针铁矿/有机质界面过程对典型抗生素吸附和光解的影响机制

项目名称： 针铁矿/有机质界面过程对典型抗生素吸附和光解的影响机制

项目编号： No.41503095

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 郭学涛

作者单位： 西北农林科技大学

项目金额： 21万元

中文摘要： 鉴于抗生素进入环境后会给人类健康和生态环境带来一系列的危害，开展其在环境中迁移转化的研究是评价抗生素生态环境风险的基础。以往的研究主要集中在抗生素在土壤及其单一组分和界面作用下的吸附和光解，而对多介质多界面作用下抗生素吸附和光解的特性和机制仍不明了。因此，本项目以大环内酯和磺胺类药物为研究对象，以针铁矿和有机质这两类环境地球化学过程活跃的物质为基础，以“界面特性—吸附特性—光解特性”为研究主线，系统研究不同形态有机质（腐殖酸、干酪根和碳黑）与针铁矿之间的微观界面作用特性和机制，考察抗生素在不同有机质及其与针铁矿复合体上的吸附/解吸特性和机制，明确针铁矿与不同有机质复合体对抗生素的光解特性和机理，探讨多介质多界面作用下抗生素的吸附和光解特性及土壤活性物质之间的界面过程与抗生素吸附光解的内在联系。本项目的研究有助于正确评估抗生素的潜在环境风险，为保障人体健康和生态环境安全提供科学依据。

中文关键词： 针铁矿；有机质；抗生素；吸附；光解

英文摘要： Antibiotics are excreted into the aquatic and terrestrial environmental in the parent form or its metabolite forms along with urine and feces, which will induce negative effect on aquatic and terrestrial organisms and human health. Therefore, it is critical to reveal the migration and transformation mechanisms for the risk assessment of antibiotics in the ecological environment. Previous studies mainly focused on the sorption and photolysis of antibiotics in various soils or in a single component and interface of soils. However, the effects of multiple medium interfaces on the sorption and photolysis features and mechanism of antibioltics are still unclear. To explore the effects of the interface process on the sorption and photolysis of antibiotics in the environmental, the macrolides and sulfonamides antibiotics are chosen as the sorbates. The goethite and organic matters as two actives of the environmental geochemistry are the foundation. The blue map of this work is the “interface process - sorption features - photolysis characteristics”. Firstly, the interfacial interaction features and mechanisms between the organic matter (i.e., humic acid, kerogen and black carbon) and goethite will be investigated. Furthermore, the sorption/desorption characteristics and mechanisms are studied in each organic matter and its complexes with goethite. Then the photolysis behaviors of antibiotics in the complexs were investigated. Finally, the effects of interaction and interface process of multimedium and multi-interface on the sorption and photolysis of antibiotics are explored. Base on these results, we will assess the environmental risk of antibiotics and then provide suggestions for environmental management of antibiotics.

英文关键词： goethite;organic matters;antibiotics ;sorption;photolysis