期刊
WATER RESEARCH
卷 48, 期 -, 页码 396-405出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.09.050
关键词
Biochar; Amino modification; Copper ions; Wastewater; Adsorption
资金
- National 863 Program [2012AA063608-01]
- National Key Technology R&D Program of the Ministry of Science and Technology [2012BAJ08B00]
- Key Special Program on the S&T for the Pollution Control and Treatment of Water Bodies [2012ZX07103-001]
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. (C) 2013 Elsevier Ltd. All rights reserved.
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