The role of lateral size of MXene nanosheets in membrane filtration of dyeing wastewater: Membrane characteristic and performance. (May 2022)

• Record Type: Journal Article
• Authors: Xiang, Jing; Wang, Xingmin; Ding, Mingmei; Tang, Xiaomin; Zhang, Shixin; Zhang, Xianming; Xie, Zongli
• Is Part Of: Chemosphere. Volume 294(2022)
• Publication Date: 2022-05
• Subjects: MXene -- Nanosheet -- Lamellar membrane -- Lateral size -- Wastewater treatment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.133728
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract : New two-dimensional (2D) material MXene based lamellar membranes constructed from 2D MXene nanosheets have shown promising potential for water treatment with excellent selective property and high water flux. However, the effect of lateral size of MXene nanosheets on the membrane property and performance was rarely considered. Herein, the MXene nanosheets with different lateral size (552.3 nm, 397.5 nm and 281.8 nm) segregated via adjusting centrifugation conditions were used to prepare MXene membranes. XRD and cross-sectional SEM images confirmed that the resulting MXene membranes had the similar d-spacing and thickness. The MXene membrane with the smallest lateral size, MXene(S) -M, owned the largest surface roughness with reduced surface hydrophilicity. Lateral size determined mass transfer pathway and transfer resistance, which consequently influenced the water permeance and rejection of MXene membranes for dyeing wastewater treatment. MXene(S) -M with the shortest mass transfer pathway had the high water permeance while the MXene membrane with larger lateral size (MXene(L) -M and MXene(M) -M), possessing longer mass transport pathway, promoted high dye rejection. Graphical abstract: Image 1 Highlights: Lateral size played key roles in characteristic and performance of MXene lamellar membranes. Smaller lateral size resulted in larger surface roughness but slightly reduced hydrophilicity. Lateral size influenced the length of mass transfer pathway. Lateral size significantly affected water permeability and rejection of MXene membranes. MXene membrane with medium lateral size had good water permeability and rejection.