美国康涅狄格大学韩怡博士生讲座，环境馆一楼大厅会议室改到三楼东会议室
发布日期：2015年05月05日 阅读： 次
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| 美国康涅狄格大学韩怡博士生讲座 题目及摘要：碳纳米材料的表面改性及其对水中微污染物的去除 ( Surface modified activated carbon nanofiber nonwoven as a high surface area sorbent for removal of micropollutants in water) A novel sorptive material, activated carbon nanofiber nonwoven (ACNFN) takes advantage of nanoscale fabrication to reduce mass transfer limitations while functionalizing the surface through chemical modification to target micropollutants. Comparison of ACNFN without chemical modification to granular activated carbon (GAC) has shown that despite the lower total surface area of ACNFN as prepared, the kinetics of PAH sorption is more rapid on ACNFN, with a pseudo-second order rate constant (µg g-1 h-1) that was approximately 10 times higher than that of GAC. The distribution coefficients of PAHs on ACNFN are at least double those on GAC. In efforts to find more effective ways of functionalizing ACNFN, we have focused on novel reactions that can optimize the balance of attaching targeted functional groups while limiting material degradation. For the initial modification to introduce carboxylic acids on the surface, we have assessed nitric acid, a mixture of nitric acid and sulfuric acid, and potassium permanganate as traditional oxidants. We also assessed novel oxidation pathways, including osmium tetroxide followed with potassium permanganate or oxone, and ruthenium tetroxide, both of which may be more specific in producing dicarboxylic acids on the surface. Subsequently, ethylenediamine (EDA) will be attached using coupling agents familiar to protein chemistry, which can form much stronger chelate interactions with metals. Current IR spectra and titration results show promise that target functional groups can be added to the surface of activated carbons via these mechanism. 时间：2015-05-07,下午15点-17点 讲座人：美国康涅狄格大学韩怡博士生 主持：曾光明教授 地点： 环境馆一楼大厅会议室改到三楼东会议室 参加人员： 有关研究生本科生自由参加 （投影仪等请晏铭老师帮助搞好） |
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