MOF-808 on Polyacrylonitrile Nanofibers for Degradation of Chemical Warfare Agents

Abstract

Highly efficient and reusable protective materials for chemical warfare agents (CWAs) are in high demand. Here, we used a surface modification technique to develop a material that provides chemical protection. Using an electrospun polyacrylonitrile (PAN) nanofiber membrane as the substrate, we modified the surface of the nanofiber with dopamine hydrochloride, which self-polymerized to form a polydopamine (PDA) surface layer, onto which we loaded metal–organic framework (MOF-808) particles. The presence of PDA on the surface of the PAN nanofibers significantly increased the breaking strength (2-fold increase) and elongation (9-fold increase) of the nanofiber membrane. Moreover, the PDA functionalities formed coordination sites to trigger the in situ growth of MOF-808 particles on the surface of the nanofiber membrane, thereby considerably increasing the growth rate and loading capacity. The surface of the nanofiber membrane was completely covered with MOF-808 particles following solvothermal treatment for 16 h. The MOF-808/PAN/PDA composite membrane could rapidly degrade 99.9% of dimethyl-4-nitrophenyl phosphate to p-nitrophenol within 8 min. After the membrane was used several times, the conversion rate stabilized at 95.9%, indicating that the MOF-808/PAN/PDA composite membrane has significant potential for application as protective clothing for CWAs.

Zr-MOF Nanosheets Vertically Grown on Fabrics for Rapid Catalytic Elimination of Nerve Agent Simulants

“…The turnover frequency (TOF) is calculated per Zr 6 cluster at t 1/2 . The TOF of MOF-808 composites is from 0.00235 to 0.335 s –1 due to the difference in the loading ways, ,− and the TOF of PP/MOFNS-3 can achieve 0.0429 s –1 , which is better than many MOF-808 composites.…”

Solution Blow Spinning Ultrafine Fiber Sponge-Loaded MOF-808 for Effective Adsorption and Degradation of Mustard Gas

“…Among them, zirconium-based materials, such as Zr (OH) 4 , and zirconium-based MOFs (MOF-808, UIO-66-NH 2 , NU-1000, etc.) have been extensively studied owing to their highly acidic Zr IV sites. − Fabrics loaded with zirconium-based metal compounds have become a hot research topic in recent years. For example, Liao et al prepared a Zr (OH) 4 nanosheet-assembled nanofiber membrane which shows catalytic performance to degrade dimethyl methylphosphonate, with a half-life of 4 min; Zhang et al incorporated UIO-66-NH 2 onto polyacrylonitrile nanofibers, where 2-chloroethyl ethyl sulfide (CEES) can be removed efficiently up to 97.7% after 48 h by reaction and adsorption; and Ma et al fabricated polyester fiber composites with MOF-808 coating that can efficiently degrade soman with half-lives of 8 min .…”

Morphology Regulation of UiO-66-2I Supporting Systematic Investigations of Shape-Dependent Catalytic Activity for Degradation of an Organophosphate Nerve Agent Simulant

“…Zirconium-based MOFs (Zr-MOFs), consisting of organic linkers and Zr 6 (μ 3 -O) 4 (μ 3 -OH) 4 (H 2 O) 4 (OH) 4 (Zr 6 ) nodes, have the unique potential for removal of nerve agents as both adsorbents and hydrolysis catalysts stem from their permanent porosities, immense structural diversity, exceptional stability, and intrinsic Lewis acidity. − Moreover, a number of representative Zr-MOFs, such as NU-1000, , MOF-808, , and NU-912-I, , as well as their composites with fibrous membranes/fabrics, have demonstrated high catalytic activity for the cleavage of the phosphate bonds in a liquid-type buffer, pure water, or at specific humidity conditions. − For instance, MOF-808/fiber composites can effectively degrade GD with half-lives of 2 min, improving the application of MOFs in practical protection. − Additionally, several key factors of Zr-MOFs, especially the micropore environment, pore size, defect, etc., control the diffusion rate of reactants and affect the microsolvation environment and accessibility of the Zr 6 active site, which in turn determine the catalytic performance. , To date, most studies in this field have focused on designing Zr-MOFs with different topologies, defects, and functional group modifications (amino, halogen, etc.) to improve the catalytic performance.…”