Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 11, Pages 4951-4959Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4006989
Keywords
graphite oxide; urea; metal organic framework; composites; CO2 adsorption
Funding
- ARO [W911NF-10-1-0039]
- NSF [CBET 1133112]
- CSC (China Scholarship Council)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1133112] Funding Source: National Science Foundation
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New composites Cu-BTC MOF and graphite oxide modified with urea (GO U) are developed and tested as CO2 adsorbents at room temperature. The composite containing GO-U with the highest nitrogen content exhibits an excellent CO2 uptake (4.23 mmol/g) at dynamic conditions. The incorporation of GO-U into MOF changes the chemistry and microstructure of the parent MOF and results in synergistic features beneficial for CO2 retention on the surface. To identify these features the initial and exhausted materials were extensively characterized from the points of view of their porosity and chemistry. Although the adsorption forces are relatively strong, the results indicate that CO2 is mainly physisorbed on the composites at dry dynamic conditions at ambient temperature and pressure. The primary adsorption sites include small micropores specific for the composites, open Cu sites, and cage Window sites.
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