Combustion Fabrication of Nanoporous Graphene for Ionic Separation Membranes

Li, Zhan; Zhang, Xin; Tan, Hongxin; Qi, Wei; Wang, Li; Ali, Mohammad Chand; Zhang, Haijuan; Chen, Jia; Hu, Peizhuo; Chen, Fan; Qiu, Hongdeng

doi:10.1002/adfm.201805026

Cited by 69 publications

(44 citation statements)

References 37 publications

(53 reference statements)

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“…According to the previous report, the characteristic peak of the new phase can be indexed to the (003) plane of hydrotalcite ( Garcia-Gallastegui et al., 2012 ), which we define as Zn-hydrotalcite covering GO. In the previous work, theoretical calculation showed that a cyclic structure can be formed between nitrate ions and water molecules by hydrogen bonding ( Li et al., 2018 ). This distribution pattern leads to the formation of a layered structure of ions and water molecules parallel to the graphene surface.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of the amount of Zn(NO 3 ) 2 from 300 g/L to 500 g/L, the peak position remains unchanged but its intensity shows a trend from rising to decline, reaching the highest point at 400 g/L. The effect may be attributed to an increase in the integral lateral area of hydrotalcite, and then a mass of emerging pores on the Zn-hydrotalcite surface reduces its crystallinity ( Garcia-Gallastegui et al., 2012 ; Li et al., 2018 ). These results also can be confirmed by transmission electron microscope (TEM) images as shown in Figures 1 D and S2 .…”

Section: Resultsmentioning

confidence: 99%

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Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth

et al. 2021

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Summary Rare earth separation is still a major challenge in membrane science. Nitrogen-doped nanoporous graphene (NDNG) is a promising material for membrane separation, but it has not yet been tested for rare earth separation, and it is limited by multi-complex synthesis. Herein, we developed a one-step, facile, and scalable approach to synthesize NDNG with tunable pore size and controlled nitrogen content using confinement combustion. Nanoporous hydrotalcite from Zn(NO 3 ) 2 is formed between layers of graphene oxide (GO) absorbed with phenylalanine via confinement growth, thus preparing the sandwich hydrotalcite/phenylalanine/GO composites. Subsequently, area-confinement combustion of hydrotalcite nanopores is used to etch graphene nanopores, and the hydrotalcite interlayer as a closed flat nanoreactor induces two-dimensional space confinement doping of planar nitrogen into graphene. The membrane prepared by NDNG achieves separation of Sc 3+ from the other rare earth ions with excellent selectivity (∼3.7) through selective electrostatic interactions of pyrrolic-N, and separation selectivity of ∼1.7 for Tm 3+ /Sm 3+ .

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth

et al. 2021

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“…The nanopores of graphene membranes provide a significant pathway for ion penetration, therefore the ion selectivity facilitates the metal ion separation, Furthermore, the ion diffusion of porous graphene membranes can be enhanced by acid addition. To develop a metal ion separation performance, the pores of a graphene membrane can be modified by using oxide functional group derivatives [ 78 , 79 , 80 ]. The membrane modules often used in separation of mercury and heavy metals are hollow fibers and sheet layers [ 71 , 81 , 82 ].…”

Section: Membrane Separation For Mercury and Heavy Metalsmentioning

confidence: 99%

Graphene Oxide-Based Nanofiltration for Hg Removal from Wastewater: A Mini Review

Zunita

2021

Membranes

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Mercury (Hg) is one of heavy metals with the highest toxicity and negative impact on the biological functions of living organisms. Therefore, many studies are devoted to solving the problem of Hg separation from wastewater. Membrane-based separation techniques have become more preferable in wastewater treatment area due to their ease of operation, mild conditions and also more resistant to toxic pollutants. This technique is also flexible and has a wide range of possibilities to be integrated with other techniques. Graphene oxide (GO) and derivatives are materials which have a nanostructure can be used as a thin and flexible membrane sheet with high chemical stability and high mechanical strength. In addition, GO-based membrane was used as a barrier for Hg vapor due to its nano-channels and nanopores. The nano-channels of GO membranes were also used to provide ion mobility and molecule filtration properties. Nowadays, this technology especially nanofiltration for Hg removal is massively explored. The aim of the review paper is to investigate Hg removal using functionalized graphene oxide nanofiltration. The main focus is the effectiveness of the Hg separation process.

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“…Hence, developing perforated graphene membranes (with pore sizes in the sub‐nanometer range) is necessary to enable the effective transport of molecules through graphene membranes. [ 201,202 ] This strategy is expected to reduce the energy barrier for molecular transport drastically without jeopardizing the extraordinary mechanical properties of graphene sheets, as single‐layer graphene can withstand a pressure difference of up to 6 atm. [ 12,99 ] In particular, the performance of functionalized graphene monolayers has been attempted to verify through a molecular dynamics simulation.…”

Section: Physicochemical Properties Of Graphene‐based Materialsmentioning

confidence: 99%

Graphene‐Based Advanced Membrane Applications in Organic Solvent Nanofiltration

Nie

Chuah

Bae

et al. 2020

Adv Funct Materials

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Owing to the increasing need to mitigate excessive organic solvent waste, the efficient separation and recovery of organic solvents have received major research attention in recent years. The membrane‐based organic solvent nanofiltration (OSN) process has demonstrated its feasibility in addressing this problem with low energy costs, compared to conventional separation techniques, such as adsorption, liquid–liquid extraction, and solvent evaporation. Recently, membranes made of 2D graphene‐based materials have shown great promise because they attain high solvent flux and solute rejection using easy processing methods. Thus, this paper focuses on state‐of‐the‐art studies of graphene‐based membranes used in OSN processes, which include syntheses, characterizations, performance evaluations, membrane fouling, and simulation studies, in combination with the development of the “upper‐bound” line to indicate the performance of graphene‐based membranes. In this paper, critical challenges involved in the development of graphene‐based membranes are also focused on and discussed to map out the future directions of these membranes in industrial OSN processes. In addition to OSN, this paper pertains to a broader audience in other separation processes, particularly in the fields of gas separation and water treatment.

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Combustion Fabrication of Nanoporous Graphene for Ionic Separation Membranes

Cited by 69 publications

References 37 publications

Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth

Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth

Graphene Oxide-Based Nanofiltration for Hg Removal from Wastewater: A Mini Review

Graphene‐Based Advanced Membrane Applications in Organic Solvent Nanofiltration

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