Fabrication of ultrafiltration membrane surface with synergistic anti-fouling effect of “dispersion-impedance” and anti-fouling mechanism of dye

Wei, Qianqian; Tian, Zihan; Wang, Hong; Qin, Shuhao; Qin, Qingqing; Zhang, Jing; Cui, Zhenyu

doi:10.1016/j.memsci.2022.121028

Cited by 13 publications

(4 citation statements)

References 48 publications

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“…ζ-Potential analysis reveals that both TPEI-1 and TPEI-2 exhibit electropositive properties in their aqueous solutions, whereas this feature decreases from PEI to TPEI-1 and TPEI-2 (Figure e). There are still certain numbers of amino and imino groups in TPEIs, which are inclined to bind protons to form quaternary ammonium ions, endowing TPEIs with electropositive properties. , With more thiophene consuming the amino groups of PEI, TPEI-2 is inferior to TPEI-1 in electropositive characteristics, further indicative of the successful synthesis of TPEIs.…”

Section: Resultsmentioning

confidence: 99%

“…There are still certain numbers of amino and imino groups in TPEIs, which are inclined to bind protons to form quaternary ammonium ions, endowing TPEIs with electropositive properties. 46,47 With more thiophene consuming the amino groups of PEI, TPEI-2 is inferior to TPEI-1 in electropositive characteristics, further indicative of the successful synthesis of TPEIs.…”

Section: Chlorine Resistancementioning

confidence: 99%

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Construction and Chlorine Resistance of Thiophene-Poly(ethyleneimine)-Based Dual-Functional Nanofiltration Membranes

Cheng

Meng

2023

ACS Appl. Mater. Interfaces

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The demand to improve the chlorine resistance of polyamide (PA) membranes is escalated with greater amounts of chlorine-containing disinfectant being used in global water treatment during the COVID-19 pandemic. In this work, we designed thiophene-functionalized poly(ethyleneimine) (TPEI) materials first and grafted them onto a conventional PA membrane to develop novel nanofiltration membranes (PEI-M, TPEI-1-M, TPEI-2-M). These membranes have dual-functionalized selective surfaces covered by hydrophilic amino groups and electron-rich thiophene moieties, which endow these membranes with superior chlorine resistance and improved separation performance. The modified membranes increase the rejection of MgCl2 from 86.5% of the nascent PA membrane (PA-M) to higher than 93.0% without sacrificing the membrane water permeability. More stable separation performance is achieved with all of the as-prepared membranes than PA-M after exposure to a 2000 ppm sodium hypochlorite solution. TPEI-2-M outperforms other membranes after being treated in a chlorination intensity of 16,000 ppm·h with the smallest flux loss and the highest MgCl2 rejection. This is mainly ascribed to the highest amount of amino and thiophene moieties on the TPEI-2-M surface. This study provides an effective protocol for developing novel PA-based nanofiltration membranes while demonstrating its superiority over current technologies with exceptional separation performance and antichlorine ability.

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Section: Resultsmentioning

confidence: 99%

Section: Chlorine Resistancementioning

confidence: 99%

Construction and Chlorine Resistance of Thiophene-Poly(ethyleneimine)-Based Dual-Functional Nanofiltration Membranes

Cheng

Meng

2023

ACS Appl. Mater. Interfaces

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“…Natural organic matter (NOM) such as humic acid (HA) and sodium alginate (SA) consist of hydrophobic aliphatic and aromatic moieties, allowing these types of foulants to be adsorbed on the membrane surface through hydrophobic interactions. Organic dyes (e.g., Congo red, methyl blue, rhodamine B, malachite green, methyl orange, rose Bengal dye, acid black 210, and so on [ 28 , 29 , 30 , 31 ]) are interesting foulants due to their complex structure, and electrical charge. In addition, dye effluents have high salinity due to the addition of salts (common practice by textile industries to enhance dye uptake) [ 28 , 32 ], which makes the fouling mechanism by organic dyes complex.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the charged nature of the dye molecules, it can induce concentration polarization, affecting the flux. Additionally, the adsorbed dye can form strong chemical bonds with the groups on the membranes surface (or within the membrane pores) [ 29 ]. Oil foulants can exist as free oil, emulsified oil and/or dissolved oil which could form fouling on the membrane surface through hydrophobic–hydrophobic interactions.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances on the Fabrication of Antifouling Phase-Inversion Membranes by Physical Blending Modification Method

et al. 2023

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Membrane technology is an essential tool for water treatment and biomedical applications. Despite their extensive use in these fields, polymeric-based membranes still face several challenges, including instability, low mechanical strength, and propensity to fouling. The latter point has attracted the attention of numerous teams worldwide developing antifouling materials for membranes and interfaces. A convenient method to prepare antifouling membranes is via physical blending (or simply blending), which is a one-step method that consists of mixing the main matrix polymer and the antifouling material prior to casting and film formation by a phase inversion process. This review focuses on the recent development (past 10 years) of antifouling membranes via this method and uses different phase-inversion processes including liquid-induced phase separation, vapor induced phase separation, and thermally induced phase separation. Antifouling materials used in these recent studies including polymers, metals, ceramics, and carbon-based and porous nanomaterials are also surveyed. Furthermore, the assessment of antifouling properties and performances are extensively summarized. Finally, we conclude this review with a list of technical and scientific challenges that still need to be overcome to improve the functional properties and widen the range of applications of antifouling membranes prepared by blending modification.

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Superhydrophilic multifunctional antifogging coatings based on triethoxysilyl-terminated poly(N-vinylpyrrolidone)

Meng

Wang

et al. 2023

J Coat Technol Res

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Fabrication of ultrafiltration membrane surface with synergistic anti-fouling effect of “dispersion-impedance” and anti-fouling mechanism of dye

Cited by 13 publications

References 48 publications

Construction and Chlorine Resistance of Thiophene-Poly(ethyleneimine)-Based Dual-Functional Nanofiltration Membranes

Construction and Chlorine Resistance of Thiophene-Poly(ethyleneimine)-Based Dual-Functional Nanofiltration Membranes

Recent Advances on the Fabrication of Antifouling Phase-Inversion Membranes by Physical Blending Modification Method

Superhydrophilic multifunctional antifogging coatings based on triethoxysilyl-terminated poly(N-vinylpyrrolidone)

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