Effects of pH and metal ions on oxytetracycline sorption to maize-straw-derived biochar
Effects of pH and metal ions on oxytetracycline sorption to maize-straw-derived biochar
复制标题
pH和金属离子对玉米秸秆生物炭吸附土霉素的影响
DOI：
10.1016/j.biortech.2013.02.098
复制
发表时间：
2013-05-01
影响因子：
11.4
通讯作者：
Jiang, Xin
中科院分区：
文献类型：
--
作者：
Jia, Mingyun;Wang, Fang;Jiang, Xin
生物质残渣制备的生物炭是疏水性化合物的有效吸附剂，但对生物炭吸附抗生素及其机理的了解仍然不足。通过批量实验研究了玉米秸秆生物炭对土霉素（OTC）的吸附，以及pH和金属离子对其吸附的影响，并利用红外光谱（FTIR）和ζ电位（zeta potential）对其主要吸附机理进行了分析。结果表明，生物炭对OTC的吸附具有高度的ph依赖性。随着pH的增加，OTC的吸附量先增加后降低，在pH为5.5时吸附量最大。在酸性条件下，Cu2+增强了OTC的吸附，而Pb2+略微降低了OTC的吸附。其他金属离子对OTC对生物炭的吸附无显著影响。虽然阳离子交换也可能起作用，但通过π - π相互作用和金属桥接的表面络合作用是最重要的吸附机制。(C) 2013 Elsevier Ltd.版权所有。
Biochars produced from biomass residues have been recognized as effective sorbents to hydrophobic compounds, but knowledge on sorption of antibiotics to biochar and its mechanisms are still inadequate. Sorption of oxytetracycline (OTC) in aqueous solution to maize-straw-derived biochar, and the effect of pH and metal ions, was investigated in batch experiments, and the main sorption mechanisms were elucidated using FTIR and zeta potential measurements. The results showed that sorption of OTC on biochar was highly pH-dependant. The amount of sorbed OTC first increased and then decreased with increasing pH, and maximum sorption was achieved at pH 5.5. Cu2+ enhanced the sorption of OTC, while Pb2+ slightly reduced the sorption under acidic conditions. Other metal ions had no significant effect on the sorption of OTC to biochar. Surface complexation, through pi-pi interaction and metal bridging, was the most important sorption mechanism although cation exchange might have played a role. (C) 2013 Elsevier Ltd. All rights reserved.