Contribution of agro-waste material main components (hemicelluloses, cellulose, and lignin) to the removal of chromium (III) from aqueous solution

BACKGROUND: Agro-waste materials can be used as biosorbents of heavy metals in aqueous solution. However, it is necessary to further study the contribution of agro-waste materials components (i.e. hemicelluloses, cellulose, and lignin) to the heavy metal ions removal from aqueous solution to better...

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Published in:Journal of chemical technology and biotechnology (1986) 2009-10, Vol.84 (10), p.1533-1538
Main Authors: Bernardo, Garcia-Reyes Refugio, Rene, Rangel-Mendez Jose
Format: Article
Language:English
Subjects:
Adsorption
Agave
agro-waste materials
Applied sciences
Biological and medical sciences
Biotechnology
Chemical engineering
chromium (III)
components
Exact sciences and technology
functional groups
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Others
sequential fiber extraction
Sorghum
Various methods and equipments
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Summary:BACKGROUND: Agro-waste materials can be used as biosorbents of heavy metals in aqueous solution. However, it is necessary to further study the contribution of agro-waste materials components (i.e. hemicelluloses, cellulose, and lignin) to the heavy metal ions removal from aqueous solution to better understand the biosorption mechanism, and also based on the biosorbents main components, to predict their potential to remove heavy metals.RESULTS: Cellulose is contained in major proportion (greater than 46%) in the agro-waste materials reported herein compared with hemicelluloses (from 12% to 26%), lignin (varying from 3% to 10%), and other compounds (22% to 30%) that were removed after the neutral detergent fiber procedure. The identified functional groups in agro-waste materials and their fractions included hydroxyl, carboxyl, and nitrogen-containing compounds. Lignin contributed in higher proportion than hemicelluloses to Cr (III) adsorption capacity in both sorghum straw and oats straw. On the other hand lignin was the main fraction responsible for Cr (III) adsorption in agave bagasse.CONCLUSION: Hemicelluloses and lignin were the main contributors to Cr (III) removal from aqueous solution, and cellulose contained in the agro-waste adsorbents studied did not seem to participate. Copyright
ISSN:0268-2575
1097-4660
1097-4660
DOI:10.1002/jctb.2215