The collection of chemical hazards in liquids has drawn ever-increasing attentions for food safety and environment protection. The integration of filter membranes and metal-organic frameworks (MOFs) with superior adsorbability has opened a promising avenue. However, poor processability of MOFs puts significant barriers to improve concentration capability and develop hybrid membranes on demanded matrix membranes. Inspired by biomineralization, we proposed a strategy to grow pristine and ultrahigh-load MOFs on inert glass fibers (GF) to prepare GF@MOF (ZIF-8) hybrid membrane for effective concentration of organic hazards (OH) in water and organic solvents. BSA, as the biomineralization-mediator, was modified to GF via chemical modification to trigger the in-situ growth of MOFs. Comparing with conventional direct growth method with poor coverage of MOFs, this new method induced to continuous and dense coating of ZIF-8 on GF with a coverage rate of ~100%. Interestingly, besides of conventional particle-shape, ZIF-8 also presented sheet-flower- and wheatear-shape crystals. Surprisingly, the ZIF-8 in GF@ZIF-8 showed ultra-high adsorbability to malachite green (MG, 10000 mg L-1) up to 10000 mg g-1, while ZIF-8 powder analogues only reached the best of ca. 1667 mg g-1. In chloroform, the adsorbability of ZIF-8 in GF@ZIF-8 also reached 10000 mg g-1. Accordingly, a possible self-sacrificing mechanism was suggested. The hybrid membrane was further used to develop a filter device for MG aqueous solution (30 mg L-1) with an efficiency of 99% in 15 s. This novel method and mechanism may provide a new approach to MOF-based membrane fabrication for hazard collection.

Biomineralization-mimetic shape-adjustable growth of pristine and ultrahigh-load metal-organic frameworks on inert glass fibers to prepare hybrid membranes for collecting hazards in water/organic solvents

2019 Fall National Meeting

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