Abstract
In the past decades, membrane technology has been widely utilized in various separation processes, because of their low-energy consumption, low-cost, reliability, and scalability when compared with conventional separation processes like distillation, extraction, or crystallization (Sholl and Lively in Nat News 532:435–437, 2016; Yang et al. in Chem Soc Rev 49:5359–5406, 2020). In order to further increase the competitiveness, intensive efforts have been made from improving the separation efficiency of existing membrane processes to exploring new applications. As the core part, membrane materials with high permeability, high selectivity, and high stability are extremely desired since they can significantly accelerate the practical application of membrane technology.
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In the past decades, membrane technology has been widely utilized in various separation processes, because of their low-energy consumption, low-cost, reliability, and scalability when compared with conventional separation processes like distillation, extraction, or crystallization [1, 2]. In order to further increase the competitiveness, intensive efforts have been made from improving the separation efficiency of existing membrane processes to exploring new applications. As the core part, membrane materials with high permeability, high selectivity, and high stability are extremely desired since they can significantly accelerate the practical application of membrane technology [3, 4]. To date, plenty of membranes with different pore sizes have been developed, such as polymer membrane, ceramic membrane, two-dimensional (2D) lamellar membrane, molecule sieving membrane, hybrid membrane, and composite membrane [5,6,7,8,9,10]. These membranes have been widely used for different separation processes including, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, gas separation, and proton/ion conduction, etc. [11, 12].
For each category of membrane, the physical and chemical environments of transfer channels are of great importance in manipulating the comprehensive properties. The physical environments are dictated by the connectivity, tortuosity, and size of transfer channels, while the chemical environments are dictated by the type, amount, and distribution of functional groups within transfer channels [13]. Generally, ideal transfer channels should integrate the following attributes: (i) they should be short with appropriate transfer environment to endow membranes with high permeability, (ii) the channel size distribution should be narrow to endow membranes with high selectivity, and (iii) the chemical and mechanical stability should be high to endow membranes with long-term operation stability [14]. Currently, polymers are the dominant membrane materials, due to their easy processability and high scale-up capability. For conventional polymer membranes, breaking the permeability–selectivity or permeability–stability trade-off remains a challenge. The great progress in polymer membranes over the past decades has brought about the booming of novel kinds of structured membranes including, hybrid membrane, composite membrane, and phase-separated membrane, which push the separation performances of polymer membranes to new records [15,16,17,18].
Hybrid membrane is an intricately structured membrane configuration, owing to its merit of coupling the good flexibility and processability of polymers with the regular topological structure as well as the tunable functionality of fillers [19, 20]. Impermeable fillers such as silica particles, graphene oxide (GO) nanosheets, and organic/inorganic nanorods can induce a distortion of chain alignment to improve the free volume property or induce the construction of long-range, ordered transfer channels in membrane [21, 22]. Permeable fillers such as metal–organic frameworks (MOFs), covalent organic frameworks (COFs), and zeolite can afford additional transfer pathways and mechanisms to membrane including, molecule sieving, and selective adsorption [23, 24].
Composite membrane for molecule transfer is generally a heterogeneous membrane with dense separation layer and porous support layer, where the separation layer and the support layer can be separately optimized to achieve simultaneously high separation performance and stability [25, 26]. Particularly, the fabrication of composite membrane with an ultrathin separation layer is deemed as a delicate strategy to achieve highly permeable membrane, which is one of the most important pursuits for membrane technology [27, 28]. At present, researches related to composite membranes mainly focus on the precise manipulation of physical structure and chemical component of separation layer; however, these remain challenging due to the pursuit of ultrathin thickness. For proton/ion separation, electrospinning is increasingly recognized as a powerful mean for introducing unique phase-separated architectures into composite membranes [29]. Indeed, it allows the elaboration of composite membranes with a rather facile mean to control of the long-range organization/distribution/percolation of hydrophilic and hydrophobic domains of the ionomer by adjusting the type of electrospun material, the volume fraction of nanofibers, and the experimental conditions [30]. Moreover, electrospinning can impart uniaxial alignment of polymer chains within nanofibers, resulting in enhanced mechanical properties. Importantly, it can promote the formation of interconnected transfer channels, which facilitate the improvement in proton/ion conduction [31].
In recent years, 2D nanosheets, with a thickness of one to a few atoms, have become the promising building blocks for advanced membranes [32]. Moreover, the nanosheets can be designed with precise pore size along with targeted chemical functionality, enabling their extraordinary physical or chemical selectivity [33]. Through a facile filtration process, 2D lamellar membranes can be fabricated with either porous or nonporous nanosheets. The transfer channels based on nonporous nanosheets refer to the interlayer channels of lamellar membranes, differing from the pores of porous nanosheet-based lamellar membranes [34]. To date, a large number of nonporous nanosheets have been developed including, graphene oxide (GO), hexagonal boron nitride (h-BN), MXenes, transition metal dichalcogenides (TMDs), layered double hydroxides (LDHs), etc., most of which are easy to fabricate. For 2D lamellar membranes fabricated with nonporous nanosheets, the researchers are mainly concentrated on controlling the physical structure and chemical component of interlayer channels. However, the interlayer channel is usually tortuous. To this end, intrinsically porous nanosheets are developed. The transfer channels based on this kind of nanosheet refer to the channels from the intrinsic pores on nanosheets [35]. Intrinsically porous nanosheets can be 2D zeolites, 2D MOFs, 2D COFs, etc.
In this work, we focus on the application of membrane technology on organic solvent nanofiltration, hydrogen fuel cell, and lithium ion battery. We prepared several kinds of membranes, including hybrid membrane, composite membrane, nanofiber composite membrane, and 2D lamellar membrane, and the microstructure and performance of membrane were efficiently manipulated. In addition, the relevant transfer/separation mechanisms were deeply studied, and the transfer model equations were established. For organic solvent nanofiltration, the category of membrane mainly contains hybrid membrane, composite membrane, and 2D lamellar membrane. For hydrogen fuel cell, the category of membrane mainly includes hybrid membrane, nanofiber composite membrane, and 2D lamellar membrane. With respect to lithium ion or lithium–sulfur battery, hybrid membrane and 2D lamellar membrane are investigated in detail. The microstructures and performances as well as the structure-performance relationships of membranes are systematically investigated. Based on this, we preliminarily disclose the mass transfer mechanism in confined spacing and obtain a series of high-performance membranes and membrane materials. Hopefully, this work will offer some guidance on the design of advanced membranes with diverse transfer channels for applications in separation, catalysis, energy conversion, and storage, etc.
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Wang, J., Wu, W. (2023). Introduction to Membrane. In: Wang, J., Wu, W. (eds) Functional Membranes for High Efficiency Molecule and Ion Transport. Springer, Singapore. https://doi.org/10.1007/978-981-19-8155-5_1
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DOI: https://doi.org/10.1007/978-981-19-8155-5_1
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