MXene-Coated Mesh Membrane with Underwater Superoleophobicity for High-efficiency Oil-water Separation†

doi:10.7503/cjcu20190025

Abstract

Abstract:

Owing to the hydrophilicity and flake-like structure of the two-dimensional(2D) MXene(Ti₃C₂T_x), the 2D MXene nanosheets were coated onto the stainless steel mesh to fabricate a novel hydrophilic and underwater superoleophobic mesh membrane with a corrugated micro- and nanostructure surface. For a series of oil-water mixtures, the MXene-caoted mesh membrane can achieve gravity-driven high-efficiency oil-water separation with excellent separation efficiency of over 99.99%, residual oil content of less than 4 mg/L in collected water, and water flux up to 57.52 L·m^-2·s^-1. In addition, MXene-coated mesh membranes display outstanding stability and cycleability.

Key words: 2D nanosheet, MXene-coated mesh membrane, Underwater superoleophobicity, Oil-water separation

TrendMD:

ZHANG Jianhui,ZHOU Jinya,LIN Haibo,LI Zhan,FANG Qianrong,XUE Ming,QIU Shilun. MXene-Coated Mesh Membrane with Underwater Superoleophobicity for High-efficiency Oil-water Separation^†[J]. Chem. J. Chinese Universities, 2019, 40(4): 624.

Figures/Tables 9

Fig.1 XRD patterns of MXene(a) and MXene nanosheets(b)(A), TEM image of MXene nanosheets(B) and FTIR spectra of MXene nanosheets(a) and MXene-coated mesh membrane(b)(C)The inset of image (B) is the Tyndall scattering effect in MXene colloidal solution in water.

Fig.2 SEM images of MXene-coated mesh membrane prepared on stainless steel mesh(500 mesh/28 μm)(A—D) The MXene-coated mesh membrane with different magnifications. The inset of image (A) shows the smooth surface of a neat mesh. (D) A single MXene-coated wire.

Fig.3 EDS mappings of Ti(A), C(B) and O elements(C) in MXene coated mesh membrane

Fig.4 3D(A1, A2) and 2D(B1, B2) AFM images of the bare thread of stainless steel mesh(A1, B1) and after MXene-coated(A2, B2)

Fig.5 Photographs of a water droplet(A) and an underwater oil droplet(B)(dichloroethane) on a neat mesh; a water droplet(C) and an underwater oil droplet (D)(dichloroethane) on the MXene-coated mesh membraneThe inset of image (D) is sliding angle.

Fig.6 Photographs of the oil-water separation process using a neat mesh(A) and a MXene-coated mesh membrane(B) Cyclohexane was dyed with Sudan Ⅲ for clear observation.

Fig.7 Oil-water separation performances of the MXene-coated mesh membrane(A) Residual oil content in the collected water and separation efficiency for a series of oil-water mixtures. a. Cyclohexane; b. pump oil; c. soybean oil; d. diesel; (B) the influence of different mesh number on water flux and intrusion pressure of oil(calculated by cyclohexane); (C, D) Separation efficiency and intrusion pressures of MXene-coated mesh membrane after immersing in various organic solvents for 7 d. a. Hex; b. DMSO; c. DCM; d. CCl4; e. DMF; f. TEA.

Fig.8 Separation efficiency for oil-water mixture of MXene-coated mesh membrane during ten cycles(A), separation efficiency for oil-water mixture of MXene-coated mesh membrane after heating treatment under different temperatures overnight(B) and photograph of oil column(cyclohexane) above a MXene-coated mesh membrane after heating treatment under 200 ℃ overnight(C)

Fig.9 SEM images of MXene-coated mesh membrane after using for 10 cycles(A, B), contact angle images of a water droplet(C) and an underwater oil droplet(D)(dichloroethane) on the MXene-coated mesh membrane after using for 10 cyclesThe inset of (B) is a photograph of oil droplets(dichloromethane) on MXene-coated mesh membrane in water after using for 10 cycles.

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