Organic Nanobowls Modified Thin Film Composite Membrane for Enhanced Purification Performance toward Different Water Resources

Abstract

The structure and composition of nanofillers have a significant influence on polyamide nanofiltration (NF) membranes. In this work, an asymmetric organic nanobowl containing a concave cavity was synthesized and incorporated into a polyamide layer to prepare thin film nanocomposite (TFN) membranes via an interfacial polymerization process. Benefiting from the hydrophilicity, hollow cavity and charge property of the compatible organic nanobowls, the separation performance of the developed TFN membrane was significantly improved. The corresponding water fluxes increased to 119.44 ± 5.56, 141.82 ± 3.24 and 130.27 ± 2.05 L/(m2·h) toward Na2SO4, MgCl2 and NaCl solutions, respectively, with higher rejections, compared with the control thin film composite (TFC) and commercial (CM) membranes. Besides this, the modified TFN membrane presented a satisfying purification performance toward tap water, municipal effluent and heavy metal wastewater. More importantly, a better antifouling property of the TFN membrane than TFC and CM membranes was achieved with the assistance of organic nanobowls. These results indicate that the separation performance of the TFN membrane can be elevated by the incorporation of organic nanobowls.

Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

“…Various technologies have been applied for the treatment of radioactive liquid waste, such as precipitation, adsorption, membrane separation, and other methods [6][7][8][9][10][11]. Membrane methods for separating liquid mixtures have been intensively developed with promising results to resolve various scientific and environmental problems [12][13][14][15][16][17]. However, excellent ions rejection of membranes leads to a reduction in water permeability and vice versa [18], since smaller pore sizes always mean higher selectivity but limited water permeability [19,20].…”

Fabrication of Nanocomposite Membrane with Nanomaterial Filler for Desalination

“…On the other hand, when the salt rejection percentage reaches a high value, the water flux through the membrane decreases. This phenomenon has been seen in several studies [23,[25][26]. Of course, this is one of the main problems of this study.…”

“…Many cellulose-based membranes or other biopolymer-based membranes have been modified to improve the membrane performance [18][19][20][21]. Some of these studies showed good performance in terms of rejection of salt which reached above 90% [22][23][24]. On the other hand, when the salt rejection percentage reaches a high value, the water flux through the membrane decreases.…”

Polymeric Bowl‐Shaped Nanoparticles: Hollow Structures with a Large Opening on the Surface

“…Compared to closed hollow structures, the inner and outer surfaces of BNPs can be both exposed to the circumstance, endowing them with high specific surface areas and active sites. [14][15][16][17] Besides, the large opening (>10 nm) on the surface facilitates the facile encapsulation of large-sized cargoes such as nanoparticles and biomacromolecules, for example, DNAs and proteins. [18,19] The fabrication of inorganic BNPs including carbon spheres, [20][21][22] silica nanoparticles, [23] metal oxide nanoparticles, [24] and so forth, is mostly based on the template-assisted method.…”