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Influence of pig manure biochar mineral content on Cr( III ) sorption capacity
Author(s) -
Wnetrzak Renata,
Leahy J.J.,
Chojnacka Katarzyna W.,
Saeid Agnieszka,
Novotny Etelvino,
Jensen Lars Stoumann,
Kwapinski Witold
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4159
Subject(s) - sorption , biochar , sorbent , chemistry , manure , adsorption , cation exchange capacity , pyrolysis , chicken manure , ion exchange , raw material , nuclear chemistry , environmental chemistry , ion , soil water , agronomy , organic chemistry , environmental science , soil science , biology
BACKGROUND The adsorption of Cr( III ) ions on various pig manure biochar ( BC ) samples was investigated to determine the effect of operating conditions (initial pH , sorbate and sorbent concentrations) on sorptive capacity. The BC samples with higher sorption capacity showed high surface area and were rich in alkaline metals whose concentration was measured by ICP‐OES . RESULTS For BCs from anaerobically and chemically pretreated feedstock greater Δ pH changes and higher maximum capacity were noted during Cr( III ) adsorption than for BC from mechanically pretreated samples, due to a higher ion exchange capacity. The maximum Cr( III ) uptake of 102 mg g ‐1 for the BC sample was achieved at c 0 = 300 mg dm ‐3 and pH = 5. It was also observed that the high ash content effectively lowered the surface area of BCs ; however all BCs investigated contained a low level of toxic metals . CONCLUSIONS The data indicate that both the technology used for separation of the manure and pyrolysis temperature had a significant influence on the physical and chemical properties of the BC and affected its sorption capacity. In addition, compared with other sorbents pig manure BC has one of the best Cr( III ) sorption capacities. © 2013 Society of Chemical Industry