Tunable dextran retention of MXene-TiO ₂ mesoporous membranes by adjusting the 2D MXene content

Abstract

MXene-TiO2 mesoporous membranes on α-Al2O3 hollow fiber supports are prepared and regulated by adjusting the two-dimensional (2D) MXene content. The prepared MXene-TiO2 membranes are characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and x-ray diffraction. The results show that TiO2 nanoparticles (NPs) are uniformed deposited on 2D platforms and that the 2D structure of the original MXenes is still preserved in the film after calcination, thereby successfully inhibiting sol infiltration into the porous support. The obtained MXene-TiO2 layer with a controllable thickness exhibits ‘ideal’ pathways (longitudinal-lateral transport nanochannel) for dextran molecules between the TiO2 NPs and MXene nanosheets. Furthermore, the MXene-TiO2 membranes show higher rejection performance of dextran with increasing 2D MXene content. The optimal mesoporous MXene-TiO2 hollow fiber membranes exhibit a cut-off molecular weight (MWCO) of 14 854 Da and a high pure water flux of 102 l m−2 h−1 per bar, thereby showing good potential as high-performance interlayers for ceramic nanofiltration membranes.

Fabrication of Ag Nanosheet@TiO2 Antibacterial Membranes for Inulin Purification

“…Compared to materials in other topologies (such as zero-dimensional materials or bulk materials), two-dimensional materials have advantages in antimicrobial applications . Two-dimensional materials with all atoms on the surface have a large specific surface area, which makes them more effective in releasing bactericidal substances. For example, studies have shown that structural differences at the atomic scale may affect the biological activity of MXene with different stoichiometric ratios …”

2D MXene–TiO2 Core–Shell Nanosheets as a Data‐Storage Medium in Memory Devices

“…[ 19–23 ] However, MXene–TiO 2 composite materials have thus far been utilized only in photocatalysis, energy storage, sensor, and membrane applications. [ 24–27 ] In this study, we demonstrate deterministic controlled oxidation of multilayer Ti 3 C 2 T x MXene and the application of as‐prepared MXene–TiO 2 core–shell nanosheets as an excellent data storage medium in memory devices.…”

MXene Materials for Designing Advanced Separation Membranes

“…[92] In a related work, Sun et al later varied different parameters, such as the loading ratio of MXenes, dip-coating duration, and the duration and temperature of the calcination process. [117] For 1 and 5 wt% MXene incorporations, they observed only <20% and <40% decline in water flux, respectively. Notably, they could manipulate the molecular cut-off and pore size of TiO 2 -MXene membranes by playing with the rest of the parameters effectively.…”

“…Notably, they could manipulate the molecular cut-off and pore size of TiO 2 -MXene membranes by playing with the rest of the parameters effectively. [117] When it comes to the practicality of water treatment membranes, the resistance of membranes to fouling is equally critical. On many occasions, a fast-fouling membrane has a limited chance for practical applications, if any.…”