报告题目：Environmental Implications and Applications of Carbon Nanomaterials in Water Treatment.

报告 人：So-Ryong Chae 博士

　　　　 School of Chemical and Biomolecular Engineering University of Sydney, Australia

时 间：2013年9月11日（星期三）上午10：00 – 11：00

地 点：中山大学东校区北学院楼B219会议室

主持 人：孟凡刚 副教授

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　　In environmental engineering, carbon nanomaterials (CNMs) have been proposed as a basis for developing new technologies for nanomaterial-enabled photo-oxidation and disinfection, improved membrane processes, adsorbents, and biofilm-resistant surfaces. In detail, CNMs can be photoactivated to produce reactive oxygen species (ROS) such as singlet oxygen (1O2) and superoxide (O2?-) via type I and type II photosensitization pathways given appropriate suspension conditions in aqueous environments. Moreover, these ROS have been shown to impact MS2 bacteriophages by inactivating them at much higher rates than those found for irradiation alone.Recently, we explored the use of CNMs as the basis for a range of new technologies including, degradation of trace organic compound was selected for its sensitivity to degradation by singlet oxygen by in situ generation of ROS under ultraviolet (UV) irradiation, new strategies for bacterial inactivation, the inhibition of biofilm development, and reduced biofouling on a microfiltration membrane surface.

　　However, the ever-increasing use of these nanomaterials in commercial products and applications has raised concerns over the potential consequence of environmental and human exposure. Like many other engineered nanomaterials, CNMs tend to form colloidal aggregates in water. Given that some of these aggregates possess properties that differ from the pristine nanomaterials, an evaluation of the fate and impacts of CNMs in the aquatic environment requires an understanding of the effects of aggregate properties such as size, fractal structure and surface charges on transport of the nanoparticles, as well as their interactions with environmental elements such as soil, natural organic and inorganic substances, and biomass. For example, we reported that the production of ROS, microbial inactivation, and the mobility of the aggregates of fullerene(nC60) in a silicate porous medium all increased as the size of aggregatesdecreased. These size-dependent differences are attributed to an increasing degree of hydroxylation of nC60 aggregates with decreasing size. As the quantity and influence of these more reactive fractions may increase with time, experiments evaluating transport and toxicity endpoints of CNMs must take into account the evolution and heterogeneity of engineered nanoparticles.