Thin-film composite nanofiltration membrane based on polyurea for extreme pH condition

Zhang, Yang; Wan, Ying; Liu, Yu; Pan, Guoyuan; Yu, Hao; Du, Wenjie; Shi, Hongwei; Wu, Changjiang; Liu, Yiqun

doi:10.1016/j.memsci.2021.119472

Cited by 29 publications

(13 citation statements)

References 44 publications

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“…As shown in this process, reusing was beneficial in terms of permeate flux and Sc selectivity over several impurities, such as Fe, V, or U (Figure ). The behavior is in agreement with previous studies showing that acid soaking may result in higher permeability of polyethyleneimine-coated thin film composite membranes. , Although not disclosed, AMS patents suggest a comparable active layer in the NanoPro A-3014 membrane. , In addition, despite the higher permeate flux in batches three to five, no higher element retention was observed (Figure ), indicating that the ion flux increased proportionally to the water flux (convective flow). Lopez et al observed a similar behavior when testing NF for rare earth element recovery from acidic solutions and interpreted it as a sign of increased pore size caused by degradation .…”

Section: Resultssupporting

confidence: 91%

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste

Hedwig

Yagmurlu

Peters³

et al. 2023

ACS Sustainable Chem. Eng.

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Scandium (Sc), declared a critical raw material in the European Union (EU), could face further supply issues as the EU depends almost entirely on imports from China, Russia, and Ukraine. In this study, a tandem nanofiltration-solvent extraction procedure for Sc recovery from titania (TiO2) acid waste was piloted and then augmented by antisolvent crystallization. The new process, comprising advanced filtration (hydroxide precipitation, micro-, ultra-, and nanofiltration), solvent extraction, and antisolvent crystallization, was assessed in relation to material and energy inputs and benchmarked on ScF3 production. From ∼1 m3 of European acid waste containing traces of Sc (81 mg L–1), ∼13 g of Sc (43% yield, nine stages) was recovered as (NH4)3ScF6 with a purity of approximately 95%, demonstrating the technical feasibility of the approach. The production costs per kilogram of ScF3 were lower than reported market prices, which underscores a competitive process at scale. Although a few technical bottlenecks (e.g., S/L separation and electricity consumption) need to be overcome, combining advanced filtration with solvent extraction and antisolvent crystallization promises a future supply of this critical raw material from European secondary sources.

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Section: Resultssupporting

confidence: 91%

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste

Hedwig

Yagmurlu

Peters³

et al. 2023

ACS Sustainable Chem. Eng.

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“…The usage of new monomers in the IP reaction to fabricate novel NF membranes was proven to be a useful method. Polyurea membranes prepared using different diisocyanates as organic phase monomers were confirmed to be stable in extreme pH conditions because the urea (−NH–CO–NH−) bond was stronger than the amide (−NH–CO−) bond . Multifunctional amines such as poly(ether imide) (PEI), melamine (Mel), and ethylene diamine as water phase monomers reacted with cyanuric chloride or 1,3,5-tris(bromomethyl)-benzene to fabricate polyamine membranes that presented better pH resistance than their polyamide equivalents. ,− Polysulfonamide membranes also showed an excellent stability in extreme acidic conditions, − and the mechanism was further researched. , Sometimes the combination of different amines such as Mel/PIP and Mel/PEI could lead to an improved stability for acidic nanofiltration under conditions of pH < 2.…”

Section: Introductionmentioning

confidence: 99%

How Does Alkali Etching Work on the Polyamide Membrane to Obtain an m-Phenylenediamine-Based NF Membrane?

Liu²,

Tang

et al. 2022

Ind. Eng. Chem. Res.

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Fully aromatic polyamide (PA) membranes have been studied as nanofiltration (NF) membranes for decades because of their good chemical stability, but most of the membranes suffered from poor permeability and high rejection for monovalent ions. In this paper, an m-phenylenediamine (MPD)-based NF membrane was prepared by alkali activation on a reverse osmosis (RO) membrane. Characterization revealed the different etching paths on RO membranes fabricated by different concentrations of monomers of interfacial polymerization. The looser PA layer of RO membrane fabricated by lower-concentration monomers was easily invaded by NaOH molecules because of the higher molecular weight cutoff of 254 Da, which resulted in the transformation of separation grade from RO to NF. At the same time, the MPD-based NF membrane exhibited superior water permeability and pH resistance compared with a PIP-based membrane, which showed a potential to realize large-scale application in practical industry settings. It also provided a facile method for the preparation of a high-performance NF membrane with good chemical stability.

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“…As ATR-FTIR spectra are presented in Figure 2b, for TDI hydrolysate, the characteristic peaks at ∼3304, 1676, and 1524 cm −1 are assigned to the N−H stretching vibration, CO stretching of urea groups, respectively, while the peak at ∼2267 cm −1 comes from the residue NCO groups. 21,22 Compared with neat BPPO, a broader band around 3334 cm −1 appears in the TDI-BPPO membrane. It could be attributed to overlapping of N−H bonds in urea and aromatic secondary amine, which comes from the nucleophilic reaction between amine end groups of TDI hydrolysate and benzyl bromides of BPPO.…”

Section: Characterizationmentioning

confidence: 99%

Synchronous Engineering for Biomimetic Murray Porous Membranes Using Isocyanate

Liu

2022

Nano Lett.

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Highly permselective and durable membranes are desirable for massive separation applications. However, currently most membranes prepared using nonsolvent-induced phase separation (NIPS) suffer from low permeability and a high fouling tendency due to the great challenges in a rational design and also practical approach for membrane optimization. Inspired by the natural Murray network from vascular plants, we developed a hierarchical membrane via a straightforward yet robust strategy, using isocyanate as a multifunctional additive. Thanks to the integrated functions of a phase separation regulator, blowing agent, cross-linker, and functionalization anchor of isocyanate, our strategy is featured as a perfect combination of a phase separation and chemical reaction, and it enables synchronous engineering of the membrane hierarchy on porosity and components. The representative membrane exhibits superior water permeance (334 L/m2·h·bar), protein retention (>98%), and antifouling ability (flux recover ratio ∼ 98%). This work highlights a versatile path for pursuing a highly enhanced performance of NIPS-made membranes, from the fancy perspective of Murray bionics.

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Thin-film composite nanofiltration membrane based on polyurea for extreme pH condition

Cited by 29 publications

References 44 publications

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste

How Does Alkali Etching Work on the Polyamide Membrane to Obtain an m-Phenylenediamine-Based NF Membrane?

Synchronous Engineering for Biomimetic Murray Porous Membranes Using Isocyanate

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Thin-film composite nanofiltration membrane based on polyurea for extreme pH condition

Cited by 29 publications

References 44 publications

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO2 Acid Waste

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO2 Acid Waste

How Does Alkali Etching Work on the Polyamide Membrane to Obtain an m-Phenylenediamine-Based NF Membrane?

Synchronous Engineering for Biomimetic Murray Porous Membranes Using Isocyanate

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Product

Resources

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From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste

From Trace to Pure: Pilot-Scale Scandium Recovery from TiO₂ Acid Waste