Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 4, Pages 1850-1858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c05583
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Funding
- National Natural Science Foundation of China [51973199, U1704139]
- China Postdoctoral Science Foundation [2018M642796]
- Key Science and Technology Program of Henan Province [182102310013, 192102210178]
- Training Plan for Young Backbone Teachers in Universities of Henan Province [2017GGJS002]
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The study developed a membrane with enhanced separation performance and self-cleaning ability by embedding hydrophilic Zr-porphyrin metal-organic frameworks of different dimensions in the active layer. The optimized membrane showed excellent dye removal, high water permeate flux, and outstanding photocatalytic self-cleaning ability.
The self-cleaning ability and reusability of a membrane are critical in practical applications because they can severely affect the lifespan and the separation efficiency of the membranes. In this work, hydrophilic Zr-porphyrin metal-organic frameworks (MOFs) with different dimensions (2D or 3D) were embedded in the polyamide active layer to develop a self-cleaning membrane with enhanced separation performance. Zr-porphyrin MOF (3D) with excellent photocatalytic activity and uniform 1D open triangular channels can not only endow this membrane with visible-light photocatalytic ability for the degradation of organic dyes deposited on the membrane surface but also provide additional transport channels leading to a high membrane permeate flux. The optimum membrane exhibits a superior water permeate flux of 110.4 L m(-2) h(-1) (threefold higher than the pristine thin-film composite membrane) while maintaining very high dye rejection (close to 100%) for five dyes (anionic dyes: Congo red, Direct red 23, and Reactive Black 5 and cationic dyes: methylene blue and rhodamine B) and an outstanding photocatalytic degradation self-cleaning ability (the recovery of water permeate flux exceeds 97% after 4 cycles). Overall, this study may offer new inspiration for designing and tuning Zr-porphyrin MOF-based self-cleaning membranes with excellent dye removal ability.
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