Facile evaluation of coating thickness on membranes using ATR-FTIR

Bass, Maria; Freger, Viatcheslav

doi:10.1016/j.memsci.2015.05.059

Cited by 29 publications

(17 citation statements)

References 41 publications

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“…The minor variations in peak sizes did not follow a trend with the changing parameters. They were related to the heterogeneity in the sample x s, which are known to affect FTIR spectral intensities …”

Section: Resultsmentioning

confidence: 91%

Utilization of lentil flour as a biopolymer source for the development of edible films

Aydoğdu

Kırtıl

Şumnu

et al. 2018

J of Applied Polymer Sci

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Lentils are one of the cheapest and most nutritional protein sources for vegetarians. Our objective in this study was to evaluate the feasibility of using lentil flour as a raw material for the development of edible films and to investigate the effects of the glycerol concentration (C g 5 1%, 1.5%, and 2%) and process temperature (T p ; 70 and 90 8C) on the physical properties of these films. The films were characterized via their density; water solubility; thermal, morphological, and chemical characteristics; water vapor permeability (WVP); and tensile and optical properties. The lentil flour films were highly transparent and had lower water solubility values yet similar WVPs and mechanical properties compared to most other biodegradable films. An increase in C g led to the formation of more flexible films with increased hydrophilicity. A T p of 90 8C resulted in yellower, more transparent films with increased stiffness compared to a T p of 70 8C. In this study, lentil flour was shown to be an ideal source for edible film production. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46356.

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Section: Resultsmentioning

confidence: 91%

Utilization of lentil flour as a biopolymer source for the development of edible films

Aydoğdu

Kırtıl

Şumnu

et al. 2018

J of Applied Polymer Sci

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“…For deeply analyzing the result, the software of Peak Fit V4.12 was used for resolution of ATR‐IR spectra peaks and area calculation. In comparison to M ami ‐0, the intensity of the PSf characterized band (1585 cm −1 ) of M ami decreased after modified by EDA, indirectly indicating more PA was produced on membrane surface . To confirm this conclusion, the integral area ratios of characteristic peaks of PA and PSf were calculated to be as the index of the amount of PA. R = A 1663 + A 1610 + A 1545 /A 1585 (A represents the area of characterized bond) was used to represent the integral area ratio.…”

Section: Resultsmentioning

confidence: 91%

Surface modification of polyamide reverses osmosis membrane by phosphonic acid group with improved performance

Zhao

Dai

Zhang

et al. 2018

J of Applied Polymer Sci

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A facial method for preparing reverse osmosis polyamide (PA) membranes of excellent antifouling and separation performance was developed via covalently grafting phosphonic acid on membrane surface. First, a pristine PA layer was synthesized by interfacial polymerization between m-phenylenediamine and trimesoyl chloride. Then, a second interfacial reaction was implemented between ethylenediamine and the residual acryl chloride on the pristine PA layer, generating an active layer enriched by primary amine. Finally, the amine-rich surface treated by formaldehyde and phosphorous acid to produce a membrane surface modified by phosphonic acid groups. Surface characterization by attenuated total reflectance infrared, X-ray photoelectron spectroscopy and zeta-potential measurements illustrated the presence of phosphonic acid group. The lowest contact angle of modified membrane was 26 , demonstrating the membrane possessed an outstandingly wettable surface. The optimal separation performance was 88 L m −2 h −1 of water flux and 99.4% of salt rejection under 1.55 MPa. In addition, bovine serum albumin was used as organic foulant to measure the antifouling property of membranes. The result of dynamic fouling experiments indicated that the modified membrane exhibited better antifouling (of which the irreversible fouling degree was 7.1%) compared with commercial membrane BW30 (of which the irreversible fouling degree was 13.5%).

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“…The results indicate that the membrane surface was successfully and uniformly modified over the entire element, while contact angle data also showed a significant increase in surface hydrophobicity. A recently developed method for the quantitative evaluation of polymer coating thickness using ATR-FTIR showed that the average DG ~0.12 corresponds to an average grafted layer thickness of about 35 nm [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

In Situ Modification of Reverse Osmosis Membrane Elements for Enhanced Removal of Multiple Micropollutants

2019

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Reverse osmosis (RO) membranes are widely used for desalination and water treatment. However, they insufficiently reject some small uncharged micropollutants, such as certain endocrine-disrupting, pharmaceutically active compounds and boric acid, increasingly present in water sources and wastewater. This study examines the feasibility of improving rejection of multiple micropollutants in commercial low-pressure RO membrane elements using concentration polarization- and surfactant-enhanced surface polymerization. Low-pressure membrane elements modified by grafting poly(glycidyl methacrylate) showed enhanced rejection of all tested solutes (model organic micropollutants, boric acid, and NaCl), with permeability somewhat reduced, but comparable with commercial brackish water RO membranes. The study demonstrates the potential and up-scalability of grafting as an in situ method for improving removal of various classes of organic and inorganic micropollutants and tuning performance in RO and other dense composite membranes for water purification.

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Facile evaluation of coating thickness on membranes using ATR-FTIR

Cited by 29 publications

References 41 publications

Utilization of lentil flour as a biopolymer source for the development of edible films

Utilization of lentil flour as a biopolymer source for the development of edible films

Surface modification of polyamide reverses osmosis membrane by phosphonic acid group with improved performance

In Situ Modification of Reverse Osmosis Membrane Elements for Enhanced Removal of Multiple Micropollutants

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