Amino modification of biochar for enhanced adsorption of copper ions from synthetic wastewater.
Amino modification of biochar for enhanced adsorption of copper ions from synthetic wastewater.
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DOI：
10.1016/j.watres.2013.09.050
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发表时间：
2014
期刊：
影响因子：
12.8
通讯作者：
Guangxing Yang;Hong Jiang
中科院分区：
文献类型：
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作者：
Guangxing Yang;Hong Jiang
采用硝化还原法对生物炭进行改性，使其成为一种高效、选择性的铜离子吸附剂。X射线光电子能谱（XPS）和衰减全反射-傅里叶变换红外光谱（ATR-FTIR）分析结果表明，氨基与生物炭表面的官能团发生了化学键合。研究了固定床吸附Cu（II）的动力学、热力学及吸附和解吸过程。结果表明，氨基改性生物炭对Cu（II）具有良好的吸附性能。改性生物炭的吸附容量和床体积分别是未改性生物炭的5倍和8倍. XPS和ATR-FTIR分析表明，吸附前后Cu（II）与氨基发生了强烈的络合作用，使其具有较高的pH稳定性和离子选择性。
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.