Enhanced antimony removal within lamellar nanoconfined interspaces through a self-cleaning MXene@CNF@FeOOH water purification membrane

Wan, Keming; Fang, Timing; Zhang, Wenliang; Ren, Guomei; Tang, Xiao; Ding, Zhezheng; Wang, Yan; Qi, Pengfei; Liu, Xiaomin

doi:10.1016/j.cej.2023.143018

Cited by 20 publications

(4 citation statements)

References 46 publications

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“…The present work is part of the trend of removal, recovery, recycling, and valorization of metals and metal ions with a severe impact on the environment through various techniques that include membrane [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Simultaneously Recovery of Thorium and Tungsten through Hybrid Electrolysis–Nanofiltration Processes

Man,

Albu,

Nechifor

et al. 2024

Toxics

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The recovery and recycling of metals that generate toxic ions in the environment is of particular importance, especially when these are tungsten and, in particular, thorium. The radioactive element thorium has unexpectedly accessible domestic applications (filaments of light bulbs and electronic tubes, welding electrodes, and working alloys containing aluminum and magnesium), which lead to its appearance in electrical and electronic waste from municipal waste management platforms. The current paper proposes the simultaneous recovery of waste containing tungsten and thorium from welding electrodes. Simultaneous recovery is achieved by applying a hybrid membrane electrolysis technology coupled with nanofiltration. An electrolysis cell with sulphonated polyether–ether–ketone membranes (sPEEK) and a nanofiltration module with chitosan–polypropylene membranes (C–PHF–M) are used to carry out the hybrid process. The analysis of welding electrodes led to a composition of W (tungsten) 89.4%; Th 7.1%; O2 2.5%; and Al 1.1%. Thus, the parameters of the electrolysis process were chosen according to the speciation of the three metals suggested by the superimposed Pourbaix diagrams. At a constant potential of 20.0 V and an electrolysis current of 1.0 A, the pH is varied and the possible composition of the solution in the anodic workspace is analyzed. Favorable conditions for both electrolysis and nanofiltration were obtained at pH from 6 to 9, when the soluble tungstate ion, the aluminum hydroxide, and solid thorium dioxide were formed. Through the first nanofiltration, the tungstate ion is obtained in the permeate, and thorium dioxide and aluminum hydroxide in the concentrate. By adding a pH 13 solution over the two precipitates, the aluminum is solubilized as sodium aluminate, which will be found after the second nanofiltration in the permeate, with the thorium dioxide remaining integrally (within an error of ±0.1 ppm) on the C–PHF–M membrane.

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Section: Resultsmentioning

confidence: 99%

Simultaneously Recovery of Thorium and Tungsten through Hybrid Electrolysis–Nanofiltration Processes

Man,

Albu,

Nechifor

et al. 2024

Toxics

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“…Studies have revealed that within a certain range, solvents can affect the microstructure of ILs and their properties. − The surface tension of ILs is highly sensitive to slight changes in concentration. − Therefore, understanding the variations in surface tension of mixtures is crucial. Researchers have employed experimental methods to investigate the interfaces of ILs and their mixtures. − Abolfazl Shojaeian conducted a detailed measurement of the surface tension of aqueous solutions of three kinds of ILs ([C n mim][BF 4 ]). The system’s surface tension exhibited a pronounced inflection at low ILs concentrations, displaying a nonlinear trend.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Inflection Point of Surface Tension in Aqueous Solution of Imidazolium-Based Ionic Liquids

Shan,

Zhou,

Sun

et al. 2024

J. Chem. Eng. Data

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An in-depth understanding of the interfacial structure is important to broadening the range of applications for ionic liquids (ILs). Interfacial properties of ILs depend on their intrinsic microstructure and interactions. The detailed structures at the interface can be obtained by molecular dynamics simulations at atomic levels. However, there are no clear conclusions about the liquid film thickness selection when modeling the liquid film systems. In this work, three aqueous solution systems with different liquid film thicknesses were investigated, and the relationship between the surface tension and water content was calculated and analyzed. The results indicate that a thicker liquid film leads to better agreement between the two relationships and the experimental data. Then, the thickest liquid film system was selected from the three different liquid film thicknesses. The bulk phase and interface of the IL aqueous system were treated separately. It is found that the IL content of the bulk phase was correlated with the surface tension. The results were more compatible with the experimental values. In addition, the work analyzed the atomic number density distribution and the angular distribution of alkyl chains in eight systems with varying concentrations. The concept of surface coverage of aqueous ILs was proposed and calculated with different concentrations. This helped to explain the reason for the inflection point in surface tension at low concentrations.

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“…However, the mechanical and alkaline stability of AEMs would reduce after excessive water absorption due to the increase of IEC. Therefore, some strategies have been developed to improve the performance of AEMs by developing the basic polymer materials [ 13 , 14 ], the topology of basic polymers [ 15 , 16 ], ion-exchange groups [ 17 , 18 ], and so on [ 19 , 20 , 21 ]. For example, He et al developed a series of highly conductive anion exchange membranes with branched ionic clusters for fuel cells [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

Gao,

Jin,

et al. 2024

Polymers

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As one of the most important sources for green hydrogen, anion exchange membrane water electrolyzers (AEMWEs) have been developing rapidly in recent decades. Among these components, anion exchange membranes (AEMs) with high ionic conductivity and good stability play an important role in the performance of AEMWEs. In this study, we have developed a simple blending method to fabricate the blended membrane ImPSF-PEGx via the introduction of a hydrophilic PEG into the PSF-based ionic polymer. Given their hydrophilicity and coordination properties, the introduced PEGs are beneficial in assembling the ionic groups to form the ion-conducting channels. Moreover, an asymmetric structure is observed in ImPSF-PEGx membranes with a layer of finger-like cracks at the upper surface because PEGs can act as pore-forming agents. During the study, the ImPSF-PEGx membranes exhibited higher water uptake and ionic conductivity with lower swelling ratios and much better mechanical properties in comparison to the pristine ImPSF membrane. The ImPSF-PEG1000 membrane showed the best overall performance among the membranes with higher ionic conductivity (82.6 mS cm−1 at 80 °C), which was approximately two times higher than the conductivity of ImPSF, and demonstrated better mechanical and alkaline stability. The alkaline water electrolyzer assembled by ImPSF-PEG1000 achieved a current density of 606 mA cm−2 at 80 °C under conditions of 1 M KOH and 2.06 V, and maintained an essentially unchanged performance after 48 h running.

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Enhanced antimony removal within lamellar nanoconfined interspaces through a self-cleaning MXene@CNF@FeOOH water purification membrane

Cited by 20 publications

References 46 publications

Simultaneously Recovery of Thorium and Tungsten through Hybrid Electrolysis–Nanofiltration Processes

Simultaneously Recovery of Thorium and Tungsten through Hybrid Electrolysis–Nanofiltration Processes

Insight into the Inflection Point of Surface Tension in Aqueous Solution of Imidazolium-Based Ionic Liquids

A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

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