Ultrafiltration membranes modified by PSS deposition and plasma treatment for Cr(VI) removal

Sandoval-Olvera, Ivette G.; González-Muñoz, Pilar; Palacio, Laura; Hernández, Antonio; Ávila-Rodríguez, Mario; Prádanos, Pedro

doi:10.1016/j.seppur.2018.08.023

Cited by 30 publications

(22 citation statements)

References 50 publications

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“…The lower active layer resistance for HFM-183+PSS+Ar agrees with the lower zeta potential (lower negative charge), as shown elsewhere [10] (see Table 1).…”

Section: Resultssupporting

confidence: 88%

“…The membranes were modified using a technique previously reported by us [10]. First, HFM-183 discs of a diameter of 50 mm were washed and 50 mL of a 20.8 g·L −1 aqueous solution of PSS was filtered immediately under a pressure of 8 bar.…”

Section: Methodsmentioning

confidence: 99%

“…Argon gas was fluxed at 0.30 cm 3 ·min −1 (volumes at standard temperature and pressure (STP)). A power of 10.2 W was used for 15 min, according to previously performed optimization measurements [10].…”

Section: Methodsmentioning

confidence: 99%

“…Both these approaches are very promising; therefore, the combination of these techniques may lead to an improvement and consolidation of the surface properties of PVDF membranes without the loss of their good properties. Recently, this procedure was followed with commercially-available ultrafiltration (UF) membranes made with PVDF (HFM-183, Koch Membrane Systems, Wilmington, MA, USA) by depositing sodium polystyrene sulfonate (PSS) and ulterior plasma treatment, leading to good chromate and phosphate retention [10]. Here, this modification procedure will be comprehensively characterized using many complimentary techniques applied to both the pristine and modified membranes to understand how these modifications cause retention improvements.…”

Section: Introductionmentioning

confidence: 99%

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Morphological, Electrical, and Chemical Characteristics of Poly(sodium 4-styrenesulfonate) Coated PVDF Ultrafiltration Membranes after Plasma Treatment

et al. 2019

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A commercial ultrafiltration (UF) membrane (HFM-183 de Koch Membrane Systems) made of poly(vinylidene fluoride) (PVDF), was recovered with a negatively-charged polyelectrolyte (poly(sodium 4-styrenesulfonate)) (PSS), and the effects on its electric, chemical, and morphological properties were analyzed. Atomic force microscopy (AFM), liquid–liquid displacement porometry, Electrical Impedance Spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy were used to investigate the modifications induced by the deposition of PSS on the PVDF positively-charged membrane and after its treatment by a radio frequency Ar-plasma. These techniques confirmed a real deposition and posterior compaction of PSS with increasing roughness and decreasing pore sizes. The evolution of the electric resistances of the membranes confirmed crosslinking and compaction with shielding of the sulfonated groups from PSS. In this way, a membrane with a negatively-charged active layer and a pore size which was 60% lower than the original membrane was obtained. The composition of the additive used by manufacturers to modify PVDF to make it positively charged was obtained by different procedures, all of which depended upon the results of X-ray photoelectron spectroscopy, leading to fairly consistent results. This polymer, carrying positive charges, contains quaternary nitrogen, as confirmed by XPS. Moreover, Raman spectroscopy confirmed that PVDF changes from mostly the β to the α phase, which is more stable as a substrate for the deposited PSS. The aim of the tested modifications was to increase the retention of divalent anions without reducing permeability.

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“…The lower active layer resistance for HFM-183+PSS+Ar agrees with the lower zeta potential (lower negative charge), as shown elsewhere [10] (see Table 1).…”

Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological, Electrical, and Chemical Characteristics of Poly(sodium 4-styrenesulfonate) Coated PVDF Ultrafiltration Membranes after Plasma Treatment

et al. 2019

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“…These methods include electrochemical methods, membrane ltration, ion exchange, chemical reduction/precipitation and adsorption. [2][3][4][5][6][7][8] However, their application on a large scale faces many drawbacks such as high cost, complexity, low efficiency and sludge generation. 9 On the other hand, owing to the simple procedure, cost-effectiveness, high efficiency, sludge free operation, potential for regeneration and environmental friendliness, the adsorption method has a great potential for the removal of Cr(VI), and thus has been attracting increasing attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

The development of a ternary nanocomposite for the removal of Cr(vi) ions from aqueous solutions

et al. 2019

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Simple approach for the plasma treatment of polymeric membranes and investigation of the aging effect

Marques

Silveira

Leite

et al. 2021

J of Applied Polymer Sci

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The modification of the surface characteristics after treatment with plasma in polymeric materials, such as the aging phenomenon, calls the attention of research in the area of nonthermal plasma technology. In this work, a direct treatment with dielectric-barrier discharge plasma was used on the surfaces of ultrafiltration membranes. The measurements of the contact angle with water, attenuated total reflectance accessory, zeta potential, atomic force microscopy and scanning electron microscopy-MEV were performed on the surfaces to verify changes after plasma treatment and to understand the occurrence and timing of the plasma aging effect. In the analysis of the membrane performance, hydraulic permeation and protein retention tests were performed. The results showed an improvement in wettability and hydrophilic properties in the post-treated membranes. The study of reversibility/aging of the postplasma surface is important for research that deals with the modification of polymeric membranes. Changes in surface morphology, topography and wettability of the membranes were observed up to seven days after treatment, with a tendency to return to the initial characteristics of the membranes.

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Ultrafiltration membranes modified by PSS deposition and plasma treatment for Cr(VI) removal

Cited by 30 publications

References 50 publications

Morphological, Electrical, and Chemical Characteristics of Poly(sodium 4-styrenesulfonate) Coated PVDF Ultrafiltration Membranes after Plasma Treatment

Morphological, Electrical, and Chemical Characteristics of Poly(sodium 4-styrenesulfonate) Coated PVDF Ultrafiltration Membranes after Plasma Treatment

The development of a ternary nanocomposite for the removal of Cr(vi) ions from aqueous solutions

Simple approach for the plasma treatment of polymeric membranes and investigation of the aging effect

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