Accession Number : AD1053442


Title :   Final Report: Air Purification: Nanostructured Media for Individual Protection


Descriptive Note : Technical Report,22 Mar 2010,30 Nov 2015


Corporate Author : Georgia Tech Research Corporation Atlanta United States


Personal Author(s) : Walton,Krista S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1053442.pdf


Report Date : 27 Jun 2016


Pagination or Media Count : 21


Abstract : Our extensive work on water adsorption of MOFs has led to understanding the stability problem in a holistic way, while examining methods to create MOFs with molecule-specific adsorption sites. As a result of this work, the thousands of MOFs reported in the literature can be more easily categorized for possible application in water-containing separations by evaluating the coordination environment and classifying the steric contributions from the linker. A main focus of this overall work was to evaluate MOFs for selective removal of ammonia from air. We found that UiO-66-OH has a capacity of 5.7 mmol/g for ammonia under dry conditions, which is close to ammonia removal goal of 6 mmol/g. However, we observed a decrease in the ammonia capacities of functionalized UiO-66 variations under humid conditions. The variants functionalized with COOH groups were evaluated for potential metal insertion sites for copper coordination. These new materials were shown to exhibit dynamic ammonia capacities of 6.8 and 6.4 mol/kg under dry and humid conditions, respectively. These capacities exceeded our project target of 6 mol/kg. Overall, it was established that balancing water adsorption behavior and high selectivity and high capacity for ammonia is crucial to developing new adsorbents for ammonia removal from air.


Descriptors :   dielectric gases , chemical engineering , water vapor , engineered materials , thermodynamics , statistical mechanics , porous metals , mass transfer , adsorbents , single crystals , filtration , nanostructures


Subject Categories : Physical Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE