Membranes based on polyacrylamide coatings on metallic meshes prepared by a two-steps redox polymerization. Performance for oil-water separation and biofouling effects

Cabrera, Jorge Nicolás; Rojas, Graciela; D’Accorso, Norma B.; Lizárraga, Leonardo; Negri, R. Martı́n

doi:10.1016/j.seppur.2020.116966

Cited by 21 publications

(11 citation statements)

References 41 publications

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“…Grafting, [180] coating, and acid-base treatment are the most widespread chemical methods used for membrane external surface modification, as shown in Figure 9a,b compared with Figure 9c for blending mentioned before. Because external physical treatment to surface modification for membranes includes but is not limited to plasma irradiation, ion beam irradiation, and vapor phase deposition techniques.…”

Section: External Treatment For Membrane Surface Modificationmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

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Section: External Treatment For Membrane Surface Modificationmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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“…Hence, scholars have made significant efforts and found that compared with the traditional oil–water separation materials, the superwetting separation materials demonstrate high purity, environmental protection, low cost, and simple operation for emulsion separation 11–13 . Considering these advantages, researchers have successfully formulated a few two‐dimensional (2D) superwetting separation materials, including metal‐mesh, fiber membranes, biological fabrics, and polymeric membranes, which can perform decent emulsion separation 14–17 . The accepted separation mechanism using these superwetting materials is a simple screening filtration mechanism, 18 wherein the oil and water phases have different surface tension on the pore of the separation material.…”

Section: Introductionmentioning

confidence: 99%

“…Considering these advantages, researchers have successfully formulated a few two-dimensional (2D) superwetting separation materials, including metal-mesh, fiber membranes, biological fabrics, and polymeric membranes, which can perform decent emulsion separation. [14][15][16][17] The accepted separation mechanism using these superwetting materials is a simple screening filtration mechanism, 18 wherein the oil and water phases have different surface tension on the pore of the separation material. Hence, the pore size of the separation material must be lower than the droplet size.…”

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confidence: 99%

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

et al. 2022

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Due to the trade‐off between purity and flux, the development of high‐purity, high‐flux oil–water separation materials is still an arduous challenge. Herein, to achieve emulsion separation with high purity and high permeability, fluorinated graphene/poly(vinyl alcohol) aerogel (FGPA) with strong honeycomb was obtained via a facile freeze‐drying method, and the separation mechanism was investigated via computational fluid dynamics (CFDs) simulation. The as‐prepared FGPA exhibited superhydrophobicity‐superoleophobicity and cyclic compression stability. Under the complex pore and superhydrophobicity, FGPA could separate water‐in‐oil emulsions with droplet sizes several times smaller than their own aperture only under gravity with ultrahigh flux (3255 L m−2 h−1) and ultrahigh purity (99.9%). Also, the separation process as visualized using simulations revealed that the vortex accelerates the demulsification behavior and promotes the gathering of water droplets rebounding on the superhydrophobic surface, so that the water droplets are intercepted. Therefore, FGPA has broad practical application potential in high‐flux and high‐purity oil–water emulsion separation.

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“…Polyacrylamide (PAM) is highly hydrophilic, which contains a large number of amino groups, and its coatings can be prepared without any additional organic solvents. [30,31] Silica (SiO 2 ) is one of the most commonly used inorganic particles to construct the surface with micro-nanostructures. Silica sol is a dispersion of nanoscale silica particles in water.…”

Section: Introductionmentioning

confidence: 99%

Degradable Superhydrophilic Iron‐Pillared Bentonite Doped with Polybutylene Adipate/Terephthalate Open‐Cell Foam: Its Application in Dye Degradation, Removal of Heavy Metal Ions, and Oil–Water Separation

Qiu

Phule

Zhong

et al. 2021

Macro Materials & Eng

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Development of industrialization has brought convenience to people's lives; however, it has also brought serious harm to the environment, where, water pollution is the most obvious. Here, a polybutylene adipate terephthalate (PBAT) open-cell foam doped with iron-pillared bentonite (IPB) is prepared by using sugar as a pore-forming agent and solution phase separation, and then combined with a solution dipping method to coat the foam surface with a polyacrylamide/SiO 2 , which makes the PBAT foam superhydrophilic. The static adsorption effect of superhydrophilic IPB-doped PBAT open-cell foam on methylene blue (MB) and Cu 2+ is studied. The adsorption isotherm fitting shows that the adsorption conforms to the Langmuir model and it has biased toward monolayer adsorption. The adsorption kinetics fitting confirms that the adsorption process is in line with the pseudo-second-order adsorption model, which is dominated by chemical adsorption. The modified PBAT open-cell foam has an adsorption effect on Cu 2+ ; however, it has weak cyclic adsorption capacity. It shows a good cyclic adsorption ability for the cationic dye MB and it has >95% photodegradation efficiency of the MB after five time's cyclic adsorption. The superhydrophilicity makes the foam to have better applications in oil-water separation.

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Membranes based on polyacrylamide coatings on metallic meshes prepared by a two-steps redox polymerization. Performance for oil-water separation and biofouling effects

Cited by 21 publications

References 41 publications

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Robust graphene/poly(vinyl alcohol) aerogel for high‐flux and high‐purity separation of water‐in‐oil emulsion and its computational fluid dynamic simulation

Degradable Superhydrophilic Iron‐Pillared Bentonite Doped with Polybutylene Adipate/Terephthalate Open‐Cell Foam: Its Application in Dye Degradation, Removal of Heavy Metal Ions, and Oil–Water Separation

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