title: Amino modification of biochar for enhanced adsorption of copper ions from synthetic wastewater.
abstract: 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.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Guang-Xi
authors.initials: GX
authors.lastname: Yang
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D002606:Charcoal; D003300:Copper / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C540010:biochar; D002606:Charcoal; D003300:Copper
keywords: Adsorption; Amino modification; Biochar; Copper ions; Wastewater