Journal
CHEMPHYSCHEM
Volume 11, Issue 17, Pages 3678-3684Publisher
WILEY-BLACKWELL
DOI: 10.1002/cphc.201000689
Keywords
adsorption; composites; desulfurization; graphene; metal-organic frameworks
Funding
- ARO (Army Research Office) [W911NF-10-1-0030]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0754945] Funding Source: National Science Foundation
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Composites of a copper-based metal-organic framework (MOF) and graphite oxide (GO) were tested for hydrogen sulfide removal at ambient conditions. In order to understand the mechanisms of adsorption, the initial and exhausted samples were analyzed by various techniques including X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analyses, and sorption of nitrogen. Compared to the parent materials, an enhancement in hydrogen sulfide adsorption was found. It was the result of physical adsorption of water and H(2)S in the pore space formed at the interface between the MOF units and the graphene layers where the dispersive forces are the strongest. Besides physisorption, reactive adsorption was found as the main mechanism of retention. H(2)S molecules bind to the copper centers of the MOF. They progressively react with the MOF units resulting in the formation of copper sulfide. This leads to the collapse of the MOF structure. Water enhances adsorption in the composites as it allows the dissolution of hydrogen sulfide.
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