In situ study of diffusion and interaction of water and electrolyte solution in polyacrylonitrile (PAN) membrane using FTIR and two-dimensional correlation analysis

Tang, Beibei; Wu, Peiyi

doi:10.1016/j.vibspec.2008.10.005

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…Two-dimensional correlation spectroscopy (2D-CoS), based on a set of FTIR spectra in response to some external perturbations (e.g., pH, temperature, and oxidant concentration), can potentially reveal the sequential changes of different functional groups. , In recent years, 2D-FTIR CoS analysis has been successfully applied to study the interaction mechanisms of metals and nanomaterials , with various substrates such as macromolecules and bacteria . The method was also capable to resolve the dynamic diffusion process of water and CaCl 2 in a polyacrilonitrile membrane . These inspiring studies prompted us to apply 2D-FTIR-CoS to characterize the dynamic aging process of membranes exposed to NaOCl.…”

Section: Introductionmentioning

confidence: 99%

“…27 The method was also capable to resolve the dynamic diffusion process of water and CaCl 2 in a polyacrilonitrile membrane. 28 These inspiring studies prompted us to apply 2D-FTIR-CoS to characterize the dynamic aging process of membranes exposed to NaOCl. It can be expected that the use of 2D-FTIR-CoS can provide a clearer picture on the degradation mechanisms of membranes during the exposure to NaOCl.…”

Section: ■ Introductionmentioning

confidence: 99%

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Unveiling the Susceptibility of Functional Groups of Poly(ether sulfone)/Polyvinylpyrrolidone Membranes to NaOCl: A Two-Dimensional Correlation Spectroscopic Study

Zhou

Huang

Xiong

et al. 2017

Environ. Sci. Technol.

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A clear understanding of membrane aging process is essential for the optimization of chemical cleaning in membrane-based facilities. In this study, two-dimensional (2D) Fourier transformation infrared (FTIR) correlation spectroscopy (CoS) analysis was first used to decipher the sequential order of functional group changes of NaOCl-aged poly(ether sulfone)/polyvinylpyrrolidone (PES/PVP) membranes. The synchronous maps showed 12 major autopeaks in total. Based on the asynchronous maps, a similar aging sequence of membrane groups was clearly identified at three pHs (i.e., 6, 8, and 10): 1463, 1440, and 1410 (cyclic C-H structures) > 1662 (amide groups) > 1700 (succinimide groups) > 1320, 1292 (S═O asymmetric) > 1486, 1580 (aromatic structures) > 1241 (aromatic ether bands) > 1105, 1150 cm (O═S═O symmetric). Among them, membrane chlorination occurred at 1241, 1410, and 1440 cm. Moreover, the initial degradation of PVP and the subsequent transformation of PES could be highly responsible for the increased water permeability and the enlargement of membrane pores, respectively, both leading to serious fouling with humic acid filtration. In summary, the 2D-FTIR-CoS analysis is a powerful approach to reveal the interaction mechanisms of NaOCl-membrane and could be also useful to probe the process of membrane fouling and chemical cleaning.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Unveiling the Susceptibility of Functional Groups of Poly(ether sulfone)/Polyvinylpyrrolidone Membranes to NaOCl: A Two-Dimensional Correlation Spectroscopic Study

Zhou

Huang

Xiong

et al. 2017

Environ. Sci. Technol.

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“…Therefore, the water molecules in MEG present a unique behavior of "fast absorption" and "slow diffusion". 41,42 By this way, distinct water gradient or ion concentration difference are spontaneously constructed between top absorbent surface and bottom barrier side for a long time, provoking a continuous and high electric output.…”

Section: Interaction Region Indicator (Iri) By Dft Calculation Furthe...mentioning

confidence: 99%

High-performance green moisture-electric generator based on supramolecular hydrogel with tens of milliamp electricity toward practical applications

Tao

Yang

Zhang³

et al. 2023

Preprint

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Scavenging sustainable energy from moisture has emerged as a promising green technology to achieve carbon neutrality in next-generation energy suppliers. Besides, ecofriendly materials used for moisture-electric generators (MEGs) can add significant contributions to alleviate carbon emission. Until now, it is still a grand challenge for MEGs as a direct power supply for practical applications due to low power density and intermittent electric output. Herewith, we design a green MEG with high direct-current (DC) power output by introducing polyvinyl alcohol-sodium alginate based supramolecular hydrogel as active material. A single unit can generate an enhanced power density of up to 0.11 mW cm− 2, a milliamp-scale short-circuit current density of ca. 1.31 mA cm− 2 and an open-circuit voltage of ca. 1.30 V under moisture stimuli and room temperature. Such outstanding electric generation is mainly attributed to enhanced moisture absorption and remained water gradient to initiate ample dissociable ions transport within supramolecular hydrogel network by theoretical calculation and experiments. Of practical importance, a record-breaking enlarged current of ca. 65 mA is achieved by an integrated MEG bank with parallel connection. The high-power-output and scalable MEGs offer sufficient energy to directly power many commercial electronics in real-life scenarios, such as charging smart watch, illuminating a household bulb, driving a digital clock for one month. This work broadens the application paradigm of MEGs and provides new insight for constructing green, high-performance and scalable MEGs as sustainable energy source for Internet-of-Things and wearable applications.

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“…Two distinct water species were detected by 2D correlation analysis. Tang and Wu [276] used 2D ATR-IR for the study of diffusion of water and aqueous CaCl 2 solution in poly(acrylonitrile) membrane. The role of different hydrogenbonding interactions was elucidated.…”

Section: Sorption Diffusion and Evaporation Processesmentioning

confidence: 99%

“…Mensitieri et al [277,278] studied the diffusion of water and CO 2 in polyimide. Tang et al [276] reported the diffusion of water and aqueous CaCl 2 solution in poly(acrylonitrile) membrane. Tang et al [279] studied the sorption and diffusion of water and electrolytes with different valency anions in positively charged polymer membranes with varying charge density.…”

Section: Synthetic Polymersmentioning

confidence: 99%

Two-dimensional correlation spectroscopy — Biannual survey 2007–2009

Noda

2010

Journal of Molecular Structure

107

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In situ study of diffusion and interaction of water and electrolyte solution in polyacrylonitrile (PAN) membrane using FTIR and two-dimensional correlation analysis

Cited by 12 publications

References 35 publications

Unveiling the Susceptibility of Functional Groups of Poly(ether sulfone)/Polyvinylpyrrolidone Membranes to NaOCl: A Two-Dimensional Correlation Spectroscopic Study

Unveiling the Susceptibility of Functional Groups of Poly(ether sulfone)/Polyvinylpyrrolidone Membranes to NaOCl: A Two-Dimensional Correlation Spectroscopic Study

High-performance green moisture-electric generator based on supramolecular hydrogel with tens of milliamp electricity toward practical applications

Two-dimensional correlation spectroscopy — Biannual survey 2007–2009

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