Microfiltration/ultrafiltration polyamide-6 membranes for copper removal from aqueous solutions

El–Gendi, Ayman; Ali, Sahar S.; Abdalla, Heba; Saied, Marwa H.

doi:10.12989/mwt.2016.7.1.055

Cited by 19 publications

(11 citation statements)

References 35 publications

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“…The remaining pollutants flow from the UF stage, then it is introduced as feed to NF membrane unit to purify, reducing copper content from this wastewater stream and with a change of the source of wastewater. [75] Another hybrid system was proposed and studied flocculation as a suggested pretreatment. [76] That approach coupled with a downstream from zirconia MF membrane unit of pore size of about 0.2 mm, enhancing the treated water flux, and increasing its quality, compared by results from MF only.…”

Section: Membranes Combined With Conventional Treatmentmentioning

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: Membranes Combined With Conventional Treatmentmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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“…The characterization of prepared membranes was carried out using various analysis methods such as scanning electron microscopy (SEM), mechanical properties, porosity, and contact angle [13]. The pore size distribution of prepared membranes was determined using the Brunauer-Emmett-Teller (BET) method as in our previous work [9,12]. The evaluations of prepared membranes performances have been investigated using the homemade laboratory desalination testing unit Fig.…”

Section: Membrane Characterizationmentioning

confidence: 99%

“…The membrane is prepared by dissolving a suitable polymer such as cellulose acetate, Polyethersulfone (PES) polyamide (PA), Polyvinylalcohol (PVA), polyvinylpyrollidone (PVP) and polyethylene glycol (PEG) in a suitable additive as acetone, N-Methyl pyrrolidone (NMP) and formic acid. [9][10][11][12][13][14][15][16]. Approximately the most problems of membranes are membrane fouling which decrease the lifetime of membrane due to the need more excessive chemical treatment and shut down of the desalination unit.…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Coating Layer by Layer on Polyethersulfone Membranes for Desalination

El–Gendi

Mohamed

Shalaby³

2020

Egypt. J. Chem.

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Water Desalination is becoming an issue for saving the required potable and drinking water due to shrinkage of pure water. Thus, this work deals with antifouling membrane preparation using polymeric compounds of Polyethersulfone/ Polyvinylalcohol (PES/PVA) with nanomaterials to produce antifouling membrane for water desalination. The PES membrane has prepared by phase inversion process followed by different coating ways. The coating with PVA provided the highest hydrophilic surface. The characterization of prepared membranes was carried out using various analysis methods such as scanning electron microscopy (SEM), mechanical properties, porosity and contact angle. The pore size distribution of prepared membranes was determined using the Brunauer-Emmett-Teller (BET) method. The result showed that the best membrane performance has a coating with PVA layer, where rejection reached to 99 %, 95% and 88% as a function of concentration 500, 1500, and 3000 ppm respectively, while the permeate flux reached to 48.4 L/m2.h, 32.3 L/m2.h and 21.5 L/m2.h respectively.

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“…However, these two methods remain affordable and more scalable than other methods, such as membrane filtration technologies. 16 , 17 Membrane filtration technologies use passive exclusion methods or active electrodialysis to selectively remove ions from mixtures. 18 In addition to cost, membrane methods must also overcome other operational hurdles, such as pressure drop and fouling.…”

Section: Introductionmentioning

confidence: 99%

Fast and Reliable Synthesis of Melanin Nanoparticles with Fine-Tuned Metal Adsorption Capacities for Studying Heavy Metal Ions Uptake

Darwish¹,

Kalil²,

Alqahtani³

et al. 2021

NSA

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Purpose: Adsorption and uptake of heavy metals by polymeric nanoparticles is driven by a variety of physicochemical processes. In this work, we examined heavy metal uptake by synthetic melanin nanoparticles and analyzed physicochemical properties that affect the extent of metal uptake by the nanoparticles. Methods: Eumelanin nanoparticles were synthesized in a one-pot fast process from a 5,6-diacetoxy indole precursor that is hydrolyzed in situ into dihydroxy indole (DHI). The method allows the possibility of changing the level of sodium ions that ends up in the nanoparticles. Two variants of synthetic DHI-melanin (low-sodium and high sodium variants) were evaluated and demonstrated different relative adsorption efficiencies for heavy metal cations. Results and Discussion: For the low-sodium DHI-melanin and in terms of percentages of metal ion removal, the relative order of extraction from 50 ppm solutions was Zn 2+ > Cd 2+ > Ni 2+ > Co 2+ > Cu 2+ > Pb 2+ , with the extraction percentages ranging from 90% down to 76%, for a 30-minute adsorption time before equilibrium. The lower-sodium DHI-melanin consistently removed more Zn 2+ than the higher-sodium variant. Electron microscopy (SEM) showed an increase in melanin particle size after metal ions uptake. In addition, X-ray photoelectron spectroscopy (XPS) of DHI-melanin particles with depth profiling after Zn ions uptake supported particle swelling and ion transport within the particles. Conclusion: These initial studies showed the potential of this straightforward synthesis to obtain synthetic DHI-melanin nanoparticles similar to those from biological sources with the possibility to fine-tune their metal adsorption capacity. These synthetic nanoparticles can be used either for the removal of a variety of metal ions or to mimic and study mechanisms of metal uptake by melanin deriving from biological sources, with the potential to understand, for instance, differential heavy metal uptake by various melanic pigments.

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Microfiltration/ultrafiltration polyamide-6 membranes for copper removal from aqueous solutions

Cited by 19 publications

References 35 publications

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Hydrophilic Coating Layer by Layer on Polyethersulfone Membranes for Desalination

Fast and Reliable Synthesis of Melanin Nanoparticles with Fine-Tuned Metal Adsorption Capacities for Studying Heavy Metal Ions Uptake

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