Inorganic–Organic Hybrid Membrane Based on Pillararene‐Intercalated MXene Nanosheets for Efficient Water Purification

Abstract

Discharge of antibiotic-containing wastewater causes environmental pollution and threatens biological and human health. An efficient treatment method for this wastewater is urgently required. We prepared inorganic-organic hybrid MXene-pillararene nanosheets with a large lateral size (5-8 μm). The hybrid nanosheets were stacked on supports via vacuumassisted filtration to prepare membranes with regular parallel slits and an interlayer spacing of 1.36 nm, which were used to purify antibiotic-containing water. Permeance through the membrane increased 100-fold compared with most polymeric and other two-dimensional nanofiltration membranes with similar rejection. This high permeance and rejection was attributed to the large lateral size of the nanosheets, regular interlayer spacing, and electrostatic interaction between the membrane and antibiotics. These membranes will broaden the applications of lamellar materials for the separation of highvalue-added drugs in academia and industry.

Construction of a Bi2MoO6/CoOx/Au system with a dual-channel charge transfer path for enhanced tetracycline degradation

“…Nevertheless, with the overuse of TC and the wanton discharge of pharmaceutical wastewater, TC released into aquatic environments gradually accumulates, which poses an adverse effect on the ecosystem and public health. [1][2][3][4][5] Fortunately, photocatalytic technology, a type of advanced oxidation process, offers a promising avenue for the elimination of residual TC in wastewater due to high efficiency, cost-effectiveness, and environmental friendliness. [6][7][8][9][10] Bismuth molybdate, which possesses a distinctive layered structure and suitable bandgap, has been reported as a promising two-dimensional (2D) photocatalyst for antibiotic degradation under visible light.…”

Highly Efficient Ion Sieving Through Angstrom-Scale Channels Embedded With Supramolecular Coordination Complexes

“…[10][11][12][13][14][15][16][17][18][19][20][21][22] Arti cial solid state channels are usually designed by functionalizing the inner surfaces of channels with speci c molecules. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] The resulting channels can exhibit gating responses such as opening and closing in reaction to external stimuli. However, the gating effects of these channels are typically very weak because they tend to be relatively large compared with ions and thus are not able to completely block ion transport even in the closed state.…”

Facile Ionization of the Nanochannels of Lamellar Membranes for Stable Ionic Liquid Immobilization and Efficient CO2Separation

“…Over the past decade, growing importance is being attached to the lamellar membranes with two-dimensional (2D) nanochannels for the elaborate design of next-generation separation membranes. − A series of 2D nanomaterials with atomic thickness and micrometer lateral dimensions, including graphene and graphene oxide (GO), , 2D transition metal carbides, carbonitrides or nitrides (MXene), transition metal dichalcogenides (TMDs), hexagonal boron nitride, layered double hydroxides, and those with well-designed microporosity, , have been strategically explored for the construction of lamellar membranes. The transport of molecules and/or ions in the lamellar membranes is routinely thought to occur in the confined space of nanochannels, where the microenvironment, such as channel size and chemical affinity, has a great impact on how the molecules and/or ions transfer. ,, In comparison with conventional inorganic membranes, 2D lamellar membranes show great potential in ion sieving, , oil and water separation, and water purification fields, , on account of easy large-scale fabrication, , preeminent mechanical and thermal properties, and high performance. , However, despite the extraordinary application prospects, there are still some unresolved issues limiting their practical applications in the field of gas separation, especially in CO 2 capture, which has elicited global concern . One is the undesired defects produced from nonuniform stacking of nanosheets, which often cause severe loss of selectivity at quite low concentration. , Another is the tiny difference of molecule dynamic diameter between CO 2 (0.33 nm) and N 2 (0.36 nm), which raises the difficulty of size-dependent separation and requires appropriate chemical affinity for selective adsorption and diffusion of CO 2 . , …”