Chars from co-gasification of rice wastes as Cr(III) removal agents

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Rice husk (80% w/w) and polyethylene (20% w/w) were submitted for cogasification. The resulting char (GC) was characterized and used in Cr(III) liquid-phase removal assays. A Commercial Activated Carbon (CAC) was also used for comparison purposes. GC was mainly composed of ashes (68.3% w/w), with Si being the major mineral element and K the most soluble one. GC presented an alkaline character, which was responsible for an ecotoxic level in the char. In the Cr(III) removal assays, three Solid/Liquid ratios (S/L) were used: 2.5, 5.0 and 10.0 g L−1. Generally, GC performed better than CAC: in the S/L of 10.0 g L–1, GC removed 98.9% of Cr(III) (mainly by precipitation), while in the S/L of 5.0 g L–1, GC removed 42.3% of Cr(III) by adsorption. The ionic exchanges of K+ from GC and Cr(III) in the liquid medium were the predominant removal mechanism.

Original languageEnglish
Title of host publicationWASTES - Solutions, Treatments and Opportunities II - Selected papers from the 4th edition of the International Conference Wastes
Subtitle of host publicationSolutions, Treatments and Opportunities, 2017
EditorsMaria de Lurdes Lopes, Cândida Vilarinho, Fernando Castro
Place of PublicationLondon
PublisherCRC Press/Balkema
Pages75-80
Number of pages6
ISBN (Electronic)9781315206172
ISBN (Print)9781138196698
DOIs
Publication statusPublished - 1 Jan 2018
Event4th International Conference Wastes: Solutions, Treatments and Opportunities, WASTES 2017 - Porto, Portugal
Duration: 25 Sep 201726 Sep 2017

Conference

Conference4th International Conference Wastes: Solutions, Treatments and Opportunities, WASTES 2017
CountryPortugal
CityPorto
Period25/09/1726/09/17

Keywords

  • Activated carbon
  • Ion exchange
  • Wastes

Fingerprint Dive into the research topics of 'Chars from co-gasification of rice wastes as Cr(III) removal agents'. Together they form a unique fingerprint.

  • Cite this

    Dias, D., Ribeiro, W., Lapa, N., Bernardo, M., Matos, I., Fonseca, I., & Pinto, F. (2018). Chars from co-gasification of rice wastes as Cr(III) removal agents. In M. de Lurdes Lopes, C. Vilarinho, & F. Castro (Eds.), WASTES - Solutions, Treatments and Opportunities II - Selected papers from the 4th edition of the International Conference Wastes: Solutions, Treatments and Opportunities, 2017 (pp. 75-80). London: CRC Press/Balkema. https://doi.org/10.1201/9781315206172-13