Abstract

The present work aims to perform an upgrading study of chars obtained in the co-pyrolysis of 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 possible routes of valorisation. The crude chars were submitted to a sequential solvent extraction with organic solvents of increasing polarity followed by an acidic demineralization procedure with 1 M HCl solution. The results obtained showed that the upgrading treatment has recovered 63-81% of the pyrolysis tars trapped in the crude chars and reduced the char's ash content in the range of 64-86%. The demineralization procedure also allowed concluding that the main heavy metals as well as the most hazardous ones are significantly immobilized in the char's matrix if aggressive acidic conditions are not used. 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 3.59-22.2 mg/g for the methylene blue dye. The upgrading treatment allowed obtaining carbonaceous materials with quality to be reused as adsorbents or as precursors for activated carbon.
Original languageEnglish
Title of host publicationWasteEng
Pages496-501
Number of pages6
Publication statusPublished - 1 Jan 2012
Event4th International Conference on Engineering for Waste and Biomass Valorisation, September 10-13, Porto, Portugal -
Duration: 1 Jan 2012 → …

Conference

Conference4th International Conference on Engineering for Waste and Biomass Valorisation, September 10-13, Porto, Portugal
Period1/01/12 → …

Keywords

  • adsorption properties
  • textural properties
  • pyrolysis chars
  • demineralization

Fingerprint

Dive into the research topics of 'Characterization and potential applications of chars from the pyrolysis of polymeric residues'. Together they form a unique fingerprint.

Cite this