Highly efficient separation of organic substances from high salinity brine by nanofiltration

Li, Yahui; Wang, Dingsheng; Wang, Junfeng; Nie, Yi

doi:10.1016/j.desal.2022.115738

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Many IEMs for electrochemical separation systems have been designed for inorganic ions and have been studied with relatively simple binary or ternary mixtures. However, in practical biomanufacturing and fermentation processes, value-added organic species such as proteins and organic acids are often present in much more complex mixtures, in the presence of multicomponent inorganic and neutral molecules. − There is a lack of comprehensive research focused on their recovery from multicomponent mixtures or organic species. Recently, an LBL multilayer-modified AEM was integrated into a redox electrodialysis platform to selectively separate organic acids, such as succinic acid (Figure c) .…”

Section: Membrane-driven Electrochemical Separationmentioning

confidence: 99%

Molecularly Selective Polymer Interfaces for Electrochemical Separations

Kim,

Oh,

Knust

et al. 2023

Langmuir

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The molecular design of polymer interfaces has been key for advancing electrochemical separation processes. Precise control of molecular interactions at electrochemical interfaces has enabled the removal or recovery of charged species with enhanced selectivity, capacity, and stability. In this Perspective, we provide an overview of recent developments in polymer interfaces applied to liquid-phase electrochemical separations, with a focus on their role as electrosorbents as well as membranes in electrodialysis systems. In particular, we delve into both the single-site and macromolecular design of redox polymers and their use in heterogeneous electrochemical separation platforms. We highlight the significance of incorporating both redox-active and non-redox-active moieties to tune binding toward ever more challenging separations, including structurally similar species and even isomers. Furthermore, we discuss recent advances in the development of selective ion-exchange membranes for electrodialysis and the critical need to control the physicochemical properties of the polymer. Finally, we share perspectives on the challenges and opportunities in electrochemical separations, ranging from the need for a comprehensive understanding of binding mechanisms to the continued innovation of electrochemical architectures for polymer electrodes.

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Section: Membrane-driven Electrochemical Separationmentioning

confidence: 99%

Molecularly Selective Polymer Interfaces for Electrochemical Separations

Kim,

Oh,

Knust

et al. 2023

Langmuir

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“…In addition, in the ED desalination process, organic substances diffuse into concentrated solution through IEMs along with the migration of salt ions and water molecules . The diffusion of organic substances leads to contamination of the concentrated salt, which cannot guarantee the purity of salt …”

Section: Introductionmentioning

confidence: 99%

“…6 The diffusion of organic substances leads to contamination of the concentrated salt, which cannot guarantee the purity of salt. 7 In order to control the permeation of organic matter through IEMs, various treatment methods have been developed. For example, before ED desalination, coagulation, 8 adsorption, 9 advanced oxidation process, 10 and other pretreatment 11 were carried out on the high salinity organic wastewater to remove part of the organic matter and reduce the concentration of organic matter in the wastewater, so as to reduce the permeation of organic matter through the IEM.…”

Section: Introductionmentioning

confidence: 99%

Salt-Water-Organic Transport Nexus and Mechanisms through Cation Exchange Membranes: Effect of Membrane Sulfonation Degree

Lü

Lin²,

Yang

et al. 2023

Ind. Eng. Chem. Res.

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Organic permeation through an ion exchange membrane is an urgent problem to be solved in electrodialysis (ED) processes on treating industrial wastewaters. However, how the salt, water, and organic compounds co-transport in an ED stack is still unclear. To reveal this, a series of cation exchange membranes (CEMs) were prepared in this work by using sulfonated polysulfone with different sulfonation degrees as a tool to “adjust” membrane water uptake and “control” water migration. The results showed that CEMs with a high sulfonation degree had positive correlation with desalination performance. Salt migration led to organic matter migration, while the presence of small molecule organics reduced the water flux and elevated the sodium flux, which favored the ED process. It was proven that the membrane sulfonation degree could be an important tool to adjust water permeation, and as a consequence, to improve the separation performance of salt from organic compounds in wastewater.

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