Ultra-superhydrophobic MOFs coated on polydopamine-modified polyethylene terephthalate for efficient removal of particulate matter

Abstract

To achieve ultra-low emissions in industrial flue gas, three different micro/nano metal–organic-framework (MOF) crystals (NH2-MIL-125, ZIF-8 and HKUST-1), as active purification units, were assembled on polydopamine (PoDA)-modified PET fibers (p-PET) by rapid, efficient, and supramolecular self-polymerization at room temperature to construct a novel superhydrophobic composite filter material (SH-Mp-PET(Ti, Zn, Cu)). The wrinkle structure and dielectric constant on the surface of SH-Mp-PET(Ti, Zn, Cu) filter fiber were improved by the synergistic effect of PoDA and MOF, and the charge effect on the surface of the three composite filter materials was improved, so that the electrostatic interaction between the fiber and the particles was improved. At the same time, the porous structure within the MOF did not result in significant pressure loss, and the purification quality factor (QF) of ultra-fine PM was significantly improved by the dual modification of RE and ΔP. The QF of three SH-Mp-PET(Ti, Zn, Cu) filter media were 22.9 %, 29.6 % and 28.1 % higher than PET, respectively. And SH-Mp-PET exhibited good thermal and mechanical stability. This approach can promote the development of industrials flue gas superhydrophobic filter materials and provides a new concept for developing MOF materials for flue gas treatment and reuse.