Details

Autor(en) / Beteiligte

• Bernardo, M.
• Lapa, N.
• Gonçalves, M.
• Mendes, B.
• Pinto, F.
• Fonseca, I.
• Lopes, H.

Titel

Physico-chemical properties of chars obtained in the co-pyrolysis of waste mixtures

Ist Teil von

• Journal of hazardous materials, 2012-06, Vol.219-220, p.196-202

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• ► Multistep upgrading of chars obtained in the co-pyrolysis of waste mixtures. ► Assessment of their valorisation as precursors of adsorbents. ► Upgrading treatment allowed an efficient decontamination of the pyrolysis chars. ► Chars are meso- and macroporous materials with adsorption capacity to bulky molecules. The present work aims to perform a multistep upgrading of chars obtained in the co-pyrolysis of PE, PP and PS plastic wastes, pine biomass and used tires. The quality of the upgraded chars was evaluated by measuring some of their physico-chemical properties in order to assess their valorisation as adsorbents’ precursors. The crude chars were submitted to a sequential solvent extraction with organic solvents of increasing polarity (hexane, mixture 1:1 v/v hexane:acetone and acetone) followed by an acidic demineralization procedure with 1M HCl solution. The results obtained showed that the upgrading treatment allow the recovery of 63–81% of the pyrolysis oils trapped in the crude chars and a reduction in the char's ash content in the range of 64–86%. The textural and adsorption properties of the upgraded chars were evaluated and the results indicate that the chars are mainly mesoporous and macroporous materials, with adsorption capacities in the range of 3.59–22.2mg/g for the methylene blue dye. The upgrading treatment allowed to obtain carbonaceous materials with quality to be reused as adsorbents or as precursors for activated carbon.