redox initiated graft polymerization to coat TFC membrane with hydrophilic poly(acrylic acid). The coated membrane had lower roughness than the virgin one, and subsequently better fouling resistance and water flux was achieved.…”

Section: Modification Of Membrane Surfacementioning

confidence: 99%

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

Mayyahi

2018

Membranes

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Thin film composite (TFC) membrane, which consists of polyamide (PA) active film rests on porous support layer, has been the major type of reverse osmosis (RO) membrane since its development by Cadotte in the 1970s, and has been remarkably used to produce clean water for human consumption and domestic utilization. In the past 30 years, different approaches have been exploited to produce the TFC membrane with high water flux, excellent salt rejection, and better chlorine/fouling resistance. In this brief review, we classify the techniques that have been utilized to improve the RO-TFC membrane properties into four categories: (1) Using alternative monomers to prepare the active layer; (2) modification of membrane surface; (3) optimization of polymerization reactions; and (4) incorporation of nanoparticles (NPs) into the membrane PA layer. This review can provide insights to guide future research and further propel the RO TFN membrane.

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Section: Modification Of Membrane Surfacementioning

confidence: 99%

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

Mayyahi

2018

Membranes

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“…However, the broad complex band around 3300 cm −1 intensified due to the increase in the density of functional groups such as -OH, and C-H groups from GO and polymer (Figure 9b) [36]. Moreover, a new peak appeared at 1720 cm −1 confirming the incorporation of the carboxylic acid group (carbonyl, C=O) into the membrane from GO and PAA (Figure 9c) [37]. Figure 10 shows the Raman spectra of the RO and PAA-GO@RO optimized membrane.…”

Section: Membrane Surface Morphology and Functional Group Analysismentioning

confidence: 97%

“…Moreover, membrane surface properties also influence membrane fouling [42]. Most of the existing research has shown that the hydrophobic membrane is more prone to membrane fouling, and therefore, hydrophilization of the membrane is recommended to inhibit fouling [37,43]. Similarly, membrane smoothness also helps to prevent membrane fouling by not providing sites for foulant attachment [44].…”

Section: Inorganic Fouling Testmentioning

confidence: 99%

Optimization of Polyacrylic Acid Coating on Graphene Oxide-Functionalized Reverse-Osmosis Membrane Using UV Radiation through Response Surface Methodology

Ashfaq

Al-Ghouti

2022

Polymers

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Reverse osmosis (RO) is affected by multiple types of fouling such as biofouling, scaling, and organic fouling. Therefore, a multi-functional membrane capable of reducing more than one type of fouling is a need of the hour. The polyacrylic acid and graphene oxide (PAA-GO) nanocomposite functionalization of the RO membrane has shown its effectiveness against both mineral scaling and biofouling. In this research, the polyacrylic acid concentration and irradiation times were optimized for the PAA-GO-coated RO membrane using the response surface methodology (RSM) approach. The effect of these parameters on pure water permeability and salt rejection was investigated. The models were developed through the design of the experiment (DoE), which were further validated through the analysis of variance (ANOVA). The optimum conditions were found to be: 11.41 mg·L−1 (acrylic acid concentration) and 28.08 min (UV activation times) with the predicted results of 2.12 LMH·bar−1 and 98.5% NaCl rejection. The optimized membrane was prepared as per the model conditions, which showed an increase in both pure water permeability and salt rejection as compared to the control. The improvement in membrane surface smoothness and hydrophilicity for the optimized membrane also helped to inhibit mineral scaling by 98%.

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“…There are several methods for modifying the surface of NF membranes to achieve membrane fouling removal [ 29 ]. The methods available are UV photografting [ 30 ], plasma-assisted grafting [ 31 ], redox-initiated grafted polymerisation of acrylic acid [ 32 ] and embedding nanoparticles coupled with graphene oxide [ 33 ].…”

Section: Nanofiltration Membranementioning

confidence: 99%

Rejection Mechanism of Ionic Solute Removal by Nanofiltration Membranes: An Overview

et al. 2022

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The toxicity of heavy metals can cause water pollution and has harmful effects on human health and the environment. Various methods are used to overcome this pressing issue and each method has its own advantages and disadvantages. Membrane filtration technology such as nanofiltration (NF) produces high quality water and has a very small footprint, which results in lower energy usage. Nanofiltration is a membrane-based separation technique based on the reverse osmosis separation process developed in the 1980s. NF membranes have a pore size of 1 nm and molecular weight cut off (MWCO) of 300 to 500 Da. The properties of NF membranes are unique since the surface charge of the membranes is dependent on the functional groups of the membrane. The rejection mechanism of NF membrane is unique as it is a combination of various rejection mechanisms such as steric hindrance, electric exclusion, dielectric effect, and hydration mechanism. However, these mechanisms have not been studied in-depth due to their complexity. There are also many factors contributing to the rejection of NF membrane. Many junior researchers would face difficulty in studying NF membrane. Therefore, this paper is designed for researchers new to the field, and will briefly review the rejection mechanisms of NF membrane by both sieving and non-sieving separation processes. This mini-review aims to provide new researchers with a general understanding of the concept of the separation process of charged membranes.

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Surface modification of polyamide TFC membranes via redox‐initiated graft polymerization of acrylic acid

Cited by 14 publications

References 42 publications

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

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

Optimization of Polyacrylic Acid Coating on Graphene Oxide-Functionalized Reverse-Osmosis Membrane Using UV Radiation through Response Surface Methodology

Rejection Mechanism of Ionic Solute Removal by Nanofiltration Membranes: An Overview

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