Teresa J. BandoszThe City College of New York, USA
Dr. Bandosz has Ph.D. in Chemical Engineering (Krakow Polytechnic) and D.Sci. in Physical Chemistry (Maria Curie-Sklodowska University). She is a full professor of Chemistry and Chemical Engineering at the City College of New York. Dr. Bandosz has a broad experience in the field of materials preparation, and their applications to environmental problems related to development of adsorbents for gas separation. For three years she was associated with Dalian University of Technology in China as a sky scholar/ guest professor of Chemical Engineering. Dr. Bandosz is a Fulbright Senior Scholar (2016/2017). She edited the book “Activated carbon surface in environmental remediation,” published by Elsevier (2006). Her work during last 25 years has resulted in 6 US patents and over 350 publications in peer-reviewed journals. Her recent research interests include synthesis of Graphene/ MOF, Graphene/hydroxide composites for separation and energy harvesting applications, visible light photoactivity of carbonaceous materials, energy storage, and CO2 sequestration and reduction. Since 2014 she is coeditor of Journal of Colloid and Interface Science. She is also on the Advisory Board of American Carbon Society, on the Board of Directors of International Adsorption Society and on the Editorial Boards of Carbon, C, Adsorption Science and Technology and Applied Surface Science.
Title：MOF/Graphene composites as gas separation media
SymposiumEnvironmental Protection
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Abstract
Metal Organic Frameworks (MOF) and graphite oxide (GO) are materials, which have recently gained a considerable attention of scientists. While the former exhibit well-defined crystallographic structure and developed porosity, the latter are the precursors of graphene and, owing to the easiness of their surface modification, they are used in various composite structures. Even though MOFs are highly porous, the dispersion forces governing adsorption are rather weak when adsorption of small molecules is a target. This directed our attention to building the MOF/GO composites where MOF components would provide porosity and unsaturated metal sites and GO would increase the dispersive forces owing to the dense array of carbon atoms. The composites addressed in this presentation consist of GO, either as received or modified with amines and zinc- and copper-based MOF. They were used as adsorbents of toxic gases such as NH3, H2S, and NO2 . CO2 capture at high pressure was also tested on these materials. The results showed the superior performance of the composites over the parent MOF in terms of the amount adsorbed, the heat of adsorption, and adsorption selectivity. The enhanced performance is linked to the formation of new porosity at the interface between MOF and GO and to an increased level of surface heterogeneity. The functional groups of GO, either oxygen or nitrogen containing, are involved in the chemical bonds with MOF units. This increases the porosity in very small pores, similar in size to target molecules, and provides new reactive centers. While the structure of the composites collapses as a result of reactive adsorption of toxic gases, the CO2 adsorption performance shows very good cyclibility, easiness of regeneration, and high selectivity over CH4 and N2 .A very important asset of these adsorbents is their good performance as separation media for both, acidic and basic gases which are detrimental for the environments.
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