In Situ Electrospun Porous MIL-88A/PAN Nanofibrous Membranes for Efficient Removal of Organic Dyes

Abstract

In recent years, metal–organic framework (MOF)-based nanofibrous membranes (NFMs) have received extensive attention in the application of water treatment. Hence, it is of great significance to realize a simple and efficient preparation strategy of MOF-based porous NFMs. Herein, we developed a direct in situ formation of MOF/polymer NFMs using an electrospinning method. The porous MOF/polymer NFMs were constructed by interconnecting mesopores in electrospun composite nanofibers using poly(vinylpolypyrrolidone) (PVP) as the sacrificial pore-forming agent. MOF (MIL-88A) particles were formed inside the polyacrylonitrile (PAN)/PVP nanofibers in situ during electrospinning, and the porous MIL-88A/PAN (pMIL-88A/PAN) NFM was obtained after removing PVP by ethanol and water washing. The MOF particles were uniformly distributed throughout the pMIL-88A/PAN NFM, showing a good porous micro-nano morphological structure of the NFM with a surface area of 143.21 m2 g−1, which is conducive to its efficient application in dye adsorption and removal. Specifically, the dye removal efficiencies of the pMIL-88A/PAN NFM for amaranth red, rhodamine B, and acid blue were as high as 99.2, 94.4, and 99.8%, respectively. In addition, the NFM still showed over 80% dye removal efficiencies after five adsorption cycles. The pMIL-88A/PAN NFM also presented high adsorption capacities, fast adsorption kinetics, and high cycling stabilities during the processes of dye adsorption and removal. Overall, this work demonstrates that the in situ electrospun porous MOF/polymer NFMs present promising application potential in water treatment for organic dyestuff removal.

Flame‐Retardant Properties and Characterization of Nylon/Tannic Acid Electrospun Fibers

“…Analysis of the condensed phase pyrolysis can give valuable insights into the mechanism of flame resistance for polymer systems. [15,16,[50][51][52][53][54] Condensed phase analysis was performed on electrospun mats by analyzing the residue using ATR-IR after holding mats to elevated temperatures for 15 min using TGA. Figure 6 gives the IR spectra of mats prepared with 100 rel.…”

A simple synthesis of a guaiacol based reactive flame retardant and its application in epoxy resins

“…In the gas phase, with the increase of combustion temperature, the decomposition of PGD produces catechol radicals, • PO 2 , • PO, and other benzene radicals, which are rapidly released to capture the • H and • OH radicals produced by the combustion of FREP to play the role of the quenching effect. 2,38 Meanwhile, the incomplete combustion of FREP generates non-flammable gases to reduce combustible gas concentration during the combustion process. In the condensed phase, the phosphorus-containing substances generated by the decomposition of PGD promote the dehydration of polymer chains to form a stabilized graphitized carbon layer containing a P-crosslinked structure, thus inhibiting the exchange of heat, oxygen and volatile substances.…”

Effect of polycarbonate‐polydimethylsiloxane block copolymer and two commercial toughening agents on the flame retardancy and smoke emission of rigid polyvinyl chloride

“…They form a hard and dense carbon layer that can limit the further decomposition of the matrix and retain a more complete matrix. 37,38 In contrast, the addition of other toughening agents breaks down this intermolecular crosslinking, resulting in fewer and looser carbon residues. In addition, PVC/ACR and PVC/PC-b-PDMS samples have a distinct difference in their color, although the morphology of the carbon residues is similar.…”

“…This is due to the intermolecular crosslinking that occurs in PVC and PVC/CPE during combustion. They form a hard and dense carbon layer that can limit the further decomposition of the matrix and retain a more complete matrix 37,38. In contrast, the addition of other toughening agents breaks down…”