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Carbon Adsorbents from Spent Coffee for Removal of Methylene Blue and Methyl Orange from Water.
- Source :
-
Materials (Basel, Switzerland) [Materials (Basel)] 2021 Jul 16; Vol. 14 (14). Date of Electronic Publication: 2021 Jul 16. - Publication Year :
- 2021
-
Abstract
- Activated carbons (ACs) were prepared from dried spent coffee (SCD), a biological waste product, to produce adsorbents for methylene blue (MB) and methyl orange (MO) from aqueous solution. Pre-pyrolysis activation of SCD was achieved via treatment of the SCD with aqueous sodium hydroxide solutions at 90 °C. Pyrolysis of the pretreated SCD at 500 °C for 1 h produced powders with typical characteristics of AC suitable and effective for dye adsorption. As an alternative to the rather harsh base treatment, calcium carbonate powder, a very common and abundant resource, was also studied as an activator. Mixtures of SCD and CaCO <subscript>3</subscript> (1:1 w / w ) yielded effective ACs for MO and MB removal upon pyrolysis needing only small amounts of AC to clear the solutions. A selectivity of the adsorption process toward anionic (MO) or cationic (MB) dyes was not observed.
Details
- Language :
- English
- ISSN :
- 1996-1944
- Volume :
- 14
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Materials (Basel, Switzerland)
- Publication Type :
- Academic Journal
- Accession number :
- 34300916
- Full Text :
- https://doi.org/10.3390/ma14143996