Heterostructure membranes of high permeability and stability assembled from MXene and modified layered double hydroxide nanosheets

• DOI: 10.1016/j.memsci.2023.122100
• Publication Date: 2023-09-20T01:04:27Z
• Authors: Yahua Lu; Miao Zhang; Jian Chang; Anirban Sikdar; Naixin Wang; Quan-Fu An; Jiayin Yuan
• Keywords: Permeance; Nanoporous; Chemical Stability

Two-dimensional (2D) MXene-based lamellar membranes play transformative roles in membrane filtration technology. Their practical use water treatment is however hindered by several hurdles, e.g., unfavorable swelling due to weak interactions between adjacent MXene nanosheets, tortuous diffusion pathways of layered stacking, and the intrinsic aquatic oxidation-prone nature MXene. Herein, nanoporous 2D/2D heterostructure are elaborately constructed via solution-phase assembly oppositely charged modified double hydroxide (MLDH) nanosheets. As a multifunctional component, positively holey MLDH nanosheets were first tailor-made serve simultaneously as binder, spacer surface-modifier; next they intercalated into negatively lamella enhance structural stability mass transfer membranes. result, as-prepared MLDH@MXene successfully break persistent trade-off high permeability selectivity while mitigating common drawbacks 2D membranes, issues, restacking problems, vulnerable chemical stability. Noticeably, at an operating pressure 4 bar feed solution 100 ppm Congo red, enable threefold jump (332.7 ± 20 L m-2 h-1 bar-1) when compared pristine (119.3 18 bar-1), better operational without compromising rejection.