九龙江沉积物主要组分对四环素类抗生素吸附性能对比

发布时间：2018-11-11 17:43

【摘要】：沉积物作为一种重要的水体环境介质,因其复杂的组成结构和时空差异性而具有巨大的研究前景,抗生素滥用引起的环境污染同样引起了广泛关注。四环素类抗生素(TCs)形态结构复杂,能够以多种方式被沉积物吸附。为了更深入地了解四环素类抗生素在河流中的迁移转化规律,以四环素和土霉素作为研究对象,采用选择性萃取方法分离出九龙江沉积物中起主要吸附作用的组分(铁氧化物、锰氧化物、有机质)并获得各组分的含量,运用等温平衡吸附法在TCs与沉积物质量比为0.01~0.06范围内进行吸附试验,利用Langmuir和Freundlich吸附等温方程拟合吸附过程并进行统计分析,从而研究各组分对TCs的吸附特征、能力和吸附贡献量。结果表明,沉积物及其主要组分对TCs的吸附过程特征符合Langmuir吸附等温方程,相关系数达0.95以上;沉积物中各组分对TCs的吸附能力大小顺序为锰氧化物有机质铁氧化物残渣态;各组分对TCs的绝对吸附贡献量大小顺序为锰氧化物残渣态铁氧化物有机质。其中,锰氧化物在沉积物中所占比例较小,只有0.05%,却对TCs的吸附贡献率最大(56%),所采集的九龙江典型沉积物对TCs的吸附起最主要和关键作用的组分是锰氧化物。不同地理位点的沉积物理化性质差异很大,对TCs的吸附能力与锰氧化物含量有一定的相关性,这验证了前述结论。
[Abstract]:As an important water environment medium, sediment has a great research prospect because of its complex composition structure and space-time difference. The environmental pollution caused by the abuse of antibiotics has also attracted extensive attention. Tetracycline antibiotics (TCs) are complex in morphology and can be adsorbed by sediments in many ways. In order to understand the migration and transformation of tetracycline antibiotics in rivers, tetracycline and oxytetracycline were used as research objects. Manganese oxide, organic matter) and the content of each component were obtained. The adsorption experiments were carried out in the range of 0.01g / 0.06 mass ratio of TCs to sediment by isothermal equilibrium adsorption method. The adsorption isotherm equations of Langmuir and Freundlich were used to fit the adsorption process and the statistical analysis was carried out to study the adsorption characteristics, ability and adsorption contribution of each component to TCs. The results show that the adsorption process of TCs by sediment and its main components accords with the isotherm equation of Langmuir adsorption, and the correlation coefficient is more than 0.95. The order of adsorption ability of each component to TCs is manganese oxide organic matter iron oxide residue, and the absolute adsorption contribution of each component to TCs is manganese oxide residual iron oxide organic matter. Among them, the proportion of manganese oxide in sediment is small, only 0.05%, but the contribution to TCs is the largest (56%). Manganese oxide is the most important and key component of TCs adsorption in the typical sediment of Jiulong River. The physical and chemical properties of sediments at different geographical sites are very different, and the adsorption ability of TCs is related to the content of manganese oxide, which verifies the above conclusions.
【作者单位】：东华大学环境科学与工程学院;中国科学院城市环境研究所;国家环境保护纺织工业污染防治工程技术中心;
【基金】：国家自然科学面上基金项目(21277138);国家自然科学面上基金项目(21377203) 东华大学中央高校基本科研业务费专项资金项目(2232014D3-17) 国家国际科技合作专项项目(2001DFB91710)
【分类号】：X522

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