Thin film nanocomposite polyamide membrane doped with amino-functionalized graphene quantum dots for organic solvent nanofiltration

Recent Developments in Nanocomposite Membranes Based on Carbon Dots

“…More importantly, the interactions between amine monomers and CDs are diverse due to the characteristics of amine monomers and CDs, providing a broader possibility for membrane structural regulation. MPD aGQDs smoother thinner --J = 3.80 L m −2 h −1 bar −1 (ethanol, increased by 44%) RRDB = 99.0%; solvent resistance NF [52] af-GQDs smoother thinner --J = 9.76 L m −2 h −1 bar −1 (ethanol); RRDB = 98.0%; OSN [53] GQDs smoother thinner --J = 22.6 L m −2 h −1 bar −1 (ethanol); RRDB = 98.0%; solvent resistance NF [54] af-GQDs smoother thinner J = 13.5 L m −2 h −1 bar −1 (methanol); J = 6.98 L m −2 h −1 bar −1 (ethanol); J = 11.2 L m −2 h −1 bar −1 (dimethyl formamide); RRDB = 99.2%; OSN [55] GQDs smoother ultrathin improved increased J = 32.1 L m −2 h −1 bar −1 ; RNa2SO4 = 99.6%; selectivity of Cl − /SO4 2− = 205.8; desalination [56] NH2-GOQDs smoother -improved unchanged J = 13.3 L m −2 h −1 bar −1 , reverse salt flux = 6.0 g −2 h −1 (2 bar); FO [57] N-GOQD smoother unchanged improved -J = 1.7 L m −2 h −1 bar −1 ; RNaCl = ~93%; RO [58] GQDs smoother -improved -J = 30.9 L m −2 h −1 , reverse solute flux = 0.12 g L −1 ; FO [59] CQDs-EA rougher thicker improved -J = 5.50 L m −2 h −1 bar −1 (increased by 42.1%); RNaCl = 98.0%; brackish water desalination [60] GQD-NH2 rougher thinner improved -J = 11.1 L m −2 h −1 bar −1 (methanol); J = 5.9 L m −2 h −1 bar −1 (dimethyl formamide); OSN [61] Na + -CQDs rougher thinner --J = 3.84 L m −2 h −1 bar −1 ; RNaCl = 98.6%; J = 1.13 L m −2 h −1 bar −1 ; RNaCl = 96.7%; brackish water desalination [ The thinner and smoother membrane surface is ascribed to the low diffusion rate of PIP caused by the incorporated CDs (Figure 3). The electrostatic repulsion or hydrogen bonding between cationic amine monomers and cationic CDs arouses greater resistance for amine monomers to diffuse deep into the organic phase [39,45,61].…”

Methanol recovery: potential of nanolaminate organic solvent nanofiltration (OSN) membranes

“…So far, various nanomaterials have been utilized in OSN, including 0D (graphene quantum dot, metal-based chalcogenide, nano-aggregate, etc . ), 7–9 1D (carbon nanotube, etc . ), 2D nanomaterials (graphene, graphene oxide (GO), metal–organic framework (MOF), covalent organic framework (COF), hexagonal boron nitride (hBN), MoS 2 , MXene, etc .…”

Recent advances in the fabrication of organic solvent nanofiltration membranes using covalent/metal organic frameworks

“…Over the years, diverse materials have been employed for the preparation of OSN membranes including polymers and biopolymers including cellulose, 16 chitosan 17,18 and alginate, 19 graphene, 20 carbon nanotubes (CNTs), 21 layered double hydroxides, 22 cyclodextrin, 23 MXene, 24 and so on. Besides, researchers have investigated the development of nano-scale selective layers based on a variety of stable porous materials, including MOFs and COFs, to fabricate thin film membranes.…”