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Characterization of activated carbon produced from coffee residues by chemical and physical activation
KTH, School of Chemical Science and Engineering (CHE).
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Karakterisering av aktivt kol producerat från kaffesump genom kemisk och fysikalisk aktivering (Swedish)
Abstract [en]

Activated carbons are one of the most used adsorbents with lots of applications in many sectors. Activated carbons can be produced from lignocellulosic materials with a large content of carbon. Coffee is the second trade most consumed all over the world; hence their residues can be treated in order to give a value.

In order to evaluate the viability of using coffee residues as precursor have been carried out experiments by chemical and physical activation. The chosen chemical was phosphoric acid, a dehydrating chemical widely used in production of activated carbons while steam was selected for a physical activation.

In this study have been studied the temperature activation and the concentration of chemical as the main factors. One of the advantages of using a chemical is the lower activation temperature; in this study were selected 500ºC, 600ºC and 700ºC while samples treated by steam were 600ºC, 700ºC and 800ºC. Water is a reactive agent that removes volatile compounds and makes wide pores whereas chemicals create linkages with the carbon and volatile compounds enhancing their porosity. Hence, have been studied the following impregnation concentrations 30%, 40% and 50% in order to evaluate their properties as adsorbents.

Isotherms were analysed to determine their surface area and pore size distribution. Also were determined the pore size and pore volume for all samples.

Place, publisher, year, edition, pages
2011. , 60 p.
Keyword [en]
activated carbon, coffee residues, chemical acivation, physical activation, surface characteristics
Identifiers
URN: urn:nbn:se:kth:diva-32872OAI: oai:DiVA.org:kth-32872DiVA: diva2:414291
Subject / course
Chemical Engineering
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2011-05-03 Created: 2011-04-26 Last updated: 2011-05-27

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