Deprotonated tannic acid regulating pyrrole polymerization to enhance nanofiltration performance for molecular separations under both aqueous and organic solvent environments

Zhang, Yanqiu; Yang, Fan; Qin, Songhe; Huang, Junhui; Yang, Xuyou; Wang, Wenguang; Wu, Chunrui; Shao, Lu

doi:10.1016/j.seppur.2022.121647

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…The water shortage is becoming a severe challenge to human survival and development with global climate change and population growth. − Membrane technology is a promising way to promote water supply and recycling. Nanofiltration is an attractive membrane process between ultrafiltration and reverse osmosis that has made great progress over the past years. − Owing to its advantages of relatively low operation pressure and high rejection to divalent ions, nanofiltration can find wide uses in drinking water purification, − seawater desalination, − and wastewater treatment. , As the core material of nanofiltration, the nanofiltration membranes are mostly in the form of a thin-film-composite (TFC) membrane that consists of an ultrathin selective layer on a porous support . The TFC nanofiltration membranes are industrially produced by interfacial polymerization between amine monomers in the aqueous phase and acyl chloride monomers in the organic phase .…”

Section: Introductionmentioning

confidence: 99%

Metal–Polyphenol Coordination at the Aqueous Contra-diffusion “Interface”: A Green Way to High-Performance Iron(III)/Tannic Acid Thin-Film-Composite Nanofiltration Membranes

Wang

Zhu

et al. 2022

Langmuir

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Thin-film-composite (TFC) nanofiltration membranes have found wide uses in environment remediation and industrial separation. There is a growing trend to avoid the use of organic solvents and toxic chemicals during membrane fabrication. Therefore, the aqueous fabrication of TFC membranes receives considerable interest as a green and sustainable process. However, it remains challenging to construct a defect-free and ultrathin film in a homogeneous aqueous phase without the assistance of an interface. The contra-diffusion process provides a special “interface” to confine the film formation within a narrow space by regulating the competition between precursor diffusion and interfacial reactions. Herein, Fe3+/tannic acid (TA) TFC membranes were fabricated by a contra-diffusion process. The effects of fabrication parameters on the Fe3+/TA TFC membrane microstructure and performance were also investigated. The negatively charged membrane performs a competitive Na2SO4 rejection of 95.6% with a permeation flux of 44.3 L m–2 h–1 under 0.6 MPa as well as more than 99.5% rejection to several anionic dyes. The as-prepared membranes perform superior nanofiltration performance compared to other reported Fe3+/TA-based membranes, owing to the thin and defect-free selective layers by self-regulation. Moreover, the membranes exhibit stable rejection during a long-term nanofiltration test.

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Section: Introductionmentioning

confidence: 99%

Metal–Polyphenol Coordination at the Aqueous Contra-diffusion “Interface”: A Green Way to High-Performance Iron(III)/Tannic Acid Thin-Film-Composite Nanofiltration Membranes

Wang

Zhu

et al. 2022

Langmuir

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“…Though efficient, RO requires a high operating pressure and consumes considerable energy [ 20 , 23 , 24 ]. In contrast, the operating pressure for nanofiltration is much lower, and with its small footprint, nanofiltration can be easily achieved with automatic control, making it suitable for use in many fields [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Membrane Fouling Control for Brackish Water Treatment Using a Modified Polyamide Composite Nanofiltration Membrane

et al. 2022

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In northwest China, the limited amount of water resources are classified mostly as brackish water. Nanofiltration is a widely applied desalination technology used for brackish water treatment; however, membrane fouling restricts its application. Herein, we modified the membrane with triethanolamine (TEOA) and optimized the operating conditions (transmembrane pressure, temperature, and crossflow velocity) to control the nanofiltration membrane fouling by brackish water. Based on the physiochemical characteristics and desalination performance of the prepared membranes, the membrane modified with 2% TEOA (MPCM2) was identified as the optimal membrane, and 0.5 MPa, 25 °C, and 7 cm/s were identified as the optimal operating conditions through a series of nanofiltration experiments. Moreover, the membrane cleaning procedure for fouled MPCM2 was further determined, and a two-step cleaning procedure using ethylene diamine tetraacetic acid disodium followed by HCl with a permeance recovery rate of 98.77% was identified as the optimal cleaning procedure. Furthermore, the characterizations of the fouled and cleaned MPCM2 showed that the optimized cleaning procedure could recover the properties of MPCM2 to near virgin. This study is of great significance for the long-term stable operation of nanofiltration processes in brackish water treatment to ensure the supply of healthy water in the water-deficient areas of northwest China.

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“…And, among the myriad of technologies available, membrane-based separation demonstrates strong competitive advantages that include energy-efficiency, cost-effectiveness, and small footprint. , The key to membrane-based separation is an organic solvent nanofiltration (OSN) process that is conventionally driven by the polymeric membranes. However, to this date, transport through such membranes is typically governed by a solution-diffusion mechanism, which tends to suffer from permeance-selectivity “trade-off”, owing to the dense cross-linked matrix that is central to keeping polymeric membranes chemically stable toward organic solvents.…”

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confidence: 99%

Hyperlooping Carbon Nanotube-Graphene Oxide Nanoarchitectonics as Membranes for Ultrafast Organic Solvent Nanofiltration

Nie

Goh

Wang

et al. 2023

ACS Materials Lett.

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Membrane technology is a key enabler for a circular pharmaceutical industry, but chemically resistant polymeric membranes for organic solvent nanofiltration (OSN) often suffer from lower-than-required performances. Recently, graphene-based laminated membranes using small-flake graphene oxide (SFGO) nanosheets open up new avenues for high-performance OSN, but their permeance toward high viscosity solvents is below expectation. To address this issue, we design hyperlooping channels using multiwalled carbon nanotubes (MWCNTs) intercalated within lanthanum(III) (La3+)-cross-linked SFGO nanochannels to form a ternary nanoarchitecture for low-resistant transport toward high viscosity solvents. At optimized MWCNT loading, the defect-free membrane exhibits 138 L m–2 h–1 bar–1 ethanol permeance at >99% rejections toward organic dyes, outperforming state-of-the-art graphene oxide (GO)-based membranes to date. Even butanolwith twice the viscosity of ethanolexhibits a permeance no less than 60 L m–2 h–1 bar–1 at comparable rejection rates. Theoretical simulation suggests that La3+ cross-linking is critical and can create an intact architecture that brings size exclusion into play as the dominant separation mechanism. Also, MWCNT nanochannel offers at least 1.5-fold lower ethanol transport resistance than that of the GO nanochannel, owing to greater bulk freedom in orientating ethanol molecules. Overall, the hyperlooping architecture demonstrates ∼3-fold higher permeance than neat SFGO membrane for elevating OSN performances.

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Deprotonated tannic acid regulating pyrrole polymerization to enhance nanofiltration performance for molecular separations under both aqueous and organic solvent environments

Cited by 11 publications

References 35 publications

Metal–Polyphenol Coordination at the Aqueous Contra-diffusion “Interface”: A Green Way to High-Performance Iron(III)/Tannic Acid Thin-Film-Composite Nanofiltration Membranes

Metal–Polyphenol Coordination at the Aqueous Contra-diffusion “Interface”: A Green Way to High-Performance Iron(III)/Tannic Acid Thin-Film-Composite Nanofiltration Membranes

Evaluation of Membrane Fouling Control for Brackish Water Treatment Using a Modified Polyamide Composite Nanofiltration Membrane

Hyperlooping Carbon Nanotube-Graphene Oxide Nanoarchitectonics as Membranes for Ultrafast Organic Solvent Nanofiltration

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