Extra-thin composite nanofiltration membranes tuned by γ-cyclodextrins containing amphipathic cavities for efficient separation of magnesium/lithium ions

Zhao, Ying; Li, Nan; Shi, Jie; Xia, Yuanhua; Zhu, Bo; Shao, Ruiqi; Min, Chunying; Xu, Zhiwei; Deng, Hui

doi:10.1016/j.seppur.2021.120419

Cited by 53 publications

(11 citation statements)

References 62 publications

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“…We used molecular dynamics simulation to evaluate the diffusion coefficient of PIP and PEI monomer, which was a convenient way to better understand the effect of PIP on the diffusion of PEI during the IP process, and thus further explored the surface charge and hydrophilicity of the active layer. The modeling process has been described in our previous study …”

Section: Methodsmentioning

confidence: 99%

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One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

Guo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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To coordinate the trade-off between the separation and permeation of the nanofiltration membrane for the separation of Mg2+/Li+, we regulated poly(ethyleneimine)/piperazine interface polymerization parameters to construct a positively/negatively charged ultrathin Janus nanofiltration membrane at a free aqueous–organic interface. At the optimized interfacial polymerization parameters, 0.03 wt % of piperazine reacted with trimethylbenzene chloride prior to poly(ethyleneimine), forming a primary polyamide layer with fewer defects or limiting large-scale defects of the polyamide layer. The controlled subsequent reaction of poly(ethyleneimine) and trimethylbenzene chloride results in a Janus nanofiltration membrane, with one side enriched with the carboxyl groups, the other side enriched with the amine groups, and a dense polyamide structure in the middle. Under the optimum conditions, the positive potential of the rear surface of the prepared membrane was 14.57 mV, and the water contact angle reached 71.31°, while the negative potential of the front surface was −25.48 mV, and the water contact angle was 12.93°, confirming a Janus membrane with opposite charges and large hydrophilicity differences in the front and rear surfaces. With a high cross-linking degree, a 40 nm thick polyamide layer is 29.09% more thinner than the traditional polyamide membrane. The ultrathin Janus nanofiltration membrane showed an excellent separation factor (S Li,Mg of 18.26), stability, and water permeability flux (10.6 L·m–2·h–1·bar–1). The rejections to MgCl2, CaCl2, MgSO4, and Na2SO4 are measured above 90% at a nearly constant permeability of 10.6 L·m–2·h–1·bar–1, particularly stable rejections to MgCl2 and Na2SO4.

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Section: Methodsmentioning

confidence: 99%

“…The modeling process has been described in our previous study. 30 The concentrations of PEG in the feed and permeate were tested by the total organic carbon analyzer (TOC, multi N/C 3100, Analytik Jena). The molecular weight of PEG for the rejection of 90% was defined as MWCO.…”

Section: Characterization X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

Guo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Pore sizes in nanofiltration membranes should be between 1 and 10 nm, and on comparing the pore diameters of membrane used in different technologies, it can be noted that nanofiltration membranes have smaller pore diameters than MF and UF membranes but larger pore diameters than RO membranes. Due to environmental and energy concerns, highly permeable nanofiltration membranes are in high demand for water purification (desalination) and soluble particle separation [ 27 , 80 , 81 ]. Researchers across different fields are working on fabrication and modification of nanofiltration membranes by using different approaches [ 82 , 83 , 84 ].…”

Section: Application Of Cellulose Nanocrystals In Desalination Applic...mentioning

confidence: 99%

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

2022

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Membrane-based desalination has proved to be the best solution for solving the water shortage issues globally. Membranes are extremely beneficial in the effective recovery of clean water from contaminated water sources, however, the durability as well as the separation efficiency of the membranes are restricted by the type of membrane materials/additives used in the preparation processes. Nanocellulose is one of the most promising green materials for nanocomposite preparation due to its biodegradability, renewability, abundance, easy modification, and exceptional mechanical properties. This nanocellulose has been used in membrane development for desalination application in the recent past. The study discusses the application of membranes based on different nanocellulose forms such as cellulose nanocrystals, cellulose nanofibrils, and bacterial nanocellulose for water desalination applications such as nanofiltration, reverse osmosis, pervaporation, forward osmosis, and membrane distillation. From the analysis of studies, it was confirmed that the nanocellulose-based membranes are effective in the desalination application. The chemical modification of nanocellulose can definitely improve the surface affinity as well as the reactivity of membranes for the efficient separation of specific contaminants/ions.

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“…[165,166] Positively charged NF membranes were also investigated and showed a superior attitude in the separation of Li + /Mg 2+ ions in highly concentrated streams due to the Donnan exclusion phenomenon. [167][168][169][170][171][172][173][174]…”

Section: Nanofiltration Membranesmentioning

confidence: 99%

Recent Advances in the Lithium Recovery from Water Resources: From Passive to Electrochemical Methods

et al. 2022

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The ever-increasing amount of batteries used in today's society has led to an increase in the demand of lithium in the last few decades. While mining resources of this element have been steadily exploited and are rapidly depleting, water resources constitute an interesting reservoir just out of reach of current technologies. Several techniques are being explored and novel materials engineered. While evaporation is very time-consuming and has large footprints, ion sieves and supramolecular systems can be suitably tailored and even integrated into membrane and electrochemical techniques. This review gives a comprehensive overview of the available solutions to recover lithium from water resources both by passive and electrically enhanced techniques. Accordingly, this work aims to provide in a single document a rational comparison of outstanding strategies to remove lithium from aqueous sources. To this end, practical figures of merit of both main groups of techniques are provided. An absence of a common experimental protocol and the resulting variability of data and experimental methods are identified. The need for a shared methodology and a common agreement to report performance metrics are underlined.

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Extra-thin composite nanofiltration membranes tuned by γ-cyclodextrins containing amphipathic cavities for efficient separation of magnesium/lithium ions

Cited by 53 publications

References 62 publications

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

Recent Advances in the Lithium Recovery from Water Resources: From Passive to Electrochemical Methods

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Extra-thin composite nanofiltration membranes tuned by γ-cyclodextrins containing amphipathic cavities for efficient separation of magnesium/lithium ions

Cited by 53 publications

References 62 publications

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li+ and Mg2+

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li+ and Mg2+

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

Recent Advances in the Lithium Recovery from Water Resources: From Passive to Electrochemical Methods

Contact Info

Product

Resources

About

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺