Chen Yue, Shi Jing, Du Qiong, Zhang Haowen, Cui Yixin
School of Engineering, China Pharmaceutical University Nanjing 211198 People's Republic of China
Department of Civil Engineering, McMaster University Hamilton L8S 4L7 Canada.
RSC Adv. 2019 May 7;9(25):14143-14153. doi: 10.1039/c9ra01271k.
Pollution by antibiotics has become a serious threat to public health. In this study, agricultural waste, corn husk, in the form of biochar, was utilized for antibiotic removal from wastewater. Two kinds of iron-loaded biochars, impregnation-pyrolysis biochar (IP) and pyrolysis-impregnation biochar (PI), were synthesized to adsorb the typical antibiotics tetracycline (TC) and levofloxacin (LEV). PI contained amorphous hydrated iron oxide, whereas the major component of IP was γ-FeO. Compared with IP, PI had a much higher adsorption capacity for both TC and LEV. This was because PI could provide more -OH, especially -OH, to serve as the adsorption sites. In comparison with TC, -OH was prone to combine with LEV. FT-IR and XPS results indicated that the mechanisms of LEV adsorption included hydrogen bonding, F-replacement, electrostatic attraction and bridging bidentate complexation. TC adsorption may involve complexation, hydrogen bonding and electrostatic attraction.
抗生素污染已成为对公众健康的严重威胁。在本研究中，以生物炭形式存在的农业废弃物玉米秸秆被用于去除废水中的抗生素。合成了两种负载铁的生物炭，即浸渍热解生物炭（IP）和热解浸渍生物炭（PI），以吸附典型抗生素四环素（TC）和左氧氟沙星（LEV）。PI含有无定形水合氧化铁，而IP的主要成分是γ-FeO。与IP相比，PI对TC和LEV都具有更高的吸附容量。这是因为PI可以提供更多的-OH，尤其是-OH，作为吸附位点。与TC相比，-OH更容易与LEV结合。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）结果表明，LEV的吸附机制包括氢键、F取代、静电吸引和桥联双齿络合。TC的吸附可能涉及络合、氢键和静电吸引。
