Abstract
The acanthosphere-like CuBDC (copper benzenedicarboxylate) porous clusters were successfully fabricated on stainless steel mesh (SSM) as a superhydrophilic membrane for highly efficient oil/water separation. Growth of CuBDC nanorods on SSM was achieved using CuSO4/H2O2-triggered polydopamine coating as both a stable binder and a nucleation layer. The micro-hierarchical structure of porous clusters CuBDC on SSM greatly enhanced the underwater superoleophobicity. The superhydrophilicity and underwater superoleophobicity was induced by water wetting on the membrane. The underwater superoleophobicity and trapped water layer on the rough surface led to outstanding oil/water separation performance. The separation efficiencies of the CuBDC mesh membrane were found to be higher than 99.95% for the immiscible light oil/water mixtures in 10 cycles and higher than 98.7% for heavy oil/water mixtures after 160 min of continuous flow. The average permeation water flux driven by gravity was 46,100 Lm−2 h−1 in 40 cycles. The membrane also demonstrated remarkable anti-fouling property against crude oil. The underwater superoleophobic CuBDC coated mesh was constructed in combination with surface chemistry of metal organic framework and roughness of porous clusters, which showed great potential in practical application as oil/water separation membranes.
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