Preparation, characterization and acid/alkali stabilities of aromatic polyesteramide-based composite membranes for water desalination

Chen, Pengfei; Qu, Yufu; Meng, Lida; Lei, Jiao; Lu, Jiancong; Lü, Jianguo

doi:10.1016/j.seppur.2021.118739

Cited by 12 publications

(9 citation statements)

References 30 publications

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“…Membrane distillation (MD) is a thermally induced separation process driven by the vapor pressure difference between the two sides of a porous membrane. Compared with other membrane separation technologies, − MD has many advantages, such as the high theoretical rejection of nonvolatile substances (e.g., ions, macromolecules, colloids, cells, etc. ), and shows a promising prospect for the treatment of high-concentration salt aqueous solutions. − However, the process stability of membrane distillation is still a challenge in the industry due to membrane wetting. − It is critical to understand the membrane wetting mechanism and find out a wetting tolerance method for large-scale application.…”

Section: Introductionmentioning

confidence: 99%

Micromechanism Underlying Wetting Behavior of the Vacuum Membrane Distillation during Desalination

Lei

Meng

Yan

et al. 2022

Ind. Eng. Chem. Res.

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Membrane wetting is a crucial issue in the desalination process by vacuum membrane distillation (VMD). However, the micromechanism of the wetting behavior is far from clear. Here, electrospun nanofiber membranes (ENMs) had been utilized to clarify the pore variations inside the membrane for desalination from NaCl aqueous solution, where the distinct open pore structure of ENMs could address the characterizing limitations for the change occurring in the membrane pores. A wetting formation model had been depicted on the basis of characterized results, illustrating that the basic reason for wetting was the initial NaCl crystallization caused by supersaturation, which was different from the membrane pores blocking or the structure damage caused by scaling. Moreover, membrane regeneration experiments also showed that the wetting caused by the crystallization of NaCl was reversible. By a reasonable regeneration strategy, VMD used for desalination was expected to achieve continuous operation with rejection over 99.9%.

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Section: Introductionmentioning

confidence: 99%

Micromechanism Underlying Wetting Behavior of the Vacuum Membrane Distillation during Desalination

Lei

Meng

Yan

et al. 2022

Ind. Eng. Chem. Res.

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“…In addition, a new peak at 1742 cm –1 could be easily observed from FANF2, which was caused by the stretching of CO in the ester group. The peak could be caused by the reaction between the lively OC–Cl group of TMC and the −OH group of FA . The PMIA substrate, FANF0, and FANF2 showed the same peaks at 3300 cm –1 because of N–H stretching.…”

Section: Results and Discussionmentioning

confidence: 95%

Thin-Film Composite Nanofiltration Membrane Modified by Fulvic Acid to Enhance Permeability and Antifouling Performance

et al. 2022

Ind. Eng. Chem. Res.

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A novel thin-film composite (TFC) nanofiltration (NF) membrane was manufactured by interfacial polymerization (IP) with addition of the additive fulvic acid (FA) into the piperazine (PIP) aqueous solution onto a poly(m-phenylene isophthalamide) (PMIA) substrate. The aqueous phase additive FA can effectively modify the PA layer structure by slowing down the diffusion of the PIP monomer and reacting with trimesoyl chloride (TMC) to generate ester groups. The pure water permeability (PWP) of the optimized NF membrane enhanced from 10.4 to 22.3 L m −2 h −1 bar −1 , and the Na 2 SO 4 rejection remained above 97.8%. The outstanding performance benefited from superior hydrophilicity, enlarged pores, and a relatively thin separation layer. Furthermore, the obtained NF membrane presented ascendant thermal stability, long-term stability, and fouling resistance. Therefore, this work offers novel insight into regulation of the PA layer structure and promotion of NF membrane performance.

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“…In addition, nanomaterial incorporation often impairs the separation performance of pristine membranes owing to poor PA−nanomaterial compatibility. [10] Hence, polymers with different chemistries, such as polysulfonamide, [7] polyesteramide, [11] polyamine, [12] polyurea, [13] and poly(vinyl alcohol) (PVA), [14] have been explored as selective layer materials for fabricating pH-resistant membranes. The available studies suggest that these new chemistries exhibit excellent acid resistance, but they are unstable under extremely alkaline conditions (pH >14).…”

Section: Introductionmentioning

confidence: 99%

Extreme pH‐Resistant, Highly Cation‐Selective Poly(Quaternary Ammonium) Membranes Fabricated via Menshutkin Reaction‐Based Interfacial Polymerization

Jeon

Kim

Choi

et al. 2023

Adv Funct Materials

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Membrane-based separation technologies have attracted significant interest from various industries owing to their high process efficiency. However, the wider applications of conventional polyamide (PA) thin-film composite (TFC) membranes are limited by their poor pH stability and low cation selectivity, necessitating the development of membranes with advanced chemistries. Herein, an extreme pH-resistant, highly cation-selective TFC membrane is fabricated by synthesizing a crosslinked poly(quaternary ammonium) (PQA) selective layer on a polyethylene support via Menshutkin reaction-based interfacial polymerization (Men-IP). The Men-IP process produces a thin, densely crosslinked, and positively charged PQA permselective layer without hydrolysisprone functional groups. The fabricated PQA membrane features a highly selective molecular density that significantly exceeds those of previously reported membranes with non-PA chemistries. Moreover, the PQA membrane exhibits remarkably high rejection (>90%) and selectivity for divalent cations owing to the exceptionally strong positive charge imparted by its abundant cationic QA groups. More importantly, the PQA membrane displays ultrahigh pH stability under both extremely acidic (1.5 m H 2 SO 4 ) and alkaline (5 m NaOH) conditions for 28 days. No other membrane reported in the literature demonstrates such excellent pH stability. This strategy opens a new route for fabricating highly selective membranes that can be used in harsh pH environments.

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Preparation, characterization and acid/alkali stabilities of aromatic polyesteramide-based composite membranes for water desalination

Cited by 12 publications

References 30 publications

Micromechanism Underlying Wetting Behavior of the Vacuum Membrane Distillation during Desalination

Micromechanism Underlying Wetting Behavior of the Vacuum Membrane Distillation during Desalination

Thin-Film Composite Nanofiltration Membrane Modified by Fulvic Acid to Enhance Permeability and Antifouling Performance

Extreme pH‐Resistant, Highly Cation‐Selective Poly(Quaternary Ammonium) Membranes Fabricated via Menshutkin Reaction‐Based Interfacial Polymerization

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