Activated carbon derived from waste coffee grounds for stable methane storage. (25th September 2015)

• Record Type: Journal Article
• Authors: Kemp, K Christian; Baek, Seung Bin; Lee, Wang-Geun; Meyyappan, M; Kim, Kwang S
• Is Part Of: Nanotechnology. Volume 26:Number 38(2015)
• Page Start: 225
• Publication Date: 2015-09-25
• Subjects: Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/26/38/385602
• Languages: English
• ISSNs: 0957-4484

Abstract

<abstract> <title>Abstract</title> <p>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 m² g⁻¹ and a micropore volume of 0.574 cm³ 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.</p> </abstract>