Degradation of full aromatic polyamide NF membrane by sulfuric acid and hydrogen halides: Change of the surface/permeability properties

Jun, Byung-Moon; Lee, Hyung Kae; Kwon, Young‐Nam

doi:10.1016/j.polymdegradstab.2019.02.008

Cited by 36 publications

(17 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was reported that the electron delocalization between the N atom in amide bond and the π CO bond of the carbonyl group is essential to the stability of amide bond . Strong acids can protonate the N or O atom of an amide group, which significantly decreases the stability of the amide bond. , Ma et al investigated the reaction mechanism between the acid and amide bond and summarized five hydrolysis steps of PA as shown in Figure …”

Section: Effect Of Cleaning Agents On Nf Membranementioning

confidence: 99%

“…Owing to the lower energy barrier, the hydrolysis reaction of the piperazine-trimesoyl chloride (PIP-TMC) NF membrane occurs at pH < 2, and thus, the PIP-TMC membrane has weaker acid resistance than the m-phenylenediamine-TMC (MPD-TMC) one . Jun et al claimed that the MPD-TMC NF membrane showed good acid resistance, and the skin layer was merely compacted at pH 0 due to hydrogen bond distortion, which led to a flux decline . While the PIP-TMC membrane was hydrolyzed at pH 0.25, resulting in an increase of surface negative charge and permeate flux, and the skin layer peeled off eventually .…”

Section: Effect Of Cleaning Agents On Nf Membranementioning

confidence: 99%

“…Despite the high cleaning efficiency, frequent chemical cleaning would cause reversible/irreversible changes in the physical and chemical properties of NF membranes, resulting in membrane damage and deterioration of separation performance. − Therefore, in order to avoid the detrimental effect of chemical cleaning on a NF membrane, especially the PA skin layer, it is necessary to understand the interaction mechanisms of cleaning agents with NF membranes. However, almost all the studies only focused on the effect of a single cleaning agent on the membrane properties and performance; they lack systematical summaries of the mechanisms/effects of chemical cleaning on membrane and fouling.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

How Do Chemical Cleaning Agents Act on Polyamide Nanofiltration Membrane and Fouling Layer?

Huang

Luo

Chen

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Nanofiltration (NF) membranes, especially polyamide (PA) ones, are widely applied in water treatment, food processing, and resource recovery thanks to their excellent separation selectivity to small solutes and high water permeability. However, membrane fouling is inevitable during the long-term operation and limits the large-scale applications of NF technology. Chemical cleaning is considered the most effective way to avoid fouling aggravation and quickly restore membrane permeability on site. However, frequent chemical cleaning would cause reversible/ irreversible changes in the physical and chemical properties of NF membranes, resulting in membrane damage and deterioration of separation performance. Moreover, the PA NF membrane with high selectivity and a relatively low cross-linking degree is more sensitive to chemical cleaning. Many efforts, therefore, have been dedicated to clarifying the effect of chemical cleaning on the NF membrane properties and its separation performance. This review summarizes recent developments in the field and epitomizes the synergistic/inhibitory effect among the chemical cleaning agents on the fouling removal. Besides the practical guides for chemical cleaning of the PA NF membrane, many opportunities to advance the field are also pointed out.

show abstract

Section: Effect Of Cleaning Agents On Nf Membranementioning

confidence: 99%

Section: Effect Of Cleaning Agents On Nf Membranementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

How Do Chemical Cleaning Agents Act on Polyamide Nanofiltration Membrane and Fouling Layer?

Huang

Luo

Chen

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Sulfuric acid did not cause any changes in the membrane, but hydrogen halides changed the physicochemical properties of the membrane. The results can be used in recycling and industrial processes [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Polymer Materials Exposed to Aging in the Swimming Pool: Focus on Properties That Assure Comfort and Durability

Čubrić

Matković

2021

Polymers

View full text Add to dashboard Cite

The degradation of polyamide (PA) and polyester (PES) polymers is under intense study due to growing concerns about the accumulation of plastics in soils and oceans. Previous studies confirm that ageing degrades PA and PES at the molecular level. However, researchers have not addressed the development of protocols for aging textile materials in swimming pools, and few data are available on the effects of aging on comfort and durability. This research addresses the development of the aging protocol for PA and PES swimwear materials, its implementation, and the evaluation of properties that assure comfort and durability after specific periods of exposure. The tests include microscopic analysis, tensile tests, determination of fluid transport phases and drying period. The results revealed changes in the surface of the material in terms of fibrillation (more pronounced after outdoor aging). There is a positive correlation between the exposure duration and the breaking force (R2 ranges from 0.85 to 0.98), with a stronger correlation for the PA materials. The decrease in breaking force due to aging is up to 40%, indicating significantly reduced durability. The change in breaking force follows the changes in mass (R2 = 0.867). In terms of comfort assurance, outdoor aging of materials should have a greater negative impact than indoor ageing.

show abstract

“…Nanofiltration (NF) membranes have been widely used to separate divalent ions, dyes, pharmaceutical compounds (PhACs), and natural organic matters [1,2]. Because NF membranes have physicochemical properties intermediate between those of ultrafiltration and reverse osmosis (RO) membranes, the separation mechanism of NF membranes has generally been explained on the basis of synergetic effects of both sieving and electrostatic interactions [3,4].…”

Section: Introductionmentioning

confidence: 99%

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

Jun

Yoon

Park

2019

Water

Self Cite

View full text Add to dashboard Cite

This research focused on the influence of post-treatment using alkali-catalyzed hydrolysis with a full-aromatic nanofiltration (NF) polyamide membrane and its application to the efficient removal of selected dyes. The post-treated membranes were characterized through Fourier transform infrared spectroscopy, goniometry, and zeta-potential analysis to analyze the treatment-induced changes in the intrinsic properties of the membrane. Furthermore, the changes in permeability induced by the post-treatment were evaluated via the measurement of water flux, NaCl rejection, and molecular weight cutoff (MWCO) under different pH conditions and post-treatment times. Major changes induced by the post-treatment in terms of physicochemical properties were the enhancement of permeability, hydrophilicity, and negative charge due to the hydrolysis of the membrane’s amide bonds. Four different dyes were selected as representative organic pollutants considering the MWCO of the post-treated membranes. Compared with the pristine NF membrane, membranes post-treated at pH 13.5 showed better water flux with similar rejection of the target dyes. On the basis of these results, the proposed post-treatment method for NF membranes can be applied to the removal of organic pollutants of various size.

show abstract

Degradation of full aromatic polyamide NF membrane by sulfuric acid and hydrogen halides: Change of the surface/permeability properties

Cited by 36 publications

References 47 publications

How Do Chemical Cleaning Agents Act on Polyamide Nanofiltration Membrane and Fouling Layer?

How Do Chemical Cleaning Agents Act on Polyamide Nanofiltration Membrane and Fouling Layer?

Behavior of Polymer Materials Exposed to Aging in the Swimming Pool: Focus on Properties That Assure Comfort and Durability

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

Contact Info

Product

Resources

About