中文摘要：

阿特拉津是一种持久性含氯有机污染物,难以生物降解,因此有必要开发高效技术清除环境中残留的阿特拉津.近来纳米铁材料的发展为降解阿特拉津提供了一种可供选择的新方法,但降解过程中纳米铁活性逐渐减弱的问题仍需改进.本论文研究了铜离子（Cu^2＋）存在条件下Fe@Fe_2O_3纳米线活化分子氧降解阿特拉津的过程,并探讨了Cu^2＋的作用机理.研究结果表明,少量Cu^2＋的存在就可以显著促使Fe@Fe_2O_3生成溶解态Fe（Ⅱ）,从而有助于分子氧活化并产生更多·OH等活性氧物种.在降解过程中,阿特拉津首先被氧化,进而发生脱氯上羟基反应、侧链氧化以及脱侧链反应.

英文摘要：

As a persistent chlorinated organic pollutant, Atrazine （2-chloro-4-（ethylamino）-6-isopropylamino-s-triazine） in the environment brings harm to natural environment as well as the human health. Since Atrazine is difficult to be degraded biologically, various strategies have been developed to realize efficient and environmentally-friendly removal of Atrazine. Recently, nanoscaled iron has been extensively applied for the remediation/treatment ot＂ wastewater contaminated with vari- ous organic and inorganic pollutants and exhibits superior activity than that of bulk iron. But its rernoval efficiency would decrease along with reaction time. In this study, we report that copper ions could efficiently promote atrazine degradation with Fe@Fe2O3 nanowires via the molecular oxygen activation processes. As indicated by the electron spin resonance analy- sis （ESR） and X-ray photoelectron spectroscopic analysis （XPS） results, the addition of Cu2~ ions could promote the release of dissolved Fe（II） from Fe@Fe2O3. During the degradation process, the concentration of Fe（II） in the solution with Cu^2＋ions is maintained at a much higher level than that without Cu^2＋ ions. At the same time, Cu^2＋ ions were reduced to low valence states （Cu^2＋）, which further promoted the release of Fe^2＋. The generated Fe^2＋ would then activate the molecular oxygen via the single-electron or double-electron transfer route. As a result, more reactive oxygen species such as -OH were generated to degrade atrazine. Under room temperature and aerobic condition, the Atrazine removal rate constant in Fe@Fe203/Cu^2＋ sys- tem was 0.694 h^-1 which was almost 23 times that in Fe@Fe2O3 system. Moreover, the Fe@FezO3/Cu^2＋ catalytic system also remains superior activity in the pH range of 2~5. The intermediates of atrazine degradation were detected and the atrazine degradation in the Fe@Fe2O3/Cu^2＋ catalytic system was accompanied with alkylic oxidation, dealkylation and dechlorina- tion. This study provides a new