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二氧化锰改性碳纳米管对四环素和泰乐菌素的吸附

DOI: 10.11654/jaes.2015.04.025

Keywords: 碳纳米管 二氧化锰 四环素 泰乐菌素 吸附

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Abstract:

采用氧化还原法制备二氧化锰负载碳纳米管(MnO2/MWNT),通过批次吸附实验研究其对所选四环素和泰乐菌素的吸附行为及其影响因素。研究结果表明:与未处理的碳纳米管相比,二氧化锰负载后显著提高了碳纳米管对四环素和泰乐菌素的吸附,约提高了5~8倍;两种抗生素在MnO2/MWNT上的强吸附机制可解释为π-π电子交互作用、阳离子-π键作用和路易斯酸碱对作用;随着pH升高,四环素和泰乐菌素在MnO2/MWNT上的吸附显著降低,两种抗生素所含官能团的去质子化作用,以及MnO2/MWNT表面含氧官能团的解离,导致MnO2/MWNT与两种抗生素之间的吸附作用减弱。可溶性腐植酸降低了泰乐菌素在MnO2/MWNT上的吸附,而对四环素影响很小,主要原因是大分子腐植酸不能有效地与四环素竞争MnO2/MWNT孔道内部的吸附位点

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