富勒烯C60在湖泊水体中的稳定性及对沉积物吸附多环芳烃的影响机制

Nowadays, fullerene C60 is a kind of widely used nanomaterial and is readily enter water, soil and other environmental media due to unreasonable use. It causes harm to ecology environment and public health. Water-sediment systems are important sinks for C60 in environment. The environmental behavior of C60 in water is closely related to its stability. However, the stability mechanism of C60 in natural water requires a clear understanding. At the same time, the impacts of C60 on coexisting pollutants in environment have been investigated mostly in water and soil bodies, whereas the impacts of C60 on adsorption characteristics and biological effectiveness of coexisting pollutants in sediments are limited. This project intends to choose lakes with different degrees of eutrophication as the research targets, (1) investigating the influencing rule of natural lake water on stability characteristics of C60,(2) finding out the effects of C60 on surface morphology and chemical characteristics of sediments, (3) basing on result from (2),systematically analyzing the impact mechanisms of C60 on adsorption properties and bioavailability of coexisting pollutants in sediments by selecting typical polycyclic aromatic hydrocarbons——phenanthrene and pyrene as the model pollutants. The study will provide scientific and theoretical bases for assessing the environmental risk of C60 in natural water-sediment systems.

富勒烯（C60）是目前广泛应用的纳米材料，但不合理的应用导致其进入水体、土壤等环境介质中，对生态环境和人类健康构成严重威胁。水体-沉积物是C60在环境中重要的汇，C60在水体中的环境行为与其稳定性密切相关。然而，C60在自然水体中的稳定机制尚需明确。此外，C60对环境中共存污染物影响的研究目前集中于水体和土壤，而关于C60对沉积物中共存污染物的吸附特性和生物有效性影响的研究亦很缺乏。本项目拟以我国典型的不同富营养化程度的湖泊水体-沉积物为对象：（1）分析自然湖泊水体条件下C60的稳定机制；（2）分析C60对沉积物微观表面形态和化学特性的影响规律；（3）在（2）的基础上，选择典型多环芳烃——菲和芘为模式污染物，探究C60对沉积物中共存污染物的吸附规律和污染物生物有效性的影响机制。本研究可为评估C60在湖泊水体-沉积物中的环境风险提供科学依据和理论支持。

富勒烯（C60）是目前广泛应用的纳米材料，但不合理的应用导致其进入水体、土壤等环境介质中，对生态环境和人类健康构成严重威胁。水体-沉积物是C60在环境中重要的汇，C60在水体中的环境行为与其稳定性密切相关。然而，C60在自然水体中的稳定机制尚需明确。此外，C60对环境中共存污染物影响的研究目前集中于水体和土壤，而关于C60对沉积物中共存污染物的吸附特性的研究亦很缺乏。本项目1)通过野外采集不同自然水体，实验室内制备C60纳米颗粒分散液，通过动态光散射研究了不同自然水体对C60纳米颗粒团聚特性及表面Zeta电位的影响。以及对C60纳米颗粒沉降行为的影响。揭示了不同自然水体中，C60纳米颗粒的稳定性差异及其影响机制。2)采用SEM, BET和FTIR等仪器分析法揭示了C60纳米颗粒对沉积物表面微观表面形态及化学特性的影响与机理。3)通过吸附动力学、等温模型和吸附热力学研究,揭示了C60纳米颗粒对沉积物吸附典型有机污染物阿特拉津的影响及其机理。4)采用过硫酸盐高级氧化技术降解土壤中阿特拉津并揭示了其降解机制。本研究可为评估C60在湖泊水体-沉积物中的环境风险提供科学依据和理论支持。