Activated carbon derived from waste coffee grounds for stable methane storage.
An activated carbon material derived from waste coffee grounds is shown to be an effective and stable medium for methane storage. The sample activated at 900 °C displays a surface area of 1040.3 m(2) g(-1) and a micropore volume of 0.574 cm(3) g(-1) and exhibits a stable CH4 adsorption capacity of ∼4.2 mmol g(-1) at 3.0 MPa and a temperature range of 298 ± 10 K. The same material exhibits an impressive hydrogen storage capacity of 1.75 wt% as well at 77 K and 100 kPa. Here, we also propose a mechanism for the formation of activated carbon from spent coffee grounds. At low temperatures, the material has two distinct types with low and high surface areas; however, activation at elevated temperatures drives off the low surface area carbon, leaving behind the porous high surface area activated carbon.
Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 689-798, Korea. NASA Ames Research Center, Moffett Field, CA 94035, USA.
K Christian
KC
Kemp
Seung Bin
SB
Baek
Wang-Geun
WG
Lee
M
M
Meyyappan
Kwang S
KS
Kim
D002244:Carbon; D002606:Charcoal / Q000737:chemistry*; D003069:Coffee; D006859:Hydrogen / Q000737:chemistry; D008697:Methane / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014866:Waste Products
D003069:Coffee; D014866:Waste Products; D002606:Charcoal; D002244:Carbon; D006859:Hydrogen; D008697:Methane