Data/hora: 01/06/2024 18:38:21

Provedor de dados: 	NWISRL Publications	
País: 	United Kingdom	
Título: 	Biochars impact on soil moisture storage in an Ultisol and two Aridisols	
Autores: 	Ippolito, J.A.; Strawn, D.G.; Scheckel, K.G.; Novak M, J; Ahmedna, M.; Niandou, M.A.S.	
Data: 	2011	
Ano: 	2011	
Palavras-chave: 	Soil quality.	
Resumo: 	Excessive copper concentrations in water systems can negatively impact biological systems.  Because copper can form strong associations with organic functional groups, we examined the ability of biochar (a carbon-enriched organic bioenergy by-product) to sorb copper from solution.  In a batch experiment, potassium hydroxide-steam activated pecan shell biochar was shaken for 24 hours in pH 6, 7, 8, or 9 buffered solutions containing various copper concentrations to identify effect of pH on biochar copper sorption.  Afterwards, all biochar solids from the 24 hours shaking period were air-dried and then analyzed using X-ray absorption fine structure spectroscopy to determine solid-phase copper speciation.  In a separate batch experiment, biochar was shaken for 30 days in pH 6 buffered solution containing increasing copper concentrations; the copper sorption maximum was calculated based on the exponential rise to a maximum equation.  Biochar sorbed increasing amounts of copper as the solution pH decreased from 9 to 6.  The X-ray absorption fine structure results revealed that copper was predominantly sorbed onto a biochar organic phase at pH 6 in a molecular structure similar to copper adsorbed on humic acid.  The X-ray absorption fine structure spectra at pH 7, 8, and 9 suggested that copper was associated with the biochar as three phases: 1) a complex adsorbed on organic ligands similar to copper on humic acid; 2) carbonate phases similar to azurite; and 3) a copper oxide phase like tenorite.  The exponential rise equation fit to the incubated samples predicted a copper sorption maximum of 42,300 mg/kg copper.  The results showed that potassium hydroxide-steam activated pecan shell biochar could be utilized as a material for sorbing excess copper from water systems, potentially reducing the negative effects of copper in the environment.	
Tipo: 	Article	
Identificador: 	http://eprints.nwisrl.ars.usda.gov/1521/1/1483.pdf

Ippolito, J.A. and Strawn, D.G. and Scheckel, K.G. and Novak M, J and Ahmedna, M. and Niandou, M.A.S. (2011) Biochars impact on soil moisture storage in an Ultisol and two Aridisols. Journal of Environmental Quality. 35(6):2333-2341.	
Relação: 	http://eprints.nwisrl.ars.usda.gov/1521/	
Formato: 	application/pdf