自然水体多种固相物质的共存对其吸附林丹和环丙沙星的影响

发布时间：2018-03-21 09:52

本文选题：多固相共存　切入点：生物膜　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：自然水体是一个复杂的多相共存体系。生物膜、悬浮颗粒物和表层沉积物等固相物质是自然水体的重要组成部分,它们参与了自然水体中污染物的迁移转化过程,并在很大程度上决定水体污染物的归趋。由于污染物在水-固界面的吸附过程通常是影响污染物后续环境行为的决定性步骤,长期以来受到了研究人员的广泛关注。而已有研究多关注污染物或共存污染物在单一固相水相体系中的吸附作用,鲜有关注水中多种固相物质间的相互作用对它们吸附各种污染物的影响的研究。共存于同一自然水体中的生物膜、悬浮颗粒物和沉积物能够进行物质交换,通常对各自的组分及结构造成影响甚至实现相互转化。固相物质间的相互作用必然会影响到水中污染物的环境行为。因此,开展固相物质间的相互作用及其对水中污染物环境行为的影响研究有助于深入认识污染物在真实水环境中的迁移转化行为。本文选择在水环境中广泛被检出且受到人们广泛关注的两种有机污染物:典型有机氯农药——林丹和喹诺酮类抗生素——环丙沙星作为目标物。通过构建生物膜、悬浮颗粒物和表层沉积物三种固相物质的不同组合体系,进行不同体系的等温吸附实验,分析了不同体系中林丹和环丙沙星吸附特征的差异;通过荧光光谱等分析手段,分析了固相物质组分在多固相共存体系中的变化,初步探讨了固相物质间的相互作用对它们吸附有机污染物的影响作用机制。结果表明,单固相体系中固相物质对林丹的吸附能力大小顺序为:生物膜悬浮颗粒物表层沉积物;等质量双固相体系中固相组合对林丹的吸附能力最强的为生物膜和悬浮颗粒物的组合,其次为生物膜和表层沉积物的组合,表层沉积物和悬浮颗粒物的组合吸附能力最弱。单固相体系对环丙沙星的吸附能力与其吸附林丹的能力强弱顺序相同;等质量双固相体系中固相组合对环丙沙星的吸附能力最强的组合为生物膜和表层沉积物,其次为生物膜和悬浮颗粒物的组合,吸附能力最弱的为表层沉积物和悬浮颗粒物的组合。在固相物质质量相同的情况下,共存体系对林丹的吸附能力与其体系中溶解性有机质(Dissolved Organic Matter,DOM)的含量大小一致。等质量双固相体系中生物膜、悬浮颗粒物和表层沉积物对林丹的吸附贡献分别为:45.4%,35.7%和18.9%;它们对环丙沙星的吸附贡献分别为:44.6%,27.2%和28.3%。共存的固相物质吸附林丹和环丙沙星时,不同固相物质之间存在相互抑制作用,且DOM含量差距较大的共存体系对其吸附林丹和环丙沙星的抑制能力更强。在多固相共存体系中,固相物质DOM中的类胡敏酸组分变化较大,DOM中的类胡敏酸等组分在共存体系中的重新分配导致了多固相吸附体系与单固相吸附体系中有机污染物吸附特征的差异。
[Abstract]:Natural water is a complex multiphase coexistence system. Solid matter such as biofilm, suspended particulate matter and surface sediment are important components of natural water body, which participate in the process of pollutant migration and transformation in natural water. The adsorption process of pollutants at the water-solid interface is usually the decisive step to influence the subsequent environmental behavior of pollutants. For a long time, researchers have paid much attention to the adsorption of pollutants or co-existing pollutants in a single solid-phase aqueous system. Little attention has been paid to the effects of interactions between solid substances in water on their adsorption of pollutants. Biofilms coexisting in the same natural water, suspended particulates and sediments can exchange matter, It usually affects and even transforms each other's composition and structure. The interaction between solid matter will inevitably affect the environmental behavior of pollutants in water. The research on the interaction between solid matter and its influence on the environmental behavior of pollutants in water is helpful to understand the migration and transformation behavior of pollutants in real water environment. To two organic pollutants of widespread concern: Lin Dan, a typical organochlorine pesticide, and ciprofloxacin, a quinolone antibiotic, as a target. The isothermal adsorption experiments of three kinds of solid materials, suspended particulate matter and surface sediment, were carried out, and the differences of adsorption characteristics between Lin Dan and ciprofloxacin in different systems were analyzed. The changes of the composition of solid matter in the system of multi-solid phase coexistence were analyzed, and the mechanism of the interaction of solid matter on the adsorption of organic pollutants was discussed. The order of adsorption ability of solid matter to Lin Dan in single solid phase system is as follows: surface sediment of suspended particulate matter in biofilm, and the combination of biofilm and suspended particle in the combination of solid phase and suspended particle in two-solid phase system of equal mass. Secondly, the combination of biofilm and surface sediment, the combination of surface sediment and suspended particulates was the weakest. The adsorption ability of single solid phase system to ciprofloxacin was the same as that of Lin Dan. The combination of biofilm and surface sediment was the most powerful combination of solid phase combination to ciprofloxacin, followed by biofilm and suspended particulates. The weakest adsorption capacity is the combination of surface sediment and suspended particulate matter. When the mass of solid matter is the same, The adsorption ability of the coexistence system to Lin Dan was consistent with the content of dissolved organic matter (Organic matter) in the system. The contribution of suspended particulates and surface sediments to Lin Dan adsorption was 35.7% and 18.9%, respectively, and their adsorption contribution to ciprofloxacin was 27.2% and 28.30.When they were adsorbed by the existing solid phase substances, respectively, the adsorptive contribution to ciprofloxacin was 27.2% and 28.30.When the coexisting solid phase substance adsorbed Lin Dan and ciprofloxacin, There were mutual inhibition among different solid phase substances, and the adsorption ability of Lin Dan and ciprofloxacin was stronger in the coexistence system with large difference in DOM content. In the system of multi-solid phase coexistence, the absorption of Lin Dan and ciprofloxacin was stronger than that of the co-existing system. The repartition of Hu Min-like acids in the solid phase DOM led to the difference of the adsorption characteristics between the multi-solid-phase adsorption system and the single-solid-phase adsorption system.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X52

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