Constructing positively charged acid-resistant nanofiltration membranes via surface postgrafting for efficient removal of metal ions from electroplating rinse wastewater

Bai, Yong; Gao, Peng; Fang, Rong; Cai, Jing; Zhang, Lidan; He, Qin‐Yuan; Zhou, Zihao; Sun, Shi‐Peng; Cao, Xun

doi:10.1016/j.seppur.2022.121500

Cited by 37 publications

(7 citation statements)

References 53 publications

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“…The more obvious PWP decline for the IP‐IL than the IP‐PEI/IL (attenuation coefficient 2.58 vs. 1.13) implies that the PEI molecules can fill into the swollen PA network during the solvent treatment and thus inhibit its shrinkage during water filtration. Therefore, the deep grafting of PEI into the swollen PA layer also results in a thicker PA layer of the IP‐PEI/IL (from 15.1 nm of IP‐IL to 46.5 nm), which is similar to the results reported in literature 35 (Figure 2D). Notably, the thicker separation layer is expected to enhance the robustness of the NF membrane in wastewater treatment with frequent chemical cleaning.…”

Section: Resultssupporting

confidence: 89%

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Liu

Wan

et al. 2023

AIChE Journal

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Surface grafting has been widely used to tune hydrophilicity and chargeability of nanofiltration membranes for reducing membrane fouling potential. However, surface grafting typically leads to a significant pore narrowing and resultant permeability loss, and monocharged surface still struggles to resist mixed foulants with different charges. Herein, ionic liquid (IL)‐ethanol (EtOH) solution containing polyethyleneimine (PEI) is used to rearrange the nascent polyamide layer. The high affinity of IL to the PA layer and the low diffusion steric hindrance of EtOH contribute to the polyamide swelling and PEI deep grafting, during which the “self‐regulation” effect (larger pores would be filled with more PEI molecules) narrows the pore size distribution and enhances hydrophilicity. The nearly charge‐neutral and smooth separation layer shows impressive antifouling capacity to hydrophobic macromolecules and mixed charged molecules, along with long‐term operating stability for real wastewater treatment. This study emphasizes the importance of solvent properties on the membrane grafting behavior.

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Section: Resultssupporting

confidence: 89%

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Liu

Wan

et al. 2023

AIChE Journal

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“…In contrast, the rejection of MB increased to 44 ± 2% at pH 5.0. Thus, 2 films can change the diffusivity of negatively charged dyes in response to the protonation degree of imidazole units [ 41 , 42 , 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Nanofiltration Performance of Poly(p-xylylene) Nanofilms with Imidazole Side Chains

et al. 2023

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Herein, we report the nanofiltration performance of poly(p-xylylene) thin films with imidazole side chains that were deposited onto commercial polyethersulfone ultrafiltration membranes using a chemical vapor deposition process. The resulting thin films with a few tens of nanometers exhibited water permeation under a pressure difference of 0.5 MPa and selectively rejected water-soluble organic dyes based on their molecular sizes. Additionally, thin flaky ZIF-L crystals (Zn(mim)2·(Hmim)1/2·(H2O)3/2) (Hmim = 2-methylimidazole) formed on the surface of imidazole-containing poly(p-xylylene) films, and the composite films demonstrated the ability to adsorb methylene blue molecules within the cavities of ZIF-L.

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“…[14][15][16] These membranes were usually prepared by interfacial polymerization of trimesoyl chloride (TMC) with polyethyleneimine (PEI) that DOI: 10.1002/adfm.202305815 provides many amine groups ensuring positive charge of resultant membranes. [17][18][19][20] Yet pristine PEI-TMC TFCMs show limited permeance due to their relatively high crosslinking degree and dense structures.…”

Section: Introductionmentioning

confidence: 99%

Designing Gemini‐Electrolytes for Scalable Mg²⁺/Li⁺ Separation Membranes and Modules

Peng,

Su,

Liu

et al. 2023

Adv Funct Materials

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High performance polyamide nanofiltration membranes play important roles in Mg2+/Li+ separation and Li+ extraction, but they are prepared via multiple time‐/labor demanding steps. Both the scalability of these membranes and the engineering of membrane modules remain an elusive challenge. Here the design of a Gemini‐electrolyte monomer (GEM) featuring bidentate amine groups, quaternary ammonia, and endocyclic contorted conformation is reported. The monomer's low interfacial diffusivity is balanced by high condensational reactivity during its interfacial polymerization with trimesoyl chloride (TMC), leading to the straightforward formation of defect‐free, ≈14 nm thick membranes. The membrane shows the highest permeance (≈19.2 L m−2 h−1 bar−1) among Mg2+/Li+ nanofiltration membranes prepared via straightforward interfacial polymerization without post‐modification, combined with good Mg2+/Li+ selectivity (≈15.4) and stability. The validity of GEM design is verified by control monomers. Large‐area (1 × 2 m2) GEM‐TMC membranes and spiral‐wound modules (effective area: 0.5 m2) are prepared, both of which show reproducible and high performance.

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Constructing positively charged acid-resistant nanofiltration membranes via surface postgrafting for efficient removal of metal ions from electroplating rinse wastewater

Cited by 37 publications

References 53 publications

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Nanofiltration Performance of Poly(p-xylylene) Nanofilms with Imidazole Side Chains

Designing Gemini‐Electrolytes for Scalable Mg²⁺/Li⁺ Separation Membranes and Modules

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Constructing positively charged acid-resistant nanofiltration membranes via surface postgrafting for efficient removal of metal ions from electroplating rinse wastewater

Cited by 37 publications

References 53 publications

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Ionic liquid‐induced deep grafting of polyelectrolyte to reform polyamide layer for antifouling nanofiltration membrane

Nanofiltration Performance of Poly(p-xylylene) Nanofilms with Imidazole Side Chains

Designing Gemini‐Electrolytes for Scalable Mg2+/Li+ Separation Membranes and Modules

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Designing Gemini‐Electrolytes for Scalable Mg²⁺/Li⁺ Separation Membranes and Modules