Influence of feedstock on the copper removal capacity of waste-derived biochars

[Display omitted] •The physicochemical properties of biochars determine their binding capacity.•Better adsorption capacities are found when O/C, ash and P content are larger.•The main adsorption mechanisms are surface adsorption and surface precipitation.•Copper distribution between solid and soluti...

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Bibliographic Details
Published in:Bioresource technology 2016-07, Vol.212, p.199-206
Main Authors: Arán, Diego, Antelo, Juan, Fiol, Sarah, Macías, Felipe
Format: Article
Language:English
Subjects:
Acacia
Adsorption
Animals
Biochar
Charcoal - chemistry
Chickens
Copper
Copper - analysis
Copper - chemistry
Eucalyptus
Hydrogen-Ion Concentration
Manure
Olea
Oryza
Slow pyrolysis
Waste Management - methods
Zea mays
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Summary:[Display omitted] •The physicochemical properties of biochars determine their binding capacity.•Better adsorption capacities are found when O/C, ash and P content are larger.•The main adsorption mechanisms are surface adsorption and surface precipitation.•Copper distribution between solid and solution phases depends on the nature of the BC.•Copper adsorption capacity increases with the pH of the aqueous solution. Biochar samples were generated by low temperature pyrolysis of different types of waste. The physicochemical characteristics of the different types of biochar affected the copper retention capacity, by determining the main mechanism involved. The capacity of the biochar to retain copper present in solution depended on the size of the inorganic fraction and varied in the following order: rice biochar>chicken manure biochar>olive mill waste biochar>acacia biochar>eucalyptus biochar>corn cob biochar. The distribution of copper between the forms bound to solid biochar, dissolved organic matter and free organic matter in solution also depended on the starting material. However, the effect of pH on the adsorption capacity was independent of the nature of the starting material, and the copper retention of all types of biochar increased with pH.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.04.043