Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Amino modification of biochar for enhanced adsorption of copper ions from synthetic wastewater
Ist Teil von
Water research (Oxford), 2014-01, Vol.48, p.396-405
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2014
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
Biochar was modified as a high efficient and selective absorbent for copper ions (Cu(II)) by nitration and reduction. Results of X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) analyses indicated that the amino groups were chemically bound to the functional groups on the biochar surface. Kinetics, thermal dynamics, and adsorption and desorption of Cu(II) in fixed-bed were investigated. The results demonstrated that the amino-modified biochar exhibited excellent adsorption performance for Cu(II). The adsorption capacity and bed volume of the modified biochar are five- and eight- folds of the pristine biochar, respectively. The Cu(II) combined with the amino groups through strong complexation based on the comparison of XPS and ATR-FTIR analyses before and after adsorption, which endows it with the high pH stability and ion selectivity.
[Display omitted]
•We proposed an innovative method to modify the biochar with amino groups.•The amino groups were anchored onto the biochar surface by chemical bonding.•Electrophilic aromatic substitution and nitro reduction reactions are involved.•The high adsorption capacity for Cu2+ is ascribed to the complexation.