水环境中氧化石墨烯的转化和降解及其对有机污染物迁移归趋的影响

氧化石墨烯（GO）进入水体环境中，能够在水体中稳定悬浮并迁移一定的时间，在化学物质及光照的影响下，GO会发生转化和降解，且其聚合状态及表面性质也会发生相应的变化，这些变化将直接影响GO的环境归趋以及GO与有机污染物之间的相互作用，对该过程的研究是确定其环境效应，并在此基础上进行生命周期评价的重要环节。本研究拟针对氧化/还原性物质、光照等环境条件作用下，悬浮态GO在转化和降解过程中的微观形态、表面性质和聚合状态等进行综合研究，分析转化和降解机理；同时，考察水体中共存阳离子和溶解有机质（DOM）对GO转化和降解行为的影响机制；在此基础上，以憎水性污染物和抗生素作为模型化合物，考察GO的转化和降解对有机污染物吸附行为的影响规律，阐明GO与有机污染物的吸附机理。本研究将为GO和有机污染物的环境行为预测和风险评估建立基础数据储备。

Upon exposure in aquatic environment, graphene oxide (GO) could be suspended and transported in water columns for some time, where transformation and degradation processes mediated by chemicals and sunlight would become important. And the surface properties and dispersion/composition of GO are altered during transformation and degradation, and will directly affect the fates and adsorption behavior with organic pollutants of GO. Therefore, the research of the transformation and degradation processes of GO in the environment is the key link for the determination of the environmental capacity and for the evaluation of the life cycle of GO sheets in the environment. This work is proposed to systematically study the microscopic morphology, surface properties and aggregation properties of GO during transformation and degradation in aqueous environment, under the influence of oxidizing/reducing substances and light, and the mechanisms of transformation and degradation of GO will be investigated. Additionally, the effect of coexisting cations and dissolved organic matter (DOM) to transformation and degradation of GO will also be studied. Hydrophobic organics and antibiotics will be used as model compounds to investigate the effect of transformation and degradation of GO on adsorption behavior, and the adsorption mechanism between GO and organic pollutants. This work will establish a fundamental and useful database for environmental behavior prediction and risk assessment of GO and organic pollutants.