4
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Covalent organic framework-modulated interfacial polymerization for ultrathin desalination membranes

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Covalent organic framework modulated interfacial polymerization enables the formation of ultrathin polyamide membrane for high-performance desalination.

          Abstract

          The demand for thin-film composite nanofiltration membranes bearing unprecedented water permeance and desirable salt rejection is ever increasing in desalination. Conventional interfacial polymerization usually generates a thick (∼100 nm) skin layer on hydrophobic substrate having low-porosity, leading to limited water permeance. Herein, we engineered a highly porous and superhydrophilic composite substrate to modulate the interfacial polymerization and generate an ultrathin polyamide skin layer, even below 10 nm. The composite substrate was constructed by depositing covalent organic framework nanosheets (CONs) on a microfiltration membrane via vacuum-assistant assembly. Owing to the highly porous structure and superhydrophilic nature of CONs, the composite substrate favored a high storage capacity and uniform distribution of the amine monomers. We manipulated the monomer storage capacity of the substrate by varying the loading content of CONs and demonstrated that higher amino monomer concentration could accelerate the self-sealing and self-termination of the interfacial polymerization, thus generating a thinner skin layer from ∼70 nm to sub-10 nm. Moreover, the highly porous structure of CONs imparted little additional water transport resistance. The sub-10 nm film composite membrane exhibited a superior water permeance of 535.5 L m −2 h −1 MPa −1 with a high rejection of 94.3% for Na 2SO 4, which was about 2–8 times higher than that of state-of-the-art nanofiltration membranes with comparable rejection.

          Related collections

          Most cited references46

          • Record: found
          • Abstract: found
          • Article: not found

          Porous, crystalline, covalent organic frameworks.

          Covalent organic frameworks (COFs) have been designed and successfully synthesized by condensation reactions of phenyl diboronic acid {C6H4[B(OH)2]2} and hexahydroxytriphenylene [C18H6(OH)6]. Powder x-ray diffraction studies of the highly crystalline products (C3H2BO)6.(C9H12)1 (COF-1) and C9H4BO2 (COF-5) revealed expanded porous graphitic layers that are either staggered (COF-1, P6(3)/mmc) or eclipsed (COF-5, P6/mmm). Their crystal structures are entirely held by strong bonds between B, C, and O atoms to form rigid porous architectures with pore sizes ranging from 7 to 27 angstroms. COF-1 and COF-5 exhibit high thermal stability (to temperatures up to 500 degrees to 600 degrees C), permanent porosity, and high surface areas (711 and 1590 square meters per gram, respectively).
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            The future of seawater desalination: energy, technology, and the environment.

            In recent years, numerous large-scale seawater desalination plants have been built in water-stressed countries to augment available water resources, and construction of new desalination plants is expected to increase in the near future. Despite major advancements in desalination technologies, seawater desalination is still more energy intensive compared to conventional technologies for the treatment of fresh water. There are also concerns about the potential environmental impacts of large-scale seawater desalination plants. Here, we review the possible reductions in energy demand by state-of-the-art seawater desalination technologies, the potential role of advanced materials and innovative technologies in improving performance, and the sustainability of desalination as a technological solution to global water shortages.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Maximizing the right stuff: The trade-off between membrane permeability and selectivity

                Bookmark

                Author and article information

                Contributors
                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                November 12 2019
                2019
                : 7
                : 44
                : 25641-25649
                Affiliations
                [1 ]Key Laboratory for Green Chemical Technology of Ministry of Education
                [2 ]School of Chemical Engineering and Technology
                [3 ]Tianjin University
                [4 ]Tianjin 300072
                [5 ]China
                Article
                10.1039/C9TA08163A
                5a4caafb-ac31-417b-bd8c-e4ab32c2e8e4
                © 2019

                http://rsc.li/journals-terms-of-use

                History

                Comments

                Comment on this article