Humic Acid Modified Selective Nanofiltration Membrane for Efficient Separation of PFASs and Mineral Salts

Wang, Tianlin; Han, Hongyi; Wu, Zhichao; Dai, Ruobin; Wang, Zhiwei

doi:10.1021/acsestwater.2c00154

Cited by 6 publications

(7 citation statements)

References 56 publications

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“…9,10 NF has also been used to selectively remove micropollutants without removing benign mineral ions. 11,12 The ability to achieve selective solute-solute separation in these contexts can lead to a desired product water quality (e.g., reserving nutrient ions for fertigation), prevention of mineral scaling in subsequent desalination processes, and/or energy saving via reducing transmembrane osmotic pressure difference.…”

Section: Introductionmentioning

confidence: 99%

Performance metrics for nanofiltration-based selective separation for resource extraction and recovery

Wang

et al. 2023

Nat Water

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Membrane ltration has been widely adopted in various water treatment applications, but its use in selective solute separation for resource extraction and recovery is an emerging research area. When a membrane process is applied for solute-solute separation to extract solutes as the product, the performance metrics and process optimization strategies should differ from a membrane process for water production because of separation goals are fundamentally different. In this analysis, we used lithium (Li) magnesium (Mg) separation as a representative solute-solute separation to illustrate the de ciency of existing performance evaluation framework developed for water-solute separation using nano ltration (NF). We performed coupon and module scale analyses of mass transfer to elucidate how membrane properties and operating conditions affect the performance of Li/Mg separation in NF.Notably, we identi ed an important operational tradeoff between Li/Mg selectivity and Li recovery, which is critical for process optimization. We also established a new framework for evaluating membrane performance based on the success criteria of Li purity and recovery. This analysis lays the theoretical foundation for performance evaluation and process optimization for NF-based selective solute separation.

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Section: Introductionmentioning

confidence: 99%

Performance metrics for nanofiltration-based selective separation for resource extraction and recovery

Wang

et al. 2023

Nat Water

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“…For example, in the context of drinking water treatment, Ca 2+ is crucial for human health. Therefore, enough minerals (i.e., low rejection to Ca 2+ ) are crucial for high-quality drinking water production in addition to high PFOS rejection …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, enough minerals (i.e., low rejection to Ca 2+ ) are crucial for high-quality drinking water production in addition to high PFOS rejection. 34…”

Section: Membrane Separation Performancementioning

confidence: 99%

Precise Regulation of Monomer Reactive Sites Enhances the Water Permeance and Membrane Selectivity of Polyamide Nanofiltration Membranes

Jiang,

Long,

Peng

et al. 2023

Ind. Eng. Chem. Res.

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Polyamide structure and chemistry play critical roles in the separation performance of thin-film composite (TFC) nanofiltration (NF) membranes. Typically, polyamide formation is based on the reactive sites on monomers (e.g., amino groups on piperazine (PIP)) during interfacial polymerization (IP). To precisely tailor polyamide properties (e.g., cross-linking degree) and membrane performance, we regulated PIP reactive sites by pH adjustment to vary the dominant species in forms of non-, mono-, and diprotonated PIP. Specifically, at pH values between pK a1 (i.e., 5.3) and pK a2 (i.e., 9.7), the dominant monoprotonated PIP with relatively fewer nonprotonated PIP resulted in a reduced cross-linking degree of polyamide. Such reduced cross-linked polyamide exhibited simultaneously improved water permeance and better solute-to-solute selectivity (e.g., CaCl2/Na2SO4 and CaCl2/PFOS selectivity), thanks to their looser structure and more negative charge. For example, membrane NF-pH9, prepared at pH 9, exhibited simultaneously improved water permeance (20.2 L m–2 h–1 bar–1) and higher CaCl2/PFOS selectivity (12.6). The dominant diprotonated PIP with little nonprotonation at pH < pK a1 resulted in ineffective cross-linked polyamide with low salt rejection (e.g., 0.9 ± 0.3% of Na2SO4). This study investigated a facile strategy to tailor membrane permeance and selectivity by regulating monomer reactive sites, which provides new insights into the development of high-performance NF membranes.

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Section: Introductionmentioning

confidence: 99%

Performance Metrics for Nanofiltration-based Selective Separation for Resource Extraction and Recovery

Wang

et al. 2022

Preprint

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Membrane filtration has been widely adopted in various water treatment applications, but its use in selective solute separation for resource extraction and recovery is an emerging research area. When a membrane process is applied for solute-solute separation to extract solutes as the product, the performance metrics and process optimization strategies should differ from a membrane process for water production because of separation goals are fundamentally different. In this analysis, we used lithium (Li) magnesium (Mg) separation as a representative solute-solute separation to illustrate the deficiency of existing performance evaluation framework developed for water-solute separation using nanofiltration (NF). We performed coupon and module scale analyses of mass transfer to elucidate how membrane properties and operating conditions affect the performance of Li/Mg separation in NF. Notably, we identified an important operational tradeoff between Li/Mg selectivity and Li recovery, which is critical for process optimization. We also established a new framework for evaluating membrane performance based on the success criteria of Li purity and recovery. This analysis lays the theoretical foundation for performance evaluation and process optimization for NF-based selective solute separation.

show abstract

Humic Acid Modified Selective Nanofiltration Membrane for Efficient Separation of PFASs and Mineral Salts

Cited by 6 publications

References 56 publications

Performance metrics for nanofiltration-based selective separation for resource extraction and recovery

Performance metrics for nanofiltration-based selective separation for resource extraction and recovery

Precise Regulation of Monomer Reactive Sites Enhances the Water Permeance and Membrane Selectivity of Polyamide Nanofiltration Membranes

Performance Metrics for Nanofiltration-based Selective Separation for Resource Extraction and Recovery

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